Dynamic optical phase shifter compensator

Details Dynamic optical phase shifter compensator Dynamic optical phase shifter compensator

2004-05-09

2008-10-14

Pyo, Kevin (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C359S279000, C359S256000

Reexamination Certificate

active

07435939

ABSTRACT:
A birefringent, electrically-controlled, wavelength selective, pixelated optical phase shifting device, in which the correct drive voltage for a desired phase shift through any pixel can be determined independently of changes in the drive voltage arising from changes in the environmental conditions, generally temperature. This is achieved by mounting a monitor phase shifting element controlled by its own drive voltage, in close proximity to the pixelated phase shifter, such that the monitor element and the phase shifter experience the same environmental condition. A probe optical beam of predefined wavelength is directed through the monitor element, and the transmitted beam measured as a function of the monitor drive voltage. This functional relationship is used to define the environmental condition in which the monitor element and the phase shifter, are situated, and the correct drive voltage for application to any phase shifter pixel can be determined.

REFERENCES:
patent: 6825966 (2004-11-01), Webb et al.
patent: 7039259 (2006-05-01), Corem et al.
patent: 2002/0080467 (2002-06-01), Damask
patent: 2003/0090775 (2003-05-01), Webb
patent: WO-02/071133 (2002-09-01), None
patent: WO-02/071660 (2002-09-01), None
patent: WO-03/009054 (2003-01-01), None
patent: WO-03/009073 (2003-01-01), None

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