CN102386969A - Receiving performance optimization method and device for optical communication system - Google Patents
Receiving performance optimization method and device for optical communication system Download PDFInfo
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Abstract
The invention discloses a receiving performance optimization method and device for an optical communication system, wherein the method comprises the steps of: demodulating and analyzing the signals received by a receiver to obtain information of an error code; regulating the working point of the receiver based on the information of the error; and carrying out feedback control to the receiver. In the method disclosed by the invention, the receiver is controlled by the information relevant to the error code; the information of error code primarily used for correcting and alarming is jointed to the control to the receiver of the optical communication system, so that the transmission performance of the optical communication system can be greatly improved.
Description
Technical field
The present invention relates to the optical fiber transmission technique field, more specifically, relate to a kind of optical communication system receptivity optimization method and device.
Background technology
In engineering practice, optical communication system is not desirable digital channel, time delay when signal can produce distortion with non-the grade in the transmission course of medium, thus will produce distortion and shake, distortion and shaking finally is reflected on the error code of system.
In order to guarantee digital signal transmission accurately on the communication channel of optical communication system transmitting terminal and receiving terminal, mainly contain following two kinds of schemes at present: the one, make transmitter and receiver all be operated on the optimal working point; Moreover, can make receiver can identify the part error code and also correct through suitable coded system.For preceding a kind of scheme, industry utilizes FEEDBACK CONTROL to optimize the working point of transmitter and receiver more; And for a kind of scheme in back; More is to adopt the error code correction technology; It is a kind of data encoding technique, and signal can carry out certain format analysis processing to it before be transmitted in advance, the purpose of then decoding and finding out error code and error correction to reach by the algorithm of regulation at receiving terminal.But the error code correction technology can be found mistake and need not notify transmit leg to retransmit just error correction, thereby can improve the transmission performance of system.
But in the present optical communication system, above-mentioned two kinds of schemes are relatively more independent usually.Utilize the inherent characteristic of device itself to control for the FEEDBACK CONTROL of transmitter and receiver, error code information then mainly is used in coding, error correction and the alarm of signal, does not well connect between the two more.The result who causes like this is exactly the control algolithm complicacy of receiver itself, but error code information but fully is not applied.
Summary of the invention
The technical problem that the present invention solves provides a kind of optical communication system receptivity optimization method and device, improves the transmission performance of optical communication system.
For solving the problems of the technologies described above, the invention provides a kind of optical communication system receptivity optimization method, said method comprises:
After the signal that receiver is received carries out demodulation analysis, draw error code information;
Adjust the working point of said receiver according to the said error code information that draws, said receiver is carried out FEEDBACK CONTROL.
Further, adopt negative-feedback circuit or negative feedback algorithm that said receiver is carried out FEEDBACK CONTROL;
Wherein, said negative feedback algorithm comprises PID (PID) algorithm or adaptive algorithm.
Further, adopt pid algorithm that the detailed process that said receiver carries out FEEDBACK CONTROL is comprised the steps:
Whether the difference of step 2, the number of bit errors when judging the shake of the said forward number of bit errors during with said reverse shake is less than predetermined threshold, if then adopt present operating point, the feedback control procedure end; Otherwise, continue execution in step three;
Further, adopt adaptive algorithm that the detailed process that said receiver carries out FEEDBACK CONTROL is comprised the steps:
Step a is added to a coarse adjustment amount on the controlled variable, and controlled variable is near the correct working point;
Step b, utilize the current error rate of error code caching record after, carry out the renewal of an optimized amount, optimized amount=± 1 * K * current error rate BER, wherein K is adjustment gain, ± 1 is adjustment polarity;
Step c, the error rate after relatively optimized amount is upgraded and the size of the error rate in the error code buffer memory, if the error rate after upgrading diminishes, then polarity need not be adjusted; If it is big that the error rate after upgrading becomes, then polarity needs counter-rotating.
Further, said method also comprises:
After accomplishing said step c, at a certain time interval, said step b and said step c are carried out in circulation, continue the working point of the said receiver of adjustment.
Further, said error code information comprises a kind of of following information or its combination in any:
Entangle 0 number, entangle 1 number, can not entangle number, OOF (OOF), LOF (LOF).
Further, the module of respectively forming of receiver is carried out said FEEDBACK CONTROL respectively, adopt parallel or time-multiplexed mode between each feedback control loop.
