JP5084567B2 - Dispersion compensation value automatic detection control device, method and program thereof - Google Patents

Description

  The present invention relates to a dispersion compensation value automatic detection control device for automatically determining a dispersion compensation value in dispersion compensation processing for a main signal received from a transmission line in a multiplex repeater optical transmission device for optical communication, its method, and its Regarding the program.

  Due to advances in optical transmission technology, 40Gbps transmission is becoming mainstream nowadays. As the transmission speed increases, more advanced techniques for improving transmission quality such as dispersion compensation are required.

  In the transmission of the main signal at the optical level by the multiplex repeater optical transmission device, it is necessary to perform dispersion compensation processing, particularly in order to perform transmission over a long distance section. If the transmission rate is up to 10 Gbps, dispersion compensation processing can be performed by obtaining dispersion information of the transmission line itself and determining a fixed dispersion compensation value based on the information.

  On the other hand, in the 40 Gbps transmission that will become the mainstream in the future, the allowable range of dispersion compensation value is narrow, even if fixed dispersion compensation value is determined by the same means as at 10 Gbps transmission, deviation occurs in the actual transmission line, There was a problem that there was a high possibility that the main signal could not be transmitted.

  Therefore, there is a technique for setting the dispersion correction amount. For example, Patent Document 1 discloses a variable dispersion compensation device, an optical transmission system using the same, and a dispersion compensation amount setting method.

  Patent Document 2 is a dispersion compensation system and dispersion compensation method for an optical fiber transmission line, Patent Document 3 is a dispersion compensation control apparatus and dispersion compensation control method, and Patent Document 4 is an optical communication that performs dynamic control. The present invention relates to a road dispersion compensation method and system.

In Patent Document 5, in order to detect the presence or absence of crosstalk due to wavelength shifts of wavelength-multiplexed light sources, the power of the light source to be investigated is reduced and dispersion compensation is re-evaluated.
JP 2006-174234 A Japanese Patent Laid-Open No. 2005-110008 Japanese Patent Laid-Open No. 2004-236097 JP 2004-274238 A JP 2007-104008 A

  However, in Patent Document 1, the final dispersion compensation value is not automatically determined, and the operator needs to determine the dispersion compensation value and control it manually from a control terminal. Since manual operation is required every time the dispersion compensation value is reset, there is a problem in that operational disadvantages occur.

  In Patent Document 2, the final dispersion compensation value is automatically determined, but a value estimated from a past experience value based on current weather information is used as a judgment material. Therefore, it can be applied when there is no problem with values estimated from past experience values, but there is a problem that it is difficult to apply to transmission in a region of 40 Gbps.

  Patent Document 3 has a problem that there is no means for narrowing down the dispersion compensation value, and the system is not controlled so as to obtain an optimum dispersion compensation value by stepping down the power of the light source.

  Since Patent Document 4 uses a dispersion value that is fixedly set in advance, there is a problem that it is difficult to apply to transmission in an area of 40 Gbps.

  Patent Document 5 only discloses that the power of the light source is reduced by one step, and there is a problem that the system is not controlled so as to obtain an optimum dispersion compensation value by reducing the power of the light source in steps. .

  The present invention has been made in view of the above, and in a situation where the dispersion compensation value cannot be uniquely determined only by the prior information, the dispersion compensation value automatic detection control apparatus, the method, and the dispersion compensation value are automatically determined. The purpose is to obtain the program.

  In order to solve the above-described problem, the dispersion compensation value automatic detection control apparatus according to the present invention is a dispersion compensation value automatic detection control for determining a dispersion compensation value for a main signal received from a transmission line of a multiplex repeater optical transmission apparatus. A dispersion compensation unit that performs dispersion compensation processing stepwise with respect to the main signal at different dispersion compensation values, and whether or not the main signal is synchronized; a synchronization detection result for each different dispersion compensation value A synchronization detection unit that detects the signal as a signal, a code error detection unit that detects the correctness of the code of the main signal as a code error detection result signal for each different dispersion compensation value, the synchronization detection result signal, and the code error detection result signal A dispersion compensation value range in which the main signals are synchronized and a code error does not occur is determined, and it is determined whether the extracted dispersion compensation value range is within a preset threshold, and the dispersion compensation is performed. Control A dispersion compensation control unit that, when the range of the extracted dispersion compensation value exceeds the threshold, the dispersion compensation unit controls the range of the extracted dispersion compensation value under the control of the dispersion compensation control unit. Then, the main signal is subjected to dispersion compensation processing step by step and the main signal is attenuated, and the synchronization detection unit re-synchronizes the attenuated main signal for each different dispersion compensation value. Detecting a detection result signal, the code error detection unit detects a code error detection result signal again for each of different dispersion compensation values for the attenuated main signal, and the dispersion compensation control unit Based on the synchronization detection result signal and the code error detection result signal again, the dispersion compensation value range in which the main signal is synchronized and the code error does not occur is re-extracted. When the threshold is exceeded , Wherein the main signal by further attenuated to the dispersion compensation unit, characterized in that to perform the dispersion compensation processing of the re.

