Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1994-04-04
1995-03-21
Goldstein, Herbert
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359191, H04B 900, H04B 1006, H04J 1400
Patent
active
054001676
ABSTRACT:
An automatic frequency control system, for an optical coherent communication system, in which the frequency of local oscillation light 5 from a coherent light communication receiver 100 is swept to pull the intermediate frequency to a stable AFC point. The AFC is caused to operate with an intermediate frequency in the AFC operation range, and interrupted. Subsequently while sweeping the frequency of local oscillation light 5 in a certain direction in a predetermined range, the output voltage of frequency discriminator 9 is monitored. Once the change of the output voltage of frequency discriminator 9 due to the sweep exceeds the predetermined threshold value, the AFC resumes for pulling to a stable point.
REFERENCES:
patent: 4903342 (1990-02-01), Yamazaki
patent: 4912527 (1990-03-01), Yamazaki
patent: 5046140 (1991-09-01), Yamazaki
Goldstein Herbert
Mehta Bhavesh
NEC Corporation
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