Double-pass polarization-independent signal processor and...

Details Double-pass polarization-independent signal processor and... Double-pass polarization-independent signal processor and...

2006-03-14

2006-03-14

Lee, John D. (Department: 2874)

Optical: systems and elements

Optical frequency converter

C359S490020

Reexamination Certificate

active

07012739

ABSTRACT:
An apparatus includes a polarization beam splitter, at least two reflectors and first and second polarization rotation devices. The polarization beam splitter and the at least two reflectors are arranged in a loop that is capable of propagating a clockwise signal component and a counterclockwise signal component. The first polarization rotation device is located in the loop between the polarization beam splitter and a first reflector of the at least two reflectors. The second polarization rotation device is located in the loop between the polarization beam splitter and an additional reflector of the at least two reflectors. The first polarization rotation device includes a serial arrangement of a reciprocal rotator and a nonreciprocal rotator.

REFERENCES:
patent: 4868515 (1989-09-01), Reintjes et al.
patent: 4958908 (1990-09-01), Rockwell et al.
patent: 2002/0179912 (2002-12-01), Batchko et al.
patent: 2004/0150876 (2004-08-01), Dagenais et al.
patent: 2001127316 (2001-04-01), None

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