Optical receiving method utilizing polarization diversity and ap

Details Optical receiving method utilizing polarization diversity and ap Optical receiving method utilizing polarization diversity and ap

1988-03-11

1992-08-18

Coles, Sr., Edward L.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

H04B 1006

Patent

active

051404532

ABSTRACT:
An optical receiving method utilizing polarization diversity is disclosed in which first and second reference lightwaves having different frequencies and having polarization planes substantially perpendicular to each other, are combined with a signal lightwave to form a combined lightwave. The combined lightwave is subjected to heterodyne detection to obtain a detection signal and the detection signal is separated into first and second intermediate-frequency signals having different carrier frequencies. The first and second intermediate-frequency signals are converted into first and second baseband signals, respectively, and the first and second baseband signals are added to obtain an output signal.

REFERENCES:
patent: 4506388 (1985-03-01), Monerie
patent: 4718120 (1988-01-01), Tzeng
patent: 4723316 (1988-02-01), Glance
Fourth International Conference on Optical Fiber Communication, Technical Digest, Jun. 30, 1983, "Polarization Diversity Receiver", Okoshi et al.
Report of Institute of Electronics, Aug. 27, 1986 pp. 25-27 "Optical Polarization Automatic Control System for Optical Coherent Transmission", Yoshida et al.
Journal of Lightwave Technology, vol. LT-5, No. 2, Feb. 1987 "Polarization Independent Coherent Optical Receiver", Glance.
Hodgkinson, "Demodulation of Optical DPSK Using In Phase and Quadrature Detection", Electronic Letters, vol. 21, pp. 867-868, Sep. 12, 1985.

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