The present invention also provides a kind of optical communication system receptivity optimization means, and said device comprises:
The error code message processing module after being used for the signal after the receiver demodulation analyzed, draws error code information, and the error code information that draws is passed to the receiver control module;
The receiver control module is used for adjusting according to the error code information received the working point of said receiver, and said receiver is carried out FEEDBACK CONTROL.
Wherein, said receiver control module is further used for, and adopts the negative feedback algorithm that said receiver is carried out FEEDBACK CONTROL.
Wherein, communicating by letter between said error code message processing module and the said receiver control module is to realize through a data wire and a clock lines;
When said error code message processing module passes to said receiver control module with said error code information, between frame that transmits said error code information and frame, comprise the regular hour gap.
Compared with prior art, the present invention has following beneficial effect at least:
Utilize the relevant information of error code to come receiver control,, the light communication system transmission performance is greatly improved the original control of only introducing the light communication system receiver as the error code information of error correction, alarm;
For the control of light communication system receiver has increased the feedback control loop of reflection error code information, improve some because the performance loss that transmission medium causes;
In addition, compare with device with traditional receptivity optimization method, it is directly perceived to have principle, realizes convenient and swiftly, is easy to advantages such as digitlization.
Description of drawings
Fig. 1 is the schematic block diagram based on the optical communication system receptivity optimization means of minimum bit-error rate of the embodiment of the invention;
Fig. 2 is the DPSK receiving terminal performance optimization schematic representation of apparatus of the embodiment of the invention;
Fig. 3 is the main schematic flow sheet of the DPSK receiving terminal performance optimization algorithm of the embodiment of the invention;
Fig. 4 is to the schematic flow sheet of the FEC feedback control algorithm of DLI Phase in the embodiment of the invention;
Fig. 5 is for adopting the achieve a butt joint sketch map of receipts machine FEEDBACK CONTROL of adaptive algorithm in the embodiment of the invention;
Fig. 6 is the frame structure exemplary plot of communication between FEC processing module and the digital processing element of the embodiment of the invention;
Fig. 7 is the frame structure exemplary plot of communication between FEC processing module and the digital processing element of another embodiment of the present invention.
Embodiment
Main purpose of the present invention is to provide a kind of optical communication system receptivity optimization method and device based on minimum bit-error rate; Its core concept is; The error code information of utilizing receiver to receive to contain in the signal is as feedback signal; And it is offered the control module based on error code information; Control module is carried out controlled in real-time according to these error code information butt joint receipts machines, the error rate when the receiver regenerated signal minimum (can think that operation of receiver is on the optimal working point this moment), thus realize optimization to the optical communication system receptivity.
Based on above-mentioned thought, the present invention provides a kind of optical communication system receptivity optimization method, specifically adopts following technical scheme:
After the signal that receiver is received carries out demodulation analysis, draw error code information;
Adjust the working point of said receiver according to the said error code information that draws, said receiver is carried out FEEDBACK CONTROL, to reduce the error rate of receiver.
Further, adopt negative-feedback circuit or negative feedback algorithm that receiver is carried out FEEDBACK CONTROL;
Wherein, said negative feedback algorithm comprises: PID (Proportion Integral Differential, PID) algorithm, adaptive algorithm etc.
Further, if adopt pid algorithm, the detailed process of then receiver being carried out FEEDBACK CONTROL can comprise the steps:
Whether the difference of step 2, the number of bit errors when judging the shake of the said forward number of bit errors during with said reverse shake is less than predetermined threshold, if then adopt present operating point, the feedback control procedure end; Otherwise, continue execution in step three;
Further, if adopt adaptive algorithm, the detailed process of then receiver being carried out FEEDBACK CONTROL can comprise the steps:
Step a is added to a coarse adjustment amount on the controlled variable, and controlled variable is near the correct working point;
Step b utilizes the error code buffer memory to write down the current error rate, carries out the renewal of an optimized amount then, optimized amount=± 1 * K * current error rate BER, and wherein K is the adjustment gain, ± 1 is adjustment polarity;
Step c, the error rate after relatively optimized amount is upgraded and the size of the error rate in the error code buffer memory, if the error rate after upgrading diminishes, then polarity need not be adjusted; If it is big that the error rate after upgrading becomes, then polarity needs counter-rotating.
In addition, behind the completion above-mentioned steps c, at a certain time interval, recirculation execution in step b and step c, the working point of continuing the said receiver of adjustment.
