CN108768506A

CN108768506A - A kind of polynary multifrequency common-view mode time service method based on common thresholding

Info

Publication number: CN108768506A
Application number: CN201810303550.9A
Authority: CN
Inventors: 李忠文; 秦固平; 孟志才; 李霖; 宋木国; 刘甲春; 李忠梁
Original assignee: Sichuan Taifu Ground Compass Technology Co Ltd
Current assignee: Sichuan Taifu Ground Compass Technology Co Ltd
Priority date: 2018-04-08
Filing date: 2018-04-08
Publication date: 2018-11-06
Anticipated expiration: 2038-04-08
Also published as: CN108768506B

Abstract

The invention discloses a kind of polynary multifrequency common-view mode time service method based on common thresholding, using three or more optical routings routing is transmitted as the multiple temporal frequencies for participating in common-view mode, it is encoded come passing time frequency using the time interval of two or more frequencies, choose optical fiber O wave bands etc. time delays wavelength to transmitting to obtain from main website by static cross at the time of be used as common thresholding, the time service to slave station is realized by common-view mode.The star-like band-like polynary multifrequency of honeycomb is altogether regarding " common thresholding " than the availability of simultaneous techniques of comparison phase intelligence control locking phase realization and with a high credibility up to 99.99997% or more.

Description

A kind of polynary multifrequency common-view mode time service method based on common thresholding

Technical field

The invention belongs to accurate measurement, precision intelligence Phase-Locked Synchronous technical fields, are related to a kind of time service method, especially one Polynary multifrequency common-view mode time service method of the kind based on common thresholding.

Background technology

The sustainable development of information technology, the demand to time and frequency standards accuracy have been stepped up to picosecond, it would be highly desirable to be researched and developed High-precision Service of Timing builds high-precision time service network, will test indoor high-quality clock source and be nondestructively transmitted to a line node, National economy is served, high-precision basic guarantee is provided for all trades and professions.

For the physical features of optical fiber, the transmission of extremely slowly varying optical fiber is with the random noise of the parasitism such as temperature to light Fine length optical paths regard " common door altogether by the polynary of time interval reference signal fusing multifrequency of standardization, normalized landing During limit " compares, the actual transmissions distance that fiber lengths are L (x, y, z) is also to change at random, (more to describe herein to be：N The light transmission fiber routing length in certain two place of the geographical position coordinates in (x, y, z) certain place with L (x, y, z) is two endless Exactly the same concept), therefore be the technology for having to consider in ultra precise measurement and when ultraprecise control and when master-slave synchronisation Problem；But with extremely accurately Time and frequency standard (being better than 1E-15 or more) is random to measure the optical-fiber time-delay value of N km length Variation, single fiber bi-directional can reach and realize " ps grades " matching measurement time interval accuracy of measurement < 5ps.Research is also thinner than hair Optical fiber A → B distance N km (N=20~200) length the micro variation △ L of physics, its dimension be △ L/km. DEG C, it is With the one kind for the parasitic random noise variation for transmitting distance and temperature change, therefore the transmission of superhigh precision temporal frequency must be studied Optical fiber transmit extremely slowly varying rule, also can completely think all be time delay random noise variation+aging drift synthesis it is comprehensive Close result.Do not divide, remove, compress, filter out if random variable noise is accumulated in the drift of optical fiber transmission, ground time dissemination system The middle high-accuracy high-grade clock of main website just at all can not be by the true temporal frequency base for being better than 1E-16/ days~1E-17/ days Accurate stability and frequency accuracy is transmitted to the slave station in ad eundem clock interactive synchronization and the master-slave synchronisation other than > 2000km Clock node gets on, therefore the Time and frequency standard of the high-grade ultrahigh precision of true and false main website cannot be distinguished in local clock, so Realize the polynary application for comparing intelligence control locking phase regarding " common thresholding " altogether of the star-like band-like multifrequency of honeycomb, it could be 1E-16/ days superelevation The Time and frequency standard of precision is seamless, it is transparent, accurately, stablize, safe and reliable and healthy and strong be transmitted to > In node remote 2000km.

There is also dispersion-shifted accumulation, (dimension of abbe number is xps/nm.km, dispersion-shifted accumulation in optical fiber transmission Dimension is xps/nm2.km) negative effect be that the random variations of the frequency of light wave transmitted with optical fiber and fiber lengths generates, It, which is not extremely slowly changing for master clock source, must also divide, remove, compressing, filtering out.It is also to need to compensate and control , but optical fiber transmit property have many good qualities with wireless communication compared with, can remote measuring and controlling intelligent control method with Means realization is still easier, it is seen that and visual device is easier, and detection is measured and do not directly affected by weather etc., if The advantages that relatively low for cost.Therefore it makes full use of fiber resource and can be achieved on to transmit ultrahigh precision Time and frequency standard.

Using MRT main websites loopback+optical fiber " on-line monitoring " patented technology (《A kind of optical communication network optical fiber transmission delay On-line monitoring method》Number of patent application：201310384396 publication No.s：CN103441795A) optical fiber can be transmitted the time glistening light of waves It route a variety of random variable noise segmentations, the stripping of optical-fiber time-delay：This variety of random variable noise has stochastic temperature variation introducing The drift accumulation of the daily fluctuation moon, year drift accumulation (accumulates for positive drift from severe winter to summer, and is then negative drift from summer to severe winter Move accumulation) light transmission fiber routing dispersion-shifted accumulation ... wait the drift slope of introducings to be equivalent to 1E-13/ days~1E-16/ It, the variation of even higher slow drift.

Invention content

It is an object of the invention to overcome the above-mentioned prior art, a kind of polynary multifrequency based on common thresholding is provided Common-view mode time service method.

The purpose of the present invention is achieved through the following technical solutions：

This polynary multifrequency common-view mode time service method based on common thresholding, using three or more optical routings as ginseng It transmits and route with multiple temporal frequencies of common-view mode, encoded come passing time frequency using the time interval of two or more frequencies Rate, choose optical fiber O wave bands etc. time delays wavelength to transmitting to obtain from main website by static cross at the time of be used as common thresholding, The time service to slave station is realized by common-view mode.

Further, above to transmit the specific of routing as the multiple temporal frequencies for participating in common-view mode using three optical routings Scheme is：One optical routing transmits 1PPS+TOD, and two other optical routing is used for transmitting the frequency signal of identical frequency.

The frequency range for the frequency signal that above-mentioned two other optical routing transmits is 100Hz to 10kHz.

Further, above-mentioned static cross transmission is to transmit the moment using static wavelength crossed dispersion compensation method.

Further, upon transfer between frequency when, with intelligence control Phase Lock Technique come divide, remove, compress, filter out optical fiber transmission A variety of random variation parasitic noises make in the time delay value constant control to the range of tolerable variance allowed of optical fiber.

Further, above-mentioned static cross, which transmits, is：Light wave transmits inherent characteristic when being transmitted using optical fiber, G.652 in optical cable O wave bands zero dispersion center 1310nm both sides etc. time delays wavelength in same root optical fiber single fiber bi-directional transmission or simultaneously When static cross transmits, it is positive and negative differential variation each other all along that the abbe number slopes of two light waves is slowly varying with temperature Intrinsic regularity, realize that fibre-optical dispersion accumulates adaptive mend using the method that intelligence control Phase Lock Technique and static cross transmit It repays.

