Integrated optical retroreflecting modulator

Details Integrated optical retroreflecting modulator Integrated optical retroreflecting modulator

1998-10-29

2000-09-05

Epps, Georgia

Optical: systems and elements

Optical modulator

Light wave temporal modulation

385 24, 359246, G02F 103

Patent

active

061151688

ABSTRACT:
A retroreflecting modulator including a lens, a light guide, a light modulator, and a reflective surface. Incident light falls on the lens, where it is focused as a spot on a focal surface. The light guide transmits the focused light to the light modulator, where it is modulated and reflected back, via the reflective surface and light guide, to the lens. The lens emits the modulated light in the opposite direction as the incident light. The preferred light-receiving and focusing device is a specialty sphere lens, the preferred light guide is a fiber optic plate, and the preferred light modulator is a liquid crystal modulator. The retroreflecting modulator may be spatially-unresolvable, where a single signal modulates the light, or spatially-resolvable, where the modulation signal depends upon the direction of the incident light.

REFERENCES:
patent: 4257672 (1981-03-01), Balliet
patent: 4777660 (1988-10-01), Gould et al.
patent: 5383042 (1995-01-01), Robinson
patent: 5600383 (1997-02-01), Hornbeck
patent: 5757992 (1998-05-01), Miller
patent: 5818035 (1998-10-01), Krivanek et al.
patent: 5953148 (1999-09-01), Mosely et al.
Swenson and Steed, Low Power FLC-based Retromodulator Communications System, 2990 SPIE Proceedings 296 (Feb 14, 1997).
Charles M. Swenson and Clark A. Steed, Low Power FLC-Based Retromodulator Communications System, 2990 Proceedings of Society of Photo-Optical Instrumentation Engineers 296 (Feb., 1997).

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