| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical receiver which can stably receive a transmission light signal without modulating a control signal of a delay interferometer, and to provide an optical transmitter. <P>SOLUTION: The 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 means for differentially detecting a photocurrent flowing to the photodetector as a detection voltage; a data clock reproducing means for outputting the data signal and a clock signal based on an output of the photodetector; two filter means for extracting dither signal components of the differential detection voltages respectively; and a control means 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. <P>COPYRIGHT: (C)2008,JPO&INPIT |
