Method for synchronized polarization switching of an optical tra

Details Method for synchronized polarization switching of an optical tra Method for synchronized polarization switching of an optical tra

1989-09-26

1990-10-23

Orsino, Joseph A.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455610, 455616, 455619, 455608, 375 62, 375 67, G02F 100, H04B 1000, H01S 300

Patent

active

049658573

ABSTRACT:
A method for generating an FSK-modulated optical signal with an optical two-filter FSK super-heterodyne receiver. The optical signal has two different polarization conditions that are orthogonal to one another. Due to orthogonal conditions, polarization-independent reception is possible. Synchronized polarization shifting occurs to generate a polarized modulated optical signal having alternating orthogonal polarization conditions. A delay stage for delaying the switching signal by one-half a clock period ensures accurate synchronization. The frequency shift of the FSK-modulated signal can be freely selected while maintaining excellent bandwidth characteristics and optimum sensitivity.

REFERENCES:
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patent: 4831663 (1989-05-01), Smith
patent: 4893352 (1990-01-01), Welford
patent: 4904963 (1990-02-01), Heidel
IEEE Journal of Quantum Electronics, vol. QE-13, No. 4, Apr. 1977, pp. 122-128.
Electronics Letters, 17th Mar. 1988, vol. 24, No. 6, pp. 358-360.
Electronics Letters, 4th Dec. 1986, vol. 22, No. 25, pp. 1341-1343.
Electronics Letters, 12th Feb. 1987, vol. 23, No. 4, pp. 168-169.
Electronics Letters, 7th May 1987, vol. 23, No. 10, pp. 513-514.

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