Apparatus and method for selfadapting dispersion compensation

摘要

The present invention discloses an apparatus and method for adaptive dispersion compensation, the apparatus comprising: a coarse-grain tunable dispersion compensator, a receiver with electric adaptive dispersion compensator, and a control logic unit. In the method, firstly it is to perform optical dispersion compensation for the input optical signals; then to perform electric dispersion compensation for the optical signals for which the optical dispersion compensation is performed; it is to detect the performance parameters of the receiving of the optical signals for which the electric dispersion compensation has been performed, and based on the performance parameters, it is to perform optical dispersion compensation adjustment for said input optical signals. With an optical de-multiplexer further, said apparatus can perform adaptive dispersion compensation for the multi-channel system. By using the apparatus and method for adaptive dispersion compensation of the present invention, it significantly reduces the number of adjustments as well as decreases the dispersion compensation time and can fast and accurately realize a wide range of adaptive dispersion compensation for either single channel or multi-channel.

主权项

1. An apparatus for adaptive dispersion compensation which is used for adaptive dispersion compensation in an optical communication system, comprising a receiver with an electric adaptive dispersion compensator, a control logic unit and a coarse-grain tunable dispersion compensator, wherein,
the receiver with the electric adaptive dispersion compensator is configured to perform electric dispersion compensation for each single-channel electric signal obtained by photoelectric conversion and linear amplification of input optical signals; the control logic unit is configured to determine whether a performance parameter value of the receiver, after the electric dispersion compensation has been performed, is deteriorated to the extent that optical dispersion compensation tuning is needed, and if the performance parameter value is deteriorated to the extent that the optical dispersion compensation tuning is needed, control the coarse-grain tunable dispersion compensator through feedback based on said performance parameter value to perform optical dispersion compensation adjustment for the input optical signals; and the coarse-grain tunable dispersion compensator is configured to perform optical dispersion compensation for the input optical signals based on the feedback controls of the control logic unit and to send to the receiver the input optical signals for which the optical dispersion compensation has been performed; wherein the control logic unit is further configured to perform the following steps for multi-channel optical signals:
adjusting the optical dispersion compensation a plurality of times and recording a value of the optical dispersion compensation used in each adjustment as well as corresponding performance parameter values of the receiver after optical dispersion compensation and electric dispersion compensation have been performed;based on the performance parameter value of the receiver after each adjustment, determining a preferred optical dispersion compensation value of each single-channel optical signal, and from these preferred optical dispersion compensation values, determining a preferred optical dispersion compensation value of the entire system, and using the preferred optical dispersion compensation value of the entire system to perform the optical dispersion compensation for said input optical signals;the step of determining the preferred optical dispersion compensation value of each of the single-channel optical signals comprises:
selecting an optimal performance parameter of each of the single-channel optical signals from the performance parameters of the receiver after each adjustment, anddetermining the corresponding preferred optical dispersion compensation value based on the selected optimal performance parameter of the single-channel optical signals;the step of determining preferred optical dispersion compensation value of the entire system comprises:
selecting an optimal performance parameter of the entire system from the preferred performance parameters of each of the single-channel optical signals, anddetermining the corresponding preferred optical dispersion compensation value of the entire system based on the selected optimal performance parameter of the entire system.