| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain an optical receiver capable of optimally controlling MZI (Mach Zehnder interferometer) passing waves without deteriorating receiving characteristics and without using a high-speed electrical circuit. <P>SOLUTION: The optical receiver for receiving an optical DPSK (differential phase shift key) signal that is differentially encoded by a one-bit delay amount is provided with an optical branching circuit 10 for branching the received optical DPSK signal, a Mach Zehnder interferometer 20 in which a relative delay amount between arms is 1/2 bit and which converts the optical DPSK signal branched by the optical branching circuit 10 into an intensity modulation signal, an optical branching circuit 40 for respectively returning two optical outputs of the Mach Zehnder interferometer 20 and respectively branching a portion of the two optical outputs, a wavelength deviation detection circuit 50 for detecting an output difference between optical power of the two optical outputs branched by the optical branching circuit 40, and a control circuit 60 for controlling the passing wavelength of the Mach Zehnder interferometer 20 on the basis of the output difference between the two optical power detected by the wavelength deviation detection circuit 50. <P>COPYRIGHT: (C)2007,JPO&INPIT |
