CN105577268B - Optical network device, optical module and optical link detection method - Google Patents
Optical network device, optical module and optical link detection method Download PDFInfo
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- CN105577268B CN105577268B CN201410551128.7A CN201410551128A CN105577268B CN 105577268 B CN105577268 B CN 105577268B CN 201410551128 A CN201410551128 A CN 201410551128A CN 105577268 B CN105577268 B CN 105577268B
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Abstract
The present invention discloses a kind of optical network device, optical module and optical link detection method.The optical module includes：Coupled lens in optical module；The deielectric-coating reflector of deielectric-coating formation is coated on the surface of detector or laser side in coupled lens, for reflecting the test signal of detector, and transmissive operation signal.Optical network device provided by the invention, optical module and optical link detection method, the deielectric-coating reflector of deielectric-coating formation is coated on the coupled lens of optical module, it can realize optical link measurement and diagnostic function based on OTDR, and at low cost, saving original paper can be unified to assemble, and the detection of OTDR can be realized in the structure for not needing to device in change optical communication system.
Description
Technical field
The present invention relates to a kind of optical communication field more particularly to optical network device, optical module and optical link detection methods.
Background technology
OTDR (Optical Time Domain Reflectometer, optical time domain reflectometer) is a kind of photoelectricity of precision
Integrated instrument, caused by the Rayleigh scattering and Fresnel reflection when being transmitted in a fiber using light backscattering measure with
Optical link is diagnosed, it is widely used among the maintenance of lightguide cable link, construction, can carry out fiber lengths, transmission attenuation, connector
Attenuation and the measurement of fault location etc..Using OTDR carry out optical communication system carry out optical link measurement and diagnosis when, face as
What realizes the problem of measurement and fault location of light path performance.Particularly PON (Passive Optical Network, it is passive
Fiber optic network) in optical access network system, since ODN (Optical Distribution Node, Optical Distribution Node) introduces light
Splitter, OTDR tests light pulse signal is significantly decayed on branch optical fiber.Meanwhile on fault branch optical fiber decay events the back of the body
It can be superimposed and interfere by the backscatter signals of other branch optical fibers again to scattered signal, OTDR is caused in most cases can not
Detect the decay events on branch optical fiber.
In order to improve detectivities of the OTDR to optical link end to end performance, in the prior art generally in ONU
(Optical Network Unit, optical network unit) side is installed by one wavelength selective reflectors.At present, installation wavelength selection
The mode of sexual reflex device includes：On covered wire cable install FBG (Fiber Bragg Grating, bragg grating) or
Person sets the wavelength selective reflectors based on deielectric-coating in optical network unit side flange or cold connector.
But bragg grating is generally tens of members, cost is higher, is difficult to popularize in a short time；Ring flange is cold
Connecing to set in son needs to change the structure of ring flange/cold connector or rubber-insulated wire fused fiber splice scene during reflector, it is difficult to ensure
100% installation；Part of devices needs live maintenance personnel's installation, the management and control of Contraction in Site is required high.
Invention content
In view of this, the disclosure technical problem to be solved be how to provide it is a kind of it is at low cost, simple in structure, be convenient for
Unify the deielectric-coating reflector of assembling to realize the detection of OTDR.
The disclosure provides a kind of optical module of light net equipment, including：
Coupled lens in optical module；
The deielectric-coating reflector of deielectric-coating formation is coated on the surface of detector or laser side in coupled lens,
For reflecting the test signal of detector, and transmissive operation signal.
Optionally, optical module includes light-receiving component ROSA and/or Single-fiber bidirectional optical transmit-receive component BOSA.
Optionally, ROSA includes：
Coupled lens in light-receiving component ROSA；
The deielectric-coating reflector of deielectric-coating formation is coated on the surface of detector side in coupled lens, for by tail
The test signal of the optical time domain reflectometer OTDR of fibre outgoing is reflected back in tail optical fiber.
