CN108933624A - A kind of optical link detection method and system may pass through gain unit - Google Patents
A kind of optical link detection method and system may pass through gain unit Download PDFInfo
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- CN108933624A CN108933624A CN201811073043.7A CN201811073043A CN108933624A CN 108933624 A CN108933624 A CN 108933624A CN 201811073043 A CN201811073043 A CN 201811073043A CN 108933624 A CN108933624 A CN 108933624A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/071—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using a reflected signal, e.g. using optical time domain reflectometers [OTDR]
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Abstract
The invention belongs to fiber optic communication fields, more particularly to a kind of optical link detection method and system that may pass through gain unit, the method comprise the steps that obtaining combining light after optical signal and detecting optical pulses multiplex, it is combined light positive transmission in transmission fiber, and passes through one or more gain units in route；Part detection light pulse in combining light is reflected back toward route and forms reflection light pulse, one or more gain units in reflection light pulse by-pass, the reverse transfer in transmission fiber；Reflection light pulse enters optical time domain reflectometer after partial wave acts on, and is detected by optical time domain reflectometer to optical link.Optical link detection method and system provided by the invention, using the characteristics of non-reciprocity of circulator, so that reflection light pulse can bypass the isolator reverse transfer in gain unit, complete the normal measurement of optical link by being inserted into circulator respectively before and after gain unit；Meanwhile ensuring that optical signal forward direction is transmitted, extend detection range.
Description
[technical field]
The present invention relates to fiber optic communication fields, and in particular to a kind of optical link detection method that may pass through gain unit and is
System.
[background technique]
With the raising of the level of IT application, Fibre Optical Communication Technology is as a kind of offer large capacity, the communication party of high reliability
Formula has been greatly developed.The lightguide cable link of the reliability and stability and composition bottom bearer network of optical fiber telecommunications system
Performance is closely bound up, based on optical time domain reflectometer (Optical Time-Domain Reflectometer, be abbreviated as OTDR)
Backscattering method is with its non-destructive, high reliability and the advantages of be able to reflect whole lightguide cable link performance, at the scene in measurement
It is widely used.
OTDR be using light pulse transmit in a fiber when Rayleigh scattering and Fresnel reflection caused by backscattering
And manufactured high-tech, high-accuracy optoelectronic integration instrument.Wherein laser light source output optical pulse under driving circuit modulation,
Injecting lightguide cable link to be measured by directional optical coupler and flexible jumper becomes detecting optical pulses.Detecting optical pulses are in the line
Rayleigh scattering light and Fresnel reflected light can be being generated on the way when transmission, part reflection light pulse will be transmitted along optical fiber and be reached
The receipts optical port of the OTDR of route, oriented coupling branch directive photodetector, is transformed into electric signal, by low noise amplification and
Digital averagingization processing is finally showing processed electric signal with the trigger signal synchronous scanning extracted from light source back surface transmitting
Become reflection light pulse on wave device.The useful information of return is measured by the detector of OTDR, finally exports lightguide cable link to be measured
Loss, reflection event spatial distribution.
For overlength span lightguide cable link, in order to realize the normal communication of overlength span, need to be added one in route
The gain unit of fixed number amount.The strong optical signal of gain unit output is likely due to Rayleigh scattering or reflection event in route
And strong reflected light signal is formed, in order to avoid strong reflected light signal damages gain unit, in output end inside gain unit
It can be inserted into an isolator, guarantee that optical signal can only be transmitted to a direction.And the isolator of gain unit can also block OTDR
Detecting optical pulses reverse transfer so that traditional OTDR scheme with gain unit route in cannot achieve.With light
The transmission range of the development of the technologies such as amplifier, dispersion compensation, optical fiber telecommunications system is more and more remoter, how to have link to these
The lightguide cable link of the long range of gain unit carries out performance detection, is problem to be solved.
In consideration of it, overcoming defect present in the above-mentioned prior art is the art urgent problem to be solved.
[summary of the invention]
The technical problem to be solved in the invention is:
Existing OTDR embodiment is dfficult to apply in the overlength span lightguide cable link with gain unit, detects light arteries and veins
Punching reverse transfer difficult to bypass the isolator in gain unit, also can not just detect optical link.
The present invention reaches above-mentioned purpose by following technical solution:
In a first aspect, the present invention provides a kind of optical link detection methods that may pass through gain unit, comprising the following steps:
Combining light is obtained after optical signal and detecting optical pulses multiplex, is combined light positive transmission in transmission fiber, and wear
Cross one or more gain units in route；
Part detection light pulse in combining light is reflected back toward route and forms reflection light pulse, and reflection light pulse passes through annular
One or more gain units in device by-pass, the reverse transfer in transmission fiber；
Reflection light pulse enters optical time domain reflectometer after partial wave acts on, and is examined by optical time domain reflectometer to optical link
It surveys.
