CN102299745B - Dispersion adjusting method and device - Google Patents
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Abstract
The invention provides a dispersion adjusting method and device, wherein the method comprises the following steps that: the dispersion adjusting device finds a first candidate value, wherein the first candidate value is a measurement value obtained through measuring input dispersion of a DWDM (Dense Wavelength Division Multiplexing) system; when the first candidate value is found, the dispersion adjusting device takes the first candidate value as an input dispersion value; the dispersion adjusting device calculates according to the input dispersion value and a predetermined target dispersion value to obtain a dispersion adjusting value; and the dispersion adjusting device carries out dispersion adjustment on the DWDM system according to the dispersion adjusting value. In the invention, the input dispersion value is directly selected for dispersion adjustment. Compared with the traditional sequential test method for finding dispersion adjusting approximate values according to a fixed program, the method provided by the invention has the advantages of effectively shortening the dispersion adjusting time, increasing the new service creating and protection switch speed and avoiding long-term service interruption; and in addition, no person is needed to participate in setting the whole process, and dispersion adjustment can be automatically carried out.
Description
Technical field
The present invention relates to a kind of dispersion adjusting method and device, belong to technical field of optical fiber communication.
Background technology
Dense wave division multipurpose (Dense Wave-length Division Multiplexing, be called for short: DWDM) technology is a kind ofly can combine the Fibre Optical Communication Technology that one group of optical wavelength transmits with an optical fiber, and the development that DWDM technology is optical transfer network provides higher bandwidth and larger transmission capacity.Dispersion refers in optical fiber the phenomenon of the caused optical pulse broadening of distinct group speed of different wave length in light source light spectrum composition, and dispersion has caused the decline of receiving terminal decision threshold, produces the mistakes such as error code, is therefore the principal element of restriction transmission rate.But dispersion degree neither be the smaller the better, in order effectively to suppress nonlinear effect, need to be by dispersion extent control in certain scope.
In order to make system works at optimum dispersion compensating coefficient, in prior art, use and be built in optical transport unit (Optical Channel Transport Unit, be called for short: OTU) (Tunable Dispersion Compensation is called for short: TDC) realize the Tunable Dispersion Compensator in veneer.The TDC function that automatically adjusts is generally comprised of two steps: coarse adjustment and meticulous adjusting.Wherein: coarse adjustment adopts and changes dispersion adjustment value, the method for constantly attempting, generally since 0 dispersion, regulates in 0 dispersion left and right according to certain step-length, and in coarse adjustment process, business is interrupted; After coarse adjustment completes, business connects, and now proceeds meticulous adjusting, so that entangle the front error rate, reaches minimum.
The problem of prior art is: when carrying out service fulfillment and protection and switch, because dispersion values changes larger, therefore must first use coarse adjustment, but the starting point of coarse adjustment of the prior art is generally fixed as 0 dispersion, then according to a fixed step size, constantly attempt, therefore the time of cost is long, after tested, when the dwdm system of existing 40G adopts coarse adjustment method, can cause service outage duration to reach 5 to 10 minutes, far beyond the requirement of the 50ms protection switch time that requires of transmission system, thereby the speed of opening to business, protect the resume speed of business while switching to produce very large impact.
Summary of the invention
The invention provides a kind of dispersion adjusting method and device, in order to the long-time service disconnection of avoiding coarse adjustment to cause.
One aspect of the present invention provides a kind of dispersion adjusting method, comprising:
Dispersion accommodation device is searched the first chosen candidate value, and this first chosen candidate value is the measured value measuring by the input dispersion to dwdm system;
When finding described the first chosen candidate value, described dispersion accommodation device is using this first chosen candidate value as input dispersion values;
Described dispersion accommodation device calculates dispersion adjustment value according to described input dispersion values and predetermined target dispersion value;
Described dispersion accommodation device carries out dispersion adjustment according to described dispersion adjustment value to described dwdm system.