Further, the above time delay asymmetry difference by optical routing controls within 20ps~5ps ranges.

Further, three or more optical routings are transmitted while being compared simultaneously, and the adjacent clock or clock of local same level Group must also have three optical routing backs to be transmitted to main website, mutually compare, majority vote.

The invention has the advantages that：

Little deviation in (1) routing (or two routings) transmittance process is not easy to find, especially wirelessly communicate The Time and frequency standard reference information of transmission, who correctly whom degenerates, and differentiates very difficult.And the star-like band-like transmission of optical fiber honeycomb Polynary multifrequency is altogether one by power port dedicated hardware " chip " (or FPGA) than " the common thresholding " that mutually differentiates depending on " common thresholding " Etc. compositions a component (or unit plug-in card), polynary multiple input frequencies interface at least 16 tunnels altogether regard " common thresholding " compare, Therefore the availability for the simultaneous techniques that the star-like band-like polynary multifrequency of honeycomb is realized regarding " common thresholding " ratio comparison phase intelligence control locking phase altogether With with a high credibility up to 99.99997% or more.

Slow drift in (2) routing (or two routings) transmittance process is difficult segmentation stripping, in master-slave synchronisation In：Fiber lengths tire out with the extremely slow daily fluctuation of temperature, moon drift during optical fiber transmits, drift for many years is accumulated and dispersion-shifted is tired Product is all that two-dimentional second order changes at random, a grade grade generally lower than main website for slave station clock source, this when base ageing rate Greatly, can not divide stripping extremely slow random variable noise, and with honeycomb it is star-like it is band-like transmit+polynary multifrequency common-view mode, And the advantageous effects brought by main website MRT loopback detections are：

Main website is the random variable noise of the divisible stripping > 8.64ps/ days of eHPRTC；

Main website is the random variable noise of the divisible stripping > 86.4ps/ days of HPRTC；

Therefore system is transmitted with the level Four master-slave synchronisation optical fiber of eHPRTC → HPRTC → ePRTC → PRTC → LPRC → DCXO The transmission damage that the random variable noise that the one Time and frequency standard supporting network network platform avoids error tracking optical fiber intrinsic is brought, It is possible to obtain best synchronous effect

The uncertainty size that routing is transmitted in (3) routing (or two routings) transmittance process is powerlessly differentiated：

Oneself builds more than 3,000 ten thousand kilometers of optical cable in China, and G.652G.655 optical cable model, which has ... waits current G.652 optical cable Can relatively stablize, consistent performance also preferably accounts for 95%, each hop distance can not possibly be identical, therefore in transmittance process It is unexpected not know to be likely to occur at any time, then the star-like band-like polynary multifrequency of honeycomb is altogether strong differentiation depending on " common thresholding " comparison The key means of uncertainty；

After fibre system is switched in (4) routing (or two routing) transmittance process, time delay saltus step, switch after light Towpath by stabilization quality etc. can not differentiate.And the star-like band-like polynary multifrequency of honeycomb regards " common thresholding " and compares and just do not have to worry altogether The appearance of this this problem.

It is a hang-up that (5) routings (or two routings), which transmit all accidental interruption, " punctual ",.And honeycomb is star-like Band-like polynary multifrequency regards " common thresholding " and compares altogether, other than irresistible natural calamity (such as violent earthquake), keeps time and occurs Probability there's almost no.

(6) the star-like band-like polynary multifrequency of honeycomb is altogether that construction is seamless, transparent depending on " common thresholding " time service method, stablizes , one of accurate, safe and reliable and healthy and strong national unified time frequency reference the fiber support net network platform it is good Method

Description of the drawings

Fig. 1 passes for O 2 × 50km of wave band 1270nm in G.652 piece optical fiber of optical cable with 1350nm+ static cross optical routings Pass time delay value change schematic diagram；

Fig. 2 is that regular hexagon star topology cellular construction transmits optical-fiber network figure；

Fig. 3 is that star-like band-like polynary regard altogether " the prisoner's trap " of G652Nx2x50km honeycombs transmits network diagram；

Fig. 4 be poor group delay wavelength it is right+static cross long distance optic transmission information schematic diagram；

Fig. 5 is that G.652 2 × 50km+ of optical cable and optical fibres single fiber bi-directional 1270nm and 1350nm static cross multifrequencies are polynary to be regarded altogether " common thresholding " comparison matches transmission block diagram；

Fig. 6 is that star-like band-like single fiber bi-directional matching transmission polynary " the 5 normalizings " difference of multifrequency of < 5ps~10ps honeycombs is total Door " thresholding " compares intelligence control locking phase side cabinet figure.

Specific implementation mode

The present invention is based on the polynary multifrequency common-view mode time service methods of common thresholding, using three or more optical routing conducts The multiple temporal frequencies for participating in common-view mode transmit routing, are encoded come passing time frequency using the time interval of two or more frequencies Rate, choose optical fiber O wave bands etc. time delays wavelength to transmitting to obtain from main website by static cross at the time of be used as common thresholding, The time service to slave station is realized by common-view mode.

Use three optical routings as participate in common-view mode multiple temporal frequencies transmit routing concrete scheme for：One Optical routing transmits 1PPS+TOD, and two other optical routing is used for transmitting the frequency signal of identical frequency.The two other light The frequency range for routeing the frequency signal transmitted is 100Hz to 10kHz.Three or more optical routings are transmitted while being compared simultaneously, and And the adjacent clock or clock group of local same level must also have three optical routing backs to be transmitted to main website, mutually compare, it is most Judgement.

Between upon transfer when frequency, with intelligence control Phase Lock Technique come divide, remove, compress, filter out optical fiber transmission it is a variety of with Machine changes parasitic noise, makes in the time delay value constant control to the range of tolerable variance allowed of optical fiber.

Static cross transmission is to transmit the moment using static wavelength crossed dispersion compensation method.Static cross transmits： When being transmitted using optical fiber light wave transmit inherent characteristic, G.652 the both sides of the zero dispersion center 1310nm in optical cable etc. time delays wave Length is to the single fiber bi-directional transmission in same root optical fiber or when static cross transmits simultaneously, and the abbe number slope of two light waves is with temperature Spend it is slowly varying be all along positive and negative differential variation each other intrinsic regularity, utilize intelligence control Phase Lock Technique and static cross The method of transmission come realize fibre-optical dispersion accumulate adaptive equalization.

The time delay asymmetry difference of optical routing is controlled within 20ps~5ps ranges.

The present invention is described in further detail below in conjunction with the accompanying drawings：

Fig. 1 be etc. time delays wavelength it is right+the polynary difference of static cross multifrequency altogether regard " common thresholding " compare Transfer Technology signal Figure is as follows：

1350nm (50km)+1270nm (50km) is that one group of (2 × 50km)+1270nm (50km)+1350nm (50km) is Second group of (2+50km) ten ...

