CN1298116C - Optical transmission system with automatic optimizing transmitting end performance and automatic optimizing method - Google Patents
Optical transmission system with automatic optimizing transmitting end performance and automatic optimizing method Download PDFInfo
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- CN1298116C CN1298116C CNB2003101123091A CN200310112309A CN1298116C CN 1298116 C CN1298116 C CN 1298116C CN B2003101123091 A CNB2003101123091 A CN B2003101123091A CN 200310112309 A CN200310112309 A CN 200310112309A CN 1298116 C CN1298116 C CN 1298116C
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Abstract
The present invention discloses an optical transmission system automatically optimizing transmitting terminal performance in the technical field of optical communication, and a method using the system to carry out automatic optimization. The system comprises a transmitting terminal, a receiving terminal, a transmission route and a monitoring passage road, wherein the transmitting terminal comprises a continuous wave light source, an intensity modulator, a phase modulator, an intensity modulation drive circuit, a phase modulation drive circuit, a sampling optical coupler, an automatic power control circuit, a CPU system, a transmitting terminal route repeater and an output optical interface; the receiving terminal comprises an input optical interface, an input optical coupler, a receiver, a Q value tester, a control CPU and a receiving terminal route repeater. The present invention automatically realizes system performance optimization, has no need of carrying out a large quantity of artificial debugging at the time of opening systems, is consistent with the operation maintenance requirements of on-line devices and not only is suitable for systems with signals and FEC codes, but also is suitable for systems with signals and without FEC codes.
Description
Technical field
The present invention relates to the transmission equipment in the optical communication field, specifically, relate to wherein Laser Modulation transmission and receiving system, the device that transmitting terminal is automatically adjusted in order to realize system's Automatic Optimal, and the autocontrol method that is adopted.
Background technology
The characteristic of optical transmission system light source is influential to systematic function, and light source is after intensity modulated, and main feature has average power and warbles.Average power embodies the intensity of light signal output, and warbling is phase change characteristic additional on intensity-modulated signal, embodies the dynamic change of carrier wave.Constant in other condition, the average power size that is input in the transmission line to the transmission system Effect on Performance is: when average power is low, because the existence of noise makes receptivity degenerate (using the Q value representation) in the circuit; And when average power is higher, because the nonlinear effect of Optical Fiber Transmission strengthens receptivity is degenerated; Optimum Q value occurs in power P when moderate (Fig. 1 .a).Constant in other conditions, the modulation signal light power of warbling to the transmission system Effect on Performance is: (d Φ/dt)/(dln p/dt), wherein Φ is the instantaneous phase of optical signal carrier, and p is the light signal instantaneous power at first to define chirp coefficient a=2.When chirp coefficient a＞0 and absolute value are big, when perhaps chirp coefficient a＜0 and absolute value are big, receiving terminal performance will degenerate (Fig. 1 .b); Make the chirp coefficient value of systematic function optimum relevant with situations such as circuit chromatic dispersions.Usually, light source is through after the intensity modulated, can have warbling to a certain degree.
She Ji transmitter generally speaking, average output power is predefined in certain fixing value (or more among a small circle in), and selects to warble little modulation scheme as far as possible, because the difference of transmission line property, sometimes receptivity is unsatisfactory, need manually adjust under the system works condition.
Manually transmitter is regulated more loaded down with trivial details, especially at quantity of light source (for example a kind of 160 glistening light of waves transmission equipments, the unidirectional emission end has 160 optical senders) more for a long time; The long haul transmission system receiving terminal is at far-end (several kilometers to thousands of kilometers), so field adjustable is very difficult.
In wavelength route optical network, the transmission channel of light signal can change in real time in addition, need carry out real-time regulated to light source, changes to adapt to route, obtains optimum systematic function.
In the design of disclosed patent, the power of each optical interface of system is adjusted, how the power levels with target detection point are target, in the hope of reach the predetermined electric power requirement at acceptance point.We think that the predetermined electric power target is not equal to the systematic function of the best, need consider on the signal delivery quality that optical channel carried.
Laid-open U.S. Patents application US 20020054648 (Method for equalizing channelquality differences in a WDM system) proposes, can measure the receptivity of all receivers, derive suitable error code thresholding, then by regulating the equilibrium that transmitting power realizes the error rate, this control method, purpose are in order to make each passage have identical transmission quality when point-to-point transmits.This invention only is to be regulating measure with power, can not realize global optimization in the larger context, and can not carry out automation and regulate.
Disclosed patent application U.S. US 20020178417 (Communication channeloptimization using forward error correction statistics) proposes, a situation arises at receiving terminal statistics error code with FEC (forward error correction) device, then regulating command sent to transmitting terminal.Regulating the transmitting terminal performance makes error code reduce (for example regulating power).Further propose among the disclosed patent application US 20030016695 (System and method for automatic optimization of optical communicationsystems), periodically add up error code with the FEC device at receiving terminal, regulate transmitting terminal all properties parameter according to the result then, for example wavelength, phase place, RZ (making zero) coefficient etc. are added up, compare, are adjusted and carry out repeatedly.Disclosed patent application US 20020039217 (Method ofadaptive signal degradation compensation) also proposes, for the FEC encoded signals is arranged, determine the degradation coefficient at receiving terminal, feed back to transmitting terminal then, regulate prechirp character according to the result, systematic function is optimized.The device that these patent applications are stated all is limited to the optical transmission system that signal has the FEC coding.
Among the disclosed patent application US 20020048062 (Wavelength division multiplexing opticalcommunication system and wavelength division multiplexing opticalcommunication method), propose to carry out Optical Signal To Noise Ratio and error rate detection at receiving terminal in the wavelength-division multiplex system, testing result is sent to transmitting terminal, regulate the transmitting terminal preequalization and warble the realization system function optimization.We think, need not to carry out the Optical Signal To Noise Ratio test when realizing system optimization; The error rate is tested then and can be caused system optimization to regulate overlong time owing to the testing time is longer, damage the practicality of this invention, especially when the error rate is low.
Summary of the invention
The present invention is for overcoming the above problems, and having proposed a kind of is that target is carried out the optical transmission system of Automatic Optimal to transmitting terminal with signal Q value, and proposes a kind of method of the transmitting terminal performance being carried out Automatic Optimal on this basis.
