CN105577268A - Optical network equipment, optical module and optical link detection method - Google Patents
Optical network equipment, optical module and optical link detection method Download PDFInfo
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- CN105577268A CN105577268A CN201410551128.7A CN201410551128A CN105577268A CN 105577268 A CN105577268 A CN 105577268A CN 201410551128 A CN201410551128 A CN 201410551128A CN 105577268 A CN105577268 A CN 105577268A
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Abstract
The invention discloses optical network equipment, an optical module and an optical link detection method. The optical module comprises a coupling lens located in the optical module and a dielectric film reflector, wherein a surface of the coupling lens, which is close to a side of a detector or a laser, is plated with a dielectric film so as to form the dielectric film reflector; and the dielectric film reflector is used for reflecting a test signal of a detector and transmitting a work signal. By using the optical network equipment, the optical module and the optical link detection method provided in the invention, the dielectric film reflector formed through plating the dielectric film on the coupling lens of the optical module can realize an optical link measurement and diagnosis function based on OTDR; cost is low, components are saved and unification assembling can be achieved; OTDR detection can be realized without changing a device structure in an optical communication system.
Description
Technical field
The present invention relates to optical communication field, particularly relate to a kind of optical network device, optical module and optical link detection method.
Background technology
OTDR (OpticalTimeDomainReflectometer, optical time domain reflectometer) be a kind of optoelectronic integration instrument of precision, the backscattering that Rayleigh scattering when utilizing light to transmit in a fiber and Fresnel reflection produce is measured and diagnostic light link, it is widely used among the maintenance of lightguide cable link, construction, can carry out the measurement of fiber lengths, transmission attenuation, joint decay and fault location etc.Utilize OTDR carry out optical communication system carry out optical link measurement and diagnosis time, face and how to realize the measurement of light path performance and the problem of fault location.Particularly at PON (PassiveOpticalNetwork, passive optical-fiber network) in optical access network system, because ODN (OpticalDistributionNode, Optical Distribution Node) introduces optical branching device, on branch optical fiber, OTDR test light pulse signal is significantly decayed.Meanwhile, on fault branch optical fiber, the backscatter signals of decay events can be subject to again the backscatter signals superposition interference of other branch optical fibers, causes OTDR decay events on branch optical fiber cannot be detected as a rule.
In order to improve the detectivity of OTDR to optical link end to end performance, in prior art, generally in ONU (OpticalNetworkUnit, optical network unit) side, a wavelength selective reflectors is installed.At present, the mode of installing wavelength selective reflectors comprises: on covered wire cable, install FBG (FiberBraggGrating, bragg grating), or the wavelength selective reflectors based on deielectric-coating is set in optical network unit side flange dish or cold connector.
But bragg grating is generally tens of unit, and cost is higher, be difficult in a short time popularize; Need the structure or the rubber-insulated wire fused fiber splice scene that change ring flange/cold connector when reflector is set in ring flange or cold connector, be generally difficult to guarantee 100% and install; Part of devices needs on-the-spot maintenance personnel to install, and requires high to the management and control of Contraction in Site.
Summary of the invention
In view of this, the technical problem that the disclosure will solve be how to provide that a kind of cost is low, structure is simple, be convenient to the deielectric-coating reflector of unified assembling to realize the detection of OTDR.
The disclosure provides a kind of optical module of light net equipment, comprising:
Be positioned at the coupled lens of optical module;
On the surface of detector or laser side, the deielectric-coating reflector that deielectric-coating formed is coated with at coupled lens, for reflecting the test signal of detector, and transmissive operation signal.
Alternatively, optical module comprises optical fiber receive module ROSA and/or Single-fiber bidirectional optical transmit-receive component BOSA.
Alternatively, ROSA comprises:
Be positioned at the coupled lens of optical fiber receive module ROSA;
On the surface of detector side, be coated with the deielectric-coating reflector of deielectric-coating formation at coupled lens, the test signal for the optical time domain reflectometer OTDR by tail optical fiber outgoing is reflected back in tail optical fiber.