  In order to solve the above-described problem, the dispersion compensation value automatic detection control method according to the present invention is a dispersion compensation value automatic detection control for determining a dispersion compensation value for a main signal received from a transmission line of a multiplex repeater optical transmission apparatus. A method for synchronously detecting, for each dispersion compensation value, a dispersion compensation procedure for performing dispersion compensation processing in stages with different dispersion compensation values for the main signal, and whether or not the main signal is synchronized. A synchronization detection procedure to detect as a result signal; a code error detection procedure to detect the correctness of the sign of the main signal as a code error detection result signal for each different dispersion compensation value; and the synchronization detection result signal and the code error detection Based on a result signal, a dispersion compensation value range in which the main signal is synchronized and a code error does not occur is extracted, and it is determined whether or not the extracted dispersion compensation value range is within a preset threshold value. When the range of the extracted dispersion compensation value exceeds the threshold, the dispersion compensation process is performed again on the main signal stepwise within the range of the extracted dispersion compensation value; and Re-dispersion compensation procedure for attenuating the main signal, re-synchronization detection procedure for detecting a synchronization detection result signal for each different dispersion compensation value for the attenuated main signal, and the attenuated main signal The main signal is synchronized based on a re-code error detection procedure for detecting a re-code error detection result signal for each different dispersion compensation value, and the re-synchronization detection result signal and the re-code error detection result signal. And re-extracting a dispersion compensation value range in which no code error occurs, and if the re-extracted dispersion compensation value range exceeds the threshold, the main signal is further attenuated in the re-dispersion compensation procedure, Again And re-dispersion compensation control procedure to perform the dispersion compensation processing, and further comprising a.

  In order to solve the above-described problem, the dispersion compensation value automatic detection control program according to the present invention is a dispersion compensation value automatic detection control for determining a dispersion compensation value for a main signal received from a transmission line of a multiplex repeater optical transmission apparatus. The program detects the dispersion compensation processing stepwise with respect to the main signal with different dispersion compensation values and whether or not the main signal is synchronized as a synchronization detection result signal for each different dispersion compensation value. Based on the synchronization detection processing, the code error detection processing for detecting the correctness of the code of the main signal as a code error detection result signal for each different dispersion compensation value, and the synchronization detection result signal and the code error detection result signal Then, a dispersion compensation value range in which the main signal is synchronized and no code error occurs is extracted, and a dispersion compensation control process for determining whether or not the extracted dispersion compensation value range is within a preset threshold value. And when the range of the extracted dispersion compensation value exceeds the threshold, the dispersion compensation process is performed again on the main signal stepwise within the range of the extracted dispersion compensation value. Re-dispersion compensation processing for attenuating the main signal; re-synchronization detection processing for detecting a re-synchronization detection result signal for each different dispersion compensation value for the attenuated main signal; and the attenuated main signal For the signal, based on the re-code error detection process for detecting the re-code error detection result signal for each different dispersion compensation value, and the re-synchronization detection result signal and the re-code error detection result signal, the main signal is A range of dispersion compensation values that are synchronized and in which no code error occurs is re-extracted. When the range of the dispersion compensation values that have been re-extracted exceeds the threshold value, the main signal is further attenuated to perform the re-dispersion compensation processing. The And re-dispersion compensation control process to I, further characterized in that to be executed by a computer.

  According to the present invention, when the range of the dispersion compensation value extracted based on the synchronization detection result signal and the code error detection result signal after the dispersion compensation processing exceeds the threshold, the main signal is attenuated and the dispersion compensation processing and the synchronization detection result are attenuated. The signal and the code error detection result signal are output again, and based on the second synchronization detection result signal and the code error detection result signal, the range of the dispersion compensation value in which the main signal is synchronized and the code error does not occur is re-extracted. If the range of the re-extracted dispersion compensation value still exceeds the above-mentioned threshold, the dispersion compensation value is further attenuated and the dispersion compensation process is performed. Thus, it is possible to obtain a dispersion compensation value automatic detection control apparatus, a method thereof, and a program thereof that automatically determine the dispersion compensation value.

  Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing a configuration of a dispersion compensation value automatic detection control device 5 according to an embodiment of the present invention.

  Referring to FIG. 1, the dispersion compensation value automatic detection control device 5 according to the present embodiment performs dispersion compensation processing on the optical level main signal received from the transmission path, and outputs the dispersion compensation value to the synchronization detection unit 2. Compensation unit 1 detects whether or not the main signal is synchronized, outputs the result to the dispersion compensation control unit 4 as a synchronization detection result signal, and outputs the main signal to the code error detection unit 3 Whether or not a code error alarm state is detected, the result is output to the dispersion compensation control unit 4 as a code error detection result signal, and the code error detection unit 3 that outputs the main signal and synchronization detection from the synchronization detection unit 2 A dispersion compensation control unit 4 that receives a result signal and a code error detection result signal from the code error detection unit 3 and outputs a dispersion compensation value processed by the dispersion compensation unit 1 to the dispersion compensation unit 1 as a control signal; Prepare.

  Here, FIG. 2 is a diagram illustrating a detailed configuration inside the dispersion compensator 1.

  In FIG. 2, the dispersion compensation unit 1 includes optical signal switching units 11, 12, 13, 14, and 15 that perform dispersion compensation processing using a dispersion compensation value transmitted by a control signal from the dispersion compensation control unit 4. Fixed dispersion compensators 16, 17, 18, and 19, and optical signal switching units 11, 12, 13, 14, 15, which are circuits that perform dispersion compensation processing according to a dispersion compensation value set in advance with respect to the main signal to be processed And a light signal attenuator 22 for attenuating the main signal.

Different dispersion compensation values are set in the fixed dispersion compensation units 16, 17, 18, and 19, and the following dispersion compensation values are set in the present embodiment.
Fixed dispersion compensator 16 = 50 ps / nm
Fixed dispersion compensation unit 17 = 100 ps / nm
Fixed dispersion compensator 18 = 200 ps / nm
Fixed dispersion compensation unit 19 = 400 ps / nm

  The optical signal switching units 11, 12, 13, 14, and 15 are circuits that output the input main signal with the optical level as it is. There are two output ports, one connected to the adjacent fixed dispersion compensator, the other connected to the next optical signal switching unit, and outputs the main signal to one of these ports . However, the optical signal switching unit 15 only outputs to the optical signal attenuation unit 22.

  The optical signal attenuating unit 22 outputs the input optical signal without attenuation, or attenuates and outputs the input optical signal according to the attenuation amount transmitted from the control unit 21. The optical signal output from the optical signal attenuation unit 22 is input to the synchronization detection unit 2.

  The control unit 21 controls switching of output paths of the optical signal switching units 11, 12, 13, 14, and 15 in accordance with the dispersion compensation value transmitted by the control signal from the dispersion compensation control unit 4.

  Here, FIG. 3 is a diagram illustrating a main signal path of the dispersion compensator 1 when the dispersion compensation value transmitted by the control signal from the dispersion compensation controller 4 is 150 ps / nm.

  In the present embodiment, since the sum of the dispersion compensation value of fixed dispersion compensation unit 16 and the dispersion compensation value of fixed dispersion compensation unit 17 is 150 ps / nm, the main signal is input to fixed dispersion compensation units 16 and 17. Like that. Therefore, the control part 21 controls so that each optical signal switching part becomes the following.

Optical signal switching unit 11 = Connected to fixed dispersion compensation unit 16 Optical signal switching unit 12 = Connected to fixed dispersion compensation unit 17 Optical signal switching unit 13 = Connected to optical signal switching unit 14 Optical signal switching unit 14 = Optical signal switching unit 15 By this control, the dispersion compensation unit 1 as a whole performs dispersion compensation processing at 150 ps / nm.

  The control unit 21 receives a control signal related to the optical signal attenuation amount from the dispersion compensation control unit 4. The control unit 21 controls the attenuation of the optical signal performed by the optical signal attenuation unit 22 based on the input control signal.

  The synchronization detection unit 2 detects synchronization signal information in the main signal input from the dispersion compensation unit 1 and determines whether the main signal is synchronized or out of synchronization.

  Furthermore, the synchronization detection unit 2 outputs the determination result relating to the synchronization state or the out-of-synchronization state to the dispersion compensation control unit 4 as a synchronization detection result signal.