Further, said error code information includes but not limited to a kind of of following information or its combination in any:
Total number of bit errors, wrong 1 number, wrong 0 number, LOF (Loss Of Frame, LOF), OOF (Out Of Frame, OOF).
Further, the module of respectively forming of receiver is carried out said FEEDBACK CONTROL respectively, and adopt parallel or time-multiplexed mode between each feedback control loop.
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Device as shown in Figure 1, that the embodiment of the invention provides a kind of optical communication system receptivity to optimize, this device mainly comprises following part:
Error code message processing module 102 is used for restituted signal is analyzed, and extracts error code information wherein, and it is transferred to the receiver control module based on the error code feedback information.
Error code message processing module 102 can be ASIC (Application Specific Integrated Circuit, application-specific integrated circuit (ASIC)) or FPGA digit chips such as (Field Programmable Gate Array, field programmable gate arrays).
Wherein, negative-feedback circuit can be the ASIC circuit that is solidified into by related algorithm.The negative feedback algorithm can be pid algorithm or adaptive algorithm, can be realized by FPGA, DSP chips such as (Digital Signal Processor, digital signal processors).
Wherein, Error code message processing module and under the prerequisite that satisfies error code information communication bandwidth, can adopt conventional communication interface based on the communication between the receiver control module of error code feedback information; Also can self defined interface; It generally can be made up of a data lines and a clock line, but is not limited thereto.In addition, the error code message processing module includes the regular hour gap, as the message processing time of receiver control module between frame that transmits said error code information and frame when error code information is passed to the receiver control module.
In addition, the embodiment of the invention provides a kind of optical communication system receptivity optimization method, and in conjunction with the composition module of the foregoing description optimization means, its realization mainly may further comprise the steps:
Receiver module at first carries out demodulation to the input signal of band error code information overhead of input, draws the signal after the demodulation;
The signal of error code message processing module after to demodulation handled, and draws the error code information that wherein comprises, and it is passed to the receiver control module based on the error code feedback information;
The receiver control module is carried out FEEDBACK CONTROL according to the error code information that obtains to receiver, and receiver is optimized on the best working point.
In order to realize above-mentioned light communication system receptivity optimisation technique scheme; Below with (the Differential Phase Shift Keying of DPSK in the optical transmission system; Differential phase keying (DPSK)) receiver of modulation format is an example; Provide following a kind of preferred embodiment; (what need explanation a bit is that technical scheme involved in the present invention goes for any optical communication system receptivity optimization that has error code Information Statistics function, and is not limited to the transmission of light signal DPSK modulation format) as shown in Figure 2:
DLI (delay line interferometer) 201, Balance receiver (balanced reciver) 202 and Demux (demultiplexing chip) 203 have formed the receiver module of a DPSK jointly.Input light at first hold mutually, end two ways of optical signals mutually disappears through DLI201 formation by length; This two ways of optical signals obtains the high-speed electrical signals of two-way difference again through balanced reciver 202; This two-way high-speed-differential signal of telecommunication is finally obtained the signal of telecommunication of multi-path low speed by demultiplexing chip 203 demultiplexings, to make things convenient for the processing of follow-up processing unit.
Wherein, Many parameters in this DPSK receiver module all can impact transmission performance; DLI phase (DLI phase place), RX TH (balanced reciver receive threshold), Demux phase (Demux phase place) etc. are more typically arranged; These receiver module parameters all need be carried out controlled in real-time, to guarantee the optimum of receiver module performance.
As shown in Figure 3, the FEC FEEDBACK CONTROL in this instance mainly comprises following content:
The FEC FEEDBACK CONTROL of DLI phase;
The FEC FEEDBACK CONTROL of balanced reciver receive threshold RX_TH; And
The FEC FEEDBACK CONTROL of Demux phase.
FEC with DLI phase is feedback controlled to example (error code information not necessarily provides with the form of forward direction error correcting code FEC, also can be other coded systems) below, and the idiographic flow of FEC FEEDBACK CONTROL is done further to introduce.
As shown in Figure 4, the FEC feedback of the DLI phase of present embodiment is realized as follows:
Wherein, The receiver control module can be accomplished by digital processing element 205 (like FPGA, DSP etc.); Digital processing element 205 control produces dither (shake) signal of a DLI phase control voltage, and this dither signal is superposeed in the control point voltage of DLI phase (the phase control point voltage is a DLI most principal work point).
