CN104301026A - Optical amplifier and method of protecting optical-fiber circuit thereof - Google Patents
Optical amplifier and method of protecting optical-fiber circuit thereof Download PDFInfo
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- CN104301026A CN104301026A CN201310298718.9A CN201310298718A CN104301026A CN 104301026 A CN104301026 A CN 104301026A CN 201310298718 A CN201310298718 A CN 201310298718A CN 104301026 A CN104301026 A CN 104301026A
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Abstract
The invention discloses an optical amplifier and a method of protecting an optical-fiber circuit thereof, and relates to the field of fiber optical communication technologies. The optical amplifier comprises two ways of variable optical attenuators, optical switches which are correspondingly connected to the two ways of variable optical attenuators, optical amplification modules which are connected to the optical switches, optical couplers/optical splitters which are connected to the optical amplification modules, two optical attenuator luminous power detection points which are used for respectively monitoring optical signal power of the two ways of variable optical attenuators, and a controller which is used for adjusting the variable optical attenuators according to luminous power data obtained by monitoring through the optical attenuator luminous power detection points, judging whether a work route has a fault according to the luminous power data and controlling the optical switches to switch to an alternate routing. An OLP (Optical Line Protection) function is integrated in the optical amplifier, degradation of the OLP function on the performance of a light transmission system is minimized, the luminous power level of an outer output port is consistent to the light transmission system without OLP design, and the security hidden trouble on the system and the human body can be reduced.
Description
Technical field
The present invention relates to technical field of optical fiber communication, particularly a kind of image intensifer and fibre circuit guard method thereof.
Background technology
Due to the distinctive high-speed wideband transmittability of optical fiber, fiber optic transmission system has become (comprising optical wavelength-division multiplex (Wavelength Division Multiplexing, WDM) transmission system) technical way of current information transmission.And fibre circuit interrupts being the most most common failure that fiber optic transmission system faces; respective protected mode has all been developed at present at the every aspect of communication network; pretection switch (be called for short OLP(Optical Line Protection, fibre circuit is protected) based on fibre circuit) be fiber optic transmission system reply optical-fiber line fault be the protected mode that efficiency is high, cost is low.
Current OLP obtains certain application in the operator network; Fig. 1 illustrates traditional OLP operation principle schematic diagram; as shown in Fig. 1 illustrates; OLP is operated in two adjacent image intensifer (Optical Amplifier; OA) between (or between transmitter Tx and receiver Rx), after prime OA, " two " module is connected, through work and protection two routes; from Work route or the light signal protecting route, rear class OA is entered by " choosing is received " model choice.At present no matter OLP unit has third party to provide provides two kinds of modes with optical transmission system supplier, but the mode that these two kinds of modes all adopt OLP unit external, and illustrate that shown 1 ~ 8 all reference points are external interface as Fig. 1.The advantage of this OLP application mode is that each light section of putting can arrange independently pretection switch ability, under multiple light section of putting exists the condition of line fault simultaneously, can still ensure the survivability of transmission system.
This traditional OLP faces following problem:
(1) external OLP unit is equivalent to add extra optical signal loss on the line, and according to the operation principle of OLP unit, current excess loss is minimum also between 3.5dB ~ 4.0dB.No matter for point-to-point transmission system or the long-haul transmission system of OA cascade, the performance degradation that OLP excess loss is brought is all significant.If transmission system is not by band OLP system, now then the OLP such as optical switch, optical splitter assembly will introduce excess loss, if suppose, each light section of putting all adopts external OLP, then system acceptance OSNR will reduce at least 3.5 ~ 4dB, most system is caused to open, even if minority system can be opened, system margin also remains little.
(2) due to the excess loss that OLP unit brings, in order to ensure transmission range, the input power of reference point 2 must be increased, compensating OLP excess loss; Particularly in WDM long-haul transmission system when not considering that OLP protects OA power output usually to reach about 20dBm even higher; if the excess loss of OLP need be considered; also the power of more than 3.5dB will be increased; the then high power of reference point 2; not only serious nonlinear effect can be brought, and all potential safety hazard will be produced to equipment and the person.
(3) OLP judges whether to switch according to received optical power at present, and in the long-term scene of multistage OLP application of the manystage cascade connection, the received power that can cause subordinate OLP in prime OLP reversed process is abnormal, there is the possibility of by mistake switching.
In a word, there is deteriorated transmission system performance and the shortcoming such as introducing equipment and personal safety hidden danger in traditional external OLP modularity.
