Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1989-02-14
1990-10-23
Orsino, Joseph A.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
H04B 1006
Patent
active
049658581
ABSTRACT:
A polarized wave diversity optical receiver for coherent optical communication including: an optical local oscillating circuit (7) for oscillating local oscillating light; a mixing circuit (8) for mixing signal light and the local oscillating light to obtain two polarized components; a detecting circuit (9) for detecting the polarized component to output intermediate frequency signals (e.sub.S and e.sub.P); and a frequency control circuit (11) for controlling, in accordance with the intermediate frequency signals (e.sub.S and e.sub.P), the oscillating frequency of the optical local oscillating circuit (7). To ensure that the intermediate frequency does not disappear, the frequency control circuit (11) outputs a combined signal of a sum and a difference of the intermediate frequency signals (e.sub.S and e.sub.P).
REFERENCES:
patent: 4732447 (1988-03-01), Wright
patent: 4912527 (1990-03-01), Yamazaki
Chikama Terumi
Kiyonaga Tetsuya
Kuwahara Hideo
Miyata Hideyuki
Naito Takao
Beek L. Van
Fujitsu Limited
Orsino Joseph A.
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