Alternatively, BOSA comprises:
Be positioned at the coupled lens of Single-fiber bidirectional optical transmit-receive component BOSA;
On the surface of detector or laser side, the deielectric-coating reflector that deielectric-coating formed is coated with, for the OTDR test signal of tail optical fiber outgoing being reflected back in tail optical fiber at coupled lens.
Alternatively, coupled lens is coated with multilayer dielectric film.
Alternatively, optical module arranges the bandwidth of operation of deielectric-coating according to the test signal of OTDR, and the bandwidth of operation of deielectric-coating is 1620nm to 1680nm or 1595nm to 1655nm.
Alternatively, the reflectivity of deielectric-coating is more than 90%.
Alternatively, the power loss of deielectric-coating is not more than 10dB.
The disclosure also provides a kind of optical network device, comprising: as the optical module of above-mentioned optical network device.
The disclosure also provides a kind of optical link detection method, comprising:
Launch detection signal;
Receive reflected signal, reflected signal plates at coupled lens deielectric-coating reflector reflects detection signal that deielectric-coating formed by the coupled lens being positioned at optical module and produces on the surface of detector or laser side;
According to reflected signal diagnostic light link, determine the fault of optical link or fault is positioned.
The optical network device that the disclosure provides, optical module and optical link detection method, the coupled lens of optical module is coated with the deielectric-coating reflector that deielectric-coating is formed, the optical link that can realize based on OTDR is measured and diagnostic function, and cost is low, save original paper, can unify assembling, do not need the structure changing device in optical communication system can realize the detection of OTDR.
Accompanying drawing explanation
Fig. 1 illustrates the structural representation of the optical communication system of one embodiment of the invention;
Fig. 2 illustrates the structural representation of the BOSA of one embodiment of the invention;
Fig. 3 illustrates the structural representation of the ROSA of one embodiment of the invention; And
Fig. 4 illustrates the flow chart of the optical link detection method of one embodiment of the invention.
Embodiment
With reference to the accompanying drawings the present invention is described more fully, exemplary embodiment of the present invention is wherein described.
Fig. 1 illustrates the structural representation of the optical communication system of one embodiment of the invention.As shown in Figure 1, this optical communication system mainly comprises: voice network 101, data network 102, video net 103, OLT104 (opticallineterminal, optical line terminal), Optical Distribution Frame ODF105, trunk optical fiber 106, Optical cross connects case 107, Distribution fibers 108, light fiber distribution box 109, optical branching device 110, introducing optical fiber 111, optical fiber socket box 112, indoor optical fiber 113, optical network unit 114, on-the-spot optical network device such as one-tenth terminal 115, cold connector 116 etc.
At PON (PassiveOpticalNetwork, passive optical-fiber network) in system, PON uses single fiber to be connected to the OLT104 of central office, is then connected to optical network unit 114 through ODN (OpticalDistributionNetwork, optical distribution network).At down direction, the multiple business such as IP data, voice, video adopt broadcast mode by the OLT104 being positioned at central office, are assigned to all optical network units 114 on PON by the 1:N passive optical splitter in ODN and optical branching device 110.At up direction, the multiple business information from each optical network unit 114 is coupled to same optical fiber by the 1:N passive light mixer in ODN without interfering with each other, finally delivers to and is positioned at local side OLT 104, be similar to the structure of point-to-point.
Wherein, optical network unit 114 can comprise ONU and ONT (OpticalNetworkTerminal, Optical Network Terminal), and the difference of ONU and ONT is that ONT can be located immediately at user side, and also has other network between ONU and user, as Ethernet etc.ONU can be divided into active optical network unit and passive optical network unit, and the equipment of optical receiver, up optical sender, multiple bridging amplifier network monitoring is generally housed.