Explanation：G.652 Group Delay-Wavelength optical fiber light wave transmissions time delay-light wave λ i characteristics of optical cable Curve in the optical wavelength at 1310nm zero dispersions center there are：

Such as time delay value is essentially identical within the scope of 2 × 50km of 1270nm and 1350nm but has the dispersion-shifted of very little, and And chromatic dispersion gradient changing rule：One isThe other isStochastic difference variation noise, the dimension of abbe number For △ Dd/nm.km (the O wave bands of 1260nm~1360nm only centered on 1310nm just exist).Therefore in a single fiber Simultaneously with mutually transmit in vary with temperature to begin to eventually maintenance be differential variation rule transmission time-ofday signals；If 2 × 50km " 50km " measure " on-line monitoring " optical-fiber time-delay value servo lock from main website Tx → slave station Rx optical routing overall delay value MRT loopbacks And in the range of accurately controlling some permission, L (x, y, z)=Tao is reflected in when two " 50km " error in length values pass through After " 5ps " time interval resolution ratio (resolution) measurement≤± 1mm (< 5ps), when optical-fiber time-delay servo lock and precision When the extremely slowly varying random variable noise of six classes is divided, is removed, compressed, filtering out < 5ps by control technology, i.e. β λ 1270nm × L1+ β λ 1350nm × L2=+36ps+ (- 36ps) adaptive equalizations are to+5ps (or -5ps) and another optical fiber Optical routing be then：β λ 1270.00nm × L2+ β λ 1350.00nm × L1=(- 36ps)+(+36ps) adaptive equalization to- 5ps (or+5ps), thus using two optical fiber and convert etc. mono- group of time delays light wave wave λ from O → F → A be 1270nm and 1350nm 2 × 50km static cross compensation, another group then from O → B → A be 1350nm and 1270nm 2 × 50km static cross mend It repays, therefore it is also to follow what difference was transmitted to reach two groups of different static cross optical routings of A points from O → F → A and O → B → A Rule.With biography that is segmented, removing, compress, filter out this two groups of 2 × 50km of Txk codes pair after a variety of random variable noises It passs and is also due to the more small difference with Eo (t) for " zero " dot center to beginning to end that the inherent characteristic that optical fiber transmits is formed Variation intersects " zero passage " variation, in other words, as by Eo (t) " common thresholding " controls with the polynary difference of multifrequency in differential variation " common thresholding " point is regarded altogether compares that band-like transmission maintains within the scope of ± △ the xps of " common thresholding " center variation step by step by Eo (t), It is transmitted to other than 2000km by N × 2 × 50km.If not using the static cross of 2 × Nkm to convert transmits patented technology, pole Its slow small drift (mainly dispersion accumulation drift) is then the drift accumulated error of diverging.

As shown in being transmitted in the star-like banded topology framework of Fig. 2 honeycombs：It is that a regular hexagon star topology cellular construction passes Pass optical-fiber network figure, explanation：

EHPRTC " 0 grade of clock group "-assumes to be made of two " light clocks "+at least three or more fountain Cs atom clock architecture Referred to as " 0 grade of clock group " its time frequency stability and accuracy were known as eHPRTC standard time frequency reference sections better than 1E-16/ days Point；It is the Master of national " 0 grade " synchronization.The realization that the mutually synchronization that the whole nation " 0 grade " Master > 2000km optical fiber transmits compares, The safety of the accurate transparent stabilization of superhigh precision Time and frequency standard of two or more " 0 grade " Master must be solved first The healthy and strong technical barrier for being transmitted to opposite end.Patent of the present invention using honeycomb it is star-like it is band-like transmit polynary (multi-pass by) etc. whens Prolong light wave regard altogether " common thresholding " polynary to 2 × Nkm of difference static cross, tri- sequential transmission " 5 normalizings " multifrequency and compares intelligence control Locking phase+smooth balanced fine tuning delay compensation swings moment time master reference " thresholding compression " in " 0 " point " zero passage ", " thresholding " ± 40ps, ± 20ps, ± 10ps, ± 5ps totally four grades are set as, their time interval measurement resolution ratio point will be： 8ps、4ps、2ps、1ps。

G.652 the time delays light wave such as star-like band-like more members of transmission≤2000km of 2 × 50km of optical cable honeycombs regards difference " common altogether Thresholding " compares design scheme, overall block-diagram such as Fig. 3：

(1) " 01 " node be " 0 grade of clock group " node → 4 × 2 eHPRTC × node → 4 × 2 50km ← PRTC × 50km ← " 02 " eHPRTC of node → 8 × 2 PRTC × 50km ← " 0 grade of clock group "；

(2) it sets " 01 " node and " 02 " node all configures " 0 grade of clock group " clock group atomic clock equipment and is known as eHPRTC (eHPRTC temporal frequencies stability and accuracy 1E-16/ days), A3 and Ani configures PRTC time reference sections in 2000km distances The PRTC nodes of+two, the Cs atom clock rubidium atomic clock of point device two composition；

(3) the optical fiber single fiber bi-directional that each can use by oneself is transmitted to opposite end, select 1270nm and 1350nm or 1290nm with The reciprocity time delay light waves of 1330nm two press the star-like band-like transmission 1600km~2000km of Fig. 2；

(4) the optical fiber D-W curves of G.652 optical cable are pressed according to when in front optical module production technology CWDM：

1290nm1330nm and 1270nm1350nm has ± 3nm variations, the method that we are matched using appropriate matching, respectively Matching matches consistency improvement to the accuracy of opposite ± 1nm, such as：

1270nm ± 0.5nm matches pairing with 1350nm- (±) 0.5nm；

1271nm ± 0.5nm matches pairing with 1349nm- (±) 0.5nm；

1269nm ± 0.5nm matches pairing with 1351nm- (±) 0.5nm；

……

1264nm ± 0.5nm matches pairing with 1356nm- (±) 0.5nm；

1263nm ± 0.5nm matches pairing with 1357nm- (±) 0.5nm；

……

If above-mentioned requirements set up, etc. time delays light wave to time delay initially fix relative deviation theoretical estimated value be：

1270nm and 1350nm 50km (at 25 DEG C) △ Dmax are：

0.072ps/nm2.km × 1nm × 50km=3.6ps/nm

1290nm and 1330nm 50km (at 25 DEG C) △ Dmax are：

0.030ps/nm2.km × 1nm × 50km=1.5ps/nm

It may will increase 3 times if matching selection laser without matching and sending the light wave △ Dmax introduced, that is, transmit and make an uproar Sound degenerates 3 times.

(5) etc. time delays light wave it is right+static cross second-compressed reduces and transmits damaging techniques：

Three sequential steps are tested：

First step：It MRT main websites loopback+" on-line monitoring " optical-fiber time-delay servo lock and accurately controls, by " 0 grade of clock group " When 1E-16/ days superhigh precision Time and frequency standards make monitoring rate to reference signal, the optical fiber of optical cable is transmitted into the negative of introducing Face ring segmentation, stripping optical fiber transmit when temperature ... wait a variety of random variable noises, compress, filter out can reach ± 100ps~ Being effectively compressed of the random variable noise of ± 1ps especially aging drift accumulations >=8.64ps/ days, filtration result quality, will be direct The transmission effect of influence time frequency reference.Therefore the size of a variety of random noise dynamics abilities is filtered out, certainly in time interval point Distinguish the scale of measurement, the rank of " clock group " and segmentation, accurate dynamics stripping, compressed, filtered out.