Preferably, circulator A and circulator B is respectively set before and after each gain unit, then the combining light is transmitting
Positive transmission in optical fiber, and one or more gain units in route are passed through, specifically:
The combining light is transmitted by transmission fiber forward direction, successively by circulator A, Mei Gezeng before each gain unit
Circulator B after beneficial unit and each gain unit, and optical signal amplification is completed in the gain unit, to pass through each increasing
Beneficial unit continues positive transmission.
Preferably, the reflection light pulse is being transmitted by one or more gain units in circulator by-pass
Reverse transfer in optical fiber, specifically:
When the reflection light pulse is formed in the transmission fiber before first gain unit, reflection light pulse directly exists
Reverse transfer and wavelength division multiplexer is arrived in transmission fiber；
When the reflection light pulse is formed in except the transmission fiber before first gain unit, reflection light pulse is successively
By gain unit each before the gain unit corresponding circulator B and corresponding circulator A, to bypass each gain unit
After continue the reverse transfer in transmission fiber, until arrive at wavelength division multiplexer.
Preferably, three ports are arranged in the circulator A, are followed successively by the port a1, the port a2 and the port a3 clockwise, described
Three ports are arranged in circulator B, are followed successively by the port b1, the port b2 and the port b3 clockwise；Wherein, before the port a1 and circulator A
Transmission fiber connection, the input terminal connection of the port a2 and corresponding gain unit, the output end of the port b1 and corresponding gain unit
Connection, the port b2 are connect with the transmission fiber after circulator B, and the port b3 is connect with the port a3；
When combining light forward direction is transferred through each gain unit, successively pass through the port a1, the port a2, gain unit, b1
Behind port and the port b2, continue positive transmission；
When reflection light pulse reverse transfer to each gain unit, successively pass through the port b2, the port b3, the port a3 and a1
Port, around reverse transfer is continued after corresponding gain unit.
Second aspect, the present invention also provides a kind of gain module that may pass through gain unit for optical link detection, packets
The circulator A 32 and circulator B 33 for including gain unit 31 and being located at 31 front and back of gain unit；Wherein, the increasing
Beneficial unit 31 passes through institute when transmitting optical signal forward direction for realizing optical signal amplification, the circulator A 32 and circulator B 33
When stating gain unit 31 to continue forward, and making reflection light pulse reverse transfer, continue reverse transfer around the gain unit 31.
Preferably, three ports are arranged in the circulator A 32, are followed successively by the port a1, the port a2 and the port a3 clockwise,
Three ports are arranged in the circulator B 33, are followed successively by the port b1, the port b2 and the port b3 clockwise；Wherein, the port a1 and institute
Transmission fiber connection before stating circulator A 32, the port a2 connect with the input terminal of the gain unit 31, the port b1 with it is described
The output end of gain unit 31 connects, and the port b2 is connect with the transmission fiber after the circulator B 33, the port b3 and the port a3
Connection；When so that optical signal forward direction being transmitted, successively behind the port a1, the port a2, gain unit 31, the port b1 and the port b2,
Continue positive transmission, and when reflection light pulse reverse transfer, successively pass through the port b2, the port b3, the port a3 and the port a1, bypasses
Continue reverse transfer after the gain unit 31.
The third aspect, the present invention also provides a kind of optical link detection systems that may pass through gain unit, including optical signal
Generator 1, optical time domain reflectometer 2 and the gain unit 31 in transmission optical path, the optical signal generator 1 is for generating light
Signal, the optical time domain reflectometer 2 examine optical link information according to reflection light pulse for generating detecting optical pulses
It surveys, the gain unit 31 is for realizing signal amplification；
Circulator A 32 and circulator B 33,32 He of circulator A are also respectively provided with before and after the gain unit 31
The gain unit 31 is passed through forward when circulator B 33 transmits optical signal forward direction, and makes reflection light pulse reverse transfer
When, the optical time domain reflectometer 2 is transmitted to around the gain unit 31.
Preferably, further include wavelength division multiplexer 4, be set to after the optical signal generator 1 and optical time domain reflectometer 2,
Before gain unit 31, the optical signal of forward direction transmission and detecting optical pulses multiplex are formed combining light by the wavelength division multiplexer 4, and
Partial wave is carried out to the reflection light pulse of reverse transfer.