Summary of the invention
The present inventor finds to have problems in above-mentioned prior art, and therefore proposes a kind of new technical scheme at least one problem in described problem.
An object of the present invention is to provide a kind of technical scheme for fibre circuit protection.
According to a first aspect of the invention, provide a kind of image intensifer for Optical Fiber Transmission, comprising:
Two-way variable optical attenuator;
1 × 2 optical switch that connect corresponding to two-way variable optical attenuator;
The light amplification module be connected with optical switch;
1:2 optical coupler/the optical splitter be connected with light amplification module;
Two optical attenuator luminous power test points, for monitoring the optical signal power of two-way variable optical attenuator respectively;
Controller, is connected with light amplification module with variable optical attenuator, optical switch, optical attenuator luminous power test point respectively; For the luminous power data obtained according to the monitoring of optical attenuator luminous power test point, regulate variable optical attenuator; Judge that Work route breaks down according to the luminous power data that the monitoring of optical attenuator luminous power test point obtains, control optical switch and be switched to alternate routing.
Alternatively, image intensifer is used for east orientation structure; Variable optical attenuator is input port variable optical attenuator; Optical attenuator luminous power test point is input port luminous power test point, between variable optical attenuator and optical switch; What be connected with light amplification module is 1:2 light optical splitter.
Alternatively, this image intensifer also comprises: the output port optical power monitoring point between light amplification module and light optical splitter, for the output optical signal power of Real-Time Monitoring output port, feeds back to controller to control image intensifer operating state.
Alternatively, image intensifer is used for the east of west to structure; Variable optical attenuator is input port variable optical attenuator; Optical attenuator luminous power test point as input port luminous power test point between variable optical attenuator and optical switch; What be connected with light amplification module is 1:2 optical coupler/optical splitter.
Alternatively, this image intensifer also comprises: the output port optical power monitoring point between light amplification module and optical coupler/optical splitter, for the output optical signal power of Real-Time Monitoring input port, feeds back to controller to control image intensifer operating state.
Alternatively, controller is for realizing the internal control function of light amplification module.
According to a further aspect in the invention, provide a kind of and use above-mentioned image intensifer to carry out fibre circuit guard method, comprising:
The optical signal power that optical attenuator luminous power test point Real-Time Monitoring variable optical attenuator exports;
The optical signal power that controller obtains according to the monitoring of optical attenuator luminous power test point, regulates variable optical attenuator;
The luminous power data that controller obtains according to the monitoring of optical attenuator luminous power test point judge that Work route breaks down, and control optical switch and are switched to alternate routing.
Alternatively, image intensifer is used for east orientation structure; Variable optical attenuator is input port variable optical attenuator; Optical attenuator luminous power test point is input port luminous power test point, between variable optical attenuator and optical switch; What be connected with light amplification module is 1:2 light optical splitter; The method also comprises:
By the output optical signal power of the output port optical power monitoring point Real-Time Monitoring output port between light amplification module and light optical splitter, feed back to controller to control image intensifer operating state.
Alternatively, image intensifer is used for the east of west to structure; Variable optical attenuator is input port variable optical attenuator; Optical attenuator luminous power test point as input port luminous power test point between variable optical attenuator and optical switch; What be connected with light amplification module is 1:2 optical coupler/optical splitter; The method also comprises:
Output port optical power monitoring point between light amplification module and optical coupler, for the output optical signal power of Real-Time Monitoring input port, feeds back to controller to control image intensifer operating state.
Alternatively, the method also comprises: controller is for realizing the internal control function of light amplification module.
An advantage of the present invention is, is integrated with OLP function, take into account in the indoor design of image intensifer by OLP excess loss in image intensifer inside, is down to minimum by the deterioration of OLP function to optical transmission system performance; The inner integrated OLP function of image intensifer, the optical power levels of external output port is consistent with the optical transmission system designed without OLP, reduces the safety risks to system and the person, and improves fiber optic transmission system performance.
By referring to the detailed description of accompanying drawing to exemplary embodiment of the present invention, further feature of the present invention and advantage thereof will become clear.
Accompanying drawing explanation
What form a part for specification drawings describes embodiments of the invention, and together with the description for explaining principle of the present invention.
With reference to accompanying drawing, according to detailed description below, clearly the present invention can be understood, wherein:
Fig. 1 illustrates traditional OLP operation principle schematic diagram.
Fig. 2 illustrates the structure chart of an embodiment according to image intensifer of the present invention.
Fig. 3 illustrates the structure chart of another embodiment according to image intensifer of the present invention.
