Patent ID: 8306426
Filing Date: 2012-11-06
Classification: H04J

Abstract:
1. An Optical Code Division Multiplexing (OCDM) communication system comprising: a plurality of encoders provided respectively for a plurality of communication channels, each of the encoders including a superstructured fiber Bragg grating, in which a plurality of unit fiber Bragg gratings is arranged, and encoding an optical signal using a code value determined according to a distance between adjacent ones of the unit fiber Bragg gratings; a plurality of decoders provided respectively for the plurality of communication channels, each of the decoders including a superstructured fiber Bragg grating, in which a plurality of unit fiber Bragg gratings is arranged, and generating a received optical signal by decoding an optical signal encoded by a corresponding encoder using a code value determined according to a distance between adjacent ones of the unit fiber Bragg gratings; a temperature changing part that individually changes a temperature of each of the encoders and the decoders based on a control signal; a transmission path provided for multiplexed transmission of optical signals between the encoders and the decoders; a power monitoring part that generates a first detection signal indicating whether or not an average power of each received optical signal has changed in each unit time; an error monitoring part that generates a second detection signal according to an error rate of each received optical signal; and a set temperature calculating part that calculates a set temperature of the encoder or decoder based on the first and second detection signals and provides the calculated set temperature as the control signal to the temperature changing part, wherein the set temperature calculating part calculates the set temperature of the encoder or the decoder so that respective code values of an encoder and a decoder belonging to a communication channel in which an average power of a received optical signal has changed or a communication channel in which an error rate of a received optical signal is higher than a predetermined value are equal.