The optical transmission system of the transmitting terminal performance Automatic Optimal among the present invention comprises transmitting terminal and receiving terminal two parts and transmission route and monitor channel route;
Described transmitting terminal comprises: continuous wave light source, intensity modulator, phase-modulator, intensity modulated drive circuit, phase modulated drive circuit, sampled light coupler, automatic power control circuitry, cpu system, transmitting terminal routing forwarding device, output optical interface; A transmission signals part is suitably amplified through the intensity modulator drive circuit and the back of setovering forms drive signal access intensity modulator, and the light that continuous wave light source is outputed to described intensity modulator carries out amplitude modulation; Another part of described transmission signals suitably amplifies through described phase-modulator drive circuit and the back of setover forms drive signal and inserts described phase-modulator, makes the described phase-modulator of the process adjustment of warbling again of described intensity modulator output light; The signal of modulation back output enters transmission line through after the described sample coupler through described output optical interface; Described sample coupler is connected with described automatic power control circuitry, under the control of the power selection level that described cpu system is exported, described automatic power control circuitry makes the light signal average power that outputs to described transmission line locked by the FEEDBACK CONTROL to described continuous wave light source; Described cpu system is controlled described intensity modulator drive circuit, described phase-modulator drive circuit, described automatic power control circuitry, and link to each other with described transmitting terminal routing forwarding device, send instruction or data to it, also can receive its instruction of sending here or data;
Described receiving terminal comprises: input optical interface, input optical coupler, receiver, Q value tester, Controlled CPU, receiving terminal routing forwarding device; Light signal enters described receiver through described input optical interface, described input optical coupler; Described input optical coupler connects described Q value tester, and this Q value tester links to each other with described Controlled CPU, and this Controlled CPU also links to each other with described receiving terminal routing forwarding device, can send instruction or data by it, also can receive instruction or data by it.Control of the present invention divides distributed control and centralized control dual mode, under the situation of distributed control, link to each other by transmission route between described output optical interface and the input optical interface, transmitting terminal routing forwarding device links to each other by the monitor channel route with receiving terminal routing forwarding device.Under the situation of centralized control, also comprise a centralized control point, centralized control point comprises a centralized control point routing forwarding device and master controller; Link to each other by transmission route between described output optical interface and the input optical interface, centralized control point routing forwarding device links to each other with transmitting terminal routing forwarding device by route, links to each other with receiving terminal routing forwarding device through route.
To the processing of multiple signals, the solution of the present invention also comprises transmitting terminal and receiving terminal and transmission route and monitor channel route;
Described emission end branch comprises multichannel optical processing unit, wave multiplexer, light output interface, device bus, terminal control unit, transmitting terminal routing forwarding device; Optical processing unit, described every road comprises: continuous wave light source, intensity modulator, phase-modulator, intensity modulator drive circuit, phase-modulator drive circuit, sampled light coupler, automatic power control circuitry, cpu system; Every road transmission signals part is suitably amplified through the intensity modulator drive circuit and the back of setovering forms drive signal access intensity modulator, continuous wave light source is outputed to the light amplitude modulation of intensity modulator; Another part of transmission signals suitably amplifies through the phase-modulator drive circuit and the back of setover forms drive signal and inserts phase-modulator, through the process phase-modulator adjustment of warbling again of intensity modulator output light; Every road signal enters transmission line through lumping together the back at described wave multiplexer place behind the sampled light coupler of this unit by described smooth output interface; Described terminal control unit is connected by the cpu system of described device bus with optical processing unit, every road, and described terminal control unit also is connected with described transmitting terminal routing forwarding device;
Described receiving terminal comprises that partly input optical interface, channel-splitting filter, a plurality of input optical coupler, a plurality of receiver, multichannel select an optical switch or optical switch group, Q value tester, Controlled CPU, receiving terminal routing forwarding device; Light signal is input to described channel-splitting filter by described input optical interface, the demultiplexing optical channel, enter described each receiver through behind the described sampled light coupler respectively, after selecting an optical switch or optical switch group selection by described multichannel, the described light signal of respectively importing the optical coupler sampling enters described Q value tester, employed optical channel is controlled by described Controlled CPU during this Q value tester test, this Controlled CPU also is connected with described receiving terminal routing forwarding device, can send instruction or data by it, also can receive instruction or data by it.
Treatment system to multiple signals, the present invention also comprises distributed control and centralized control dual mode, under the situation of distributed control, link to each other by transmission route between described output optical interface and the input optical interface, transmitting terminal routing forwarding device links to each other by the monitor channel route with receiving terminal routing forwarding device.Under the situation of centralized control, also comprise a centralized control point, centralized control point comprises a centralized control point routing forwarding device and master controller; Link to each other by transmission route between described output optical interface and the input optical interface, centralized control point routing forwarding device links to each other with transmitting terminal routing forwarding device by route, links to each other with receiving terminal routing forwarding device through route.
The method of the transmitting terminal Automatic Optimal among the present invention may further comprise the steps:
Step 1: send and instruct, carry out the Q value and detect to receiving terminal;
Step 2: transmitting terminal power is carried out iteration control, detect receiving terminal Q value simultaneously and analyze, reach optimization aim until the Q value;
Step 3: the transmitting terminal phase place is carried out iteration control, detect receiving terminal Q value simultaneously and analyze, reach optimization aim until the Q value;
Step 4: judge the Q value that above step 2 and step 3 obtains, when satisfying the control precision requirement, adjusting stops;
In equipment running process, one or more in the kind pattern the more below can using: (1), start operation automatically; (2), spontaneous startup, promptly when the index deterioration surpasses threshold value, start automatically; (3), instruction starts.
In such scheme, according to starting up's pattern, job step is:
1-1 sends and instructs to receiving terminal, carries out the Q value and detects;
1-2 carries out power adjustments, and the limit is regulated frontier inspection and surveyed, and forms power control iterative process, reaches an optimal value Q up to receiving terminal Q value
Opt1
The 1-3 adjusting of warbling, the limit is regulated frontier inspection and is surveyed, and forms phase-modulator and drives iterative process, reaches an optimal value Q up to receiving terminal Q value
Opt2
1-4 is when reaching stable optimization as a result the time, and control procedure finishes, otherwise gets back to step 1-2.