The present invention provides a kind of dispersion accommodation device on the other hand, comprising:
Search module, for searching the first chosen candidate value, this first chosen candidate value is the measured value measuring by the input dispersion to dwdm system;
Select module, for when searching module searches to described the first chosen candidate value, using this first chosen candidate value as input dispersion values;
Computing module, for calculating dispersion adjustment value according to described input dispersion values and the predetermined target dispersion value of selecting module to select;
Adjustment module, carries out dispersion adjustment for the described dispersion adjustment value calculating according to computing module to described dwdm system.
The present invention directly selects to input dispersion values and carries out dispersion adjustment, compare with the existing test method successively by fixed routine searching dispersion adjustment approximation, effectively reduce the time of dispersion adjustment, improved the speed that new business is set up and protection is switched, avoided the long-time interruption of business; And whole process does not need artificial participation to set, and can automatically carry out dispersion adjustment.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the flow chart of dispersion adjusting method embodiment of the present invention;
Fig. 2 is the structural representation of the existing dwdm system based on OLP;
Fig. 3 is the structural representation of dispersion accommodation device embodiment of the present invention;
Fig. 4 is the optional structural representation of the another kind of dispersion accommodation device embodiment of the present invention.
Embodiment
For making object, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 1 is the flow chart of dispersion adjusting method embodiment of the present invention, as shown in the figure, comprises the steps:
Step 100, dispersion accommodation device is searched the first chosen candidate value, and this first chosen candidate value is the measured value measuring by the input dispersion to dwdm system, when finding described the first chosen candidate value, execution step 110, otherwise execution step 120.
Wherein, using described measured value as the first chosen candidate value, be because the accuracy of the input dispersion values measuring by dispersion measuring instrument is higher, real-time is better.Concrete measuring process can be realized by existing dispersion measuring instrument.This measured value measuring while regulating can be preserved the save value using while regulating as next time.
Application scenarios as required, this step can have different triggering modes.For example, when described dwdm system will carry out new business while opening, need to trigger and carry out this step, to carry out dispersion adjustment.Again for example; between primary route in described dwdm system and alternate routing, occur to protect while switching; because the dispersion degree of different routes is different, the input dispersion values before switching is also no longer available, and therefore need to trigger this step searches the first new chosen candidate value again.
Step 110, described dispersion accommodation device, using described the first chosen candidate value as input dispersion values, after this, continues execution step 160.
If can find described the first chosen candidate value, because the accuracy of measured value is high, real-time good, therefore directly elect this first chosen candidate value as input dispersion values, for the dispersion adjustment process of rear continuation.
Step 120, described dispersion accommodation device is searched the second chosen candidate value, and this second chosen candidate value is the save value obtaining after the measured value that measures when by dispersion adjustment is last time preserved, when finding described the second chosen candidate value, execution step 130, otherwise execution step 140.
As previously mentioned, measured value as the first chosen candidate value is measured and is obtained by dispersion measuring instrument, and dispersion measuring instrument is conventionally expensive, if a dwdm system is all used dispersion measuring instrument to carry out chromatic dispersion measurement while carrying out dispersion adjustment at every turn, this dispersion measuring instrument will be taken for a long time by this dwdm system, thereby cannot be shared and use by other dwdm systems, can only buy new dispersion measuring instrument for other dwdm systems, therefore cause this increase.
And in fact, the input dispersion values of same dwdm system is not the larger situation that always changes, when input dispersion values temporal evolution is relatively slow, the first chosen candidate value measuring while last time regulating regulates and also has very much reference value for this, therefore measured value last time can be saved as to the second chosen candidate value, in this step, when finding the first chosen candidate value, continue to search this second chosen candidate value.
Step 130, described dispersion accommodation device, using this second chosen candidate value as described input dispersion values, after this, continues execution step 160.
As previously mentioned, when input dispersion values temporal evolution is relatively slowly time, as the save value of the second chosen candidate value, also there is very much reference value, therefore in this step, using this second chosen candidate value as described input dispersion values, for the dispersion adjustment process of rear continuation.
