WO2010031239A1 - 一种优化光接收机判决电平的方法及装置 - Google Patents

一种优化光接收机判决电平的方法及装置 Download PDF

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Publication number
WO2010031239A1
WO2010031239A1 PCT/CN2009/000833 CN2009000833W WO2010031239A1 WO 2010031239 A1 WO2010031239 A1 WO 2010031239A1 CN 2009000833 W CN2009000833 W CN 2009000833W WO 2010031239 A1 WO2010031239 A1 WO 2010031239A1
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Prior art keywords
decision level
error correction
value
forward error
error rate
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PCT/CN2009/000833
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English (en)
French (fr)
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彭肖
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中兴通讯股份有限公司
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to KR1020117007864A priority Critical patent/KR101223053B1/ko
Priority to EP09813960.3A priority patent/EP2337246B1/en
Priority to BRPI0919070A priority patent/BRPI0919070A2/pt
Priority to US13/119,172 priority patent/US8565595B2/en
Priority to ES09813960.3T priority patent/ES2499033T3/es
Priority to JP2011527181A priority patent/JP5149996B2/ja
Publication of WO2010031239A1 publication Critical patent/WO2010031239A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/60—Receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/60—Receivers
    • H04B10/66—Non-coherent receivers, e.g. using direct detection
    • H04B10/69—Electrical arrangements in the receiver
    • H04B10/695—Arrangements for optimizing the decision element in the receiver, e.g. by using automatic threshold control
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/03—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words

Definitions

  • the present invention relates to the field of optical communication technologies, and in particular, to a method and device for optimizing a decision level of an optical receiver
  • the optical transmitter at the transmitting end converts the 0 and 1 digital electrical signals into optical signals for transmission in the optical fiber
  • the optical receiver at the receiving end undergoes photoelectric conversion to restore 0 and 1 digital electrical signals.
  • the decision level of the optical receiver is at an average value of 50%, and the 0 and 1 signals can be accurately determined.
  • the signal 1 and the signal 0 are distorted. Therefore, the decision level of the optical receiver needs to be adjusted to accurately determine the 0 and 1 signals.
  • the FEC (Forward Error Correction) codec method is mainly used in the optical communication system to detect and correct the 0 and 1 errors.
  • Optimizing the optical receiver decision level can effectively reduce the number of 0 and 1 errors before forward error correction, that is, the number of errors before forward error correction.
  • the error rate before the current error correction is the smallest
  • the error rate after the forward error correction is also the smallest, that is, the error rate of the system is the smallest. Therefore, the error rate before forward error correction can be used as the basis for the optical receiver decision level optimization.
  • the optical receiver decision level optimization method disclosed in the patents CN 1753355A, US2004105687, EP1675282, and WO03013030A2 is: real-time acquisition of 0 error code and 1 error code value, determining the difference between the 0 error code and the 1 error code and the predetermined value. If the difference is less than the predetermined value, the decision level does not need to be adjusted; if the difference is not less than the predetermined value, the direction and step size of the decision level adjustment are determined according to the difference value, and the decision level is quickly adjusted in real time.
  • the optical signal-to-noise ratio of the optical receiver entering the optical receiver is relatively high.
  • the 0 error code and the 1 error code corresponding to all the decision level values in a certain range.
  • the difference is less than a predetermined value, for example, the decision level is in the range of 30% to 50%, and the difference between the 0 bit error and the 1 bit error is less than the predetermined value.
  • the above method is used to adjust The decision level is the initial value of the decision level; when the initial value of the decision level is less than the range, the decision level adjusted by the above method is the minimum value of the range of 30%; when the initial value of the decision level is greater than the range, the application
  • the decision level obtained by the above method adjustment is the maximum value of this range of 50%.
  • the difference between the decision level and the 0 error code and the 1 error code is not the only corresponding relationship, and the optimized decision level is obviously not the optimal value.
  • the main factors affecting the decision level of the optical receiver include optical transmitter parameters, received optical power, optical signal to noise ratio, residual dispersion, and the like.
  • the effect of these factors on the 0 bit error and the 1 bit error value is complex.
  • applying the above method to adjust the decision level in real time may cause large-scale adjustment and oscillation of the decision level, resulting in deterioration of signal performance. In severe cases, normal communication may be affected. .