Preferably, three ports are arranged in the circulator A 32, are followed successively by the port a1, the port a2 and the port a3 clockwise,
Three ports are arranged in the circulator B 33, are followed successively by the port b1, the port b2 and the port b3 clockwise；Wherein, the port a1 and institute
Transmission fiber connection before stating circulator A32, the port a2 are connect with the input terminal of the gain unit 31, the port b1 and the increasing
The output end of beneficial unit 31 connects, and the port b2 is connect with the transmission fiber after the circulator B33, and the port b3 and the port a3 connect
It connects.
Preferably, when combining light forward direction is transmitted to the gain unit 31, successively pass through the port a1, the port a2, gain list
Behind member 31, the port b1 and the port b2, continue positive transmission；When reflection light pulse reverse transfer to the gain unit 31, successively
By the port b2, the port b3, the port a3 and the port a1, around reverse transfer is continued after the gain unit 31.
The beneficial effects of the present invention are:
A kind of optical link detection method and system may pass through gain unit provided by the invention, can be applied to overlength span
The detection of loss measurement and reflection event in lightguide cable link.By distinguishing insertion ring before and after the gain unit of lightguide cable link
Shape device, using the characteristics of non-reciprocity of circulator, so that the reflection light pulse that detecting optical pulses are formed can bypass the gain in route
Unit reverse transfer, and the normal measurement that OTDR completes optical link is eventually entered into, the isolator in gain unit is avoided to anti-
Penetrate the obstruction of light pulse；Meanwhile may pass through after gain unit realizes amplification and continuing forward when ensuring that the transmission of optical signal forward direction,
Extend detection range.
[Detailed description of the invention]
In order to illustrate the technical solution of the embodiments of the present invention more clearly, will make below to required in the embodiment of the present invention
Attached drawing is briefly described.It should be evident that drawings described below is only some embodiments of the present invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is a kind of optical link detection method flow chart that may pass through gain unit provided in an embodiment of the present invention；
Fig. 2 is a kind of gain module structure that may pass through gain unit for optical link detection provided in an embodiment of the present invention
Schematic diagram；
Fig. 3 is a kind of structure and working principle schematic diagram of circulator provided in an embodiment of the present invention；
Fig. 4 is a kind of optical link detection system structure that may pass through gain unit provided in an embodiment of the present invention；
Fig. 5 is a kind of optical link detection system composition figure that may pass through gain unit provided in an embodiment of the present invention.
[specific embodiment]
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
In the description of the present invention, term "inner", "outside", " longitudinal direction ", " transverse direction ", "upper", "lower", "top", "bottom",
The orientation or positional relationship of the instructions such as "left", "right" is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of retouching
It states the present invention rather than requires the present invention that must be constructed and operated in a specific orientation, therefore be not construed as to of the invention
Limitation.
In addition, as long as technical characteristic involved in the various embodiments of the present invention described below is each other not
Constituting conflict can be combined with each other.Just with reference to drawings and examples, in conjunction with coming, the present invention will be described in detail below.
Embodiment 1:
The embodiment of the present invention 1 provides a kind of optical link detection method that may pass through gain unit, as shown in Figure 1, including
Following steps:
Step 201, combining light is obtained after optical signal and detecting optical pulses multiplex, is combined light positive biography in transmission fiber
It is defeated, and pass through one or more gain units in route.
Wherein, the optical signals optical signal generator generates, and optical signal load communication data information, the detection light
Pulse is generated by optical time domain reflectometer, or is formed using the optical signal more than needed that optical signal generator generates, optical signal and detection
Light pulse positive transmission in optical link, multiplex forms combining light at wavelength division multiplexer, i.e. combining light is by optical signal and spy
Survey light pulse composition, the two positive transmission in the line jointly.
Detection method described in the embodiment of the present invention is particularly suitable for the detection of the optical link in overlength span lightguide cable link, is
It realizes the normal communication of overlength span, usually requires that multiple gain units are added in route, it is in embodiments of the present invention, corresponding
Circulator A and circulator B is respectively set before and after each gain unit.The mistake of combining light positive transmission in transmission fiber
Cheng Zhong, successively the circulator B after circulator A, each gain unit and each gain unit before each gain unit, and
Optical signal amplification is completed in the gain unit, to pass through each gain unit forward direction transmission in route.Specifically, when passing
When transporting to wherein some gain unit, combining light inputs the circulator A before corresponding gain unit first, after circulator A output
Continue positive transmit and arrive at the gain unit, output continues onwards transmission entrance from the gain unit after completion optical signal amplification
Circulator B after corresponding gain unit, then exports from circulator B；When being transmitted to next gain unit, transmission process is same
On, then light is combined in turn through each gain unit in route, and forward direction is transmitted after constantly amplifying.Wherein, two type
The wavelength of the detecting optical pulses of type should all be within the gain ranging of gain unit, to guarantee that detection light can also be by gain list
Member amplification.
