Optical apparatus

Details Optical apparatus Optical apparatus

1995-12-26

1998-03-17

Nelms, David C.

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359495, G02B 530

Patent

active

057293775

ABSTRACT:
A walk-off device is used to split an incoming beam into two parallel outgoing beams having orthogonal polarization. A polarization flipper is positioned to change the polarization of one of the two beams exiting from the walk-off device so that the two beams are parallel and have essentially identical polarizations. A nonreciprocal device receives the two beams, and the resulting apparatus is a polarization independent nonreciprocal device. Conversely, a polarization flipper flips the polarization of one of the two parallel beams of like polarizations into orthogonal polarizations and subsequently a walk-off device combines or superimposes these two beams to form an unpolarized single beam.

REFERENCES:
patent: 4178073 (1979-12-01), Uchida et al.
patent: 4492436 (1985-01-01), Bergmann
patent: 5251057 (1993-10-01), Guerin et al.
patent: 5262892 (1993-11-01), Nakamura
patent: 5267078 (1993-11-01), Shiraishi et al.
patent: 5381261 (1995-01-01), Hirai et al.
patent: 5414541 (1995-05-01), Patel et al.
patent: 5436755 (1995-07-01), Guerin
patent: 5446578 (1995-08-01), Chang et al.

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