In one embodiment, can at optical network device as optical network unit 114 arranges at least one optical module, wherein, can be BOSA (Bi-directionalOpticalSub-assembly in optical module, Single-fiber bidirectional optical transmit-receive component) or the module such as ROSA (ReceiverOpticalSubassembly, optical fiber receive module).
In one embodiment, the optical module in optical network device comprises: the coupled lens being positioned at optical module; On the surface of detector or laser side, the deielectric-coating reflector that deielectric-coating formed is coated with at coupled lens, for reflecting the test signal of detector, and transmissive operation signal.
Particularly, if this optical module comprises optical fiber receive module ROSA, this ROSA comprises the coupled lens being positioned at ROSA; On the surface of detector side, be coated with the deielectric-coating reflector of deielectric-coating formation at coupled lens, the test signal for the optical time domain reflectometer OTDR by tail optical fiber outgoing is reflected back in tail optical fiber.If this optical module comprises Single-fiber bidirectional optical transmit-receive component BOSA, this BOSA comprises: the coupled lens being positioned at BOSA; On the surface of detector or laser side, the deielectric-coating reflector that deielectric-coating formed is coated with, for the OTDR test signal of tail optical fiber outgoing being reflected back in tail optical fiber at coupled lens.
The intensity of the light pulse that OTDR is returned by this deielectric-coating reflector reflects of detection, can measure accurately from OLT104 to the decay of the optical link of each optical network unit 114, and carry out ODN link health analysis and performance prediction based on the historical data of the strong reflection pulse strength of the deielectric-coating reflector in optical network unit 114.In addition, by effectively being distinguished by strong reflection event on OTDR curve each optical network unit 114, thus the location realized wear-out failure on ODN and measurement.
It should be noted that, although for BOSA and ROSA describe the plating of coupled lens in optical module deielectric-coating reflector formation, but the present invention is not limited thereto, those skilled in the art can arrange deielectric-coating reflector according to actual conditions, such as, this coupled lens plating deielectric-coating reflector can also be installed in single fiber three-way assembly (Triplexer) or similar optical module, as long as the test signal reflecting detector can be realized, and the effect of transmissive operation signal.
Like this, on the surface of laser or detector side, plate deielectric-coating by the coupled lens of the BOSA/ROSA in user's sidelight module and realize wavelength selective reflectors, OTDR test signal to reflect back in tail optical fiber and the operation wavelength of this optical communication system of transmission by this deielectric-coating.And do not need to change BOSA/ROSA interior lights line structure, do not introduce new device, utilize the condition of existing production technology to be namely produced on a large scale, assembling can be unified, have cost low, of good reliability, save the advantages such as original paper.
Further, coupled lens is coated with multilayer dielectric film, can reflecting effect be strengthened like this.
In one embodiment, the bandwidth of operation of deielectric-coating can be set according to the test signal of OTDR.Can arrange deielectric-coating reflector bandwidth of operation be 1620nm to 1680nm.
In general PON system and OTDR combined system, the centre wavelength for OTDR measurement and diagnosis detection signal of generally acknowledging at present is 1650nm or 1625nm, the strong reflection bandwidth of operation that can arrange deielectric-coating reflector is OTDR centre wavelength each below 30nm up and down, and the bandwidth of operation that therefore can arrange deielectric-coating reflector is 1620nm to 1680nm or 1595nm to 1655nm.The centre wavelength of the laser of OTDR may not be accurate 1650nm/1625nm, can change within the specific limits around 1650nm/1625nm, arranges institute's likely wavelength that wide reflection band can cover OTDR laser, realizes the tolerance to OTDR emission wavelength.
Those skilled in the art also according to the bandwidth of operation of actual conditions selected media film reflector, to make it possible to the detection signal reflecting OTDR, and can ensure that the working signal of optical communication system can pass through normally.Whether those skilled in the art should fully take into account this deielectric-coating reflector at the bandwidth of operation of design deielectric-coating can disturb existing PON operation wavelength, such as, consider that NG-PON2 system can use 1610nm wavelength, or WDMOVERLAY system can use 1620nm, if select the deielectric-coating reflector of above-mentioned bandwidth of operation, the normal work of light communication system can be affected, therefore when selected media film reflector, the deielectric-coating reflector not disturbing PON system normally to work should be selected.
