| 摘要 |
An optical receiver for receiving a transmission light signal which is subjected to an optical phase modulation based on a data signal to be transmitted and has a dither signal superposed thereon includes a delay interferometer to which the transmission light signal having the dither signal superposed thereon is applied and which converts the transmission light signal into a light intensity modulation signal based on a control signal, a photodetector for converting two light outputs of the delay interferometer into an electric signal, two current detecting sections for differentially detecting a photocurrent flowing to the photodetector as a detection voltage, a data clock reproducing section for outputting the data signal and a clock signal based on an output of the photodetector, two filter sections for extracting dither signal components of the differential detection voltages respectively, and a control section for determining the control signal and applying the control signal to the delay interferometer in such a manner that one of the differential detection voltages is a maximum and the other is a minimum, and both of the dither signal components which are extracted have a minimum amplitude.
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