Step 202, the part detection light pulse being combined in light is reflected back toward route and forms reflection light pulse, reflection light pulse
By one or more gain units in circulator by-pass, the reverse transfer in transmission fiber.
Due to the presence of the Rayleigh scattering phenomenon in route and the reflection event being likely to occur, the part detection being combined in light
Light pulse can be reflected back toward the optical fiber in route and form reflection light pulse, can be used for the detection of optical link information, reflection light pulse
Will in transmission fiber reverse transfer.Since multiple gain units being arranged in route, then the process of reflection light pulse reverse transfer
There is following two situation:
When being formed in the transmission fiber before the reflection light pulse in the line first gain unit, then reflected light arteries and veins
Punching can also not influenced by isolator in gain unit, directly reversely be passed in transmission fiber without any gain unit
It is defeated and arrive at wavelength division multiplexer；
When the reflection light pulse is formed in except the transmission fiber before first gain unit, reflection light pulse is successively
By gain unit each before the gain unit corresponding circulator B and corresponding circulator A, to bypass each gain unit
After continue the reverse transfer in transmission fiber, until arrive at wavelength division multiplexer.For example, reflection light pulse third in optical link
When being formed in the transmission fiber before gain unit, it is corresponding that when reflection light pulse reverse transfer, successively passes through second gain unit
Circulator B, circulator A, the corresponding circulator B of first gain unit, circulator A, thus bypass the first two gain unit
After continue the reverse transfer in transmission fiber, until arrive at wavelength division multiplexer.
Step 203, reflection light pulse enters optical time domain reflectometer after partial wave acts on, by optical time domain reflectometer to optical link
It is detected.Specifically, partial wave is realized after reflection light pulse reverse transfer to wavelength division multiplexer, when reaching light after the effect of being allocated
Domain reflectometer, optical time domain reflectometer obtain the loss letter in optical link by analyzing received reflection light pulse
Breath and reflection event information, to complete the normal measurement of optical link.
The circulator structure used in the method for the embodiment of the present invention is specific as follows: the circulator A is arranged three
Port, is followed successively by the port a1, the port a2 and the port a3 clockwise, and the circulator B is arranged three ports, is followed successively by b1 clockwise
Port, the port b2 and the port b3；Wherein, the port a1 is connect with the transmission fiber before circulator A, the port a2 and corresponding gain unit
Input terminal connection, the output end of the port b1 and corresponding gain unit connects, the transmission fiber company after the port b2 and circulator B
Connect, the port b3 is connect with the port a3, can refer to the structure drawing of device of embodiment 2 and the system construction drawing of embodiment 3, i.e. Fig. 2 and
Fig. 4；
Then when combining light forward direction is transferred through each gain unit, i.e., when from left to right transmitting, combining light successively passes through
The port a1 of corresponding circulator A, the port a2, gain unit, the port b1 and the port b2 for corresponding to circulator B, it is every so as to pass through
A gain unit continues positive transmission；
When reflection light pulse reverse transfer to each gain unit, i.e., when transmitting from right to left, reflection light pulse is successively
By the port b2, the port b3, the port a3 and the port a1 for corresponding to circulator A of corresponding circulator B, to bypass each gain list
Continue reverse transfer after member.
A kind of optical link detection method may pass through gain unit provided by the invention, can be applied to overlength span cable line
The detection of loss measurement and reflection event in road.By being inserted into respectively before and after the gain unit of overlength span lightguide cable link
Circulator, using the characteristics of non-reciprocity of circulator, so that the reflection light pulse that detecting optical pulses are formed can bypass the increasing in route
Beneficial unit reverse transfer, and the normal measurement that OTDR completes optical link is eventually entered into, avoid the isolator pair in gain unit
The obstruction of reflection light pulse；Meanwhile ensure that optical signal forward direction transmission when may pass through gain unit realize amplification after continue to
Before, extend detection range.
Embodiment 2:
The embodiment of the present invention 2 provides a kind of gain module that may pass through gain unit for optical link detection, can be used for
In optical link detection method described in above-described embodiment 1, realize for the amplification of optical signal and forward and reverse transmission of optical signal.Specifically
Structure is as shown in Fig. 2, include gain unit 31 and the circulator A 32 and circulator B for being located at 31 front and back of gain unit
33；Wherein, the gain unit 31 makes optical signal just for realizing optical signal amplification, the circulator A32 and circulator B 33
When continuing forward to the gain unit 31 is passed through when transmission, and making reflection light pulse reverse transfer, the gain unit is bypassed
31 continue reverse transfer.