According to spontaneous start-up mode, promptly system is realizing that automatically the receiving end signal performance is lower than Q
ThShi Qidong, job step is:
2-1 sends and instructs to receiving terminal, carries out the Q value and detects;
2-2 judges whether performance satisfies Q＞Q
Th, Q
ThIt is predefined value; If enter the 2-step; If not, enter step 2-4;
2-3 gets back to step 2-1 through a delay period;
2-4 carries out power adjustments, and the limit is regulated frontier inspection and surveyed, and forms power control iterative process, reaches an optimal value Q up to receiving terminal Q value
Opt1, enter step 2-5 after the execution;
The 2-5 adjusting of warbling, the limit is regulated frontier inspection and is surveyed, and forms phase-modulator and drives iterative process, reaches an optimal value Q up to receiving terminal Q value
Opt2, enter step 2-6 after the execution;
2-6 is when reaching stable optimization as a result the time, and control procedure finishes to enter step 2-7, otherwise gets back to step 2-4:
After the 2-7 control procedure is finished, if the Q value result who obtains is lower than original Q
Th, illustrative system optimal performance deterioration then needs Q
ThBe reduced to a new level; If the Q value result who obtains is higher than original Q
Th, then can keep original threshold value; Enter step 2-1 then.
According to the instruction start-up mode, promptly system will start receiving under the optimal control instruction situation, and job step is:
The 3-1 control device is inquired about instruction stack;
3-2 then enters step 3-3 if there is not the optimal control instruction that manually issues in instruction stack; If the optimal control instruction is arranged, then enters step 3-4;
3-3 gets back to step 3-1 through a delay period;
3-4 sends and instructs to receiving terminal, carries out the Q value and detects;
3-5 carries out power adjustments, and the limit is regulated frontier inspection and surveyed, and forms power control iterative process, reaches an optimal value Q up to receiving terminal Q value
Opt1Enter step 3-6 after the execution;
The 3-6 adjusting of warbling, the limit is regulated frontier inspection and is surveyed, and forms phase-modulator and drives iterative process, reaches an optimal value Q up to receiving terminal Q value
Opt2Enter step 3-7 after the execution;
3-7 is when reaching stable optimization as a result the time, and control procedure finishes to enter step 3-1, otherwise gets back to step 3-4.
Device given this description and job step, the present invention is intended to that power and the phase characteristic with the transmitting terminal light signal is in the Q value space that independent variable was constituted (Fig. 1 .c) in the optical transmission system, realizes the systematic function optimization automatically.Among the figure, Q
OptOccur in P=P
Opt, a=a
OptThe time, Q
Opt＞Q
1＞Q
2＞Q
3＞Q
4＞Q
5＞Q
6＞Q
7Through above job step, can make (P, a) through n iteration from (P
1, a
1) become (P
n, a
n), corresponding Q value progressively approaches Q
Opt, require the back static up to satisfying control precision.
This device is automatically realized system function optimization, carries out a large amount of manual debugging when need not to open in system, meets online equipment operating and maintenance requirements.Especially in the following areas: the fiber medium that, is applicable to any attribute; Two, the automatic operational mode of utilization start, device of the present invention can be realized performance preset automatically by method of work of the present invention; Equipment has the characteristics of " no matter assembling back ".Three, under spontaneous start-up mode, can periodically monitor transmission performance, during because of environmental impact generation change at random, device of the present invention has adaptation function at circuit optical fiber, can realize the output signal constraint automatically by method of work of the present invention; Four, under equipment running status, when needs change the transmitting terminal attribute, only need assign power or the adjustment instruction of warbling to device of the present invention, device of the present invention promptly realizes regulating target automatically by method of work of the present invention.
Gain adjusting method therefore of the present invention has compared with prior art been obtained the progress of optical communication equipment control mode, both has been applicable to that signal had the system of FEC coding, is applicable to that also signal does not have the system of FEC coding.In addition, this device is not tested the Optical Signal To Noise Ratio of receiving terminal, does not need according to the Optical Signal To Noise Ratio test result transmitter to be carried out preequalization yet and regulates, and has simplified the optimal control means.Detect feedback result according to the Q value in addition and implement control, and implement control according to error rate testing result and compare, response speed is faster, especially when the error rate is low.
Description of drawings
Fig. 1 .a is that transmitting terminal launched power and transmission performance concern schematic diagram;
Fig. 1 .b is transmitting terminal signal variation and the transmission performance relation schematic diagram of warbling;
Fig. 1 .c is transmitting terminal launched power, signal variation and the transmission performance relation schematic diagram of warbling;
Fig. 2 .a is system of the present invention and a kind of embodiment schematic diagram (control distributes);
Fig. 2 .b is that the another kind of system of the present invention is implemented illustration (centralized control);
Fig. 3 is the flow chart of the transmitting terminal performance automatic optimization method among the present invention;
Fig. 4 is the system embodiment schematic diagram that the present invention solves multiple signals.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.Each mark is represented respectively among the figure: 1: input signal
2: transmission line
3: monitoring of tools route (being connected between transmitting terminal and the receiving terminal)
4: the transmitting terminal wave multiplexer
5: the receiving terminal channel-splitting filter
10: transmitting terminal output optical interface
11: continuous wave light source
12: intensity modulator
13: phase-modulator
14: drive circuit 1 is the drive circuit of intensity modulator
15: drive circuit 2 is drive circuits of phase-modulator
16: sample coupler
17: the laser automatic power control circuitry
18: the cpu system that transmitting terminal is controlled
19: transmitting terminal routing forwarding device
20: the transmitting terminal master controller
21: transmitting terminal multichannel control bus
31: monitoring of tools route (being connected between transmitting terminal and the centralized control website)
32: monitoring of tools route (being connected between receiving terminal and the centralized control website)
41: centralized control website routing forwarding device
42: central control station dot center controller
51:Q value tester control circuit data forwarding port signal
Control of 52:Q value tester and data acquisition port signal
53: multichannel is selected an optical switch control signal
70: output is selected in the sampling of receiving terminal multipath light signal
101: receiving terminal input optical interface
102: the input optical coupler
103: receiver
104: the Q value tester of charged interface
105:Q value tester control circuit
106: receiving terminal routing forwarding device
107: multichannel is selected an optical switch, or has the array of photoswitch that multichannel is selected a function
141: the output signal of intensity modulator drive circuit
151: the output signal of phase-modulator drive circuit
181: drive circuit 2 control signals (drive level selection)
182: drive circuit 1 control signal (drive level selection)
183: the automatic power control circuitry power grade is selected signal
184: the transmitting terminal cpu data is transmitted port signal
185: the Artificial Control instruction interface of transmitting terminal CPU
201: the Artificial Control instruction interface of terminal control unit
421: the Artificial Control instruction interface of central control station dot center controller
1a, 1b: transmitting terminal multichannel input signal
7a, 7b: receiving terminal multi-channel sampling light signal
11a, 11b: multichannel continuous wave light source
12a, 12b: multichannel intensity modulator
13a, 13b: multichannel phase-modulator
14a, 14b: multichannel intensity modulator drive circuit
15a, 15b: multichannel phase-modulator drive circuit
141a, 141b: multichannel intensity modulator drive circuit output signal
151a, 151b: multichannel phase-modulator drive circuit output signal
16a, 16b: multi-channel sampling coupler
17a, 17b: a plurality of automatic power control circuitries
18a, 18b: a plurality of cpu systems
181a, 181b: the control signal of a plurality of phase-modulator drive circuits
182a, 182b: the control signal of a plurality of intensity modulator drive circuits
183a, 183b: the power selection signal of a plurality of automatic power control circuitries
184a, 184b: the interface of a plurality of control circuits and bus
102a, 102b: receiving terminal multichannel input optical coupler
103a, 103b: receiving terminal multipath receiver
Fig. 2 has provided the system block diagram that the present invention handles one-channel signal.
