Patent ID: 6118564
Filing Date: 2000-09-12
Classification: H04J,H04Q

Abstract:
An optical time division demultiplexing apparatus, comprising:a clock signal generation element for generating a clock signal for optical time division demultiplexing processing of a received optical signal which has been transmitted at a predetermined first bit rate;an optical switch for time division demultiplexing the received first bit rate optical signal into a second bit-rate optical signal having a half speed of said first bit rate based on said clock signal, whose frequency is half the frequency of said first bit rate, from said clock signal generation element; andan operating point stabilization control circuit for superposing a predetermined low frequency signal on said clock signal to be supplied to said optical switch for optical time division demultiplexing processing and controlling said clock signal which is to be supplied to said optical switch, based on a phase difference between a component of said predetermined low frequency signal of the demultiplexed optical signal as the result of time division demultiplexing processing by said optical switch and a component of said predetermined low frequency signal so that the individual optical switch runs with a stable operation characteristic in such a manner that its operating point normally tends to assume a target position.