Such as Fig. 2, in the gain module, the gain unit 31 is arranged between two circulators, for realizing light
The amplification of signal, optical signal here are combined light, optical signal and detecting optical pulses including load communication data information；Institute
Stating gain unit 31 can be used erbium-doped fiber amplifier (Erbium Doped Fiber Amplifier, be abbreviated as EDFA),
Centralized raman amplifier can be used.Three ports are arranged in the circulator A 32, be followed successively by clockwise the port a1, the port a2 and
The port a3, the circulator B 33 are arranged three ports, are followed successively by the port b1, the port b2 and the port b3 clockwise；Wherein, the end a1
Mouthful connect with the transmission fiber before the circulator A32, the port a2 is connect with the input terminal of the gain unit 31, the port b1 and
The output end of the gain unit 31 connects, and the port b2 is connect with the transmission fiber after the circulator B33, the port b3 and the end a3
Mouth passes through transmission fiber and realizes connection.In figure, optical signal and detecting optical pulses are from left to right transmitted, i.e., positive transmission, and are detected
Reflection light pulse of the light pulse through reflecting to form transmits from right to left, i.e. reverse transfer, as shown by arrows in figure.Then it is combined light just
To when transmission, can successively by the port a1 of circulator A 32, the port a2, gain unit 31, circulator B 33 the port b1 and
Behind the port b2, continue positive transmission；And when reflection light pulse reverse transfer, successively pass through the port b2, the end b3 of circulator B 33
The port a3 and the port a1 of mouth, circulator A 32, around reverse transfer is continued after intermediate gain unit 31.
Wherein, the structure and working principle of circulator is specific as follows in gain module: the circulator is a kind of with non-
The multi-branch transport system of reciprocity property, as shown in figure 3, signal can only be along one direction annular delivery and defeated from one of port
Out, and opposite direction is isolation, specifically: when signal is inputted by any port, with the port clockwise adjacent or inverse
The adjacent next port of hour hands is signal output port, and remaining a port is isolated port, not output signal；Specifically
Signal unidirectional loop transmission along clockwise direction or the transmission of counter clockwise direction unidirectional loop are determined by bias field.
Common circulator is ferrite circulator, is a kind of Y-junction circulator, as shown in Fig. 3 left figure, is mutually by three
The symmetrical branch line of hexagonal angle is constituted.Its working principle is specific as follows: when externally-applied magnetic field is zero, ferrite is not by magnetic
Change, thus the magnetism in all directions be it is identical, then when 1. signal is inputted from branch line, will ferrite tie excitation such as
Magnetic field shown in Fig. 3 middle graph, due to branch, 2., 3. magnetic field condition is identical, and signal is equal part output, i.e., signal can be from branch
2., 3. branch exports respectively.When additional suitable magnetic field, ferrite magnetization, due to anisotropic effect, in ferrite knot
Upper excitation electromagnetic field as shown in Fig. 3 right figure, then 2. there is signal output at place for branch, and 3. it is zero that branch locates electric field, without signal
Output；Similarly, by branch 2. input signal when, 3. there is output in branch, and branch is 1. without output；By branch's 3. input signal
When, 1. there is output in branch, and branch is 2. without output.As it can be seen that signal transmission constitutes 1. → 2. → 3. → 1. counterclockwise unidirectional
It goes in ring and circulates, and be reversely obstructed.Similarly, when changing the direction of bias magnetic field, circumferential direction will change, then signal
Transmission will constitute 1. → 3. → 2. → unidirectional circulation of going in ring counterclockwise 1., and reversed obstructed, therefore become circulator.
In embodiments of the present invention, the circulator A and circulator B is all made of iron oxygen of the above-mentioned tool there are three branched structure
Body circulator, such as Fig. 2, wherein to realize that combining light from left to right positive transmission, reflection light pulse can be passed reversely from right to left
Defeated, the embodiment of the present invention is by the additional suitable magnetic field of circulator, so that when signal is inputted by one of port, with the end
The next port of mouth clockwise adjacent is signal output port, and remaining a port is isolated port.It is specific as follows:
In the circulator A, signal is along the port the a1 → port a2 → port a3 direction clockwise transmission, in the circulator B,
Signal is along the port the b1 → port b2 → port b3 direction clockwise transmission.It is then combined light forward direction and is transmitted to the gain module
When, combining light is exported from the port a2 is closely lossless (without exporting from the port a3), by institute after being entered by the port a1 of circulator A
After stating gain unit 31, exported from the port b2 is closely lossless (without being exported from the port b3) after being entered by the port b1 of circulator B,
Continue positive transmission；When reflection light pulse reverse transfer to the gain module, by the circulator B the port b2 enter and from
The port b3 output (without exporting from the port b2), enters by the transmission of transmission fiber, then by the port a3 of the circulator A
And from the output of the port a1 (without being exported from the port a2), thus around reverse transfer is continued after the gain unit 31.