In one embodiment, deielectric-coating reflector 90% is at least to the reflectivity of test signal, be such as 98%, 99%, 99.99% etc., its power loss is less than 10dB, such as, be 1dB, 2dB, 8dB, 9dB etc.
It should be noted that, the present invention there is no concrete restriction to the incidence angle of the diameter of coupled lens, radius of curvature, surface accuracy, surface roughness, lens, the parameter such as dielectric material, thicknesses of layers, deielectric-coating reflector diameter, thickness deviation of plating deielectric-coating, and those skilled in the art can select the scope of above-mentioned parameter according to actual conditions.Such as, in actual applications, those skilled in the art can adopt the design identical with traditional planar medium film reflector.
Optical module in the optical network device of the present embodiment, for the optical communication system of point-to-multipoint EPON with other point-to-points, the optical link that can realize based on OTDR is measured and diagnostic function, and cost is low, save original paper, can unify assembling, do not need the structure changing device in optical communication system can realize the detection of OTDR.
Fig. 2 illustrates the structural representation of the BOSA of one embodiment of the invention.The present embodiment assembly same as the previously described embodiments has identical function, for simplicity's sake, omits the detailed description to these assemblies.As shown in Figure 2, this BOSA optical module mainly comprises: tail optical fiber 200, coupled lens 201, dielectric coating filter 203, laser 205, photo-detector 204, wherein coupled lens 201 is coated with deielectric-coating and forms deielectric-coating reflector 202, for reflecting the test signal of detector, and transmissive working signal.
Particularly, in BOSA, the devices such as tail optical fiber 200, the dielectric coating filter 203 of coupled lens 201,45 °, the laser 205 of TO-CAN encapsulation are distributed with respectively along main optical path, the photo-detector 204 having TO-CAN to encapsulate below 45 ° of dielectric coating filters from local side side OLT to user side.Wherein, tail optical fiber 200 has the end face of APC model, and microballoon face grinding and polishing is also done, to reduce end face reflection in 8 °, this end face inclination angle.Coupled lens 201 is " collimating lens ", is mainly used in converging beam, improves laser and sends the coupling efficiency of light to tail optical fiber 200.The conjunction that 45 ° of dielectric coating filters 203 realize up light beam and descending light beam divides wave energy, namely descending special wavelength such as the light beam of 1490nm is reflected the photo-detector 204 entering TO-CAN encapsulation by 45 ° of dielectric coating filters 203, up special wavelength is different from downstream wavelength, be generally 1310nm, after the laser 205 encapsulated sends, after 45 ° of dielectric coating filters 203, enter tail optical fiber 200 through overcoupling lens 201 by TO-CAN.
As shown in Figure 2, coupled lens coupled lens 201 in optical module ROSA plates deielectric-coating to realize wavelength selective reflectors, multilayer dielectric film can be plated on coupled lens coupled lens 201, the bandwidth of operation of deielectric-coating is 1620nm to 1680nm, reflectivity is more than 90%, and the power loss of deielectric-coating is not more than 10dB.OTDR test signal shines after main optical path from tail optical fiber 200 and is reflected back in tail optical fiber 200 through overcoupling lens 201 by the deielectric-coating reflector 202 lens; The downlink working wavelength signals of this optical communication system then through coupled lens 201 and on deielectric-coating reflector 202, and reflected into by 45 ° of dielectric coating filters and detect into photo-detector 204; The up operation wavelength of this optical communication system send from laser laggard enter main optical path, through 45 ° of dielectric coating filters, and through coupled lens 201 and on deielectric-coating reflector 202 enter tail optical fiber 200.