  • the above method for adjusting the decision level in real time during the operation of the optical receiver has the risk of affecting the stability and reliability of the system. Therefore, large-scale adjustment of the decision level of the optical receiver carrying the service should be avoided.
  • the large-scale optimization adjustment of the decision level should be performed before the optical receiver leaves the factory and before the service is opened. After the optical receiver carries the service, the decision level should be fixed or the decision level should be optimized within a specified small range.
  • the invention provides a method and a device for optimizing the decision level of an optical receiver, which solves the problem that the stability and reliability of the system are affected by the manner in which the prior art adjusts the decision level in real time during the operation of the optical communication system. .
  • a method of optimizing a decision level of an optical receiver comprising the steps of:
  • the error rate before the forward error correction is the sum of the number of 0 errors before the forward error correction and the number of 1 error codes per unit time.
  • the step A further comprises determining that the system parameters of the optical receiver are within an appropriate range and remain unchanged.
  • the system parameters of the optical receiver include received optical power, optical signal to noise ratio, and residual dispersion parameters.
  • the minimum value is found in the detected error rate before the forward error correction by using the sequential search mode or the segment search mode.
  • the intermediate value is taken as the optimal decision level value.
  • a device for optimizing a decision level of an optical receiver comprising: a decision level adjusting unit, a forward error correction rate error detecting unit, a decision level control unit, and an optimal decision level determining unit, wherein the determining power
  • the level adjustment unit is configured to adjust the decision level value within the determination level adjustment range according to the adjustment instruction of the decision level control unit;
  • the forward error correction error rate detecting unit is configured to detect a forward error correction error rate corresponding to different decision level values, and transmit the same to the decision level control unit;
  • the decision level control unit is configured to send a decision level adjustment instruction to the decision level adjustment unit, and receive a forward error correction error rate sent by the forward error correction error rate detection unit, and Transmitting the forward error correction error rate and the corresponding decision level value to the optimal decision level determining unit;
  • the optimal decision level determining unit is configured to receive a forward error correction error rate and a corresponding decision level value sent by the decision level control unit before all detected forward error correction Find the minimum value in the bit error rate, and the corresponding decision level value is the optimal decision level value.
  • the error rate before the forward error correction is the sum of the number of 0 errors before the forward error correction and the number of 1 error codes per unit time.
  • the step size adjustment range and the step size of the decision level adjustment are first determined, and then the bit error rate before the error correction is based on the light.
  • the decision level of the receiver is optimally adjusted to obtain an optimal decision level value corresponding to the minimum error rate before forward error correction, and the optimal decision level value is a global optimal decision level value within the determined range, and Not a local optimal decision level value.
  • the invention is simple to implement, and avoids the oscillation phenomenon caused by the frequent and large-scale adjustment of the decision level of the optical receiver in the bearer service working condition.
  • FIG. 1 is a flow chart showing an implementation principle of a method for optimizing a decision level of an optical receiver according to the present invention
  • FIG. 2 is a schematic structural diagram of an apparatus for optimizing a decision level of an optical receiver according to the present invention
  • Figure 4 is a block diagram showing the structure of a preferred embodiment of the apparatus for optimizing the decision level of an optical receiver according to the present invention.
  • FIG. 1 is a flowchart of an implementation of a method for optimizing a decision level of an optical receiver according to the present invention, which mainly includes the following steps:
  • Step 10 determining a maximum value and a minimum value of the determination level adjustment range, and determining a step size of the determination level adjustment;
  • This step also includes determining that the system parameters of the optical receiver are within an appropriate range and remain unchanged.
  • the system parameters of the optical receiver include received optical power, optical signal to noise ratio, and residual dispersion parameters.
  • Step 11 Adjust the decision level value within the range of the decision level adjustment, and respectively detect the error rate before the forward error correction corresponding to the different decision level values, and the error rate before the forward error correction is forward in the unit time. The sum of the number of 0 errors before the error correction and the number of 1 errors.
  • Step 12 Find a minimum value in the detected error rate before the forward error correction, and the corresponding determination power
  • the flat value is the best decision level value
  • the minimum value can be found in the detected error rate before the forward error correction by using the sequential search mode or the segment search mode, and the minimum value of the detected forward error correction code rate corresponds to the determination power. If the value is a flat value, the intermediate value is taken as the optimum decision level value.