  The code error detection unit 3 performs a parity signal check process on the main signal, thereby confirming whether or not the threshold value is equal to or higher than a preset threshold value that causes a code error alarm.

  If it is equal to or greater than the threshold value, the code error alarm is present, and if it is less than the threshold value, the code error alarm is absent, and the detection result is output to the dispersion compensation controller 4 as a code error detection result signal.

  The dispersion compensation control unit 4 transmits a plurality of dispersion compensation values to the dispersion compensation unit 1 as control signals. Further, based on the synchronization detection result signal input from the synchronization detector 2 and the code error detection result signal input from the code error detector 3, it is determined whether or not the currently set dispersion compensation value is appropriate.

  The dispersion compensation control unit 4 first extracts a dispersion compensation value in the “synchronized state” from the synchronization detection result signal. Subsequently, three dispersion compensation values of “no code error alarm” are further extracted from the dispersion compensation values in the “synchronized state” as dispersion compensation threshold values based on the code error detection result signal. In one example, the dispersion compensation values to be extracted are the values of the left and right limit points where there is no code error and the points located near the middle of them.

  Subsequently, it is confirmed whether the narrowed dispersion compensation value is within the extracted ternary value or exceeded, and if it exceeds the ternary value, the input level of the received optical signal is intentionally attenuated to By degrading the ratio of the noise signal to the signal, a state in which a code error alarm is likely to occur is set.

  In a state where the code error alarm is likely to be issued, the presence / absence of the code error alarm is confirmed again by the code error detection result signal.

  As described above, the amount of optical attenuation is further increased as necessary, and the dispersion compensation value that finally becomes “synchronized” and “no code error alarm” is narrowed down to three values or less.

  Further, an optimum value is determined from the narrowed dispersion compensation values, and is output as a final dispersion compensation value to the dispersion compensation unit 1 by a control signal.

  Next, the operation of the dispersion compensation value automatic detection control apparatus according to this embodiment will be described with reference to the drawings. Here, FIG. 5 is an example of a determination flow in the dispersion compensation control unit 4.

  The dispersion compensation control unit 4 receives a control from the outside (for example, a device main control unit that controls the entire device) and starts processing for determining a dispersion compensation value.

  In the present embodiment, a case is shown in which an optimum dispersion compensation value is determined from 16 dispersion compensation values in increments of 50 ps / nm in the range of 0 ps / nm to 750 ps / nm.

  The dispersion compensation controller 4 first outputs 0 ps / nm to the dispersion controller 1 as a control signal (step S101).

In the dispersion control unit 1, in order to perform dispersion compensation processing at 0 ps / nm which is a dispersion compensation value input by a control signal from the dispersion compensation control unit 4, the optical signal switching units 11, 12, 13 from the control unit 21. , 14 are controlled. Specifically, as shown in FIG. 4, the outputs of the optical signal switching units 11, 12, 13, and 14 are set as follows.
Optical signal switching unit 11 = Connection to optical signal switching unit 12 Optical signal switching unit 12 = Connection to optical signal switching unit 13 Optical signal switching unit 13 = Connection to optical signal switching unit 14 Optical signal switching unit 14 = Optical signal switching unit 15 (Only the optical signal switching unit 15 always outputs an optical signal to the outside via the optical signal attenuating unit 22)

  The synchronization detection unit 2 outputs the synchronization detection result for the input main signal to the dispersion compensation control unit 4 (step S102).

  The dispersion compensation control unit 4 determines from the synchronization detection result signal from the synchronization detection unit 2 whether the currently set dispersion compensation value is “synchronized state” or “out of synchronization state”, and stores information. Temporarily save it in the internal storage.

  The confirmation of the synchronization state in step S102 is performed in units of 50 ps / nm in the range of 0 to 750 ps / nm.

  In the subsequent step S103, it is determined whether or not all the confirmation of the synchronization state has been performed in the range of 0 to 750 ps / nm. If all the confirmations have been confirmed (YES), the procedure proceeds to step S105.

  On the other hand, when all of the confirmation of the synchronization state is not performed in the range of 0 to 750 ps / nm (NO), a new dispersion compensation value obtained by adding 50 ps / nm to the currently set dispersion compensation value is reset. (Step S104), the procedure is returned to Step S102, and the synchronization state is confirmed again.