Optionally, BOSA includes：
Coupled lens in Single-fiber bidirectional optical transmit-receive component BOSA；
The deielectric-coating reflector of deielectric-coating formation is coated on the surface of detector or laser side in coupled lens,
OTDR test signals for tail optical fiber to be emitted are reflected back in tail optical fiber.
Optionally, multilayer dielectric film is coated on coupled lens.
Optionally, optical module sets the bandwidth of operation of deielectric-coating, the bandwidth of operation of deielectric-coating according to the test signal of OTDR
For 1620nm to 1680nm or 1595nm to 1655nm.
Optionally, the reflectivity of deielectric-coating is more than 90%.
Optionally, the power attenuation of deielectric-coating is not more than 10dB.
The disclosure also provides a kind of optical network device, including：Such as the optical module of above-mentioned optical network device.
The disclosure also provides a kind of optical link detection method, including：
Transmitting detection signal；
Reflection signal is received, reflection signal close to detector or is swashed by the coupled lens that are located in optical module in coupled lens
The deielectric-coating reflector reflection detection signal that deielectric-coating is formed is plated on the surface of light device side and is generated；
According to reflection signal diagnosis optical link, determine the failure of optical link or failure is positioned.
Optical network device, optical module and the optical link detection method that the disclosure provides, on the coupled lens of optical module
Be coated with deielectric-coating formation deielectric-coating reflector, can realize based on OTDR optical link measurement and diagnostic function, and it is at low cost,
It saves original paper, can unify to assemble, the detection of OTDR can be realized in the structure for not needing to device in change optical communication system.
Description of the drawings
Fig. 1 shows the structure diagram of the optical communication system of one embodiment of the invention；
Fig. 2 shows the structure diagrams of the BOSA of one embodiment of the invention；
Fig. 3 shows the structure diagram of the ROSA of one embodiment of the invention；And
Fig. 4 shows the flow chart of the optical link detection method of one embodiment of the invention.
Specific embodiment
The present invention is described more fully with reference to the accompanying drawings, wherein illustrating exemplary embodiment of the present invention.
Fig. 1 shows the structure diagram of the optical communication system of one embodiment of the invention.As shown in Figure 1, the optical communication system
Mainly include：(optical line terminal, optical link are whole by voice network 101, data network 102, video network 103, OLT 104
End), Optical Distribution Frame ODF105, trunk optical fiber 106, light cross-connecting box 107, Distribution fibers 108, light fiber distribution box 109, optical branching device
110th, optical fiber 111, optical fiber socket box 112, indoor optical fiber 113, optical network unit 114 are introduced, it is live into terminal 115, cold connector
116 grade optical network devices.
In PON (Passive Optical Network, passive optical-fiber network) system, PON is connected to using single fiber
Then the OLT 104 of central office is connected to optical-fiber network through ODN (Optical Distribution Network, optical distribution network)
Unit 114.In down direction, the multiple business such as IP data, voice, video use broadcaster by the OLT 104 for being located at central office
Formula passes through 1 in ODN：N passive optical splitters, that is, optical branching device 110 is assigned to all optical network units 114 on PON.Upper
Line direction, the multiple business information from each optical network unit 114 pass through 1 in ODN without interfering with each other：N passive lights are combined
Device is coupled to same root optical fiber, is ultimately sent to be located at local side OLT 104, similar to the structure of point-to-point.
Wherein, optical network unit 114 can include ONU and ONT (Optical Network Terminal, optical-fiber network end
End), the difference of ONU and ONT are that ONT can be located immediately at user terminal, and also have other networks between ONU and user, such as ether
Net etc..ONU can be divided into active optical network unit and passive optical network unit, be generally equipped with photoreceiver, uplink optical sender,
The equipment of multiple bridging amplifier network monitorings.
In one embodiment, can at least one optical module be set in optical network device such as optical network unit 114, wherein,
In optical module can be BOSA (Bi-directional Optical Sub-assembly, Single-fiber bidirectional optical transmit-receive component) or
The modules such as ROSA (Receiver Optical Subassembly, light-receiving component).