  • the present invention further provides an apparatus for optimizing the decision level of an optical receiver.
  • FIG. 2 the figure is a structural schematic diagram of an apparatus for optimizing a decision level of an optical receiver according to the present invention.
  • the method mainly includes a decision level adjusting unit, a forward error correction rate error detecting unit, a decision level control unit, and an optimal decision level determining unit, where
  • the decision level adjusting unit is configured to adjust the current decision level value within the decision level adjustment range according to the instruction of the decision level control unit;
  • the error rate before the error correction is the sum of the number of 0 errors before the forward error correction and the number of 1 error codes per unit time, and the detected forward error correction code rate Transmitted to the decision level control unit;
  • the decision level control unit is configured to send a decision level adjustment instruction to the decision level adjustment unit, and receive the forward error correction error rate sent by the error correction rate detecting unit before the forward error correction And transmitting data of the error correction rate and the decision level value before the forward error correction to the optimal decision level determining unit;
  • the optimal decision level determining unit is configured to receive the forward error correction sent by the decision level control unit The data of the pre-error rate and the decision level value find a minimum value among all detected error rates before the forward error correction, and the corresponding decision level value is the optimal decision level value.
  • a flow chart of a preferred embodiment of a method for optimizing a decision level of an optical receiver according to the present invention includes the following steps:
  • Step 20 determining parameters such as received optical power, optical signal-to-noise ratio, and residual dispersion of the optical receiver are suitable within the range, the minimum and maximum values of the decision level adjustment range are determined, and the step size of the decision level adjustment is determined. For example, it is determined that the minimum value of the decision level is 20%, and the maximum value of the decision level is 70%.
  • the minimum step size for decision level adjustment is determined by the accuracy of the digital potentiometer that adjusts the decision level. When using an 8-bit digital potentiometer, the minimum step size is approximately 0.4%.
  • Step 21 Initialize the current decision level value to the decision level minimum value.
  • Step 22 Adjust the decision level to the current decision level value.
  • Step 23 Determine whether the optical receiver is in a normal working state. If yes, go to step 24, otherwise, go to step 26.; when the optical receiver is in normal working state, there is no signal loss alarm and frame loss alarm, and before forward error correction the bit error rate is less than 10-4.
  • Step 24 Detect the current error rate before forward error correction.
  • Step 25 Record the current error rate before forward error correction and its corresponding decision level value.
  • Step 26 Increase the current decision level value by a preset step size.
  • Step 27 Determine whether the current decision level value is greater than the maximum value of the decision level. If yes, go to step 28, otherwise, go back to step 22.
  • Step 28 Search for a minimum bit error rate in the recorded error rate before the forward error correction, and the corresponding decision level value is the optimal decision level value.
  • the decision level value corresponding to the minimum bit error rate is not a value but a set of values, the value in the middle of the set of values is taken as the optimum decision level value.
  • Step 29 Adjust the decision level to the minimum optimal decision level corresponding to the error rate before the forward error correction, and the optimization is completed.
  • FIG. 4 is a structural block diagram of a preferred embodiment of an apparatus for optimizing a decision level of an optical receiver according to the present invention, which mainly includes a decision level adjustment unit, a data clock recovery unit, and a forward error correction. a bit error rate detecting unit, a decision level control unit, and an optimal decision level determining unit, wherein
  • the decision level adjusting unit is configured to adjust a decision level value of the electrical signal outputted by the photoelectric conversion and the amplifying unit in the optical receiver according to the adjustment instruction of the decision level control unit;
  • the data clock recovery unit is configured to separate the electrical signal stream output by the decision level adjusting unit into a data signal and a clock signal, and perform serial-to-parallel conversion on the data signal into the forward error correction pre-error rate detecting unit.
  • the forward error correction rate error detecting unit is configured to detect a forward error correction error rate corresponding to a decision level value of the data signal input by the data clock recovery unit, and transmit the error correction rate to the decision level control unit.
  • the decision level control unit is configured to send a decision level adjustment instruction to the decision level adjustment unit, and receive the forward error correction error rate sent by the error correction rate detecting unit before the forward error correction, and before the forward error correction
  • the data of the bit error rate and the decision level value is transmitted to the optimal decision level determining unit; the first issued decision level adjusting command specifies the decision level as the minimum value of the decision level range value, and then forward error correction
  • the adjustment level is incremented by a preset step in each adjustment command issued by the pre-error rate detection unit until it reaches the maximum value in the decision level range value.