Shown in Fig. 2 .a, be the system and device figure that distributes and control.The so-called control that distributes is meant that transmitting terminal directly obtains the Q value information from receiving terminal, after analyzing by the cpu system of transmitting terminal self, directly transmitting terminal is controlled.
Transmission signals 1 suitably amplifies through intensity modulator drive circuit 14 and the back of setovering forms drive signal 141, inserts intensity modulator 12, realizes continuous wave light source 11 output light amplitude modulation.Output light may produce additional warbling at modulated process.Again through phase-modulator 13 adjustment of warbling.Phase-modulator be by suitably amplify by 15 pairs of transmission signals 1 of drive circuit and setover after signal 151 drive.
Transmission signals 1 normalization magnitudes table can be shown s (t).For example to the NRZ sign indicating number of full width at half maximum=code-element period, amplitude modulator output is expressed as p (t) ≈ 2P*s (t)/(1+ η), and wherein P is an average power, η＜1st, extinction ratio.Extinction ratio is determined when drive circuit 14 acts on intensity modulator 12 by drive signal 141.Drive circuit can be a program control amplifying circuit, can be regulated by 182 level of cpu system 18 outputs in case of necessity.
Phase-modulator drive circuit 15 is said for example, can use logarithmic circuit and add program control amplifying circuit formation, and wherein the multiplication factor of amplifying circuit can be selected in real time by level 181.Then phase-modulator drive circuit output signal 151 is expressed as v (t) ≈ V*ln[s (t)], V is subjected to 181 controls of cpu system 18 output levels, is the regulated value of drive circuit response characteristic.
In the present embodiment, getting phase-modulator phase place when 0 biasing is 0, and has linear phase characteristic, and under the driving of v (t), the additional phase shift of phase-modulator is: Φ (t)=V*ln (s (t)) * π/V
π, V wherein
πBe the driving voltage of phase place when being π.Then according to above narrating chirp coefficient definition expression formula, be a=2 (d Φ/dt)/(dln p/dt)=2V π/V formed additional the warbling of phase-modulator
π
Obtaining a=[a
Min, a
Max] during scope, the scope of corresponding driving voltage regulated value is V=[a
MinV
π/ (2 π), a
MaxV
π/ (2 π)].
For example when obtaining a=-1, phase-modulator drive circuit output signal be v (t)=-V
πLn[s (t)]/(2 π), have v max (t)=| V
πLn η/(2 π) |, v min (t)=0.
The signal of modulation back output enters transmission line 2 through after the sample coupler 16 through transmitting terminal output optical interface connector 10.
If do not use coupler 16, another embodiment is that the light detecting signal of output dorsad by light source obtains feedback, and the working result of its acquisition is identical with such scheme.
At receiving terminal, the light signal after the transmission enters receiver 103 through receiving terminal input optical interface connector 101, input optical coupler 102.
In order to gather the signal performance index that enters receiver quantitatively, connect Q value tester 104 at the input optical coupler, this Q value tester links to each other with control circuit 105 by its control electrical interface signals 52.This Q value tester will excite in the enabled instruction of control circuit 52 down, start test function, and behind EOT result data be returned to 52.Described Q value testing apparatus can Fixed Design in receiving device, also can be designed to finish the back and separate regulating automatically, so that further reduce system's manufacturing cost from equipment.
The routing forwarding device 19,106th of transmitting terminal and receiving terminal connects by monitor channel route 3.When testing result is sent to transmitting terminal, after 18 identifications of transmitting terminal control circuit, testing result is analyzed according to workflow hereinafter described, control each several parts such as 15,17 more respectively.
Shown in Fig. 2 .b, be central controlled system and device figure.So-called centralized control is meant by the centralized control website and obtains the Q value information from receiving terminal, after being analyzed by master controller 42, as required control command is passed to transmitting terminal, the control of transmitting terminal execution command.
Among Fig. 2 . b 11,12,13,14,15,16,17,18,19,101,102,103,104,105,106 each several parts such as grade and the signal that is connected with each several part in fact with Fig. 1 in identical, so omit explanation here to them.The parts different with system shown in Fig. 2 .a are 31,32,41,42, and the centralized control website is made of routing forwarding device 41 and master controller 42.When the automatic controlled function of this device starts, to send the Q value through route 32 to receiving terminal by 42 and detect instruction, receiving terminal testing result value will turn back to the centralized control website, 42 receive the testing result of returning after, according to workflow hereinafter described testing result is analyzed, as required control command is sent to transmitting terminal 18 through route 31, control each several parts such as 15,17 more respectively.