In one embodiment, the optical module in optical network device includes：Coupled lens in optical module；It is saturating in coupling
Mirror is coated with the deielectric-coating reflector of deielectric-coating formation on the surface of detector or laser side, for reflecting detector
Test signal, and transmissive operation signal.
Specifically, if the optical module includes light-receiving, component ROSA, the ROSA include the coupled lens being located in ROSA；
Coupled lens are coated with the deielectric-coating reflector of deielectric-coating formation on the surface of detector side, for the light for being emitted tail optical fiber
The test signal of time-domain reflectomer OTDR is reflected back in tail optical fiber.It, should if the optical module includes Single-fiber bidirectional optical transmit-receive component BOSA
BOSA includes：Coupled lens in BOSA；Jie is coated on the surface of detector or laser side in coupled lens
The deielectric-coating reflector that plasma membrane is formed, the OTDR test signals for tail optical fiber to be emitted are reflected back in tail optical fiber.
OTDR by detecting the intensity of the reflected light pulse of deielectric-coating reflector, can accurately measure from
The optical link of OLT 104 to each optical network unit 114 is decayed, and based on the deielectric-coating reflector in optical network unit 114
The historical data of strong reflection pulse strength carries out ODN links health analysis and performance prediction.In addition, by each optical-fiber network list
Member 114 is effectively distinguished on OTDR curves by strong reflection event, so as to fulfill the positioning and survey to wear-out failure on ODN
Amount.
It should be noted that although coupled lens in optical module are described by taking BOSA and ROSA as an example plates deielectric-coating reflector
Composition, but the invention is not restricted to this, those skilled in the art can according to actual conditions set deielectric-coating reflector, for example,
The coupled lens deielectric-coating reflector be can also be plated and single fiber three-way component (Triplexer) or similar optical module are installed on
In, as long as the test signal of reflection detector can be realized, and the effect of transmissive operation signal.
In this way, by the coupled lens of the BOSA/ROSA in user side optical module close to laser or detector side
Deielectric-coating is plated on surface and realizes wavelength selective reflectors, which reflects back into OTDR test signals in tail optical fiber and transmit
The operation wavelength of the optical communication system.And it does not need to change light channel structure inside BOSA/ROSA, introduce new device, profit
It is produced on a large scale with the condition of existing production technology, assembling can be unified, there is at low cost, of good reliability, saving original paper
The advantages that.
Further, multilayer dielectric film is coated on coupled lens, reflecting effect can be enhanced in this way.
In one embodiment, the bandwidth of operation of deielectric-coating can be set according to the test signal of OTDR.Medium can be set
The bandwidth of operation of film reflector is 1620nm to 1680nm.
In general PON system and OTDR combined systems, generally acknowledged at present for OTDR measures and diagnoses detection signal
Centre wavelength for 1650nm or 1625nm, the strong reflection bandwidth of operation that can set deielectric-coating reflector is OTDR centre wavelengths
Up and down each 30nm hereinafter, therefore can set the bandwidth of operation of deielectric-coating reflector for 1620nm to 1680nm or 1595nm extremely
1655nm.The centre wavelength of the laser of OTDR may not be accurate 1650nm/1625nm, can surround 1650nm/1625nm
Change in a certain range, set what wide reflection band can cover OTDR lasers to be possible to wavelength, realize to OTDR hairs
The tolerance of ejected wave length.
Those skilled in the art can also enable to according to the bandwidth of operation of actual conditions selected media film reflector
The detection signal of OTDR is reflected, and can guarantee that the working signal of optical communication system can normally pass through.Those skilled in the art are setting
The bandwidth of operation of meter deielectric-coating should fully take into account whether the deielectric-coating reflector can interfere existing PON operation wavelengths, for example,
Can use 1610nm wavelength or WDM OVERLAY systems in view of NG-PON2 systems can use 1620nm, if selecting above-mentioned work
Make the deielectric-coating reflector of bandwidth, the normal work of light communication system can be influenced, therefore in selected media film reflector, it should
The deielectric-coating reflector that PON system works normally is not interfered in selection.