  In step S <b> 105, the dispersion compensation control unit 4 outputs the minimum value from among the dispersion compensation values in the “synchronized state” to the dispersion compensation unit 1 as a control signal. As an example, when the “synchronization state” is 200 ps / nm to 500 ps / nm, the dispersion compensator 1 first performs 200 ps / nm processing on the main signal.

  The main signal is input to the code error detection unit 3 via the synchronization detection unit 2, and the code error detection unit 3 outputs the code error detection result to the dispersion compensation control unit 4 (step S106). The dispersion compensation control unit 4 determines from the code error detection result signal from the code error detection unit 3 whether the currently set dispersion compensation value is “no code error alarm” or “with code error alarm”. The information is determined and information is temporarily stored in an internal storage unit or the like.

  Subsequently, in step S107, it is confirmed whether or not the currently set dispersion compensation value is the maximum value in the “synchronized state” (in this example, 500 ps / nm). The procedure moves to step S109 assuming that the dispersion compensation value is confirmed.

  On the other hand, if it is not the maximum value (NO), a new dispersion compensation value obtained by adding 50 ps / nm to the currently set dispersion compensation value is reset (step S108), the procedure is returned to step S106, and the code is re-encoded. Error confirmation is repeated up to the maximum value in the “synchronized state” (500 ps / nm in this example).

  After finishing up to the maximum value in the “synchronous state” (500 ps / nm in this example), the dispersion compensation control unit 4 subsequently determines the number of dispersion compensation values that are “synchronous state” and “no code error alarm”. And whether it is less than or equal to the ternary value is confirmed (step S109).

  As an example, when the ternary value exceeding 200 ps / nm to 400 ps / nm is obtained in units of 50 ps / nm (NO), the optical signal attenuation unit 22 in the dispersion compensation unit 1 receives the signal. In this example, an optical signal attenuation amount is output to the dispersion compensator 1 as a control signal so as to attenuate the optical signal by 1 dB in this example (step S110).

  It should be noted that the amount of optical signal attenuation to be attenuated by one-time control is reduced stepwise as in this example, or when the synchronization detection unit 2, the code error detection unit 3 and the like are reduced to near the minimum light reception level at which light can be received. The dispersion compensation control unit 4 can control either of them.

  In the optical signal attenuating unit 22 in the dispersion compensating unit 1, the optical signal input from the optical signal switching unit 15 is attenuated according to the optical signal attenuation amount from the control unit 21 and output to the synchronization detecting unit 2.

  In step S <b> 111, the dispersion compensation control unit 4 outputs the smallest value among the dispersion compensation values “no code error alarm” to the dispersion compensation unit 1 as a control signal. As an example, when no code error alarm is 200 ps / nm to 400 ps / nm, the dispersion compensator 1 first performs a process of 200 ps / nm on the main signal.

  The main signal is input to the code error detection unit 3 via the synchronization detection unit 2, and the code error detection unit 3 outputs the code error detection result to the dispersion compensation control unit 4 (step S112).

  The dispersion compensation control unit 4 determines from the code error detection result signal from the code error detection unit 3 whether the currently set dispersion compensation value is “no code error alarm” or “with code error alarm”. The information is determined and information is temporarily stored in an internal storage unit or the like.

  Subsequently, in step S113, it is confirmed whether or not the currently set dispersion compensation value is the maximum value (400 ps / nm in this example) at “no sign error alarm”. If it is the maximum value (YES), The procedure moves to step S115 on the assumption that all variance values have been confirmed.

  On the other hand, if it is not the maximum value (NO), a new dispersion compensation value obtained by adding 50 ps / nm to the currently set dispersion compensation value is reset (step S114), the procedure is returned to step S112, and the code is re-encoded. The error check is repeated up to the maximum value (400 ps / nm in this example) for “no sign error alarm”.

  After finishing up to the maximum value (“400 ps / nm” in this example) with “no sign error alarm”, the dispersion compensation control unit 4 continues to be the dispersion compensation value “synchronized” and “no sign error alarm”. It is confirmed again whether the number of is less than the ternary value or exceeds the ternary value (step S115). As a result, as an example, when the ternary value is exceeded such as four values of 200 ps / nm to 350 ps / nm (NO), the optical signal attenuation is further added by 1 dB to 2 dB (step S114), and dispersion compensation is performed again. It outputs to the part 1 as a control signal, and repeats the process after the above-mentioned step S110.

  As a result of repetition, the number of dispersion compensation values that are “synchronized state” and “no sign error alarm” in step S115 became three or less (for example, three values of 200 ps / nm to 300 ps / nm). In the case (YES), the narrowing is completed.

