Polarization diversity optical heterodyne receiver with phase ad

Details Polarization diversity optical heterodyne receiver with phase ad Polarization diversity optical heterodyne receiver with phase ad

1989-07-28

1991-06-11

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

H04J 1006

Patent

active

050239465

ABSTRACT:
Two intermediate frequency signals, which are used in a polarization diversity optical heterodyne receiver operable according to demodulation and subsequent combination and have a common intermediate signal frequency variable in an intermediate frequency range, are subjected to delaying relative to each other and then combined into a combined intermediate frequency signal. A frequency discriminator (24) discriminates the intermediate signal frequency of the combined intermediate frequency signal to produce a control signal for use in stabilizing a local optical frequency of a local beam used in combination with a signal beam susceptible to polarization fluctuation. A delay may be given for the delaying to one of the two intermediate frequency signals alone. Alternatively, a delay may be given for the delaying to only one of two local beam components which are coupled to two signal beam components for use in producing the two intermediate frequency signals.

REFERENCES:
patent: 4829598 (1989-05-01), Auracher
K. Emura, M. Shikada, S. Yamazaki, K. Komatsu, I. Moto, and K. Mineumua, "400 Mb/s Optical DPSK Heterodyne Detection Experiments Using DBR Laser Diodes With External Optical Feedback", i IOOC-ECOC '85, Venice, Oct. 1985, pp. 401-404.
Yoshihisa Yamamoto, "Coherent Optical Fiber Transmission", IEEE Journal of Quantum Electronics, vol. QE-17, No. 6, Jun. 1981, pp. 919-935.
B. Glance, "Polirization Independent Coherent Optical Receiver", Journal of Lightwave Technology, vol. LT-5, No. 2, Feb. 1987, pp. 274-276.

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