Step 140, described dispersion accommodation device is searched the 3rd chosen candidate value, and the 3rd chosen candidate value is the calculated value obtaining after input dispersion being calculated according to the optical fiber parameter of described dwdm system, when finding described the 3rd chosen candidate value, execution step 150, otherwise finish whole adjustment process.
Wherein, described optical fiber parameter comprises: fiber lengths, abbe number, dispersion compensating fiber length etc., these parameters are parameters of optical fiber itself, are therefore known.The input dispersion values calculating according to these optical fiber parameters is called calculated value, as the 3rd chosen candidate value.In the time above-mentioned the second chosen candidate value could not being found due to reasons such as memory limitations, can continue to search the 3rd chosen candidate value.If the 3rd chosen candidate value does not find yet, described in the present embodiment, dispersion adjustment process cannot be proceeded down so, can only finish whole adjustment process, restart.
Step 150, described dispersion accommodation device, using the 3rd chosen candidate value as input dispersion values, after this, continues execution step 160.
As mentioned above, when the first chosen candidate value and the second chosen candidate value are all searched unsuccessfully, can be using the 3rd chosen candidate value as input dispersion values, although as the calculating of the 3rd chosen candidate value not as the accuracy of the measured value as the first chosen candidate value high, but for the not high system of required precision, also can reach certain dispersion adjustment effect.
Step 160, described dispersion accommodation device calculates dispersion adjustment value according to described input dispersion values and predetermined target dispersion value.
Wherein, described input dispersion values is selected to obtain from aforementioned three chosen candidate values; Described target dispersion value refers to the desired value reaching after dispersion adjustment, and this value can pre-determine according to the performance requirement of dwdm system; Dispersion adjustment value is target dispersion value and the difference of inputting dispersion values, has positive and negative dividing, and concrete example can be referring to subsequent content.
It should be noted that, any one dwdm system has a dispersion adjustment scope herein, if dispersion degree has surpassed this scope, regulates and also cannot accomplish the end in view in any case, now, can only adopt other measures of prior art to be corrected.Therefore, when occurring, this situation carries out follow-up meaningless work, can be before calculating dispersion adjustment value, first judge whether described input dispersion values is positioned at the dispersion adjustment scope of described dwdm system, if so, according to described input dispersion values and described target dispersion value, calculate described dispersion adjustment value; If not, stop carrying out described dispersion adjusting method.
Step 170, described dispersion accommodation device carries out dispersion adjustment according to described dispersion adjustment value to described dwdm system.
Particularly, can directly use this dispersion adjustment value to carry out dispersion adjustment by pilot light delivery unit, and need not be again since the continuous trial of 0 dispersion.
Described in the present embodiment, method is directly selected to input dispersion values and is carried out dispersion adjustment, compare with the existing test method successively by fixed routine searching dispersion adjustment approximation, effectively reduced the time of dispersion adjustment, improve the speed that new business is set up and protection is switched, avoided the long-time interruption of business; And whole process does not need artificial participation to set, and can automatically carry out dispersion adjustment.
Below illustrate the technique effect of method described in the present embodiment.As shown in Figure 2; for existing, based on light path, protect (Optical Line Protection; be called for short: the structural representation of dwdm system OLP); wherein shown two optical touch modules (Optical Touch Module; be called for short: OTM) station and a light path are amplified (Optical Line Amplifier, abbreviation: OLA) station.