Second step (sequential)：It is transmitted to " 02 " from " 01 " or is transmitted to the polynary difference of mutually synchronization multifrequency of " 01 " from " 02 " Point altogether regarding the technical difficulty focus of " common thresholding " comparison intelligence control locking phase be all lightwave circuit by the introducings such as dispersion-shifted light The compensation of the time delay asymmetry of glistening light of waves routing, and time delays light wave is waited although to have small transmission dispersion-shifted tired to delivery lag Product damage, but by the 2 × 25km, 2 × 50km or 2 × 100km of > 2000km, 1270nm and 1350nm or 1290nm with The dispersion accumulation that the OEO static cross of 1330nm transmits 5 common-view modes can firmly control after adaptive intelligence control compensation Within the scope of the technical indicator designed to us, such as：50km optical fiber single fibers bi-directional, which transmit, uses the time delays such as 1270nm and 1350nm 2 × 50km × 20=2000km after light wave filters out transmission+static cross compression, as long as Eo (t), which transmits damage, realizes < " ps Grade ", then other several subitems are then easier to control.If the static cross effect of 2 × 100km optical routings be 1 (such as≤ 40ps) the static cross effect compression that then the static cross effect of 2 × 50km is 0.5 (≤20ps) 2 × 25km be 4 times (≤ 10ps)。

Second step (sequential)：Superhigh precision frequency and phase discrimination " zero passage " detects master-slave synchronisation and regenerates superhigh precision UTC atoms Temporal frequency base reference signal.

The star-like band-like polynary difference of multifrequency of honeycomb is regarded into the invention of " common thresholding " comparison intelligence control Phase Lock Technique altogether and other are several Item patent of invention integrates the complex art effect that application obtains jointly：

Dispersion-shifted accumulates ≈ 0

Initial time transmission error ≈ 0

Optical routing cascades transmission error drift accumulation ≈ 0

Noise transmits transfer accumulation ≈ 0, and the intrinsic of itself for being solely dependent upon the slave station local clock of optical fiber transmission is made an uproar at random Sound, if the bis- constant temperature high stable SC of DCXO cut and realize that ultralow phase noise exports its short-term second stability up to 1E- 13/ second-time, its reversed attenuation > 125dB backgrounds phase noise≤- 163dB and long-term permanent operation will not all degenerate.

The star-like band-like polynary difference of multifrequency of honeycomb regards " common thresholding " and compares intelligence control locking phase Transfer Technology and optical fiber transmission altogether Lightwave spectrum is unrelated；

Distance is transmitted with optical fiber and cascade is unrelated；

It is unrelated with time t, it does not change with time and changes；

(6) the G.652 optical routing light wave asymmetry difference drift accumulation accumulation of optical cable and optical fibres 2000km：

DWDM：

O wave bands：1260nm~1360nm；

S-band：1450nm~1530nm；

C-band：1530nm~1560nm；

L-band：1565nm~1625nm；

Wherein 0 wave band currently only develops seldom several CWDM light waves, it is clear that the resource utilization of this light wave frequency range is very It is low, if also developing new " DWDM ", resource utilization can be expanded, " ps grades " only with 1~2 optical fiber, one G.652 optical cable also has very multifiber that the routing of the O band of light glistening lights of waves is only had 3 pairs using CWDM, it is clear that the utilization rate of fiber resource It is not high, and " DWDM " dense wave division multipurpose of O wave bands is developed, it should be opened certainly according to the intrinsic particularity of O wave band light waves It sends out development of new DWDM and the DWDM of the own exploitation of original C-band is slightly distinguished.

Unified time frequency reference fiber support net network platform backbone transport network uses the star-like band-like transfer frame of honeycomb Every optical cable only forms polynary transmission system therefore the unified time of " six into six go out " with two optical fiber in three optical cables of structure The security reliability of the frequency reference fiber support net network platform greatly improves, availability and with a high credibility up to 99.999996%, This is that foundation precise time service needs the fiber resource that occupies, but G.652 0 wave band 1260nm~1360nm light waves of optical cable in addition to Outside two optical fiber that the supporting network network platform occupies, other optical fiber is developed at new using split-second precision frequency reference The dense wave division multipurpose " DWDMo " (DWDM for being known as DWDMo and its all band is distinguished) of type, if selected between 1nm optical routings Every can then increase by 100 optical routings or 50 reciprocity time delay light waves to static cross property optical routing Transmission system to future Optical Transmission Network OTN network is made something perfect even more perfect.

G.652 optical cable occupies 95% in the construction of optical fiber transmission network network, makes full use of existing fiber resource, and successfully It is logical to transmit high-speed data that the dense wavelength division DWDMo of novel O wave bands 1260nm~1360nm is developed in independent innovation Communication service.Several wavelength-division transmission channels can be increased.

If the dense wavelength division lightwave spectrum interval > 160GHz at selection 1nm intervals, if using etc. time delays light wave right+2 × Nkm static cross transmits automatic adaptive compensating equalization dispersion accumulation drift 2000km distance≤5ps+ λ toi (1310nm) Time pilot tone by the optic fibre light path of every transmission of traffic information by the daily fluctuation varied with temperature, the moon drift and year drift with For the control of machine variable noise to≤5ps, 2 × Nkm=2000km transmission transmission 100Gbit/s~160Gbit/s is completely can be real It is existing

(7) it purifies and traces to the source：

" the 1 grade of clock group " that Cs atom clock tracing is traced to the source 1E-15/ days, can by self deterioration drift about 1/2D t2 from 8.64ns/ days, synchronized tracking compression filtered out 86.4ps/ days.

" the 0 grade of clock group " that Cs atom clock tracing is traced to the source 1E-16/ days, can be old from aging drift subitem 1/2Dt2 by body Change drift 8.64ns/ days, synchronized tracking compression filters out 8.64ps/ days range Inner.

But can the premise that traced to the source be：Can " 0 grade of clock group " 1E-16/ days superhigh precision Time and frequency standard accurate nothing The realization master-slave synchronisation being transmitted to other than 2000km with " 1 grade of clock group " accidentally.Zero distance " loose coupling " ultralow phase must also be installed additional Position noise purification, compressor reducer, make the proper phase noise of atomic time frequency references at different levels and short-term stability performance also reach " ps Grade ".The Time and frequency standard node of each class hierarchy must reach the ultralow phase noise being adapted with itself rank and export requirement.

In addition " 0 grade of clock group " also has drift (about 3ns/) that the benchmark to higher precision grade is needed to trace to the source, and can eliminate The polynary collaboration difference of multifrequency between this extremely slowly varying drift, or " 0 grade of clock group " in a region regards " altogether altogether Can same thresholding " transmit mutually synchronization and compare the opposite consistency that make them keep ultrahigh precision." 0 grade of clock group " is also required to look for 1E-17/ days~1E-18/ days super its accurately Time and frequency standard with reference to compare trace to the source.

(8) unified time frequency reference " cloud " the supporting network network platform：

Use the star-like ribbon fiber supporting network network platform of honeycomb as highest level clock using national time service center and Pekinese Group (referred to as " 0 grade of clock group " eHPRTC nodes) realizes that the polynary collaboration difference of mutually synchronization multifrequency regards " common thresholding " and compares intelligence altogether Control locking phase, can be used Beijing → ← Shijiazhuang → ← Taiyuan → ← Xi'an the entire process have about 1600km the star-like band-like multifrequency of honeycomb it is polynary It cooperates with difference to regard " common thresholding " altogether and compares the transmission of intelligence control locking phase, realize " ps grades " mutually synchronization first.With five regions center (+ Five strategic standby nodes) it is " 0 grade of clock group " that " 1 grade of clock group " HPRTC nodes build level-one whole nation backbone transport network 1E-16/ days star-like band-like polynary collaboration difference of transmission mutually synchronization multifrequency of honeycomb regard altogether " common thresholding " comparison intelligence control locking phase as Two highest level clock sources of < 5ps (RMS) are primary and backup unified time frequency reference fiber support net net network section Dian Construction be the infrastructure to be built at first.