Concrete digital algorithm FEEDBACK CONTROL can be: as A during greater than B (it is big explain that forward is shaken error code), then the control point voltage of DLI phase is turned down to reduce error code; When A (explains that negative sense shake error code is big) during less than B, then the control point voltage of DLI phase is transferred greatly to reduce error code; And if the difference between A and the B in the reasonable scope, when for example both differences are less than predetermined threshold value, explain that then present control point voltage need not adjustment.
The parameter that other need be controlled comprises that the FEC FEEDBACK CONTROL of control flow and DLI phase of RX_TH, Demux phase is similar, repeats no more at this.Preferably, for fear of the FEC feedback control loop phase mutual interference of each parameter, can in digital processing element, do time division multiplexing in the optical communication system to each loop, if but separate between each parameter, also can walk abreast certainly and control.
In addition, the present invention can also adopt the achieve a butt joint FEEDBACK CONTROL of receipts machine of adaptive algorithm.Referring to shown in Figure 5, in the embodiment of the invention, can carry out FEEDBACK CONTROL through error code cache module and the Polarity Control module receipts machine that achieves a butt joint.
Referring to Fig. 5, in the present embodiment, the detailed process of receiver being carried out FEEDBACK CONTROL can comprise the steps:
Step a is added to a coarse adjustment amount on the controlled variable, and controlled variable probably is near the correct working point;
Step b utilizes the error code buffer memory to write down the current error rate, carries out the renewal of an optimized amount then, optimized amount=± 1 * K * current error rate BER;
Wherein K is the adjustment gain, and ± 1 is adjustment polarity, and polarity is by the Polarity Control module controls;
Step c, the error rate after relatively optimized amount is upgraded and the size of the error rate in the error code buffer memory, if the error rate after upgrading diminishes, then polarity need not be adjusted; If it is big that the error rate after upgrading becomes, then polarity needs counter-rotating;
After accomplishing above-mentioned steps c, at a certain time interval, recirculation execution in step b and step c, the working point of continuing the said receiver of adjustment is optimized the working point.
Wherein, the communication between FEC processing module and the digital processing element can adopt a data lines Data and a clock line Clock to realize.As a kind of realization, can define the FEC processing module and send the error code information data, and digital processing element is gathered the error code information data at rising edge clock at the clock trailing edge.Fig. 6 shows the sketch map of frame of the transmission error code information of the embodiment of the invention, and is as shown in Figure 6, as the frame that between FEC processing module and digital processing element, transmits error code information; Can comprise in the frame one or more error code information (like E1, E2 ... En); Wherein said error code information can be any information that can reflect error code; As entangle 1 number, entangle 0 number, total bit error rate or the like.Between frame and frame, can also reserve the message processing time of certain blank time simultaneously as digital processing element.
Fig. 7 shows a kind of concrete structure example of transmitting the frame of error code information; Wherein the frame inner structure comprises and entangles 1 number (Number of corrected 1s); Entangle 0 number (Number of corrected 0s); Can not error correction number (Number of uncorrected blocks), OOF, LOF information.Wherein, 1 to 16 for entangling 1 number, and 17 to 32 for entangling 0 number, and 33 to 40 is can not the error correction number, and 41 is OOF, and 42 is LOF.Certainly, what illustrate is merely preferred version of the present invention here, in practical application, can define voluntarily for frame structure, also can expand on this basis as required.
More than be merely preferred case study on implementation of the present invention; Be not limited to the present invention; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof, those of ordinary skill in the art can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
One of ordinary skill in the art will appreciate that all or part of step in the said method can instruct related hardware to accomplish through program, said program can be stored in the computer-readable recording medium, like read-only memory, disk or CD etc.Alternatively, all or part of step of the foregoing description also can use one or more integrated circuits to realize.Correspondingly, each the module/unit in the foregoing description can adopt the form of hardware to realize, also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
Claims (10)
1. optical communication system receptivity optimization method is characterized in that said method comprises:
After the signal that receiver is received carries out demodulation analysis, draw error code information;
Adjust the working point of said receiver according to the said error code information that draws, said receiver is carried out FEEDBACK CONTROL.
2. the method for claim 1 is characterized in that,
Adopt negative-feedback circuit or negative feedback algorithm that said receiver is carried out FEEDBACK CONTROL;
Wherein, said negative feedback algorithm comprises PID (PID) algorithm or adaptive algorithm.