  • a bit error rate before forward error correction is received.
  • the optimal decision level determining unit is configured to receive data of the forward error correction error rate and the decision level value sent by the decision level control unit, and find the minimum among all detected forward error correction error rates.
  • the value, the corresponding decision level value is the optimal decision level value.
  • the step size adjustment range and the step size of the decision level adjustment are first determined, and then the error rate before the error correction is based on the decision of the optical receiver.
  • the level is optimized and adjusted, and the optimal decision level corresponding to the minimum error rate before forward error correction is obtained.
  • the optimal decision level value is the global optimal decision level value within the determined range, rather than the local optimum. Decision level value.

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Description

一种优化光接收机判决电平的方法及装置 技术领域
本发明涉及光通信技术领域， 具体涉及一种优化光接收机判决电平的方 法及装置
背景技术
光通信系统中， 发送端的光发射机将 0和 1数字电信号转换为光信号在 光纤里传输， 在接收端光接收机经过光电转换， 还原 0和 1数字电信号。 理 想情况下， 光接收机的判决电平处于平均值， 即 50%处， 可以准确判决 0和 1 信号。 但由于长距离传输过程中噪声、 光纤非线性效应等因素的影响， 导 致信号 1和信号 0发生畸变， 因此需要调整光接收机的判决电平来准确判决 0和 1信号。
目前光通信系统中主要釆用 FEC ( Forward Error Correction, 前向纠错） 的编解码方法对 0和 1误码进行检错和纠错。 优化光接收机判决电平可以有 效减少前向纠错前 0和 1误码的个数， 即前向纠错前的误码数。 当前向纠错 前的误码率最小时， 前向纠错后的误码率也为最小， 即系统的误码率最小。 因此可以用前向纠错前的误码率来作为光接收机判决电平优化的依据。
专利 CN 1753355A, US2004105687 , EP1675282, WO03013030A2公开 的光接收机判决电平优化方法为： 实时获取 0误码和 1误码的数值， 判断 0 误码和 1误码的差值与预定值的大小。 如果差值小于预定值， 判决电平不需 调整； 如果差值不小于预定值， 则才艮据差值决定判决电平调整的方向和步长， 并对判决电平进行实时快速调整。
在正常工作情况下的光通信系统中， 进入光接收机的光信噪比是比较高 的， 在此情况下， 一定范围内全部的判决电平值所对应的 0误码和 1误码的 差值都小于预定值， 例如判决电平在 30%至 50%范围内， 0误码和 1误码的 差值都小于预定值。 当判决电平初始值在此范围内， 应用上述方法调整得到 的判决电平就是判决电平初始值； 当判决电平初始值小于此范围， 应用上述 方法调整得到的判决电平就是此范围的最小值 30%; 当判决电平初始值大于 此范围， 应用上述方法调整得到的判决电平就是此范围的最大值 50%。 由此 决电平与 0误码和 1误码的差值不是唯一对应的关系， 优化后的判决电平显 然不是最优值。