The availability that one light transmits routing is 85%, and not available probability is 15%, if transmitting road using two light It is then 97.75% by the availability of (main+standby), the availability that three light transmit routing is：99.6625%.Six into availability It is 99.999996%, if main website (Time and frequency standard of " 0 grade of clock group ") uses the present invention to " 0 grade in being transmitted at " ps grades " Mutually synchronization multifrequency that two groups of three optical routings of clock group " and another " the 0 grade of clock group " of 2000km are realized is polynary to cooperate with difference to regard altogether " common thresholding " comparison intelligence control locking phase+transmitted using the star-like band-like 2 × 50km of static cross of honeycomb × 20=2000km.When each Between the availability of frequency reference node be better than 99.999996%.Therefore fiber support net network cloud platform as is substantially Without the concern for " punctual " this requirement

The precision of the Time and frequency standard node of the present invention is very high, graduation " O&M automation " management：

(A) " O&M automation " management of " O grades of clock groups "：Only to " the 1 grade of clock group " of five regions (including spare " 1 grade of clock Group " HPRTC Jie Dian) carry out monitoring remote measuring and controlling return；

(B) " O&M automation " management of " 1 grade of clock group "：The PRTC nodes each province and city PRTC nodes that the areas Zhi Duiben great are " O&M automation " management：Monitoring remote measuring and controlling only is realized to the LPRTC nodes of this provinces and cities；

(C) " O&M automation " management of prefectures and cities LPRTC nodes：Only to the county center of this districts and cities range Inner and part weight Terminal " user " is wanted to realize monitoring remote measuring and controlling；

The main matter content of graduation " O&M automation " management：

(A) slave station clock returns to itself corresponding main website and actively discovers function check verification；

(B) marginal performance (thresholding) alarm of important component (component)；

(C) critical failure event automatically generates the function of printing " O&M " work order；

HPRTC " 1 grade of clock group "-assumes to form referred to as " 1 grade of clock by+three Cs atom clock architectures of two hydrogen atom clocks Its time frequency accuracy of group " and stability are known as HPRTC standard time frequency reference nodes in 15/ day better than 1E-；It is the whole nation The Regional Center of " 0 grade " backbone network is slave station (Slave) node of national " 0 grade of clock group ", but is its place again simultaneously Regional Center Master nodes.How the Time and frequency standard of superhigh precision is accurately transmitted to (the caesium of great Qu Atomic clock) PRTC nodes？

The Time and frequency standard node that PRTC-is formed with+two rubidium clocks of two Cs atom clocks (is the Slave of " 1 grade " It is the Master of " 2 grades " temporal frequency again).It is generally located on province center, traces HPRTC automatically.

(Slave for being " 2 grades " backbone network is " 3 grades " again to the Time and frequency standard node of two rubidium clocks of LPRTC-composition The Master nodes of synchronous net)；It is generally located on districts and cities' level centers.

DCXO RTC-county's Centroid are respectively synchronized with corresponding districts and cities LPRTC nodes

﹡ sets A, B, C, D, E, F+O (Centroid)；

﹡ sets the highest clock group of O node clock node grade, and the slave station clock node of A, B, C, D, E, F are lower than the stations A The clock of one grade；

﹡ sets the light biography of O → A, O → B, A → B, O → C, B → C, O → D, C → D, O → E, D → E, O → F, E → F, F → A Losing routing 50km and all control is that (or it is T2.0K codes i.e. 2kHz=to be set as Txk codes nominal value for identical (virtual) time delay value 500000.000ns) random noise changes < 5ps/ days, i.e., arrives length distance control errors：< 1mm.(< 5ps)

﹡ assumes that the frequency stability of clock main website (HPRTC clocks group) and accuracy are 1E-15/ days, is selected from O1 main websites The time delays optical wavelength pair such as 1330nm and 1290nm simultaneously with mutually transmitting Time and frequency standard to slave station A1 in normally transmission, due to Two light waves are transmitted to 0 → A in the same initial time of same root optical fiber with the same optical routing.According to the intrinsic spy of optical transport light wave The delivery lag value Toa of O → A of property 1330nm is Ttoa+ △ D, and 1290nm is then Ttoa- △ D

﹡ is by the 1270nm and 1350nm or 1330nm and 1290nm static cross that O → B → A and O → E → A is 2 × 50km Transmission is that the chromatic dispersion gradient error of two light waves regards the polynary difference of multifrequency " common thresholding " comparison intelligence control locking phase altogether, since static state is handed over The chromatic dispersion gradient error accumulation of 2 × 50km after forkIt is very small, theoretical calculation, when for <+2ps, then another way must all the way Surely it is < -2ps.And when optical routing is matched and is transmitted when the time delay random drift variation of the inherent characteristic generation of light wave transmissions Prolong transfer law to cause to begin to cause to transmit in a differential manner eventually, therefore rising edge is referred to as optical routing using main station time frequency reference COPY Eo (t) two light waves λ 1270nm and λ 1350nm or λ_1290nmWith λ_1330nmActual conditions are selected：

Etc. time delays light wave matching pairing transmission+static cross is compensated, even whens being exactly so-called equal by Different lightwave Prolonging light wave between them still has small difference, due to the abbe number and chromatic dispersion gradient of the time delays wave such as when temperature is slowly varying Mutual inverse variation 2 × 50km ranges Inner can the adaptive equalization in transmittance process, therefore 2000km transmits dispersion drift Move accumulation adaptive equalization compensation.

(1) definition of " loose coupling " intelligence control locking phase：One equivalent 3dB of important technology index of PLL and DPLL phase-locked loops Noise bandwidth：The soft of the equivalent 3dB noise bandwidths intelligent optimization of intelligent alterable is designed under the 0.9ps time interval scale of measurement Part realizes that frequency and phase discrimination " zero passage " detects and can get preferable relative frequency benchmark accuracy, but PLL is unable to the cascade of ring set ring, DPLL zero distance intelligence control locking phases can get excellent synchronous effect.

It is one of the technical measures for improving accurate intelligence control Phase Lock Technique

(1E-16/ days) of ultrastability and accuracy can be selected 1PPS, that is, comparison per second and once observe and measure the time 10000 seconds

And DCXO and VCXO can be selected 100PPS (100Hz) observe and measure the time be 100 seconds~1000PPS (1KHz) see It is 10 seconds or longer to examine time of measuring.

Selection principle is as follows in a word：

In formulaIt is every 10 seconds to 10000 seconds to observe and measure cycle times；

It is the cumulative measure for measuring 10000 NPPS signals.

It is T0.1k codes that 100PPS time intervals unify the Txk codes of dimension with 100HZ and 10.000000000ms threes.