In one embodiment, the reflectivity to test signal of deielectric-coating reflector is at least 90%, for example, 98%,
99%th, 99.99% etc., power attenuation is less than 10dB, for example, 1dB, 2dB, 8dB, 9dB etc..
It should be noted that the present invention is to the diameter of coupled lens, radius of curvature, face precision, surface roughness, lens
The parameters such as incidence angle, dielectric material, thicknesses of layers, deielectric-coating reflector diameter, the thickness deviation for plating deielectric-coating have no specific limit
Fixed, those skilled in the art can select the range of above-mentioned parameter according to actual conditions.For example, in practical applications, those skilled in the art
The design identical with traditional planar medium film reflector may be used.
Optical module in the optical network device of the present embodiment, for point-to-multipoint passive optical network and other point-to-points
Optical communication system can realize that optical link based on OTDR measures and diagnostic function, and it is at low cost, save original paper, can unify
The detection of OTDR can be realized in assembling, the structure for not needing to device in change optical communication system.
Fig. 2 shows the structure diagrams of the BOSA of one embodiment of the invention.The present embodiment group same as the previously described embodiments
Part has the function of identical, for simplicity, omits the detailed description to these components.As shown in Fig. 2, the BOSA optical module masters
Including：Tail optical fiber 200, coupled lens 201, dielectric coating filter 203, laser 205, wherein optical detector 204, coupled lens
Deielectric-coating is coated on 201 and forms deielectric-coating reflector 202, for reflecting the test signal of detector, and can transmissive operation signal.
Specifically, in BOSA, tail optical fiber 200, coupled lens are distributed with respectively along main optical path from local side side OLT to user side
201st, the devices such as laser 205 that 45 ° of dielectric coating filter 203, TO-CAN are encapsulated, have below 45 ° of dielectric coating filters
The optical detector 204 of TO-CAN encapsulation.Wherein, tail optical fiber 200 has the end face of APC models, and microballoon face is simultaneously done in 8 ° of the end face inclination angle
Grinding and polishing, to reduce end face reflection.Coupled lens 201 are " collimation lens ", are mainly used for converging beam, improve laser hair
Light is sent to the coupling efficiency of tail optical fiber 200.45 ° of dielectric coating filters 203 realize the conjunction partial wave function of uplink light beam and downlink light beam,
I.e. the light beam of the special wavelength of downlink such as 1490nm is reflected into the optical detection of TO-CAN encapsulation by 45 ° of dielectric coating filters 203
Device 204, the special wavelength of uplink is different from downstream wavelength, generally 1310nm, after being sent out by the TO-CAN lasers 205 encapsulated
Enter tail optical fiber 200 through overcoupling lens 201 after 45 ° of dielectric coating filters 203.
As shown in Fig. 2, plating deielectric-coating is to realize that wavelength selects on coupled lens coupled lens 201 in optical module ROSA
Sexual reflex device, can plate multilayer dielectric film on coupled lens coupled lens 201, the bandwidth of operation of deielectric-coating for 1620nm extremely
1680nm, for reflectivity more than 90%, the power attenuation of deielectric-coating is not more than 10dB.OTDR test signals are emitted from tail optical fiber 200
Reflected back into tail optical fiber 200 by the deielectric-coating reflector 202 on lens through overcoupling lens 201 after to main optical path；The optic communication
The deielectric-coating reflector 202 of the downlink working wavelength signals of system then through coupled lens 201 and thereon, and by 45 ° of deielectric-coating
Optical filter is reflected into optical detector 204 and is detected；After the uplink operation wavelength of the optical communication system is sent out from laser
Into main optical path, by 45 ° of dielectric coating filters, and deielectric-coating reflector 202 through coupled lens 201 and thereon enters tail
Fibre 200.
It should be noted that the Film Design and production technology of deielectric-coating reflector 202 on coupled lens 201 can be with
Traditional plating media film optical filters are identical.It does not need to change light channel structure inside BOSA, it is only necessary to be reflected with deielectric-coating
The coupled lens 201 of device 202 replace original coupled lens.
