| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide optical phase control technique for an optical receiver capable of searching for a signal communication point in a shorter time than heretofore. <P>SOLUTION: The optical receiver includes: delay interferometers 51a and 51b respectively provided in two branches that branch a reception signal; phase shift amount control means 51c and 51d that control the phase shift amount of the delay interferometers in accordance with an optical phase control value; a balanced optical detecting section 52 that respectively photoelectrically converts respective branch signals output from the delay interferometers; a data regenerating section 53 that regenerates transmission data from the photoelectrically converted branch signals output from the balanced optical detecting section; a control section 60 that outputs the optical phase control value based on a signal of the data regenerating section; and a memory 61 that stores a control value history storing the optical phase control value output from the control section at the time of signal communication. The control section refers to the control value history in the memory 61 when performing a signal communication operation to determine the optical phase control value. <P>COPYRIGHT: (C)2010,JPO&INPIT |