Embodiment：

The star-like band-like core for transmitting the compensation transmission of 2 × 50km static cross of single fiber bi-directional honeycomb is the determination of Txk codes, Txk codes are every optical routings of every 1600km~2000km optical fiber in L (x, y, z) T (t) and the unified dimension of T (f) threes The amplitude of oscillation performance that transmission stability and drift are accumulated accurately controls, G.652 fiber selection 1270nm and 1350nm or 1290nm It is compared with the polynary difference of multifrequency common " thresholding " of 2 × 50km of the time delays light wave pair such as 1330nm, is exactly when being transmitted using optical fiber The slope variation of positive negative dispersion coefficient formed and begin to cause with the causes of 1310nm zero dispersion central points to be that difference rule is transmitted eventually, N × 2 The transmission 1600km of the polynary difference of multifrequency of × 50km common " thresholding " comparison intelligence control locking phase calibration guarantee Eo (t) " ps grades "~ 2000km。

So-called " thresholding " be exactly " with Tao1 and second optical fiber 1350nm of O → F → A (2 × 50km) of 1350nm with O1 → B of 1270nm → A (2 × 50km) Tao2+ thirds root optical fiber O1 → A1 1290nm and the bis- light waves of 1330nm in the same direction 2 × 2 Losing lock " controls thresholding, is that Eo (t) is made all to land all the time in the 1/2 of TiE (t) max that difference regards altogether and TiE (t) min Heart point is nearby the both sides of the thresholding of " common thresholding ", is exactly that the time delays light waves such as two are passed by first optical fiber 1270nm5km It passs, this moment A1 point has two groups of difference to compare a little totally four " thresholding " thresholding central point Eo1 (t) and Eo2 of pick-up point two jointly (t), weight decisions and according to majority are cooperateed with, intelligent optimization algorithm calibrates Eo (t) original moment point, due to four polynary differences of multifrequency Divide and regard " common thresholding " comparison point altogether and handled by intelligent optimization, laboratory, which is walked back and forth, really measures < " ps grades " so theory calculates It should be：1/2 " ps grades " central point.Such as it can by the Time and frequency standard of the 1E-16/ days ultrahigh precisions of Xi'an " 0 grade of clock group " It is accurately transmitted to Beijing and realizes that mutually synchronization of the polynary difference altogether regarding " common thresholding " compares with Beijing " 0 grade of clock group ". It is exactly how the Time and frequency standard of the superhigh precision for solving Xi'an " O grades of clock groups " " zooms out " 50km and desynchronize one in real value The output of DCXO ultralow phase noises also and the just the same effect of technology of " zero " distance DCXO " loose coupling " master-slave synchronisation, that is, Be 2 × 25km O → B → A from the star-like band-like O → A1 step by step of honeycomb and 0 → F → A be 2 × 50km select 1270nm with 1350nm and 1350nm and 1270nm reaches A nodes (DCXO) and shares three optical routings：

The temperature change drift for setting the side garden 50km centered on 0 point is+2 DEG C/days, then the drift of this days of 50km1350nm Value is 2 DEG C × 50km × (+) 3.07ps/nm.km. DEG C=+ 307ps/nm and the drift of this days of 1270nm accumulation is -3.07ps/ The error of two light waves of nm.km × 2 DEG C × 50km=-307ps/nm depends on drawing with the relative deviation of nominal light wave for two light waves The error entered

Bee is also equally passed through by two couples of 1270nm of three optical fiber and 1350nm/1330nm and 1290nm from Beijing → Xi'an The polynary difference of the star-like band-like transmission multifrequency of nest common " thresholding " compares, and it is mutually same that Eo (t) is passed to the realization of Xi'an country time service center Step.If condition is filled, can also to increase Beijing → ← Beijing-Kowloon Railway Line Xinxiang → ← Zhengzhou → star-like band-like multifrequency of ← Xi'an honeycomb perhaps polynary Difference regards " common thresholding " and compares altogether, just more ensures that the Time and frequency standard accurate stable of " 0 grade of clock group " ultrahigh precision is errorless High-grade time precision transmit.

Xi'an → 8 × 2 × 50km ← Taiyuan → 4 × 2 × 50km ← stone man pressure → 4 × 2 × 50km ← Beijing honeycomb is star-like The polynary difference of ribbon fiber multifrequency common " thresholding " compares intelligence control locking phase

Centered on 5.1G.652 optical cable zero dispersions 1310nm etc. time delays light wave (such as 1290nm and 1330nm or 1270nm and 1350nm) the light wave equity time delay transmitted transmits the polynary difference of multifrequency and regards " common thresholding " altogether and compare intelligence control locking phase+2 × 50km static cross optical routings match transfer mode, intelligence control Phase Lock Technique, uniformity：The Unified Characterization at moment and frequency cycle Technical indicator is：

The synchronization accuracy of 1GHz-100MHz-10MHz；

The unified timing synchronization of 100MHz-10MHz -1Hz；

Accurate T xk code multifrequencies are polynary special regarding " common thresholding " comparison phase demodulation altogether at the time of 10000PPS -100PPS -1PPS It is designed with chip；

Interval code stream when unified Txk codes are a normalized, standardized time, if being equivalent to the P codes of GPS etc. When (50PPS or 100PPS), then the mark mark time delay value length of optical fiber is up to 3000km.

50km nominal values are not that the actual value T4.0k of the A → ← two places B fiber lengths requires the corresponding light of nominal value of design Fine length is 51.06762487km (respective optical path by time delay value be 250.000000 μ s) 4.0KHz code nominal values Interval error (TID-Time lnterval Deviation) < xps, that is, time time when the 4000.000000000Hz times The phase is 250.000000 μ s every other week

Why uniformly making matching measurement uniformly with unified T (t) T (f) of Txk codes and L (x, y, z) three keeps common-view mode smart Degree uniformly makes temporal frequency light wave COPY three unified consistent, therefore only controls monitoring school optical fiber L (x, y, z) by a dimension (xps/km. DEG C of the coefficient dimension that fiber lengths vary with temperature) is constant to be terminated from the starting that Tx → Rxx is optical routing with as follows Multiple combinations transmit 2000km~20000km or more, also can uniformly select the i.e. M × 2 × 50km of some Txk code such as 2 × 50km =2000km~20000km or below 2 × Nkm of a variety of distances

The 2000km flexibly formed is waited in N=20,25,32,40,50,64,80,100,160,200 ... in M × 2 × Nkm The optical fiber of~20000km transmits network.

As long as 2 × Nkm such as A, B are the optical fiber of the Liang Ge districts and cities rank city optical routing of certain in L=2 × Nkm=2Txk M Centre 1/2 about 45km or so then may be selected in actual length distance about 90km, and then nominal length is set as 2 × 50km, L (x, y, z) 250.000000 μ s of=Txk code 4.000000000000kHz periods.

2 × 2 × 50km, 4 × 2 × 50km, 8 × 2 × 50km ... the advantages of ideal design of M × 2 × 50km is Standardization, it is normalized unanimously be a Txk code, then O&M automation realization it is simpler, O&M cost is low, and maintenance work is very square Just.