For the optical link measurement based on OTDR and diagnostic system, pass through built-in plating in the optical module in optical network device and be situated between
The coupled lens of plasma membrane reflector can optimize the detect and diagnose of OTDR, have at low cost, easy realization, stable and reliable for performance, field
Scape adaptability is good, the advantages of doing special operation without field maintenance person.By realizing that optical module built-in reflective device can be effective
OTDR is improved to the positioning of fiber optic network failure and the measurement capability of performance.
Optical module in the optical network device of the present embodiment is coated with the medium of deielectric-coating formation on the coupled lens of BOSA
Film reflector does not need to change the detection that OTDR can be realized in device architecture, and at low cost, saving original paper can be unified to assemble.
Fig. 3 shows the structure diagram of the ROSA of one embodiment of the invention.The component identical with Fig. 2 has identical in Fig. 3
Function, for simplicity, omit the detailed description to these components.As shown in figure 3, the ROSA optical modules mainly include：Tail
Fibre 300, coupled lens 301, optical detector 303 are wherein coated with deielectric-coating and form deielectric-coating reflector 302 on coupled lens 301,
For reflecting the test signal of detector, and can transmissive operation signal.
Specifically, the structure of ROSA can be similar with BOSA, and difference lies in ROSA, there is no lasers, only carry out downlink light
The reception of beam, therefore optical detector 303 can be arranged on main optical path.Coupled lens 301 leans on dipped beam in optical module ROSA
Deielectric-coating reflector 302 is plated on the surface of 303 side of detector.OTDR test signals pass through after being emitted to main optical path from tail optical fiber 300
Overcoupling lens 301 are reflected back by the deielectric-coating reflector 302 on lens in tail optical fiber 300；The downlink work of the optical communication system
Make the deielectric-coating reflector 302 of wavelength signals then through coupled lens 301 and thereon, and be detected into optical detector 303.
It should be noted that the design method and production technology of the deielectric-coating reflector 302 can be with ordinary flat media
Film reflector is identical, does not need to change light channel structure inside ROSA, it is only necessary to the coupled lens with deielectric-coating reflector 302
301 replace original coupled lens.
In this way, plating deielectric-coating on coupled lens in ROSA, deielectric-coating reflector is formed, does not need to change device architecture
The detection of OTDR, and at low cost, saving original paper can be realized, can unify to assemble.
Fig. 4 shows the flow chart of the optical link detection method of one embodiment of the invention.As shown in figure 4, this method is mainly wrapped
It includes：
Step S402, OTDR transmittings detection signal, detection signal reaches the coupled lens being located in optical module, by being located at light
Coupled lens in module plate the deielectric-coating of deielectric-coating formation in coupled lens on the surface of detector or laser side
Reflector reflection detects signal and forms reflection signal.
Step S404, OTDR receives reflection signal.
Step S406, OTDR determines the failure of optical link or failure is positioned according to reflection signal diagnosis optical link.
Specifically, OTDR is by emitting one or more ultrashort pulse and detected reflectance signal realization pair into optical link
The detection and positioning of optical link failure, detection rely on reflection signal in spike (reflection) or sink (attenuation), position then according to
Rely the spike in reflection signal and sagging time (time is directly proportional to position occurs).In practical application scene, it is based on
The optical link of OTDR is measured and is diagnosed mainly for detection of the decay events or reflection event in optical communication system.For example, when outer
It forces on optical cable or personnel's maloperation causes excessive fiber to be bent, decay events can be detected by OTDR at this time.When
It during fibercuts, is detected by OTDR, can detect the reflection event of the end face broken to form.
In this way, OTDR can be measured accurately by detecting the intensity of the reflected light pulse of deielectric-coating reflector
Go out from OLT to the optical link of each optical network unit and decay, and based on the strong reflection pulse of optical mode deielectric-coating reflector in the block
The historical data of intensity carries out ODN links health analysis and performance prediction.In addition, by bent in OTDR to each optical network unit
It is effectively distinguished by strong reflection event on line, so as to fulfill the positioning and measurement to wear-out failure on ODN.