Fig. 3 is with the method that realizes transmitting terminal performance Automatic Optimal in the system in the present invention of flowcharting.Be applicable to two kinds of system configurations of distribution control mentioned above and centralized control.
The method of the transmitting terminal Automatic Optimal among the present invention mainly may further comprise the steps: send and instruct to receiving terminal, carry out the Q value and detect; Transmitting terminal power is carried out iteration control, detect receiving terminal Q value simultaneously and analyze, optimum until the Q value; The transmitting terminal phase place is carried out iteration control, detect receiving terminal Q value simultaneously and analyze, optimum until the Q value; Judge above step and the Q value that is obtained, when satisfying the control precision requirement, adjusting stops.Be elaborated below.
The 1st step: start.After the start, will at first carry out initialization, comprise mode of operation sign, transmitting terminal power rank, phase-modulator initial condition, optimal control iteration cut-off condition ε, threshold value Q operational data
ThDeng.
The 2nd step: judgment task pattern, native system will be distinguished 3 kinds of mode of operations and enter automatic performance optimal control process.Promptly there are 3 kinds of start-up mode: 1, start operation automatically; 2, spontaneous startup (promptly when the index deterioration surpasses threshold value, starting automatically); 3, instruction starts.
Explanation respectively below.
According to mode of operation one: the starting up
The 1-1 step: send and instruct, carry out the Q value and detect to receiving terminal.In distribution control structure, instruction is sent by controller 18; In centralized control structure, instruction is sent by controller 42, and receives data result after detection.
The 1-2 step: carry out power adjustments, the joint frontier inspection that modifies tone is surveyed, and forms power control iterative process, reaches an optimal value up to receiving terminal Q value, is designated as Q
Opt1Iterative process cut-off condition can adopt dual mode, and a kind of mode is that the result of adjacent twice iteration control differs less than a very little value ε, and another kind of mode is that the result of last control surpasses a threshold value Q
ThThe concrete steps of carrying out power adjustments are exemplified as: at first improve power according to a fixed step size, continue to improve power when the Q value improves, the appropriate change step-length reduces power if the Q value reduces then; Or opposite, at first reduce power according to a fixed step size, when improving, the Q value continues to reduce power, the appropriate change step-length improves power if the Q value reduces then.In this step, comprise at least one step iteration control process.
The 1-3 step: the adjusting of warbling, the limit is regulated frontier inspection and is surveyed, and forms phase-modulator and drives iterative process, reaches an optimal value up to receiving terminal Q value, is designated as Q
Opt2Iterative process cut-off condition goes on foot referring to 1-2.The concrete steps of regulating of warbling are exemplified as: at first improve chirp coefficient according to a fixed step size, continue to improve when the Q value improves, the appropriate change step-length reduces to warble if the Q value reduces then; Or on the contrary, at first reduce according to a fixed step size and warble, when the Q value improves, continue to reduce and warble, if reducing then appropriate change step-length raising, the Q value warbles.In this step, comprise at least one step iteration control process.
1-4 step: when reaching stable optimization as a result the time, control procedure finishes, otherwise gets back to the 1-2 step.The condition that control procedure finishes is: | Q
Opt1-Q
Opt2|＜ε, perhaps the result of last control surpasses a threshold value Q
Th
According to mode of operation 2: spontaneous startup, system is realizing that automatically the receiving end signal performance is lower than Q
ThShi Qidong.
The 2-1 step: send and instruct, carry out the Q value and detect to receiving terminal.
The 2-2 step: judge whether performance satisfies Q＞Q
ThIf,, enter the 2-3 step; If not, enter the 2-4 step.
The 2-3 step:, get back to the 2-1 step through a delay period.
The 2-4 step: the same 1-2 of implementation enters the 2-5 step after the execution
The 2-5 step: the same 1-3 of implementation enters the 2-6 step after the execution
2-6 step: when reaching stable optimization as a result the time, control procedure finishes to enter the 2-7 step, otherwise gets back to the 2-4 step.The condition that control procedure finishes is: | Q
Opt1-Q
Opt2|＜ε, perhaps the result of last control surpasses threshold value Q
Th
The 2-7 step: after control procedure is finished, if the Q value result who obtains is lower than original Q
Th, illustrative system optimal performance deterioration then needs Q
ThBe reduced to a new level.If the Q value result who obtains is higher than original Q
Th, then can keep original threshold value.Enter the 2-1 step then.
According to mode of operation 3: instruction starts, and system will start receiving under the optimal control instruction situation.
The 3-1 step: control device is inquired about instruction stack.In distribution control structure, control device is meant cpu circuit 18, is to obtain instruction by its external interface 185; In centralized control structure, control device is meant controller 42, is to obtain instruction by its external interface 421.
The 3-2 step:, then enter the 3-3 step if there is not the property regulation order that manually issues in instruction stack; If the performance adjusting command is arranged, then enter the 3-4 step.
The 3-3 step:, get back to the 3-1 step through a delay period.
The 3-4 step: send and instruct, carry out the Q value and detect to receiving terminal.
The 3-5 step: the same 1-2 of implementation enters the 3-6 step after the execution
The 3-6 step: the same 1-3 of implementation enters the 3-7 step after the execution
3-7 step: when reaching stable optimization as a result the time, control procedure finishes to enter the 3-1 step, otherwise gets back to the 3-4 step.The condition that control procedure finishes is: | Q
Opt1-Q
Opt2|＜ε, perhaps the result of last control surpasses threshold value Q
Th
Fig. 4 is illustrated in the embodiment of system of the present invention under the multiple signals situation.In block diagram, transmitting terminal has multichannel input signal 1a, 1b,, multichannel continuous wave light source 11a, 11b,, multichannel intensity modulator 12a, 12b,, multichannel phase-modulator 13a, 13b,, multichannel intensity modulator drive circuit 14a, 14b,, multichannel phase-modulator drive circuit 15a, 15b,, multichannel intensity modulator drive circuit output signal 141a, 141b,, multichannel phase-modulator drive circuit output signal 151a, 151b,, multi-channel sampling coupler 16a, 16b,, a plurality of automatic power control circuitry 17a, 17b,, a plurality of cpu system 1ga, 18b, the control signal 181a of a plurality of phase-modulator drive circuits, 181b ... the control signal 182a of a plurality of intensity modulator drive circuits, 182b ..., the power selection signal 183a of a plurality of automatic power control circuitries, 183b,, the interface 184a of a plurality of control circuits and bus, 184b, receiving terminal multichannel input optical coupler 102a, 102b ... receiving terminal multi-channel sampling light signal 7a, 7b ..., receiving terminal multipath receiver 103a, 103b,, in Fig. 4, more than everyly all expressed 2 respectively, in fact can be a plurality of (more than 2), also can be many that are provided with arbitrarily.The centre wavelength difference of each light source.