A kind of gain module may pass through gain unit for optical link detection provided by the invention, by gain unit
Circulator is inserted into front and back respectively, using the characteristics of non-reciprocity of circulator, so that the reflection light pulse that is formed of detecting optical pulses can be around
The gain unit reverse transfer in route is crossed, obstruction of the isolator in gain unit to reflection light pulse is avoided；Simultaneously again
It may pass through after gain unit realizes amplification and continue forward when can guarantee the transmission of optical signal forward direction.The gain module can be applied to overlength
In span lightguide cable link, for realizing the loss measurement of optical link and the detection of reflection event, and detection range can guarantee.
Embodiment 3:
The embodiment of the present invention 3 provides a kind of optical link detection system that may pass through gain unit, which can be used for reality
Detection method described in current embodiment 1, as shown in figure 4, the detection system includes optical signal generator 1, optical time domain reflection
Instrument 2 and the gain unit 31 in transmission optical path, for the optical signal generator 1 for generating optical signal, the optical time domain is anti-
Instrument 2 is penetrated for generating detecting optical pulses, and optical link information is detected according to reflection light pulse, the gain unit 31 is used
In realization signal amplification；
Circulator A 32 and circulator B 33,32 He of circulator A are also respectively provided with before and after the gain unit 31
The gain unit 31 is passed through forward when circulator B 33 transmits optical signal forward direction, and makes reflection light pulse reverse transfer
When, the optical time domain reflectometer 2 is transmitted to around the gain unit 31.
A kind of optical link detection method and system may pass through gain unit provided by the invention, can be applied to overlength span
The detection of loss measurement and reflection event in lightguide cable link.By dividing before and after the gain unit of overlength span lightguide cable link
Not Cha Ru circulator, using the characteristics of non-reciprocity of circulator, so that the reflection light pulse that detecting optical pulses are formed can bypass route
In gain unit reverse transfer, and eventually enter into OTDR complete optical link normal measurement, avoid in gain unit every
Obstruction from device to reflection light pulse；Meanwhile after may pass through gain unit realization amplification when ensuring that the transmission of optical signal forward direction
Continue forward, to extend detection range.
Wherein, 33 three of circulator A 32 and circulator B of gain unit 31 described in the embodiment of the present invention and its front and back
It combines, is equivalent to gain module described in embodiment 2, and can realize the identical function of the gain module, therefore,
System construction drawing as shown in Figure 4 can also be expressed as shown in Figure 5, wherein label 3 is gain mould described in embodiment 2
Block.Therefore it may also be said that in gain module described in embodiment 2 each unit working principle, be equally applicable to this hair
Gain unit 31, circulator A 32 and circulator B 33 in bright embodiment.
As Fig. 4 and Fig. 5 remove the optical signal generator in the present embodiment in a complete optical link detection system
It 1, further include wavelength division multiplexer 4, and entire outside optical time domain reflectometer 2, gain unit 31, circulator A32 and circulator B 33
In route, one or more is arranged in the gain unit 31, and successively successively arrangement, to extend transmission distance and detection range.
Wherein, the optical signal generator 1 is used to generate the optical signal of load communication data information, and the optical time domain reflectometer 2 is used for
Detecting optical pulses are generated, and receive the reflection light pulse being reflected back in detecting optical pulses, by the reflection light pulse received
It is detected, obtains the loss information and reflection event information in optical link, to complete the normal measurement of optical link.The wave
Division multiplexer 4 is set to the optical signal generator 1 with after optical time domain reflectometer 2, is mainly used for partial wave and multiplex, here
For by forward direction transmission optical signal and detecting optical pulses multiplex formed combining light, while to the reflection light pulse of reverse transfer into
Row partial wave, one or more of gain units 31 are successively set on after the partial wave multiplexer 4, are carried out by transmission fiber
The transmission of signal light, corresponding each 31 front and back of gain unit are respectively arranged with the circulator A 32 and circulator B 33.Its
Described in optical signal generator 1 can using the fast science and technology of light RTXM298-301 transceiver module in emitting portion, when described smooth
Domain reflectometer 2 can be using the OTDR module in the PON-OTDR board of the fast science and technology of light.Detecting optical pulses are except through the light
Outside time-domain reflectomer 2 generates, it can also be formed by the optical signal more than needed that the optical signal generator 1 generates, and above two
The wavelength of the detecting optical pulses of type should all be within the gain ranging of the gain unit 31, so that guaranteeing to detect light can be by
The gain unit 31 amplifies.
