| 摘要 |
PROBLEM TO BE SOLVED: To produce an error signal for spatial beam adjustment of an optical superimposing receiver by minimizing simultaneous missing of data signals to be sent with an excellent S/N while avoiding a system loss to the utmost. SOLUTION: In the case of controlling optical alignment of two optical waves in the coherent superimposition mode, after a light of a local laser 5 is superimposed on a received light 1, the obtained signal is split into two partial beams 1A, 1B at a beam splitter 2. Then detectors 3, 4 generate error signals 3, 4 from the two split beams and the two error signals are used for spatial error signals to conduct spatial beam adjustment. An original data signal 15 is obtained again by summing respective correct codes of the error signals. |