In Fig. 4, multichannel continuous wave light source 11a, 11b,, multichannel intensity modulator 12a, 12b, multichannel phase-modulator 13a, 13b ... multichannel intensity modulator drive circuit 14a, 14b ..., multichannel phase-modulator drive circuit 15a, 15b,, multichannel intensity modulator drive circuit output signal 141a, 141b, multichannel phase-modulator drive circuit output signal 151a, 151b ... multi-channel sampling coupler 16a, 16b ..., a plurality of automatic power control circuitry 17a, 17b,, a plurality of cpu system 18a, 18b, the control signal 181a of a plurality of phase-modulator drive circuits, 181b ... the control signal 182a of a plurality of intensity modulator drive circuits, 182b ..., the power selection signal 183a of a plurality of automatic power control circuitries, 183b,, receiving terminal multichannel input optical coupler 102a, 102b, receiving terminal multipath receiver 103a, 103b ... respectively with the continuous wave light source 11 shown in Fig. 2, intensity modulator 12, phase-modulator 13b, intensity modulator drive circuit 14, phase-modulator drive circuit 15, intensity modulator drive circuit output signal 141, phase-modulator drive circuit output signal 151, sample coupler 16, automatic power control circuitry 17, cpu system 18, the control signal 181 of phase-modulator drive circuit, the control signal 182 of intensity modulator drive circuit, the power selection signal 183 of automatic power control circuitry, receiving terminal multichannel input optical coupler 102, receiver 103 functions and meaning come down to identical, so omit the explanation to them here.
In wavelength-division multiplex system, there is wave multiplexer 4 in transmitting terminal, multipath light signal is lumped together launch.The devices communicating bus 21 of transmitting terminal, with a terminal control unit 20 and a plurality of cpu system 18a, 18b ... be connected.More than each control circuit 20,18a, 18b ... be respectively 202 with the interface of bus, 184a, 184b ...Terminal control unit also possesses an Artificial Control interface 201.Terminal control unit 20 is connected with the routing forwarding device by 203.
At receiving terminal, light signal at first is divided into a plurality of optical channels by channel-splitting filter 5, enters receiver 103a respectively, 103b ...The multi-channel sampling light signal of receiving terminal selects the input port 7a of an optical switch (or optical switch group) 107 by multichannel, 7b ... input enters Q value tester 104 through output port 70 after the selection.Employed optical channel when the Q value tester is tested each time selects an optical switch 107 to select by the multichannel of receiving terminal controller 105 controls, selects signal in 53 outputs.
Under the multiple signals situation, still can realize distributing or centralized control.Centralized control in this case is the same with the centralized control of one-channel signal, no longer repeats.Automatic optimization method under the multiple signals situation is identical with flow process with the automatic optimization method of one-channel signal and control method shown in Figure 3.What need supplementary notes a bit is: can be optimized adjusting respectively to each optical channel, the passage of being tested is corresponding to regulating request, should comprise gap marker in the received control command of receiver controller 105, receiving terminal controller 105 is tested respective channel at startup Q value tester according to gap marker control optical switch 107.When test result feeds back to transmitting terminal, also should comprise gap marker among the result, after terminal control unit 20 will be confirmed gap marker and judge, when needs are regulated when action gap marker according to appointment, by bus 20 regulating command is sent to corresponding cpu control circuit (a plurality of cpu control circuit 18a, among the 18b).
Claims (9)
1, a kind of optical transmission system of transmitting terminal performance Automatic Optimal comprises transmitting terminal and receiving terminal two parts and transmission route (2) and monitor channel route (3);
Described transmitting terminal comprises: continuous wave light source (11), intensity modulator (12), phase-modulator (13), intensity modulated drive circuit (14), phase modulated drive circuit (15), sampled light coupler (16), automatic power control circuitry (17), cpu system (18), transmitting terminal routing forwarding device (19), output optical interface (10); A transmission signals part is suitably amplified through intensity modulator drive circuit (14) and the back of setovering forms drive signal access intensity modulator (12), continuous wave light source (11) is outputed to the light amplitude modulation of intensity modulator (12); Another part of transmission signals suitably amplifies through phase-modulator drive circuit (15) and the back of setover forms drive signal and inserts phase-modulator (13), exports light through intensity modulator (12) and passes through phase-modulator (13) adjustment of warbling again; After the signal process sample coupler (16) of modulation back output, enter transmission line through output optical interface (10); Coupler (16) is connected with automatic power control circuitry (17), under the control of the power selection level that cpu system (18) is exported, automatic power control circuitry (17) makes the light signal average power that outputs to transmission line locked by the FEEDBACK CONTROL to continuous wave light source (11); Cpu system (18) is controlled intensity modulator drive circuit (14), phase-modulator drive circuit (15), automatic power control circuitry (17), and link to each other with routing forwarding device (19), send instruction or data to it, also can receive its instruction of sending here or data;
Described receiving terminal comprises: input optical interface (101), input optical coupler (102), receiver (103), Q value tester (104), Controlled CPU (105), receiving terminal routing forwarding device (106); Light signal enters receiver (103) through input optical interface (101), input optical coupler (102); Described input optical coupler (102) connects Q value tester (104), this Q value tester (104) links to each other with Controlled CPU (105), this Controlled CPU (105) also links to each other with receiving terminal routing forwarding device (106), can send instruction or data by it, also can receive instruction or data by it;
Link to each other by described transmission route (2) between described output optical interface (10) and the input optical interface (101), transmitting terminal routing forwarding device (19) links to each other by described monitor channel route (3) with receiving terminal routing forwarding device (106).
