Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1982-08-19
1985-09-10
Corbin, John K.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
350332, 350347E, 455605, 455611, 455616, 455617, G02F 113
Patent
active
045402434
ABSTRACT:
A light modulator for generating a beam of amplitude-modulated light including a source of polarized light, at least one and preferably two liquid crystal cells having a thin layer of nematic liquid crystals of positive dielectric anisotropy through which the polarized light is directed to produce a beam of light having a phase shift corresponding to a modulating electrical signal which is applied to each of the liquid crystal cells. The liquid crystal cells in addition have a continuing electrical bias applied across the layers in order to achieve the rapid response times necessary to achieve phase modulation of the polarized light. The resulting phase-modulated light is converted in a linear polarizer to amplitude-modulated light corresponding to the modulating electrical signal. The amplitude-modulated light is detected in a suitable light detector which generates an electrical signal corresponding to the modulating electrical signal. The linear polarizer may be oriented with either the transmitter or the receiver. A communication system involving a transmitting modulator and a receiving demodulator transmits communication through light either as phase-modulated light or as amplitude-modulated light.
REFERENCES:
patent: 2039812 (1936-05-01), Leib et al.
patent: 3214590 (1965-10-01), Schactman
patent: 3277396 (1966-10-01), Statz et al.
patent: 3495189 (1970-02-01), Le Craw
patent: 3584220 (1971-06-01), Nomura
patent: 3654473 (1972-04-01), Nussmeier
patent: 3675022 (1972-07-01), Nelson et al.
patent: 3694053 (1972-09-01), Kahn
patent: 3790251 (1974-02-01), Wysocki et al.
patent: 4131791 (1978-12-01), Lego, Jr.
patent: 4436376 (1984-03-01), Fergason
Niblack, W. & Wolfe, E. "Polarization Modulation and Demodulation of Light," Applied Optics, vol. 3, No. 2 (Feb. 1964), pp. 277-279.
Corbin John K.
Gallivan Richard F.
Murray Thomas H.
LandOfFree
Method and apparatus for converting phase-modulated light to amp does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for converting phase-modulated light to amp, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for converting phase-modulated light to amp will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1425154