If do not adopt this, do not implement described method; in 10G dwdm system; because dispersion tolerance is enough large; in optical transport unit OTU, without built-in automatic dispersion compensation automatic dispersion, compensate (Adaptive Dispersion Compensation; be called for short: ADC); when OLP protection is switched, protection switch time is less than 50ms, has reached carrier-class protective standard.Under equal physical condition, 40G DWDM transmission system is compared with 10G DWDM transmission system, and dispersion tolerance reduces by 16 times, generally only has tens ps/nm, thus the optical transport unit OTU line side receiving port of 40G all built-in automatic dispersion compensation ADC.Because adopting temperature, ADC controls dispersion compensation value; speed is slow; find dispersion compensation point simultaneously and adopt set program; 0 dispersion of take is constantly attempted as benchmark left and right; general 40G dwdm system OLP protection switch time is still within 50ms, but business (entangles rear without error code) approximately to need the time of 5-10 minute from interrupting to recovering.This has seriously affected the protection restorability of 40G dwdm system.
Be 5～10 minutes protection recovery time of existing 40G dwdm system, and OLP protection switch time is less than 50ms, and all the other are the time that ADC finds dispersion compensation value.If artificial, directly set dispersion compensation value, and the dispersion compensation value of setting is correct, only need to tens second time business can recovers.If but the artificial dispersion compensation value of setting is incorrect, business cannot be recovered, system default adopts the coarse adjustment method of automatic dispersion compensation, and 0 dispersion of still take is constantly attempted as benchmark left and right, and be still 5～10 minutes recovery time.And the Switchover mechanism while there is catastrophic failure in network is often switched in OLP protection, attendant is difficult to arrive in and correctly set dispersion adjustment value in the very first time, and the cost of Automatic-searching dispersion adjustment value is the interruption that existing network exists 5～10 minutes.
If method described in employing the present embodiment, in system shown in Figure 2, suppose the input dispersion values 330ps/nm of optical transport unit on primary route, the dispersion adjustment value obtaining by method described in the present embodiment is-220ps/nm, the positive dispersion that the target dispersion value keeping after dispersion adjustment is 110ps/nm, to suppress the nonlinear effects such as four wave mixing, obtain best transmission performance, minimumly entangle the front error rate.If primary route occurs disconnected fine, business is switched to alternate routing and gets on, and because the fiber lengths of primary and backup route is different, optical fiber situation is different, dispersion values also can be different.Suppose that the input dispersion values measuring in alternate routing by dispersion measuring instrument is 450ps/nm, the dispersion adjustment value obtaining by method described in the present embodiment is-340ps/nm, can still keep target dispersion value is the positive dispersion of 110ps/nm, to obtain best transmission performance.
Suppose not use dispersion measuring instrument to measure in real time, but select as the save value of the second chosen candidate value as input dispersion values, suppose that this input dispersion values is 440ps/nm, after the optical fiber of 1 year is aging, now the actual input dispersion values of optical transport unit light inlet is 450ps/nm, although save value and actual input dispersion values be difference to some extent, but difference is not very large, the dispersion adjustment value obtaining after calculating is-330ps/nm, the target dispersion value keeping after regulating is 120ps/nm, through simple meticulous adjusting, can very fast realize target dispersion values be also 110ps/nm again, make the speed ratio of service fulfillment still fast much since the continuous mode of attempting of 0 dispersion.
Fig. 3 is the structural representation of dispersion accommodation device embodiment of the present invention, can realize said method, as shown in the figure, this dispersion accommodation device 10 at least comprises: search module 11, select module 12, computing module 13 and adjustment module 14, its operation principle is as follows:
First by searching module 11, search the first chosen candidate value, this first chosen candidate value is the measured value measuring by the input dispersion to dwdm system.Concrete measuring process can be realized by existing dispersion measuring instrument.This measured value measuring while regulating can be preserved the save value using while regulating as next time.
In addition, application scenarios as required, the execution of searching module 11 can have different triggering modes.For example, when described dwdm system will carry out new business while opening, need to trigger and search module 11 and carry out search procedures, to carry out dispersion adjustment.Again for example; as shown in Figure 4; can switch situation by the primary route in the described dwdm system of detection module 15 detection and the protection between alternate routing; when detection module 15 detects when protection occurring between primary route in described dwdm system and alternate routing and switching; because the dispersion degree of different routes is different; input dispersion values before switching is also no longer available, searches module 11 and search described the first chosen candidate value described in therefore being triggered by this detection module 15.