在光通信系统中，影响光接收机判决电平的主要因素包括光发射机参数、 接收光功率、 光信噪比、 残余色散等。 这些因素对 0误码和 1误码数值的影 响是复杂的。 当系统受外界影响， 某些因素发生突然改变时， 应用上述方法 实时调整判决电平可能会造成判决电平的大范围调整和震荡， 从而导致信号 性能劣化， 严重时可能会影响业务的正常通信。
由此可见， 上述在光接收机运行过程中大范围实时调整判决电平的方法 存在着影响系统稳定性和可靠性的风险。 因此， 应避免对承载业务的光接收 机进行判决电平的大范围调整。 对判决电平的大范围优化调整应当在光接收 机出厂前和业务开通前进行， 光接收机承载业务后应当保持判决电平固定不 变或者在指定的小范围内优化判决电平。
发明内容
本发明提供一种优化光接收机判决电平的方法及装置， 用以解决现有技 术在光通信系统运行过程中大范围实时调整判决电平的方式存在着影响系统 稳定性和可靠性的问题。
本发明技术方案如下：
一种优化光接收机判决电平的方法， 其包括以下步骤：
A、 确定判决电平调整范围的最大值及最小值， 以及确定判决电平调整 的步长；
B、在判决电平调整范围内调整判决电平值，分别检测不同判决电平值对 应的前向纠错前误码率；
C、在检测到的前向纠错前误码率中查找最小值，其对应的判决电平值即 为最佳判决电平值。
较佳地， 所述前向纠错前误码率为单位时间内前向纠错前的 0误码个数 和 1误码个数之和。
较佳地， 所述步骤 A前还包括确定所述光接收机的系统参数处于适当范 围之内且保持不变。
较佳地， 所述光接收机的系统参数包括接收光功率、 光信噪比及残余色 散参数。
较佳地， 所述步骤 C中， 釆用顺序查找方式或分段查找方式在检测到的 前向纠错前误码率中查找最小值。
较佳地， 所述步骤 C中， 当检测到的前向纠错前误码率中的最小值对应 的判决电平值为若干个， 则取其中的中间值作为最佳判决电平值。
一种优化光接收机判决电平的装置， 包括判决电平调整单元、 前向纠错 前误码率检测单元、 判决电平控制单元及最佳判决电平确定单元， 其中， 所述判决电平调整单元设置为按照所述判决电平控制单元的调整指令在 判决电平调整范围内调整判决电平值；
所述前向纠错前误码率检测单元设置为检测不同判决电平值对应的前向 纠错前误码率， 将其传送给所述判决电平控制单元；
所述判决电平控制单元设置为向所述判决电平调整单元发送判决电平调 整指令， 接收所述前向糾错前误码率检测单元送来的前向糾错前误码率， 并 将所述前向纠错前误码率和对应的判决电平值传送给所述最佳判决电平确定 单元；
所述最佳判决电平确定单元设置为接收所述判决电平控制单元送来的前 向纠错前误码率和所述对应的判决电平值， 在所有检测到的前向纠错前误码 率中查找最小值， 其对应的判决电平值即为最佳判决电平值。
较佳地， 所述前向糾错前误码率为单位时间内前向糾错前的 0误码个数 和 1误码个数之和。
应用本发明所述技术方案， 在设备出厂前和业务开通前， 首先确定判决 电平调整范围和判决电平调整的步长， 然后以前向纠错前误码率为依据对光 接收机的判决电平进行优化调整， 得到前向纠错前最小误码率对应的最优判 决电平值， 此最优判决电平值是确定范围内的全局最优判决电平值， 而不是 局部最优判决电平值。
应用本发明所述技术方案， 在业务开通后， 首先缩小判决电平调整范围 和减小判决电平调整的步长， 以前向纠错前误码率为依据对光接收机的判决 电平进行优化调整， 得到缩小判决电平调整范围后的最优判决电平值。
与现有技术相比， 本发明实现简单， 避免了光接收机在承载业务工作情 况下频繁大范围调整判决电平所引起的震荡现象。
附图概述
图 1为本发明所述优化光接收机判决电平的方法的实现原理流程图； 图 2为本发明所述优化光接收机判决电平的装置的结构原理图； 图 3为本发明所述优化光接收机判决电平的方法的一个较佳实施例的流 程图；
图 4为本发明所述优化光接收机判决电平的装置的一个较佳实施例的结 构框图。
本发明的较佳实施方式
请参阅图 1 , 该图为本发明所述优化光接收机判决电平的方法的实现原 理流程图， 其主要包括步骤：