Fig. 4 illustrates the flow chart of an embodiment according to fibre circuit guard method of the present invention.
Embodiment
Various exemplary embodiment of the present invention is described in detail now with reference to accompanying drawing.It should be noted that: unless specifically stated otherwise, otherwise positioned opposite, the numerical expression of the parts of setting forth in these embodiments and step and numerical value do not limit the scope of the invention.
Meanwhile, it should be understood that for convenience of description, the size of the various piece shown in accompanying drawing is not draw according to the proportionate relationship of reality.
Illustrative to the description only actually of at least one exemplary embodiment below, never as any restriction to the present invention and application or use.
May not discuss in detail for the known technology of person of ordinary skill in the relevant, method and apparatus, but in the appropriate case, described technology, method and apparatus should be regarded as a part of authorizing specification.
In all examples with discussing shown here, any occurrence should be construed as merely exemplary, instead of as restriction.Therefore, other example of exemplary embodiment can have different values.
It should be noted that: represent similar terms in similar label and letter accompanying drawing below, therefore, once be defined in an a certain Xiang Yi accompanying drawing, then do not need to be further discussed it in accompanying drawing subsequently.
There is provided a kind of Novel double end mouth image intensifer of built in light route protection function herein, this Novel double end mouth image intensifer comprises: two-way variable optical attenuator (Variable Optical Attenuator, VOA); 1 × 2 optical switch that connect corresponding to two-way variable optical attenuator; The light amplification module be connected with optical switch; 1:2 optical coupler/the optical splitter be connected with light amplification module; Two optical attenuator luminous power test points, for monitoring the optical signal power of two-way variable optical attenuator respectively; Controller, is connected with light amplification module with variable optical attenuator, optical switch, optical attenuator luminous power test point respectively; For the luminous power data obtained according to the monitoring of optical attenuator luminous power test point, regulate variable optical attenuator; Judge that Work route breaks down according to the luminous power data that the monitoring of optical attenuator luminous power test point obtains, control optical switch and be switched to alternate routing.Novel double end mouth image intensifer is by the mode of built-in OLP functional unit, OLP function is integrated with in image intensifer inside, OLP excess loss take into account in the indoor design of image intensifer by the design of integration, is down to minimum by the deterioration of OLP function to optical transmission system performance; The inner integrated OLP function of image intensifer, the optical power levels of external output port is completely the same with the optical transmission system designed without OLP, reduces the safety risks to system and the person, avoids the risk factors that traditional OLP exists, and improve fiber optic transmission system performance.
Fig. 2 illustrates the structure chart of an embodiment according to image intensifer of the present invention.Fig. 2 gives the structure to east orientation, and wherein, variable optical attenuator is input port variable optical attenuator 21; Optical attenuator luminous power test point is input port luminous power test point 26, between input port variable optical attenuator 21 and optical switch 22; What be connected with light amplification module 23 is 1:2 light optical splitter 24.
As shown in Figure 2, input port variable optical attenuator 21, for adjust each optical line by overall losses, ensure the consistency of transmission system performance before and after pretection switch.
Input port luminous power test point 26, for the input optical signal power of each input port of Real-Time Monitoring, feeds back to controller 25 as the foundation adjusting input port VOA21 and pretection switch action.
1 × 2 optical switch 22, for selecting suitable route, performs pretection switch operation
Light amplification module 23, possesses the function of traditional image intensifer, and wherein control section function can complete in controller 25
Output port optical power monitoring point 27, for the output optical signal power of Real-Time Monitoring output port, feeds back to controller 25 as monitoring and the foundation optimizing image intensifer operating state
1:2 optical coupler/optical splitter 24, is divided into 2 tunnels by a road light signal, be input to different optical line by.
Controller 25 is brains of whole novel multiport image intensifer, major function includes but not limited to as follows: the luminous power data obtained according to input port optical power monitoring point 26, by regulating input port variable optical attenuator 21, ensure that image intensifer is all in optimum Working for every bar route; When the data obtained according to input port optical power monitoring point 26 judge that Work route breaks down, control optical switch 22 and be switched to normal alternate routing fast.The internal control function of light amplification module 23 also can be realized by controller 25.
Built-in OLP assembly makes to be down to minimum to the deterioration of systematic function.According to noise of optical amplifier coefficient (NF) cascaded computation formula NF=NF1+ (NF2-1)/G1, the first order is light amplification module, G1 is usually very large, generally at more than 22dB, the second level is coupler/splitter, and passive device NF equals noise factor, gain is negative insertion loss, according to above-mentioned formula, the closely NF1 of the NF after cascade is that is minimum on the impact of noise figure of amplifier performance after built-in OLP assembly.