It should be noted that, the Film Design of the deielectric-coating reflector 202 on coupled lens 201 can be identical with traditional plating media film optical filters with production technology.Do not need to change BOSA interior lights line structure, only need to replace original coupled lens with the coupled lens 201 with deielectric-coating reflector 202.
Measure and diagnostic system for the optical link based on OTDR, by the coupled lens of plating deielectric-coating reflector built-in in the optical module in optical network device, the diagnosis and detection of OTDR can be optimized, there is low, the easy realization of cost, stable and reliable for performance, scene adaptability is good, do the advantage of special operational without the need to field maintenance person.The location of OTDR to fiber optic network fault and the measurement capability of performance effectively can be improved by realizing optical module built-in reflective device.
Optical module in the optical network device of the present embodiment, the coupled lens of BOSA is coated with the deielectric-coating reflector that deielectric-coating is formed, and does not need to change device architecture and can realize the detection of OTDR, and cost is low, save original paper, can unify assembling.
Fig. 3 illustrates the structural representation of the ROSA of one embodiment of the invention.Assembly identical with Fig. 2 in Fig. 3 has identical function, for simplicity's sake, omits the detailed description to these assemblies.As shown in Figure 3, this ROSA optical module mainly comprises: tail optical fiber 300, coupled lens 301, photo-detector 303, wherein coupled lens 301 is coated with deielectric-coating and forms deielectric-coating reflector 302, for reflecting the test signal of detector, and transmissive working signal.
Particularly, the structure of ROSA can be similar with BOSA, and difference is that ROSA does not exist laser, and only carry out the reception of descending light beam, therefore photo-detector 303 can be arranged on main optical path.In optical module ROSA close photo-detector 303 side of coupled lens 301 surface on plate deielectric-coating reflector 302.OTDR test signal shines after main optical path from tail optical fiber 300 and is reflected back in tail optical fiber 300 through overcoupling lens 301 by the deielectric-coating reflector 302 lens; The downlink working wavelength signals of this optical communication system then through coupled lens 301 and on deielectric-coating reflector 302, and enter photo-detector 303 and detect.
It should be noted that, the method for designing of this deielectric-coating reflector 302 can be identical with ordinary flat deielectric-coating reflector with production technology, do not need to change ROSA interior lights line structure, only need to replace original coupled lens with the coupled lens 301 with deielectric-coating reflector 302.
Like this, the coupled lens in ROSA plates deielectric-coating, form deielectric-coating reflector, do not need to change the detection that device architecture can realize OTDR, and cost is low, save original paper, can unify assembling.
Fig. 4 illustrates the flow chart of the optical link detection method of one embodiment of the invention.As shown in Figure 4, the method mainly comprises:
Step S402, OTDR launch detection signal, detection signal arrives and is positioned at the coupled lens of optical module, plates deielectric-coating reflector reflects detection signal that deielectric-coating formed and form reflected signal by the coupled lens being positioned at optical module at coupled lens on the surface of detector or laser side.
Step S404, OTDR receive reflected signal.
Step S406, OTDR, according to reflected signal diagnostic light link, determine the fault of optical link or position fault.
Particularly, OTDR by launching one or more ultrashort pulse and the detection and positioning of detected reflectance signal realization to optical link fault in optical link, detect the spike (reflection) that relies in reflected signal or sink (decay), location then relies on spike in reflected signal and sagging time (time is directly proportional to occurrence positions).In the middle of practical application scene, the optical link based on OTDR is measured and is diagnosed mainly for detection of the decay events in optical communication system or reflection event.Such as, when external force is pressed on optical cable, or personnel's misoperation causes excessive fiber to bend, and now can decay events be detected by OTDR.When fibercuts, detected by OTDR, the reflection event of the end face broken to form can be detected.