步骤 10、 确定判决电平调整范围的最大值及最小值， 以及确定判决电平 调整的步长；
本步骤前还包括确定所述光接收机的系统参数处于适当范围之内且保持 不变。 所述光接收机的系统参数包括接收光功率、 光信噪比及残余色散参数。
步骤 11、 在判决电平调整范围内调整判决电平值， 分别检测不同判决电 平值对应的前向纠错前误码率， 所述前向纠错前误码率为单位时间内前向纠 错前的 0误码个数和 1误码个数之和。
步骤 12、 在检测到的前向纠错前误码率中查找最小值， 其对应的判决电 平值即为最佳判决电平值；
本步骤中， 可釆用顺序查找方式或分段查找方式在检测到的前向纠错前 误码率中查找最小值， 当检测到的前向纠错误码率中的最小值对应的判决电 平值为若干个， 则取其中的中间值作为最佳判决电平值。
不同的接收光功率、 光信噪比、 残余色散等系统参数对应不同的最佳判 决电平。 因此在应用上述方法进行优化光接收机判决电平时， 系统参数应保 持不变。 当接收光功率、 光信噪比、 残余色散等参数发生变化， 原有判决电 平值已经不是最优判决电平值时， 再次应用一次本发明的方法， 即可得到新 的最优判决电平值。
相应于本发明上述方法， 本发明进而提出了一种优化光接收机判决电平 的装置， 请参阅图 2 , 该图为本发明所述优化光接收机判决电平的装置的结 构原理图， 其主要包括判决电平调整单元、 前向纠错前误码率检测单元、 判 决电平控制单元及最佳判决电平确定单元， 其中，
判决电平调整单元用于根据判决电平控制单元的指令在判决电平调整范 围内调整当前判决电平值；
错前误码率， 所述前向糾错前误码率为单位时间内前向糾错前的 0误码个数 和 1误码个数之和， 将检测到的前向纠错误码率传送给判决电平控制单元； 判决电平控制单元用于向判决电平调整单元发送判决电平调整指令， 接 收前向糾错前误码率检测单元送来的前向糾错前误码率， 并将前向糾错前误 码率与判决电平值的数据传送给最佳判决电平确定单元； 最佳判决电平确定单元用于接收判决电平控制单元送来的前向纠错前误 码率与判决电平值的数据，在所有检测到的前向纠错前误码率中查找最小值， 其对应的判决电平值即为最佳判决电平值。
下面将通过具体实施例对本发明的具体实现予以进一步详细的说明。 请参阅图 3 , 该图为本发明所述优化光接收机判决电平的方法的一个较 佳实施例的流程图， 其主要包括步骤：
步骤 20、 确定光接收机的接收光功率、 光信噪比、 残余色散等参数在适 当范围之内， 确定判决电平调整范围的最小值和最大值， 确定判决电平调整 的步长。 例如确定判决电平最小值为 20%, 判决电平最大值为 70%。 判决电 平调整的最小步长由调整判决电平的数字电位器的精度决定， 当使用 8位数 字电位器时， 最小步长约为 0.4%。一般情况下， 步长预设为最小步长乘以 N, 其中 N=l , 2, 3 , ... ...。 N越小， 优化判决电平的时间越长； N越大， 优化 判决电平的时间越短。
步骤 21、 将当前判决电平值初始化为判决电平最小值。
步骤 22、 将判决电平调整为当前判决电平值。
步骤 23、 判断光接收机是否处于正常工作状态， 如果是， 执行步骤 24, 否则， 转步骤 26; 光接收机处于正常工作状态是指没有信号丟失告警及帧丟 失告警， 且前向纠错前误码率小于 10-4。
步骤 24、 检测当前的前向纠错前误码率。
步骤 25、 记录当前的前向纠错前误码率及其对应的判决电平值。
步骤 26、 将当前判决电平值增加预设的步长。
步骤 27、 判断当前判决电平值是否大于判决电平最大值， 如果是， 执行 步骤 28, 否则， 返回步骤 22。
步骤 28、 在记录的前向纠错前误码率中搜索最小误码率， 其对应的判决 电平值即为最佳判决电平值。 当最小误码率对应的判决电平值不是一个值而 是一组值时， 取这组值中间的值作为最佳判决电平值。
步骤 29、 将判决电平调整为最小的前向纠错前误码率对应的最优判决电 平值， 优化完成。
请参阅图 4 , 该图为本发明所述优化光接收机判决电平的装置的一个较 佳实施例的结构框图， 其主要包括判决电平调整单元、 数据时钟恢复单元、 前向纠错前误码率检测单元、 判决电平控制单元及最佳判决电平确定单元， 其中，