  One optimum value is determined from the result of this narrowing down (step S116). In this example, the center value of the left and right limit points where there is no code error is determined as the optimum value. Here, 250 ps / nm is determined as the optimum value and is output to the dispersion compensator 1 as a control signal. In addition, the fact that the dispersion compensation value has been determined is notified as an execution result to the outside (device main control unit or the like).

  In addition, when the limit point where there is no code error extracted by attenuating the main signal converges to a single value, the value may be determined as the optimum value.

  In the above embodiment, four fixed dispersion compensation units are connected in the dispersion compensation unit 1 to realize a total of 16 dispersion compensation values. However, the number of fixed dispersion compensation units and individual fixed dispersion compensation values are realized. By changing the dispersion compensation value of the compensation unit, various conditions of the transmission path can be optimized.

  Regarding the method for determining the optimum value, the synchronization information and the code error information are used as the determination information in the present embodiment, but it may be determined by adding other information.

  Furthermore, among a plurality of dispersion compensation values determined to be applicable, several ideas can be applied to which value is determined as the optimum value. In the present embodiment, the center value of the left and right limit points where there is no code error is the optimum value, but application such as the largest value is conceivable. In that case, in the judgment processing by the software of the dispersion compensation control unit 4 or the like, a logic for selecting the maximum value in addition to the center value is incorporated in advance, and it is specified which is determined in the case of external control. Can be realized.

  The present invention can be realized by hardware, software, or a combination thereof.

  The present invention automatically performs dispersion compensation value determination in a situation where dispersion compensation value cannot be uniquely determined only by prior information in dispersion compensation processing for a main signal received from a transmission line in a multiplex repeater optical transmission apparatus. Can be used in cases.

It is a figure which shows the structure of the automatic detection control apparatus of the dispersion compensation value which concerns on embodiment of this invention. It is a figure which shows the detailed structure inside a dispersion compensation part. It is a figure which shows the path | route of the main signal of a dispersion compensation part in case the dispersion compensation value transmitted by the control signal from the dispersion compensation control part 4 is 150 ps / nm. It is a figure which shows the path | route of the main signal of a dispersion compensation part when a dispersion compensation part performs a dispersion compensation process by the dispersion compensation value of 0 ps / nm. It is an example of the judgment flow in a dispersion compensation control part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Dispersion compensation part 2 Synchronization detection part 3 Code error detection part 4 Dispersion compensation control part 11, 12, 13, 14, 15 Optical signal switching part 16, 17, 18, 19 Fixed dispersion compensation part 21 Control part 22 Optical signal attenuation part

Claims (21)

