| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce fluctuations in time and intensity for autocorrelation signal after time gate processing has been confirmed conventionally, by performing the time gate processing with a clock signal whose time jitters are suppressed. <P>SOLUTION: In a decoder 145, a received optical code division multiplex signal is branched into two. One is reflected as a decoded signal, and the other is transmitted as a coded signal in a coded state. In a clock extraction circuit 161, the coded signal is branched into the two of a first coded signal and a second coded signal. In a first clock signal generator 170, a first clock signal is generated from the first coded signal. Moreover, in a second clock signal generator 180, optical pulses synchronized with the first clock signal are extracted from the second coded signal, and a second clock signal is generated from the extracted optical pulses. In a time gate processor 150 by using the second clock signal as a gate signal, time gate processing is performed, with respect to the decoded signal, and its output is performed. <P>COPYRIGHT: (C)2007,JPO&INPIT |