G.652 why the optical routing of optical cable and optical fibres selects 2 × 50km patterns without selecting 2 × 100km

When 1 DEG C of the temperature change of the optical routing of one 50km optical repeater Rms drift pendulum values if it is：774ps is again assumed that The temperature change of 1000km fibre circuits is essentially all uniform, then according to 50km × 20 optical repeater 1000km optical cables The corresponding peaks Rms drift pendulum ∑ б i2=20 × 774ps=15.48ns-peak day drift pendulum that 1 DEG C of circuit is 22 × 15.48ns of √ ≈ 44ns.LD devices be about 0.17ns drift pendulum (Rms be σ 0.054ns) this be the drift pendulum pendulum varied with temperature that single light wave transmits Width.Six kinds of random changes that MRT main websites loopback " on-line monitoring " optical-fiber time-delay servo lock and precision Control Technology transmit optical fiber It is as follows to change the effect that drift integrated noise is divided, removes, compressing, filtering out：

" 0 grade of clock group " 1E-16/ days national backbone, which transmit when the star-like band-like polynary collaboration difference of honeycomb is treated as altogether, compares lock Phase technical indicator：

" 1 grade of clock group " 1E-15/ days master-slave synchronisation effect：± 5E-16/ days；

The master-slave synchronisation effect of province center PRTC：± 1E-15/ days；

The master-slave synchronisation effect of ground downtown LPRC：± 5E-15/ days；

5.2 equally in G.653 optical cable transmission centered on zero dispersion 1550.12nm etc. time delays light wave to for example λ_1552.12nmWith λ_1548.11nmLight wave to the polynary difference of multifrequency altogether regard " common thresholding " compare λ_1552.12nmWith λ_1548.91nmWith λ_1552.93nmWith λ_1548.11nm... it waits also with time delays light waves such as the mirror symmetries on fiber zero dispersion center both sides in transmission The automatic compensation of the inherent characteristic of optical fiber transmission is 0.9ps/nm.km according to the abbe number value of zero dispersion central point G.653 The then chromatic dispersion gradient on central point both sides, if with G.652 identical, the effect that DWDM is transmitted is more preferable.

5.3G.655 non-zero dispersions, dispersion center it is movable (such as using 1510nm as the 1520nm at zero dispersion center with 1500nm) etc. time delays light wave to the polynary difference of multifrequency altogether regard " common thresholding " compare intelligence control locking phase to it is G.652 substantially similar. But the two optical transmission performance is different, therefore intelligence prosecutor method some differences.

5.4G.652 optical cable and optical fibres S, C, the poor wave of L-band are also common with the polynary difference of multifrequency to the static cross of group The segmentation of " thresholding " comparison intelligence control locking phase, stripping, compression, filtering function.It can refer to front to implement, but whens effect is than 0 wave band etc. Prolong light wave and poor is wanted to transmission.The effect filtered out is also not good enough.

5.5 eliminate and compress optical routing Tx → Rx and return to Tx → Rx mismatch transmission errors, and it is asymmetric poor to reduce these The one of the technology that the polynary collaboration of " zero passage " detection multifrequency of method Txk code < 100ps~5ps of value is compared regarding " common thresholding " altogether A important link

The polynary difference of the star-like band-like transmission optical fiber multifrequency of 5.6 laboratory simulations honeycombs regards " common thresholding " and compares intelligence control lock altogether Phase " ps grades " synchronization accuracy experimental demonstration is verified：The size that random noise occurs is mainly by optical fiber

5.6.1 the star-like time delays single fiber bi-directional difference such as band-like of 4 × 2 × 50km of laboratory simulations or 8 × 2 × 100km regards altogether " common thresholding ", which compares, transmits experiment；

5.6.2 the star-like time delays single fiber such as band-like of Beijing → 2 × 2 × 50km ← Baoding → 2 × 2 × 50km ← stone man pressure honeycomb The polynary difference of bidirectional multi-frequency regards " common thresholding " and compares transmission demonstration project construction altogether；

The polynary difference of time delays multifrequency such as the star-like ribbon fiber single fiber bi-directional of 8 × 2 × 50km laboratory simulations honeycombs regard " altogether altogether Same thresholding " compares intelligence control locking phase experimental verification and Xi'an → Taiyuan demonstration project experimental verification；

5.6.4eHPRTC → ← PRTC → ← PRTC → star-like ribbon fiber single fiber bi-directional of ← eHPRTC mutually synchronization honeycombs is more Frequently polynary difference regards " common thresholding " and compares intelligence control locking phase demonstration project experiment construction altogether；

The beneficial economic and technical effect of the present invention：

(1) Time and frequency standard of " ps grades "：

The star-like ribbon fiber of honeycomb transmits the polynary difference of multifrequency and regards " common thresholding " comparison accurate time transmission technology (method) altogether The purpose of invention：

It is (to miss in 1E-16/ days of O points " O grades of clock groups " split-second precision frequency reference source with UTC Time comparisons first Difference is put aside) place other than the accurate 2000km by >.

(2) " ps grades " biography maximum difficulty be optical fiber transmission multinomial random variable noise negative effect, with MRT+ Servo lock and the accurate control technique reinforcement of " on-line monitoring " optical-fiber time-delay are divided, remove, compressing, filtering out multinomial random variation Noise is translated into " ps grades " the normal distyribution function noise profile rule and most critical technology of " stationary random process " One of

(3) etc. time delays light wave it is right+the star-like ribbon fiber single fiber bi-directional multifrequency of static cross (2 × 50km or other) honeycomb is more First difference common " thresholding " compare adaptive dispersion drift accumulation isostatic compensation, compress, filter out after the double groups of optical routing cause to begin to cause Whole difference altogether regard " common thresholding " compare realization 1E-16/ days be the two of Eo (t) < 5ps key technologies.

(4) the Time and frequency standard exactness and stability of Liang Ge main websites " 0 grade of clock group " are 1E-16/ days, are transmitted to other side Be realize three optical routing mutually synchronization of " ps grade " compare with it is main → from the star-like striped transparent of synchronous honeycomb, stable, accurately , safe and healthy and strong transmission " 1 grade of clock group " Time and frequency standard node, realize that it is crucial skill to be compared when difference is treated as altogether The three of art.

(5) the random variable noise that optical fiber varies with temperature be the key that superhigh precision Time and frequency standard transmission error because Element.Light wave also has various other random variable noises and drift to accumulate in transmitting in a fiber, also precision is needed to control optical fiber A variety of random variable noises.Therefore when optical fiber transmit extremely accurately temporal frequency when, it is necessary to thoroughly segmentation, Stripping from, compression, Filter out a variety of random variable noises that optical fiber transmission generates.

(6) develop ultraprecise " timestamp " possess independent intellectual property right special chip can be key technology it Four.

(7) transmission of " ps grades " optical fiber matches mating ultraprecise tail optical fiber product and ultralow phase noise output system guarantee is not drawn Enter to increase the random variable noises of φ (t).

(8) third step is can be divided into the completion of two steps：First by zero distance " loose coupling " intelligence control locking phase≤± 500ps~± Then the implementation method of the multi-stage cascade of " ns grades sub- " simultaneous techniques of 200ps completes " ps grades " synchronizations again；

Such as：The laboratory of 4 × 2 × 50km≤± 200ps is walked back and forth true confirmatory experiment：

The star-like band-like polynary difference of multifrequency of 4 × 2 × 50km optical fiber 1270nm and 1350nm light wave single fiber bi-directional honeycombs regards altogether " common thresholding ", which compares, transmits true measurement experiment verification of walking back and forth；

4 × 2 × 50km 1270nm and 1350nm and 1330nm and 1290nm transmits laboratory simulations measurement experiment in the same direction：

M1 × 2 × 50km and the star-like band-like difference of M2 × 2 × 100km honeycombs are transmitted polynary " multiple spot normalizing " and are regarded altogether " jointly The experimental verification of the realization of thresholding " comparison technology.