Fig. 3 illustrates the structure chart of another embodiment according to image intensifer of the present invention.Fig. 3 give to the east of west to structure; Variable optical attenuator is input port variable optical attenuator 31; Optical attenuator luminous power test point is input port luminous power test point 36, between input port variable optical attenuator 31 and optical switch 32; What be connected with light amplification module 33 is 1:2 light optical splitter 34.
As shown in Figure 3, input port variable optical attenuator 31, for adjust each optical line by overall losses, ensure the consistency of transmission system performance before and after pretection switch.
Input port luminous power test point 36, for the input optical signal power of each input port of Real-Time Monitoring, feeds back to controller 35 as the foundation adjusting input port VOA31 and pretection switch action.
1 × 2 optical switch 32, for selecting suitable route, performs pretection switch operation
Light amplification module 33, possesses the function of traditional image intensifer, and wherein control section function can complete in controller 35
Output port optical power monitoring point 37, for the output optical signal power of Real-Time Monitoring output port, feeds back to controller 35 as monitoring and the foundation optimizing image intensifer operating state
1:2 optical coupler/optical splitter 34, is divided into 2 tunnels by a road light signal, be input to different optical line by.
Controller 35 is brains of whole novel multiport image intensifer, major function includes but not limited to as follows: the luminous power data obtained according to input port optical power monitoring point 36, by regulating input port variable optical attenuator 31, ensure that image intensifer is all in optimum Working for every bar route; When the data obtained according to input port optical power monitoring point 36 judge that Work route breaks down, control optical switch 32 and be switched to normal alternate routing fast.The internal control function of light amplification module 33 also can be realized by controller 35.
Fig. 4 illustrates the flow chart of an embodiment according to fibre circuit guard method of the present invention.
As shown in Figure 4, step 402, the optical signal power that optical attenuator luminous power test point Real-Time Monitoring variable optical attenuator exports, feeds back to the foundation of controller as VOA21 and pretection switch action.
Step 404, the optical signal power that controller obtains according to the monitoring of optical attenuator luminous power test point, regulates variable optical attenuator, adjust each optical line by overall losses, ensure the consistency of transmission system performance before and after pretection switch.
Step 406, the luminous power data that controller obtains according to the monitoring of optical attenuator luminous power test point judge that Work route breaks down, and control optical switch and are switched to alternate routing.
In one embodiment, image intensifer is used for east orientation structure; Variable optical attenuator is input port variable optical attenuator; Optical attenuator luminous power test point is input port luminous power test point, between variable optical attenuator and described optical switch; What be connected with light amplification module is 1:2 light optical splitter; Guard method also comprises: by the output optical signal power of the output port optical power monitoring point Real-Time Monitoring output port between light amplification module and light optical splitter, feed back to controller to control image intensifer operating state.
In one embodiment, image intensifer is used for the east of west to structure; Variable optical attenuator is input port variable optical attenuator; Optical attenuator luminous power test point is input port luminous power test point, between variable optical attenuator and described optical switch; What be connected with light amplification module is 1:2 light optical splitter; Guard method also comprises: by the output optical signal power of the output port optical power monitoring point Real-Time Monitoring output port between light amplification module and light optical splitter, feed back to controller to control image intensifer operating state.
Compared with the external OLP mode of tradition, technical scheme of the present disclosure possesses following advantage:
(1) high-performance: built-in OLP assembly is later minimum on the impact of noise figure of amplifier performance, makes to be down to minimum to the deterioration of systematic function.
(2) low-risk: the high risk factor of external OLP assembly is mainly derived from the extra attenuation brought to compensate OLP assembly, the raising of the Output optical power of image intensifer external output port.The built-in OLP assembly of Novel double end mouth image intensifer, Output optical power be not with OLP system completely the same, avoid potential safety hazard.
(3) low cost: fibre circuit protection is that reply bottom optical fiber cable fault is the most direct, the protected mode of least cost, tackles modal optical-fiber line fault and has advantageous advantage.
So far, described in detail according to image intensifer of the present invention and fibre circuit guard method thereof.In order to avoid covering design of the present invention, details more known in the field are not described.Those skilled in the art, according to description above, can understand how to implement technical scheme disclosed herein completely.