When searching module 11 while finding described the first chosen candidate value, by selecting module 12 using this first chosen candidate value as input dispersion values; When searching module 11 while not finding described the first chosen candidate value, continue to search the second chosen candidate value, this second chosen candidate value is the save value obtaining after the measured value that measures when by dispersion adjustment is last time preserved; When searching module 11 while finding described the second chosen candidate value, by this, select module 12 using this second chosen candidate value as described input dispersion values; When searching module 11 while not finding described the second chosen candidate value, continue to search the 3rd chosen candidate value, the 3rd chosen candidate value is the calculated value obtaining after input dispersion being calculated according to the optical fiber parameter of described dwdm system; When searching module 11 while finding described the 3rd chosen candidate value, by described selection module 12 using the 3rd chosen candidate value as input dispersion values.If the 3rd chosen candidate value does not find yet, described in the present embodiment, dispersion adjustment process cannot be proceeded down so, can only finish whole adjustment process, restart.About illustrating of above-described measured value, save value and calculated value, can be referring to the related content of said method embodiment.
After selection module 12 has been selected input dispersion values, by computing module 13, according to described input dispersion values and the predetermined target dispersion value of selecting module 12 to select, calculate dispersion adjustment value.Alternatively, as shown in Figure 4, in this dispersion accommodation device 10, judge module 16 can also be further set, before carrying out calculation procedure at computing module 13, prejudge the dispersion adjustment the scope whether described input dispersion values of selecting module 12 to select is positioned at described dwdm system; If so, trigger described computing module 13 and calculate described dispersion adjustment value according to described input dispersion values and described target dispersion value; If not, stop carrying out dispersion adjustment.The wherein explanation of relevant dispersion adjustment scope, can be referring to the related content of said method embodiment.
After this, the described dispersion adjustment value that adjustment module 14 calculates according to computing module 13 is carried out dispersion adjustment to described dwdm system.Particularly, can directly use this dispersion adjustment value to carry out dispersion adjustment by pilot light delivery unit, and need not be again since the continuous trial of 0 dispersion.
Described in the present embodiment, device directly selects input dispersion values to carry out dispersion adjustment, compare with the existing test method successively by fixed routine searching dispersion adjustment approximation, effectively reduced the time of dispersion adjustment, improve the speed that new business is set up and protection is switched, avoided the long-time interruption of business; And whole process does not need artificial participation to set, and can automatically carry out dispersion adjustment.One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can complete by the relevant hardware of program command, aforesaid program can be stored in a computer read/write memory medium, this program, when carrying out, is carried out the step that comprises said method embodiment; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CDs.
Finally it should be noted that: above embodiment only, in order to technical scheme of the present invention to be described, is not intended to limit; Although the present invention is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (8)
1. a dispersion adjusting method, is characterized in that, comprising:
Dispersion accommodation device is searched the first chosen candidate value, and this first chosen candidate value is the measured value measuring by the input dispersion to dwdm system;
When finding described the first chosen candidate value, described dispersion accommodation device is using this first chosen candidate value as input dispersion values;
Described dispersion accommodation device calculates dispersion adjustment value according to described input dispersion values and predetermined target dispersion value;
Described dispersion accommodation device carries out dispersion adjustment according to described dispersion adjustment value to described dwdm system;
Wherein, when finding described the first chosen candidate value, also do not comprise:
Described dispersion accommodation device is searched the second chosen candidate value, and this second chosen candidate value is the save value obtaining after the measured value that measures when by dispersion adjustment is last time preserved;
When finding described the second chosen candidate value, described dispersion accommodation device is using this second chosen candidate value as described input dispersion values.