A dispersion compensation value automatic detection controller for determining a dispersion compensation value for a main signal received from a transmission line of a multiplex repeater optical transmission device,
A dispersion compensation unit that performs dispersion compensation processing in stages with different dispersion compensation values for the main signal;
A synchronization detection unit that detects whether the main signal is synchronized as a synchronization detection result signal for each different dispersion compensation value;
A code error detection unit for detecting whether the sign of the main signal is correct or not as a code error detection result signal for each different dispersion compensation value;
Based on the synchronization detection result signal and the code error detection result signal, a dispersion compensation value range in which the main signal is synchronized and no code error occurs is extracted, and the extracted dispersion compensation value range is a preset threshold value. A dispersion compensation control unit that determines whether or not to be within and controls the dispersion compensation unit;
With
When the range of the extracted dispersion compensation value exceeds the threshold,
The dispersion compensation unit performs the dispersion compensation process again on the main signal stepwise in the range of the extracted dispersion compensation value under the control of the dispersion compensation control unit, and attenuates the main signal,
The synchronization detection unit detects a second synchronization detection result signal for each different dispersion compensation value for the attenuated main signal,
The code error detection unit detects a code error detection result signal again for each of different dispersion compensation values for the attenuated main signal,
The dispersion compensation control unit re-extracts a range of dispersion compensation values in which the main signal is synchronized and no code error occurs based on the second synchronization detection result signal and the second code error detection result signal, When the range of the re-extracted dispersion compensation value exceeds the threshold value, the dispersion compensation unit further attenuates the main signal and performs the dispersion compensation process again. Control device.   The dispersion compensation control unit sets the center value of the dispersion compensation value range as an optimum value when the dispersion compensation value range in which the main signal is synchronized and a code error does not occur is within the threshold value. The dispersion compensation value automatic detection control apparatus according to claim 1.   The dispersion compensation control unit sets the maximum value of the dispersion compensation value range as an optimum value when the dispersion compensation value range in which the main signal is synchronized and a code error does not occur is within the threshold value. The dispersion compensation value automatic detection control apparatus according to claim 1.   The dispersion compensation control unit causes the dispersion compensation unit to attenuate the main signal stepwise until a dispersion compensation value in which the main signal is synchronized and a code error does not occur converges to a single value within the threshold value. 2. The dispersion compensation value automatic detection control apparatus according to claim 1, wherein the dispersion compensation process is performed again. When the dispersion compensation unit performs the dispersion compensation process by gradually increasing the dispersion compensation value for each predetermined value,
The first dispersion compensation value is a lower limit value causing no code error, the second dispersion compensation value obtained by adding one of the predetermined values to the first dispersion compensation value is also free of a code error, and When the third dispersion compensation value obtained by adding one of the predetermined values to the dispersion compensation value of 2 is an upper limit value causing no code error, from the first dispersion compensation value to the third dispersion compensation value. range automatic detection control unit of the dispersion compensation value according to any one of claims 1 to 4, characterized in that the range of the threshold. The dispersion compensation unit has a plurality of fixed dispersion compensation units having inherent dispersion compensation values,
6. The dispersion according to claim 1, wherein a dispersion compensation value can be changed by combining a desired number of the fixed dispersion compensators under the control of the dispersion compensation controller. Compensation value automatic detection controller. The code error detector, any one of claims 1 to 6, characterized in that the main signal to detect the code error detection result signal and the code error detection result signal of the re the dispersion compensation value to be synchronized A dispersion compensation value automatic detection control device according to claim 1. A dispersion compensation value automatic detection control method for determining a dispersion compensation value for a main signal received from a transmission line of a multiplex repeater optical transmission device,
A dispersion compensation procedure for performing dispersion compensation processing in stages with different dispersion compensation values for the main signal;
A synchronization detection procedure for detecting whether or not the main signal is synchronized as a synchronization detection result signal for each of different dispersion compensation values;
A code error detection procedure for detecting the correctness of the sign of the main signal as a code error detection result signal for each different dispersion compensation value;
Based on the synchronization detection result signal and the code error detection result signal, a dispersion compensation value range in which the main signal is synchronized and no code error occurs is extracted, and the extracted dispersion compensation value range is a preset threshold value. Dispersion compensation control procedure for determining whether or not within,
With
When the range of the extracted dispersion compensation value exceeds the threshold,
A redispersion compensation procedure for performing dispersion compensation processing again on the main signal stepwise in a range of the extracted dispersion compensation value and attenuating the main signal;
A resynchronization detection procedure for detecting the synchronization detection result signal again for each of the different dispersion compensation values for the attenuated main signal;
A re-code error detection procedure for detecting a code error detection result signal again for each of the different dispersion compensation values for the attenuated main signal;
Based on the second synchronization detection result signal and the second code error detection result signal, a range of dispersion compensation values in which the main signal is synchronized and no code error occurs is re-extracted. A re-dispersion compensation control procedure for further attenuating the main signal in the re-dispersion compensation procedure and performing the second dispersion compensation process when the range exceeds the threshold;
