Spatial polarization coding electro-optical transmitter

Details Spatial polarization coding electro-optical transmitter Spatial polarization coding electro-optical transmitter

1977-01-03

1978-07-25

Moskowitz, Nelson

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

350157, 250199, G02F 126

Patent

active

041032608

ABSTRACT:
A transmitter for producing an energy beam which has encoded thereon as a polarization state of the energy, angular position along a selected one of a plurality of dimensions across the beam. The transmitter comprises a laser unit for transmitting energy through a plurality of switchable modulators with each of said modulators comprising an electro-optical device, such as a 180.degree. retarder or a 90.degree. rotator, coupled between a pair of birefringent wedges. The wedges are configured such that when the associated electro-optical device is not energized the birefringence of the wedges cancel. When energized, the electro-optical device translates the polarization state of the energy passing therethrough such that the birefringence of the wedges add so as to cause a variation in the polarization across the beam. The spatial orientation of the two wedges in a given modulator determines the dimension across the beam encoded thereby.

REFERENCES:
patent: 3398918 (1968-08-01), Girault
patent: 3401590 (1968-09-01), Massey
patent: 3447855 (1969-06-01), Skinner
patent: 3572895 (1971-03-01), Schmidt et al.
patent: 3684350 (1972-08-01), Wentz
patent: 3719414 (1973-03-01), Wentz
Hunt, "A Variable Wedge Birefringent Compensator," 5/70, pp. 220-221, Applied Optics, vol. 9 #5, G-250.

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