Such as Fig. 4, the gain unit 31 is arranged between two circulators, for realizing the amplification of optical signal, here
Optical signal is combined light, optical signal and detecting optical pulses including load communication data information；The gain unit 31 can be adopted
With erbium-doped fiber amplifier (Erbium Doped FiberAmplifier, be abbreviated as EDFA), centralized Raman can also be used and put
Big device.Three ports are arranged in the circulator A 32, are followed successively by the port a1, the port a2 and the port a3, the circulator B clockwise
33 three ports of setting, are followed successively by the port b1, the port b2 and the port b3 clockwise；Wherein, before the port a1 and the circulator A32
Transmission fiber connection, the port a2 connect with the input terminal of the gain unit 31, and the port b1 is defeated with the gain unit 31
Outlet connection, the port b2 are connect with the transmission fiber after the circulator B 33, and the port b3 and the port a3 pass through transmission fiber reality
Now connect.The circulator is a kind of multi-branch transport system with characteristics of non-reciprocity, and signal can only be along one direction annular delivery
And exported from one of port, and opposite direction is isolation, concrete operating principle has been introduced in example 2, herein not
It repeats again.
Through the working principle of previously described circulator it is found that in the optical signal transmission of the embodiment of the present invention, in institute
It states in circulator A, signal is along the port the a1 → port a2 → port a3 direction clockwise transmission, in the circulator B, letter
Number along the port the b1 → port b2 → port b3 direction clockwise transmission.Combining light forward direction is transmitted to the gain unit 31
When, it is combined after light is entered by the port a1 of circulator A from the closely lossless output in the port a2, after the gain unit 31, by ring
From the closely lossless output in the port b2 after the port the b1 entrance of shape device B, continue positive transmission；Reflection light pulse reverse transfer is to the increasing
When beneficial unit 31, is entered by the port b2 of the circulator B and exported from the port b3, by the transmission of transmission fiber, then by institute
The port a3 for stating circulator A enters and exports from the port a1, to pass through around reverse transfer is continued after the gain unit 31
It is transmitted to the optical time domain reflectometer 2 after the partial wave effect of the wavelength division multiplexer 4, completes the detection of optical link.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (10)
1. a kind of optical link detection method that may pass through gain unit, which comprises the following steps:
Combining light is obtained after optical signal and detecting optical pulses multiplex, is combined light positive transmission in transmission fiber, and pass through line
One or more gain units in road；
Combining light in part detection light pulse be reflected back toward route formed reflection light pulse, reflection light pulse by circulator around
Cross one or more gain units in route, the reverse transfer in transmission fiber；
Reflection light pulse enters optical time domain reflectometer after partial wave acts on, and is detected by optical time domain reflectometer to optical link.
2. the optical link detection method according to claim 1 that may pass through gain unit, which is characterized in that each gain list
Circulator A and circulator B is respectively set in first front and back, then the combining light positive transmission in transmission fiber, and passes through route
In one or more gain units, specifically:
The combining light is transmitted by transmission fiber forward direction, successively by circulator A, each gain list before each gain unit
Circulator B after first and each gain unit, and optical signal amplification is completed in the gain unit, to pass through each gain list
Member continues positive transmission.
3. the optical link detection method according to claim 2 that may pass through gain unit, which is characterized in that the reflected light
Pulse is by one or more gain units in circulator by-pass, the reverse transfer in transmission fiber, specifically:
When the reflection light pulse is formed in the transmission fiber before first gain unit, reflection light pulse is directly being transmitted
Reverse transfer and wavelength division multiplexer is arrived in optical fiber；
When the reflection light pulse is formed in except the transmission fiber before first gain unit, reflection light pulse successively passes through
The corresponding circulator B and corresponding circulator A of each gain unit before the gain unit, thus subsequent around each gain unit
Continue the reverse transfer in transmission fiber, until arriving at wavelength division multiplexer.
4. the optical link detection method according to claim 1 to 3 that may pass through gain unit, which is characterized in that described
Three ports are arranged in circulator A, are followed successively by the port a1, the port a2 and the port a3 clockwise, and three ends are arranged in the circulator B
Mouthful, it is followed successively by the port b1, the port b2 and the port b3 clockwise；Wherein, the port a1 is connect with the transmission fiber before circulator A, a2
Port is connected with the input terminal of corresponding gain unit, and the port b1 is connected with the output end of corresponding gain unit, the port b2 and annular
Transmission fiber connection after device B, the port b3 is connect with the port a3；
When combining light forward direction is transferred through each gain unit, successively pass through the port a1, the port a2, gain unit, the port b1
Behind the port b2, continue positive transmission；
When reflection light pulse reverse transfer to each gain unit, successively pass through the port b2, the port b3, the port a3 and the end a1
Mouthful, around reverse transfer is continued after corresponding gain unit.