Like this, the intensity of the light pulse that OTDR is returned by this deielectric-coating reflector reflects of detection just can be measured accurately from OLT to the decay of the optical link of each optical network unit, and carries out ODN link health analysis and performance prediction based on the historical data of the strong reflection pulse strength of the deielectric-coating reflector in optical module.In addition, by effectively being distinguished by strong reflection event on OTDR curve each optical network unit, thus the location realized wear-out failure on ODN and measurement.
The optical link detection method of the present embodiment, on the surface of laser/photo-detector side, plate deielectric-coating by the coupled lens of the BOSA/ROSA in user's sidelight module and realize wavelength selective reflectors, this deielectric-coating reflector cost is low, of good reliability, can unify assembling, OTDR test signal can be reflected back into the operation wavelength of also this optical communication system of transmission in tail optical fiber, the fault of energy diagnosis and detection optical communication link.
Description of the invention provides in order to example with for the purpose of describing, and is not exhaustively or limit the invention to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.Selecting and describing embodiment is in order to principle of the present invention and practical application are better described, and enables those of ordinary skill in the art understand the present invention thus design the various embodiments with various amendment being suitable for special-purpose.
Claims (10)
1. the optical module in optical network device, is characterized in that, comprising:
Be positioned at the coupled lens of described optical module;
On the surface of detector or laser side, the deielectric-coating reflector that deielectric-coating formed is coated with at described coupled lens, for reflecting the test signal of detector, and transmissive operation signal.
2. optical module according to claim 1, is characterized in that, described optical module comprises optical fiber receive module ROSA and/or Single-fiber bidirectional optical transmit-receive component BOSA.
3. optical module according to claim 2, is characterized in that, described ROSA comprises:
Be positioned at the coupled lens of described ROSA;
On the surface of detector side, be coated with the deielectric-coating reflector of deielectric-coating formation at described coupled lens, the test signal for the optical time domain reflectometer OTDR by tail optical fiber outgoing is reflected back in described tail optical fiber.
4. optical module according to claim 2, is characterized in that, described BOSA comprises:
Be positioned at the coupled lens of described BOSA;
On the surface of detector or laser side, the deielectric-coating reflector that deielectric-coating formed is coated with, for the OTDR test signal of tail optical fiber outgoing being reflected back in described tail optical fiber at described coupled lens.
5., according to the arbitrary described optical module of Claims 1-4, it is characterized in that,
Described coupled lens is coated with multilayer dielectric film.
6. optical module according to claim 5, is characterized in that,
Arrange the bandwidth of operation of described deielectric-coating according to the test signal of described OTDR, the bandwidth of operation of described deielectric-coating is 1620nm to 1680nm or 1595nm to 1655nm.
7. optical module according to claim 5, is characterized in that, the reflectivity of described deielectric-coating is more than 90%.
8. optical module according to claim 5, is characterized in that, the power loss of described deielectric-coating is not more than 10dB.
9. an optical network device, is characterized in that, comprising:
As the optical module in the optical network device as described in arbitrary in claim 1-8.
10. an optical link detection method, is characterized in that, comprising:
Launch detection signal;
Receive reflected signal, described reflected signal plates detection signal described in deielectric-coating reflector reflects that deielectric-coating formed by the coupled lens being positioned at described optical module at described coupled lens and produces on the surface of detector or laser side;
According to described reflected signal diagnostic light link, determine the fault of optical link or fault is positioned.
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| CN109547097A (en) * | 2017-09-22 | 2019-03-29 | 深圳市欧凌克光电科技有限公司 | Optical signal transmitting device capable of monitoring light intensity |
| CN110996193A (en) * | 2019-11-19 | 2020-04-10 | 华为技术有限公司 | Method, related device and system for identifying optical network unit connection port |
| EP4086676A1 (en) * | 2021-05-07 | 2022-11-09 | Ezconn Corporation | Optical time domain reflector structure and optical assembly |
| CN116961741A (en) * | 2023-07-24 | 2023-10-27 | 尚宁光电无锡有限公司 | Optical module test and debug system based on data analysis |
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