2. method according to claim 1, is characterized in that, when finding described the second chosen candidate value, does not also comprise:
Described dispersion accommodation device is searched the 3rd chosen candidate value, and the 3rd chosen candidate value is the calculated value obtaining after input dispersion being calculated according to the optical fiber parameter of described dwdm system;
When finding described the 3rd chosen candidate value, described dispersion accommodation device is using the 3rd chosen candidate value as input dispersion values.
3. method according to claim 1, is characterized in that, described dispersion accommodation device calculates dispersion adjustment value according to described input dispersion values and predetermined target dispersion value and comprises:
Judge whether described input dispersion values is positioned at the dispersion adjustment scope of described dwdm system;
If so, according to described input dispersion values and described target dispersion value, calculate described dispersion adjustment value;
If not, stop carrying out described dispersion adjusting method.
4. method according to claim 1; it is characterized in that; described dispersion accommodation device is searched the first chosen candidate value and is comprised: between the primary route in described dwdm system and alternate routing, occur to protect while switching, trigger described dispersion accommodation device and search described the first chosen candidate value.
5. a dispersion accommodation device, is characterized in that, comprising:
Search module, for searching the first chosen candidate value, this first chosen candidate value is the measured value measuring by the input dispersion to dwdm system;
Select module, for when searching module searches to described the first chosen candidate value, using this first chosen candidate value as input dispersion values;
Computing module, for calculating dispersion adjustment value according to described input dispersion values and the predetermined target dispersion value of selecting module to select;
Adjustment module, carries out dispersion adjustment for the described dispersion adjustment value calculating according to computing module to described dwdm system;
Wherein, described in search module also for when not finding described the first chosen candidate value, search the second chosen candidate value, this second chosen candidate value is the save value obtaining after the measured value that measures when by dispersion adjustment is last time preserved;
Described selection module is also for when searching module searches to described the second chosen candidate value, using this second chosen candidate value as described input dispersion values.
6. device according to claim 5, is characterized in that:
The described module of searching, also for when not finding described the second chosen candidate value, is searched the 3rd chosen candidate value, and the 3rd chosen candidate value is the calculated value obtaining after input dispersion being calculated according to the optical fiber parameter of described dwdm system;
Described selection module is also for when searching module searches to described the 3rd chosen candidate value, using the 3rd chosen candidate value as input dispersion values.
7. according to the device described in claim 5 or 6, it is characterized in that, also comprise:
Judge module, for judging whether the described input dispersion values of selecting module to select is positioned at the dispersion adjustment scope of described dwdm system; If so, trigger described computing module and calculate described dispersion adjustment value according to described input dispersion values and described target dispersion value; If not, stop carrying out dispersion adjustment.
8. device according to claim 5, is characterized in that, also comprises: detection module, for when detecting when protection occurring between the primary route of described dwdm system and alternate routing and switching, search the first chosen candidate value described in module searches described in triggering.
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| WO2022256972A1 (en) * | 2021-06-07 | 2022-12-15 | 华为技术有限公司 | Optical fiber switching method and apparatus |
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| CN1479478A (en) * | 2002-07-23 | 2004-03-03 | �ձ����ŵ绰��ʽ���� | Dispersion monitoring method and device and dispersion slope temp, relativity compensation method and equipment |
| CN1913397A (en) * | 2005-05-18 | 2007-02-14 | 电子科技大学 | Dispersion real-time monitoring method applied in DWDM high speed transmission system |
| CN101162962A (en) * | 2006-10-13 | 2008-04-16 | 中兴通讯股份有限公司 | Dispersion compensation process of DWDM system |
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| CN1479478A (en) * | 2002-07-23 | 2004-03-03 | �ձ����ŵ绰��ʽ���� | Dispersion monitoring method and device and dispersion slope temp, relativity compensation method and equipment |
| CN1913397A (en) * | 2005-05-18 | 2007-02-14 | 电子科技大学 | Dispersion real-time monitoring method applied in DWDM high speed transmission system |
| CN101162962A (en) * | 2006-10-13 | 2008-04-16 | 中兴通讯股份有限公司 | Dispersion compensation process of DWDM system |
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