2, a kind of optical transmission system of transmitting terminal performance Automatic Optimal comprises transmitting terminal and receiving terminal and centralized control point three parts, and transmission route (2) and transmitting terminal monitor channel route (31), receiving terminal monitor channel route (32);
Described transmitting terminal comprises: continuous wave light source (11), intensity modulator (12), phase-modulator (13), intensity modulated drive circuit (14), phase modulated drive circuit (15), sampled light coupler (16), automatic power control circuitry (17), cpu system (18), transmitting terminal routing forwarding device (19), output optical interface (10); A transmission signals part is suitably amplified through intensity modulator drive circuit (14) and the back of setovering forms drive signal access intensity modulator (12), continuous wave light source (11) is outputed to the light amplitude modulation of intensity modulator (12); Another part of transmission signals suitably amplifies through phase-modulator drive circuit (15) and the back of setover forms drive signal and inserts phase-modulator (13), exports light through intensity modulator (12) and passes through phase-modulator (13) adjustment of warbling again; After the signal process sample coupler (16) of modulation back output, enter transmission line through output optical interface (10); Coupler (16) is connected with automatic power control circuitry (17), under the control of the power selection level that cpu system (18) is exported, automatic power control circuitry (17) makes the light signal average power that outputs to transmission line locked by the FEEDBACK CONTROL to continuous wave light source (11); Cpu system (18) is controlled intensity modulator drive circuit (14), phase-modulator drive circuit (15), automatic power control circuitry (17), and link to each other with routing forwarding device (19), send instruction or data to it, also can receive its instruction of sending here or data;
Described receiving terminal comprises: input optical interface (101), input optical coupler (102), receiver (103), Q value tester (104), Controlled CPU (105), receiving terminal routing forwarding device (106); Light signal enters receiver (103) through input optical interface (101), input optical coupler (102); Described input optical coupler (102) connects Q value tester (104), this Q value tester (104) links to each other with Controlled CPU (105), this Controlled CPU (105) also links to each other with receiving terminal routing forwarding device (106), can send instruction or data by it, also can receive instruction or data by it;
Described centralized control point comprises master controller (42) and the centralized control point routing forwarding device of being controlled by described master controller (42) (41);
Link to each other by described transmission route (2) between described output optical interface (10) and the input optical interface (101), centralized control point routing forwarding device (41) links to each other with transmitting terminal routing forwarding device (19) by described transmitting terminal monitor channel route (31), links to each other with receiving terminal routing forwarding device (106) through described receiving terminal monitor channel route (32).
3, a kind of optical transmission system of transmitting terminal performance Automatic Optimal comprises transmitting terminal and receiving terminal two parts, and transmission route (2) and monitor channel route (3);
Described emission end branch comprises multichannel optical processing unit, wave multiplexer (4), light output interface (10), device bus (21), terminal control unit (20), transmitting terminal routing forwarding device (19); Optical processing unit, described every road comprises: continuous wave light source (11), intensity modulator (12), phase-modulator (13), intensity modulator drive circuit (14), phase-modulator drive circuit (15), sampled light coupler (16), automatic power control circuitry (17), cpu system (18); Every road transmission signals part is suitably amplified through intensity modulator drive circuit (14) and the back of setovering forms drive signal access intensity modulator (12), continuous wave light source (11) is outputed to the light amplitude modulation of intensity modulator (12); Another part of transmission signals suitably amplifies through phase-modulator drive circuit (15) and the back of setover forms drive signal and inserts phase-modulator (13), exports light through intensity modulator (12) and passes through phase-modulator (13) adjustment of warbling again; Every road signal is located to lump together the back through sampled light coupler (16) back of this unit at wave multiplexer (4) and is entered transmission line by light output interface (10); Terminal control unit (20) is connected with the cpu system (18) of optical processing unit, every road by device bus (21), and terminal control unit also is connected with transmitting terminal routing forwarding device (19);
Described receiving terminal comprises that partly input optical interface (101), channel-splitting filter (5), a plurality of input optical coupler, a plurality of receiver, multichannel select an optical switch or optical switch group (70), Q value tester (104), Controlled CPU (105), receiving terminal routing forwarding device (106); Light signal is by input optical interface (101) input channel-splitting filter, the demultiplexing optical channel, respectively through entering receiver behind the input optical coupler, after selecting an optical switch or optical switch group (70) to select by multichannel, the light signal of each input optical coupler sampling enters Q value tester (104), employed optical channel is controlled by Controlled CPU (105) during Q value tester (104) test, Controlled CPU (105) also is connected with receiving terminal routing forwarding device (106), can send instruction or data by it, also can receive instruction or data by it;
Link to each other by transmission route (2) between described output optical interface (10) and the input optical interface (101), transmitting terminal routing forwarding device (19) links to each other by monitor channel route (3) with receiving terminal routing forwarding device (106).
4, a kind of optical transmission system of transmitting terminal performance Automatic Optimal comprises transmitting terminal and receiving terminal and centralized control point three parts, and transmission route (2) and transmitting terminal monitor channel route (31), receiving terminal monitor channel route (32)
Described emission end branch comprises multichannel optical processing unit, wave multiplexer (4), light output interface (10), device bus (21), terminal control unit (20), transmitting terminal routing forwarding device (19); Optical processing unit, described every road comprises: continuous wave light source (11), intensity modulator (12), phase-modulator (13), intensity modulator drive circuit (14), phase-modulator drive circuit (15), sampled light coupler (16), automatic power control circuitry (17), cpu system (18); Every road transmission signals part is suitably amplified through intensity modulator drive circuit (14) and the back of setovering forms drive signal access intensity modulator (12), continuous wave light source (11) is outputed to the light amplitude modulation of intensity modulator (12); Another part of transmission signals suitably amplifies through phase-modulator drive circuit (15) and the back of setover forms drive signal and inserts phase-modulator (13), exports light through intensity modulator (12) and passes through phase-modulator (13) adjustment of warbling again; Every road signal is located to lump together the back through sampled light coupler (16) back of this unit at wave multiplexer (4) and is entered transmission line by light output interface (10); Terminal control unit (20) is connected with the cpu system (18) of optical processing unit, every road by device bus (21), and terminal control unit also is connected with transmitting terminal routing forwarding device (19);
Described receiving terminal comprises that partly input optical interface (101), channel-splitting filter (5), a plurality of input optical coupler, a plurality of receiver, multichannel select an optical switch or optical switch group (70), Q value tester (104), Controlled CPU (105), receiving terminal routing forwarding device (106); Light signal is by input optical interface (101) input channel-splitting filter, the demultiplexing optical channel, respectively through entering receiver behind the input optical coupler, after selecting an optical switch or optical switch group (70) to select by multichannel, the light signal of each input optical coupler sampling enters Q value tester (104), employed optical channel is controlled by Controlled CPU (105) during Q value tester (104) test, Controlled CPU (105) also is connected with receiving terminal routing forwarding device (106), can send instruction or data by it, also can receive instruction or data by it;
Described centralized control point comprises master controller (42) and the centralized control point routing forwarding device of being controlled by described master controller (42) (41);
Link to each other by transmission route (2) between described output optical interface (10) and the input optical interface (101), centralized control point routing forwarding device (41) links to each other with transmitting terminal routing forwarding device (19) by route (31), links to each other with receiving terminal routing forwarding device (106) through route (32).