When MRT main websites loopback+" on-line monitoring "+optical-fiber time-delay servo locking phase and accurately controlling make the Tx of every optical fiber → The 100km optical-fiber time-delays value of 2 × 100km, that is, L (x, y, z) distance after the true delivery lag value of Rx Txk code standardized nominals (being regarded as the virtual validation value Tao of the unified Txk codes of a three), time interval period (Tao), after 10MHz synchronization frequency divisions 10KHz~1Hz corresponding period (Tao) is just the same, i.e., characterizes three, the precision of one dimension of intelligence control with a variation function Also the control to three random variable noises is just realized, therefore such as using the star-like band-like transmission of " clock group " honeycomb of superelevation accuracy Shown in Fig. 1：

(a) setting HPRTC is " 1 grade " atomic clock clock group (1E-15/ days frequency stabilities and accuracy) MRT master Loopback " the on-line monitoring "+optical-fiber time-delay servo lock and accurately controlling of standing can reach≤86.4ps/ days

(b) PRTC is traced high-grade " 1 grade of clock group " automatically, a variety of random variations for the optical routing that segmentation stripping light transmits The filtration result of noise and " 1 grade of clock group " are essentially identical；

(c) two Cs atom clock independent operatings of PRTC or overhead satellites navigation system and other patterns are received to obtain Aerial Time and frequency standard, most ideal synchronisation effect are ± (5-1) E-14/ days, and much less, Cs atom clock is certainly for secure context The stability of body and the raising of accuracy are limited, then it divides the filtration result of the stripping random variable noise of optical-fiber time-delay far not Such as (b)

(d) obviously to realize that the synchronous effect of the < 50ps/ days of superhigh precision temporal frequency must be set up unified time frequency Rate reference optical fiber supporting network platform regards the polynary difference of multifrequency " common thresholding " with the star-like time delays light wave such as band-like of honeycomb and compares altogether To realize it is a kind of good method to intelligence control Phase Lock Technique.

It is successfully realized using MRT main websites loopback+" on-line monitoring "+optical-fiber time-delay servo lock and precision Control Technology By at the time of timing tracking accuracy drift about the amplitude of oscillation firmly control ± 10ns~± 5ns~± 2.5ns~± 1.5ns~± 100ps~± 20ps, we set realization in noise using time delays light wave common comparison Chuan Di Installed polynary to difference multifrequency such as optical fiber After flooding lower intelligence control locking phase compression filtering technology application, 0 point of " zero passage " that " pendulum " is equivalent in transmittance process of Es (t) ≈ Point, it is exactly virtual image Es (t) " 0 " point in fact, i.e., Es (t)=0 (landing calibration zero) is swung along > 2000km difference Principle be objective reality, here it is " 0 " of Es (t) point swing principle, as long as accurately controlling the amplitude of oscillation pair with intelligence control technology Title property, make timing tracking accuracy further reach ± 1ns~± 500ps~± 100ps~± 25ps~± 5ps be completely can be with It realizes.

(9) further study different optical cables for example G.653~G.657 in light wave transmit distinctive intrinsic physical characteristic, This patent is found to use into after entering or being improved, also realizes " ps grades " synchronizations.

Tracking and the time for precisely receiving " the most stable of astronomy clock in nature " of " pulsar " better than 1E-18/ days The tracing comparison technology in frequency reference source.

Under the enlightenment that optical routing transmits, exist in the celestial body of universe " most stable of in nature better than 1E-18/ days This astronomical clock of astronomical clock " is exactly " pulsar ", and pulsar is exactly a kind of remains of dead fixed star in fact, its density is every Cubic centimetre quality is up to 1,000,000,000 tons, while it is again with thousands of autorotations per second, according to " gyro principle "：Great matter Amount and high rotating speed are hereby it is ensured that pulsar has extremely stable periodicity, and stability is than the hydrogen atom in the world today High 10000 times of clock reaches 30,000,000,000 years not poor 1E-18/ days 1 second stabilitys.

Since the earth has atmosphere and the ionosphere of about 1000km, damage is transmitted when ground surface receives and compares greatly, together It is limited to walk effect.If if installed on the geostationary orbit of sky 35000km or in Big Dipper forth generation navigation satellite on earth Dry is realized that optic communication Tong Bu And receive " gyro " rotation of rotation 1E-18/ days of " pulsar " simultaneously in space vacuum Txk code Time and frequency standard reference signals and " pulsar " navigational satellite system for comparing of mutually synchronization, in this navigation satellite Hydrogen atomic clock and cesium-beam atomic clock can realize the synchronous effect transmitted with the vacuum of pulsar greatly be higher than tellurian What " clock group ".Also higher than the GNSS system of current air.

If aerial GPS/GLONASS/BDS (Big Dipper) etc. all in space vacuum with " pulsar " navigational satellite system Realization master → also regard " common door altogether in real time after polynary multifrequency difference is synchronized depending on " common thresholding comparison " altogether, and with adjacent asterisk Limit " compares (Inspection verification) to realize frequency stability and the accuracy better than 1E-18/ days, and clock correction timing synchronization≤ It will be possibly realized within ± 50ps/ days.

Claims

1. a kind of polynary multifrequency common-view mode time service method based on common thresholding, which is characterized in that use three or more light It route and transmits routing as the multiple temporal frequencies for participating in common-view mode, encoded using the time interval of two or more frequencies to pass Pass temporal frequency, choose optical fiber O wave bands etc. time delays wavelength be used as to transmitting the at the time of of obtaining from main website by static cross Common thresholding realizes the time service to slave station by common-view mode.

2. the polynary multifrequency common-view mode time service method according to claim 1 based on common thresholding, which is characterized in that adopt The multiple temporal frequencies for using three optical routings as participation common-view mode transmit the concrete scheme routeing：One optical routing transmits 1PPS+TOD, two other optical routing are used for transmitting the frequency signal of identical frequency.

3. the polynary multifrequency common-view mode time service method according to claim 2 based on common thresholding, which is characterized in that institute The frequency range for stating the frequency signal of two other optical routing transmission is 100Hz to 10kHz.

4. the polynary multifrequency common-view mode time service method according to claim 1 based on common thresholding, which is characterized in that institute It is to transmit the moment using the static wavelength crossed dispersion compensation method of O wave bands to state static cross transmission.

5. the polynary multifrequency common-view mode time service method according to claim 1 based on common thresholding, which is characterized in that when It is parasitic come a variety of random variations for dividing, removing, compress, filter out optical fiber transmission with intelligence control Phase Lock Technique when passing time frequency Noise makes in the time delay value constant control to the range of tolerable variance allowed of optical fiber.

6. the polynary multifrequency common-view mode time service method according to claim 1 based on common thresholding, which is characterized in that institute Stating static cross transmission is：Light wave transmits inherent characteristic when being transmitted using optical fiber, G.652 the zero dispersion center 1310nm in optical cable Both sides etc. time delays wavelength to the single fiber bi-directional transmission in same root optical fiber or when static cross transmits simultaneously, two light waves Abbe number slope with temperature it is slowly varying be all along positive and negative differential variation each other intrinsic regularity, utilize intelligence control lock The method that phase technology and static cross transmit realizes that fibre-optical dispersion accumulates adaptive equalization.

7. the polynary multifrequency common-view mode time service method according to claim 1 based on common thresholding, which is characterized in that will The time delay asymmetry difference of optical routing controls within 20ps~5ps ranges.

8. the polynary multifrequency common-view mode time service method according to claim 1 based on common thresholding, which is characterized in that three The above optical routing of item is transmitted while being compared simultaneously, and the adjacent clock of local same level or clock group must also have three light paths Main website is transmitted to by back, is mutually compared, majority vote.