Device for heterodyne detection of an optical signal and for red

Details Device for heterodyne detection of an optical signal and for red Device for heterodyne detection of an optical signal and for red

1991-08-06

1992-06-23

Coles, Sr., Edward L.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

H04B 1006

Patent

active

051248280

ABSTRACT:
Device for optical heterodyne detection of an optical signal beam and an optical transmission system provided with such a device. An optical heterodyne detection device is described in which with the aid of three controllable elements (A, B and C), to influence the state of polarization and having a limited control range, such as Faraday rotators or birefringent electro-optical crystals, the state of polarization of radiation originating from a local oscillator (30) is made to correspond to the signal beam transmitted through a long-distance transmission fibre (10).

REFERENCES:
patent: 4436376 (1981-02-01), Fergason
patent: 4752120 (1988-06-01), Shimizu
Mahon et al, "Compensational Deformation"; New Endless Polarization Matching Control Schemes for Optical Homodyne on Heterodyne Receivers which Require No Mechanical Drivers, 12th Conference of Optical Communications, Tech. Digest, vol. 1 pp. 267-270, Sep. 22-25, 1986.
Noe, "Endless Polarization Control for Heterodyne/Homodyne Receivers" SPIE vol. 630, Fiber Optics '1986 (Apr./May).
Okoshi, "Polarization Control Schemes for Het/Homodyne Optical Fiber Communications" Journal of Lightwave Tech., vol. LT-3, pp. 1232-1237, Dec. 85.
Rysdale, "Method of Overcoming Finite Range Limitation of Certain State of Polarization Control Devices in Automatic Polarization Schemes", Electronic Letters, vol. 22 #2, Jan. 16, 1986 pp. 100-102.
O. E. Delange, "Optical Heterodyne Detection", IEEE Spectrum, Oct. 1968, pp. 77-85.
Noe, "Endless Polarization Control Experiment with Three Elements of Limited Birefringence Range", Electronics Letters, vol. 22 No. 25, 1341-1343. Dec. 1986.

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