3. method as claimed in claim 2 is characterized in that,
Adopt pid algorithm that the detailed process that said receiver carries out FEEDBACK CONTROL is comprised the steps:
Step 1 adds forward to present operating point and shakes and reverse shake, the number of bit errors when number of bit errors when adding up the forward shake respectively and reverse shake;
Whether the difference of step 2, the number of bit errors when judging the shake of the said forward number of bit errors during with said reverse shake is less than predetermined threshold, if then adopt present operating point, the feedback control procedure end; Otherwise, continue execution in step three;
Step 3 is if the number of bit errors of the number of bit errors in forward when shake during greater than reverse shake after then present operating point being turned down, returned step 1; Otherwise, after then present operating point being heightened, return step 1.
4. method as claimed in claim 2 is characterized in that,
Adopt adaptive algorithm that the detailed process that said receiver carries out FEEDBACK CONTROL is comprised the steps:
Step a is added to a coarse adjustment amount on the controlled variable, and controlled variable is near the correct working point;
Step b, utilize the current error rate of error code caching record after, carry out the renewal of an optimized amount, optimized amount=± 1 * K * current error rate BER, wherein K is adjustment gain, ± 1 is adjustment polarity;
Step c, the error rate after relatively optimized amount is upgraded and the size of the error rate in the error code buffer memory, if the error rate after upgrading diminishes, then polarity need not be adjusted; If it is big that the error rate after upgrading becomes, then polarity needs counter-rotating.
5. method as claimed in claim 4 is characterized in that, said method also comprises:
After accomplishing said step c, at a certain time interval, said step b and said step c are carried out in circulation, continue the working point of the said receiver of adjustment.
6. like each described method of claim 1 to 5, it is characterized in that,
Said error code information comprises a kind of of following information or its combination in any:
Entangle 0 number, entangle 1 number, can not entangle number, OOF (OOF), LOF (LOF).
7. like each described method of claim 1 to 5, it is characterized in that,
The module of respectively forming to receiver is carried out said FEEDBACK CONTROL respectively, adopts parallel or time-multiplexed mode between each feedback control loop.
8. optical communication system receptivity optimization means is characterized in that said device comprises:
The error code message processing module after being used for the signal after the receiver demodulation analyzed, draws error code information, and the error code information that draws is passed to the receiver control module;
The receiver control module is used for adjusting according to the error code information received the working point of said receiver, and said receiver is carried out FEEDBACK CONTROL.
9. device as claimed in claim 8 is characterized in that,
Said receiver control module is further used for, and adopts the negative feedback algorithm that said receiver is carried out FEEDBACK CONTROL.
10. like claim 8 or 9 described devices, it is characterized in that,
Communicating by letter between said error code message processing module and the said receiver control module is to realize through a data wire and a clock lines;
When said error code message processing module passes to said receiver control module with said error code information, between frame that transmits said error code information and frame, comprise the regular hour gap.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9432117B2 (en) | 2014-12-29 | 2016-08-30 | Industrial Technology Research Institute | Visible light communication apparatus and method of visible light communication |
| WO2017041605A1 (en) * | 2015-09-07 | 2017-03-16 | 中兴通讯股份有限公司 | Compensation control method and apparatus for forward error correction (fec) |
| CN109120350A (en) * | 2017-06-26 | 2019-01-01 | 颖飞公司 | Signal of communication tracking system |
| WO2021057417A1 (en) * | 2019-09-29 | 2021-04-01 | 华为技术有限公司 | Method, device and system for configuring optical working point of modulator |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101102160A (en) * | 2007-06-13 | 2008-01-09 | 华为技术有限公司 | Threshold voltage adjusting unit, adjusting method, limit rage amplifier and optical receiver |
-
2010
- 2010-09-02 CN CN201010273184.0A patent/CN102386969B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101102160A (en) * | 2007-06-13 | 2008-01-09 | 华为技术有限公司 | Threshold voltage adjusting unit, adjusting method, limit rage amplifier and optical receiver |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9432117B2 (en) | 2014-12-29 | 2016-08-30 | Industrial Technology Research Institute | Visible light communication apparatus and method of visible light communication |
| WO2017041605A1 (en) * | 2015-09-07 | 2017-03-16 | 中兴通讯股份有限公司 | Compensation control method and apparatus for forward error correction (fec) |
| CN109120350A (en) * | 2017-06-26 | 2019-01-01 | 颖飞公司 | Signal of communication tracking system |
| WO2021057417A1 (en) * | 2019-09-29 | 2021-04-01 | 华为技术有限公司 | Method, device and system for configuring optical working point of modulator |
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