5, a kind of method of carrying out transmitting terminal performance Automatic Optimal in optical transmission system may further comprise the steps:
Step 1: send and instruct, carry out the Q value and detect to receiving terminal;
Step 2: transmitting terminal power is carried out iteration control, detect receiving terminal Q value simultaneously and analyze, reach optimization aim until the Q value;
Step 3: the transmitting terminal phase place is carried out iteration control, detect receiving terminal Q value simultaneously and analyze, reach optimization aim until the Q value;
Step 4: judge the Q value that above step 2 and step 3 obtains, when satisfying the control precision requirement, adjusting stops;
It is characterized in that, in equipment running process, can use in the following various modes one or more: (1), start operation automatically; (2), spontaneous startup, promptly when the index deterioration surpasses threshold value, start automatically; (3), instruction starts.
6, the described method of carrying out transmitting terminal performance Automatic Optimal in optical transmission system of claim 5 is characterized in that, according to starting up's pattern, job step is:
1-1 sends and instructs to receiving terminal, carries out the Q value and detects;
1-2 carries out power adjustments, and the limit is regulated frontier inspection and surveyed, and forms power control iterative process, reaches an optimal value Q up to receiving terminal Q value
Opt1
The 1-3 adjusting of warbling, the limit is regulated frontier inspection and is surveyed, and forms phase-modulator and drives iterative process, reaches an optimal value Q up to receiving terminal Q value
Opt2
1-4 is when reaching stable optimization as a result the time, and control procedure finishes, otherwise gets back to step 1-2.
7, the described method of carrying out transmitting terminal performance Automatic Optimal in optical transmission system of claim 5 is characterized in that, according to spontaneous start-up mode, promptly system is realizing that automatically the receiving end signal performance is lower than Q
ThShi Qidong, job step is:
2-1 sends and instructs to receiving terminal, carries out the Q value and detects;
2-2 judges whether performance satisfies Q＞Q
Th, Q
ThIt is predefined value; If enter the 2-3 step; If not, enter step 2-4;
2-3 gets back to step 2-1 through a delay period;
2-4 carries out power adjustments, and the limit is regulated frontier inspection and surveyed, and forms power control iterative process, reaches an optimal value Q up to receiving terminal Q value
Opt1, enter step 2-5 after the execution;
The 2-5 adjusting of warbling, the limit is regulated frontier inspection and is surveyed, and forms phase-modulator and drives iterative process, reaches an optimal value Q up to receiving terminal Q value
Opt2, enter step 2-6 after the execution;
2-6 is when reaching stable optimization as a result the time, and control procedure finishes to enter step 2-7, otherwise gets back to step 2-4;
After the 2-7 control procedure is finished, if the Q value result who obtains is lower than original Q
Th, illustrative system optimal performance deterioration then needs Q
ThBe reduced to a new level; If the Q value result who obtains is higher than original Q
Th, then can keep original threshold value; Enter step 2-1 then.
8, the described method of carrying out transmitting terminal performance Automatic Optimal in optical transmission system of claim 5 is characterized in that, according to the instruction start-up mode, promptly system will start receiving under the optimal control instruction situation, and job step is:
The 3-1 control device is inquired about instruction stack;
3-2 then enters step 3-3 if there is not the optimal control instruction that manually issues in instruction stack; If the optimal control instruction is arranged, then enters step 3-4;
3-3 gets back to step 3-1 through a delay period;
3-4 sends and instructs to receiving terminal, carries out the Q value and detects;
3-5 carries out power adjustments, and the limit is regulated frontier inspection and surveyed, and forms power control iterative process, reaches an optimal value Q up to receiving terminal Q value
Opt1Enter step 3-6 after the execution;
The 3-6 adjusting of warbling, the limit is regulated frontier inspection and is surveyed, and forms phase-modulator and drives iterative process, reaches an optimal value Q up to receiving terminal Q value
Opt2Enter step 3-7 after the execution;
3-7 is when reaching stable optimization as a result the time, and control procedure finishes to enter step 3-1, otherwise gets back to step 3-4.
9, the described method of carrying out transmitting terminal performance Automatic Optimal in optical transmission system of the arbitrary claim of claim 6 to 8 is characterized in that, describedly reaches stable optimization result, is meant that the condition that control procedure finishes is: | Q
Opt1-Q
Opt2|＜ε, perhaps the result of last control surpasses threshold value Q
Th, wherein ε is predefined value.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002017521A2 (en) * | 2000-08-25 | 2002-02-28 | Ceyba Inc. | Method of adaptive signal degradation compensation |
| WO2002096003A1 (en) * | 2001-05-22 | 2002-11-28 | Axe, Inc. | Communication channel optimization using forward error correction statistics |
| CN1417968A (en) * | 2001-11-11 | 2003-05-14 | 华为技术有限公司 | Light signal regulating method and light transmission system for high-speed transmission system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2002017521A2 (en) * | 2000-08-25 | 2002-02-28 | Ceyba Inc. | Method of adaptive signal degradation compensation |
| WO2002096003A1 (en) * | 2001-05-22 | 2002-11-28 | Axe, Inc. | Communication channel optimization using forward error correction statistics |
| CN1417968A (en) * | 2001-11-11 | 2003-05-14 | 华为技术有限公司 | Light signal regulating method and light transmission system for high-speed transmission system |
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