A dispersion compensation value automatic detection control method, further comprising: The dispersion compensation control procedure and the re-dispersion compensation control procedure are such that, when the dispersion compensation value range in which the main signal is synchronized and no code error occurs is within the threshold value, the center value of the dispersion compensation value range is an optimum value. The dispersion compensation value automatic detection control method according to claim 8 , wherein: In the dispersion compensation control procedure and the re-dispersion compensation control procedure, when the dispersion compensation value range in which the main signal is synchronized and no code error occurs is within the threshold value, the maximum value of the dispersion compensation value range is set to an optimum value. The dispersion compensation value automatic detection control method according to claim 8 , wherein: The dispersion compensation control procedure and the redispersion compensation control procedure are the same as those in the redispersion compensation procedure until a dispersion compensation value in which the main signal is synchronized and a code error does not occur converges to a single value within the threshold. 9. The dispersion compensation value automatic detection control method according to claim 8 , wherein the signal is attenuated stepwise to perform the dispersion compensation process again. In the dispersion compensation procedure, the dispersion compensation value is increased step by step for each predetermined value,
The first dispersion compensation value is a lower limit value causing no code error, the second dispersion compensation value obtained by adding one of the predetermined values to the first dispersion compensation value is also free of a code error, and When the third dispersion compensation value obtained by adding one of the predetermined values to the dispersion compensation value of 2 is an upper limit value causing no code error, from the first dispersion compensation value to the third dispersion compensation value. automatic detection control method of the dispersion compensation value according to any one of claims 8 to 1 1 range is characterized by comprising a range of said threshold value The dispersion compensation procedure and the re-dispersion compensation procedure have a plurality of fixed dispersion compensation procedures related to inherent dispersion compensation values,
The fixed dispersion compensation procedure, by combining the desired number, the automatic detection control method of the dispersion compensation value according to any one of claims 8 to 1 2, characterized in that it is capable of changing the dispersion compensation value. The code error detection procedure and the recode error detection procedure detect the code error detection result signal and the code error detection result signal again with respect to a dispersion compensation value with which the main signal is synchronized, respectively. automatic detection control method of the dispersion compensation value according to any one of 8 to 1 3. A dispersion compensation value automatic detection control program for determining a dispersion compensation value for a main signal received from a transmission line of a multiplex repeater optical transmission device,
Dispersion compensation processing performed stepwise with different dispersion compensation values for the main signal;
A synchronization detection process for detecting whether or not the main signal is synchronized as a synchronization detection result signal for each different dispersion compensation value;
A code error detection process for detecting the code error of the main signal as a code error detection result signal for each different dispersion compensation value;
Based on the synchronization detection result signal and the code error detection result signal, a dispersion compensation value range in which the main signal is synchronized and no code error occurs is extracted, and the extracted dispersion compensation value range is a preset threshold value. Dispersion compensation control processing for determining whether or not within,
To the computer,
When the range of the extracted dispersion compensation value exceeds the threshold,
Re-dispersion compensation processing for performing the dispersion compensation processing again on the main signal stepwise within the range of the extracted dispersion compensation value and attenuating the main signal;
A resynchronization detection process for detecting a synchronization detection result signal again for each different dispersion compensation value for the attenuated main signal;
Recoding error detection processing for detecting a code error detection result signal again for each of different dispersion compensation values for the attenuated main signal;
Based on the second synchronization detection result signal and the second code error detection result signal, a range of dispersion compensation values in which the main signal is synchronized and no code error occurs is re-extracted. If the range exceeds the threshold value, the main signal is further attenuated, and the redispersion compensation control process for performing the redispersion compensation process;
Is further executed by a computer, and a dispersion compensation value automatic detection control program. In the dispersion compensation control process and the re-dispersion compensation control process, if the dispersion compensation value range in which the main signal is synchronized and a code error does not occur is within the threshold value, the center value of the dispersion compensation value range is an optimum value. The dispersion compensation value automatic detection control program according to claim 15 , wherein: In the dispersion compensation control process and the re-dispersion compensation control process, when the dispersion compensation value range in which the main signal is synchronized and no code error occurs is within the threshold value, the maximum value of the dispersion compensation value range is an optimum value. The dispersion compensation value automatic detection control program according to claim 15 , wherein: In the dispersion compensation control process and the re-dispersion compensation control process, the main signal is attenuated step by step until a dispersion compensation value in which the main signal is synchronized and a code error does not occur converges to a single value within the threshold value. is allowed to, claim 1 5 automatic detection control program of the dispersion compensation value according to, characterized in that to perform the re-dispersion compensation processing. In the case where the dispersion compensation processing is performed by gradually increasing the dispersion compensation value for each predetermined value,
The first dispersion compensation value is a lower limit value causing no code error, the second dispersion compensation value obtained by adding one of the predetermined values to the first dispersion compensation value is also free of a code error, and When the third dispersion compensation value obtained by adding one of the predetermined values to the dispersion compensation value of 2 is an upper limit value causing no code error, from the first dispersion compensation value to the third dispersion compensation value. claim 1 5 to 1 8 or the automatic detection control program of the dispersion compensation value according to one of the range is characterized by comprising a range of said threshold value. The dispersion compensation process and the re-dispersion compensation process have a plurality of fixed dispersion compensation processes related to inherent dispersion compensation values,
The dispersion compensation value automatic detection control program according to any one of claims 15 to 19 , wherein the dispersion compensation value can be changed by combining a desired number of fixed dispersion compensation processes. The code error detection process and the re-code error detection process detect the code error detection result signal and the code error detection result signal again with respect to a dispersion compensation value synchronized with the main signal, respectively. claim 1 5 to 2 0 either automatic detection control program of the dispersion compensation value according to one of.

Images