The optical link detection method of the present embodiment, the coupled lens by the BOSA/ROSA in user side optical module are close
Deielectric-coating is plated on the surface of laser/optical detector side and realizes wavelength selective reflectors, the deielectric-coating reflector is at low cost,
It is of good reliability, can unify to assemble, OTDR test signals can be reflected back into in tail optical fiber and transmitted the work of the optical communication system
Make wavelength, the failure of energy detect and diagnose optical communication link.
Description of the invention provides for the sake of example and description, and is not exhaustively or will be of the invention
It is limited to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.It selects and retouches
It states embodiment and is to more preferably illustrate the principle of the present invention and practical application, and those of ordinary skill in the art is enable to manage
The solution present invention is so as to design the various embodiments with various modifications suitable for special-purpose.
Claims (10)
1. a kind of optical module in optical network device, which is characterized in that including：
Coupled lens in the optical module；
The deielectric-coating reflector of deielectric-coating formation is coated on the surface of detector side in the coupled lens, for reflecting
The test signal of detector, and transmissive operation signal.
2. optical module according to claim 1, which is characterized in that the optical module include light-receiving component ROSA and/or
Single-fiber bidirectional optical transmit-receive component BOSA.
3. optical module according to claim 2, which is characterized in that the ROSA includes：
Coupled lens in the ROSA；
The deielectric-coating reflector of deielectric-coating formation is coated on the surface of detector side in the coupled lens, for by tail
The test signal of the optical time domain reflectometer OTDR of fibre outgoing is reflected back in the tail optical fiber.
4. optical module according to claim 2, which is characterized in that the BOSA includes：
Coupled lens in the BOSA；
The deielectric-coating reflector of deielectric-coating formation is coated on the surface of detector side in the coupled lens, for by tail
The OTDR test signals of fibre outgoing are reflected back in the tail optical fiber.
5. optical module according to any one of claims 1 to 4, which is characterized in that
Multilayer dielectric film is coated on the coupled lens.
6. optical module according to claim 5, which is characterized in that
The bandwidth of operation of the deielectric-coating is set according to the test signal of OTDR, the bandwidth of operation of the deielectric-coating for 1620nm extremely
1680nm or 1595nm to 1655nm.
7. optical module according to claim 5, which is characterized in that the reflectivity of the deielectric-coating is more than 90%.
8. optical module according to claim 5, which is characterized in that the power attenuation of the deielectric-coating is not more than 10dB.
9. a kind of optical network device, which is characterized in that including：
Such as the optical module in optical network device according to any one of claims 1-8.
10. a kind of optical link detection method, which is characterized in that including：
Transmitting detection signal；
Reflection signal is received, the reflection signal is by the coupled lens that are located in optical module in the coupled lens close to detector
The deielectric-coating reflector reflection detection signal that deielectric-coating is formed is plated on the surface of side and is generated；
According to the reflection signal diagnosis optical link, determine the failure of optical link or failure is positioned.
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| CN106452568A (en) * | 2016-11-03 | 2017-02-22 | 深圳新飞通光电子技术有限公司 | OSC (Optical Supervising Channel) optical module with OTDR (Optical Time Domain Reflectometer)) function and method for realizing real-time and interruption service detection thereof |
| CN109547097A (en) * | 2017-09-22 | 2019-03-29 | 深圳市欧凌克光电科技有限公司 | A kind of optical signal launcher monitoring luminous intensity |
| CN110996193B (en) * | 2019-11-19 | 2021-10-26 | 华为技术有限公司 | Method, related device and system for identifying optical network unit connection port |
| TWM622757U (en) * | 2021-05-07 | 2022-02-01 | 光紅建聖股份有限公司 | Optical time domain reflector structure and the optical assembly thereof |
| CN116961741B (en) * | 2023-07-24 | 2024-04-02 | 尚宁光电无锡有限公司 | Optical module test and debug system based on data analysis |
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| CN102752051A (en) * | 2012-07-23 | 2012-10-24 | 青岛海信宽带多媒体技术有限公司 | Optical component of optical network unit with optical time domain reflection function |
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