判决电平调整单元用于按照判决电平控制单元的调整指令， 在判决电平 调整范围内调整光接收机中光电转换及放大单元输出的电信号的判决电平 值； 数据时钟恢复单元用于将判决电平调整单元输出的电信号流分离为数据 信号和时钟信号， 并对数据信号进行串并变换输入前向纠错前误码率检测单 元中。
前向纠错前误码率检测单元用于检测数据时钟恢复单元输入的数据信号 的判决电平值对应的前向纠错前误码率， 将其传送给判决电平控制单元。
判决电平控制单元用于向判决电平调整单元发送判决电平调整指令， 接 收前向糾错前误码率检测单元送来的前向糾错前误码率， 并将前向糾错前误 码率与判决电平值的数据传送给最佳判决电平确定单元； 首次发出的判决电 平调整指令将判决电平指定为判决电平范围值中的最小值， 以后在前向纠错 前误码率检测单元的触发下每次发出的调整指令中将判决电平增加预设步 长， 直到其达到判决电平范围值中的最大值。每发送一个判决电平调整指令， 对应接收一个前向糾错前误码率。
最佳判决电平确定单元用于接收判决电平控制单元送来的前向纠错前误 码率与判决电平值的数据，在所有检测到的前向纠错前误码率中查找最小值， 其对应的判决电平值即为最佳判决电平值。
发明的精神和范围。 这样， 倘若本发明的这些修改和变型属于本发明权利要 求及其等同技术的范围之内， 则本发明也意图包含这些改动和变型在内。
工业实用性
应用本发明所述技术方案， 在设备出厂前和业务开通前， 首先确定判决 电平调整范围和判决电平调整的步长， 然后以前向纠错前误码率为依据对光 接收机的判决电平进行优化调整， 得到前向纠错前最小误码率对应的最优判 决电平值， 此最优判决电平值是确定范围内的全局最优判决电平值， 而不是 局部最优判决电平值。
应用本发明所述技术方案， 在业务开通后， 首先缩小判决电平调整范围 和减小判决电平调整的步长， 以前向纠错前误码率为依据对光接收机的判决 电平进行优化调整， 得到缩小判决电平调整范围后的最优判决电平值。 与现有技术相比， 本发明实现简单， 避免了光接收机在承载业务工作情 况下频繁大范围调整判决电平所引起的震荡现象。

Claims

权 利 要 求 书
1、 一种优化光接收机判决电平的方法， 其包括步骤：
A、 确定判决电平调整范围的最大值及最小值， 以及确定判决电平调整 的步长；
B、在判决电平调整范围内调整判决电平值，分别检测不同判决电平值对 应的前向纠错前误码率； 以及
C、在检测到的前向纠错前误码率中查找最小值，其对应的判决电平值即 为最佳判决电平值。
2、 如权利要求 1所述的方法， 其中， 所述前向纠错前误码率为单位时间 内前向糾错前的 0误码个数和 1误码个数之和。
3、 如权利要求 1所述的方法， 所述步骤 A前还包括以下步骤： 确定所述光接收机的系统参数处于正常范围之内且保持不变。
4、 如权利要求 3所述的方法， 其中， 所述光接收机的系统参数包括接收 光功率、 光信噪比及残余色散参数。
5、 如权利要求 1所述的方法， 其中， 所述步骤 C中， 釆用顺序查找方式 或分段查找方式在检测到的前向纠错前误码率中查找最小值。
6、 如权利要求 1所述的方法， 其中， 所述步骤 C中， 当检测到的前向纠 错前误码率中的最小值对应的判决电平值为若干个， 则取其中的中间值作为 最佳判决电平值。
7、 一种优化光接收机判决电平的装置， 其包括判决电平调整单元、 前向 纠错前误码率检测单元、 判决电平控制单元及最佳判决电平确定单元， 其中， 所述判决电平调整单元设置为按照所述判决电平控制单元的调整指令在 判决电平调整范围内调整判决电平值；
所述前向纠错前误码率检测单元设置为分别检测不同判决电平值对应的 前向糾错前误码率， 并将其传送给所述判决电平控制单元；
所述判决电平控制单元设置为向所述判决电平调整单元发送判决电平调 整指令， 接收所述前向糾错前误码率检测单元送来的前向糾错前误码率， 并 将所述前向纠错前误码率及其对应的判决电平值传送给所述最佳判决电平确 定单元；
所述最佳判决电平确定单元设置为接收所述判决电平控制单元送来的所 述前向纠错前误码率及其对应的判决电平值， 在所有检测到的所述前向纠错 前误码率中查找最小值， 所述最小值所对应的判决电平值即为最佳判决电平 值。
8、 如权利要求 7所述的装置， 其中， 所述前向纠错前误码率为单位时间 内前向糾错前的 0误码个数和 1误码个数之和。
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