5. a kind of gain module that may pass through gain unit for optical link detection, which is characterized in that including gain unit (31)
And it is located at circulator A (32) and circulator B (33) before and after the gain unit (31)；Wherein, the gain unit
(31) it is passed through when transmitting optical signal forward direction for realizing optical signal amplification, the circulator A (32) and circulator B (33) described
Gain unit (31) continues forward, and when making reflection light pulse reverse transfer, continue reversed pass around the gain unit (31)
It is defeated.
6. the gain module according to claim 5 that may pass through gain unit for optical link detection, which is characterized in that institute
It states circulator A (32) and three ports is set, be followed successively by the port a1, the port a2 and the port a3 clockwise, the circulator B (33) sets
Three ports are set, are followed successively by the port b1, the port b2 and the port b3 clockwise；Wherein, before the port a1 and the circulator A (32)
Transmission fiber connection, the port a2 are connect with the input terminal of the gain unit (31), the port b1 and the gain unit (31)
Output end connection, the port b2 are connect with the transmission fiber after the circulator B (33), and the port b3 is connect with the port a3；So that light
When signal forward direction is transmitted, successively behind the port a1, the port a2, gain unit (31), the port b1 and the port b2, continue positive pass
It is defeated, and when reflection light pulse reverse transfer, successively pass through the port b2, the port b3, the port a3 and the port a1, bypasses the gain list
First (31) continue reverse transfer afterwards.
7. a kind of optical link detection system that may pass through gain unit, which is characterized in that when including optical signal generator (1), light
Domain reflectometer (2) and the gain unit (31) in transmission optical path, the optical signal generator (1) are used to generate optical signal,
The optical time domain reflectometer (2) is detected optical link information according to reflection light pulse, institute for generating detecting optical pulses
Gain unit (31) is stated for realizing signal amplification；
Circulator A (32) and circulator B (33), the circulator A (32) are also respectively provided with before and after the gain unit (31)
The gain unit (31) are passed through forward when transmitting optical signal forward direction with circulator B (33), and make reflection light pulse reversed
When transmission, the optical time domain reflectometer (2) are transmitted to around the gain unit (31).
8. the optical link detection system according to claim 7 that may pass through gain unit, which is characterized in that further include wavelength-division
Multiplexer (4) is set to after the optical signal generator (1) and optical time domain reflectometer (2), before gain unit (31), institute
It states wavelength division multiplexer (4) and the optical signal of forward direction transmission and detecting optical pulses multiplex is formed into combining light, and to the anti-of reverse transfer
It penetrates light pulse and carries out partial wave.
9. the optical link detection system according to claim 7 that may pass through gain unit, which is characterized in that the circulator
Three ports are arranged in A (32), are followed successively by the port a1, the port a2 and the port a3 clockwise, and three ends are arranged in the circulator B (33)
Mouthful, it is followed successively by the port b1, the port b2 and the port b3 clockwise；Wherein, the port a1 and the transmission fiber before the circulator A (32)
Connection, the port a2 are connect with the input terminal of the gain unit (31), and the output end of the port b1 and the gain unit (31) connects
It connects, the port b2 is connect with the transmission fiber after the circulator B (33), and the port b3 is connect with the port a3.
10. according to any optical link detection system that may pass through gain unit of claim 7-9, which is characterized in that close
When road light forward direction is transmitted to the gain unit (31), successively by the port a1, the port a2, gain unit (31), the port b1 and
Behind the port b2, continue positive transmission；When reflection light pulse reverse transfer to the gain module (3), successively pass through the port b2, b3
Reverse transfer is continued around the gain unit (31) in port, the port a3 and the port a1 afterwards.
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| CN201811073043.7A CN108933624A (en) | 2018-09-14 | 2018-09-14 | A kind of optical link detection method and system may pass through gain unit |
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| CN101515698A (en) * | 2009-03-18 | 2009-08-26 | 中国电子科技集团公司第三十四研究所 | A remote pump optic fiber amplifying module |
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| CN101515698A (en) * | 2009-03-18 | 2009-08-26 | 中国电子科技集团公司第三十四研究所 | A remote pump optic fiber amplifying module |
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| CN104009794A (en) * | 2013-02-22 | 2014-08-27 | 中兴通讯股份有限公司 | Method and apparatus for detecting fault in optical fiber of passive optical network |
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Application publication date: 20181204 |