Method and system of the present invention may be realized in many ways.Such as, any combination by software, hardware, firmware or software, hardware, firmware realizes method and system of the present invention.Said sequence for the step of described method is only to be described, and the step of method of the present invention is not limited to above specifically described order, unless specifically stated otherwise.In addition, in certain embodiments, can be also record program in the recording medium by the invention process, these programs comprise the machine readable instructions for realizing according to method of the present invention.Thus, the present invention also covers the recording medium stored for performing the program according to method of the present invention.
Although be described in detail specific embodiments more of the present invention by example, it should be appreciated by those skilled in the art, above example is only to be described, instead of in order to limit the scope of the invention.It should be appreciated by those skilled in the art, can without departing from the scope and spirit of the present invention, above embodiment be modified.Scope of the present invention is limited by claims.
Claims (10)
1. for an image intensifer for Optical Fiber Transmission, it is characterized in that, comprising:
Two-way variable optical attenuator;
1 × 2 optical switch that connect corresponding to described two-way variable optical attenuator;
The light amplification module be connected with optical switch;
1:2 optical coupler/the optical splitter be connected with described light amplification module;
Two optical attenuator luminous power test points, for monitoring the optical signal power of variable optical attenuator described in two-way respectively;
Controller, is connected with described light amplification module with described variable optical attenuator, described optical switch, described optical attenuator luminous power test point respectively; For the luminous power data obtained according to described optical attenuator luminous power test point monitoring, regulate described variable optical attenuator; Break down according to the luminous power data determination Work route that described optical attenuator luminous power test point monitoring obtains, control described optical switch and be switched to alternate routing.
2. image intensifer according to claim 1, is characterized in that, described image intensifer is used for east orientation structure; Described variable optical attenuator is input port variable optical attenuator; Described optical attenuator luminous power test point as input port luminous power test point between described variable optical attenuator and described optical switch; What be connected with described light amplification module is 1:2 optical coupler/optical splitter.
3. image intensifer according to claim 2, is characterized in that, also comprises:
Output port optical power monitoring point between described light amplification module and described optical coupler/optical splitter, for the output optical signal power of Real-Time Monitoring output port, feeds back to described controller to control described image intensifer operating state.
4. image intensifer according to claim 1, is characterized in that, described image intensifer is used for the east of west to structure; Described variable optical attenuator is input port variable optical attenuator; Described optical attenuator luminous power test point as input port luminous power test point between described variable optical attenuator and described optical switch; What be connected with described light amplification module is 1:2 optical coupler/optical splitter.
5. image intensifer according to claim 4, is characterized in that, also comprises:
Output port optical power monitoring point between described light amplification module and described optical coupler/optical splitter, for the input optical signal power of Real-Time Monitoring output port, feeds back to described controller to control described image intensifer operating state.
6. image intensifer as claimed in any of claims 1 to 5, is characterized in that, described controller is for realizing the internal control function of described light amplification module.
7. use image intensifer as claimed in claim 1 to carry out a fibre circuit guard method, it is characterized in that, comprising:
The optical signal power that variable optical attenuator described in described optical attenuator luminous power test point Real-Time Monitoring exports;
The optical signal power that described controller obtains according to described optical attenuator luminous power test point monitoring, regulates described variable optical attenuator;
The luminous power data that described controller obtains according to described optical attenuator luminous power test point monitoring judge that Work route breaks down, and control described optical switch and are switched to alternate routing.
8. method according to claim 7, is characterized in that, described image intensifer is used for east orientation structure; Described variable optical attenuator is input port variable optical attenuator; Described optical attenuator luminous power test point is input port luminous power test point, between described variable optical attenuator and described optical switch; What be connected with described light amplification module is 1:2 light optical splitter;
Described method also comprises:
By the output optical signal power of the output port optical power monitoring point Real-Time Monitoring output port between described light amplification module and described smooth optical splitter, feed back to described controller to control described image intensifer operating state.
9. method according to claim 7, is characterized in that, described image intensifer is used for the east of west to structure; Described variable optical attenuator is input port variable optical attenuator; Described optical attenuator luminous power test point as input port luminous power test point between described variable optical attenuator and described optical switch; What be connected with described light amplification module is 1:2 optical coupler/optical splitter;
Described method also comprises:
By the output optical signal power of the output port optical power monitoring point Real-Time Monitoring output port between described light amplification module and described smooth optical splitter, feed back to described controller to control described image intensifer operating state.
10. method according to claim 7, is characterized in that, also comprises:
Described controller is for realizing the internal control function of described light amplification module.
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