Front-end circulator for an optical device

Optical: systems and elements – Polarization without modulation – Polarization using a time invariant electric – magnetic – or...

Reexamination Certificate

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C359S490020, C385S011000

Reexamination Certificate

active

06956697

ABSTRACT:
The invention relates to an optical circulator for use as a front end for an optical device platform, which requires a pair of like-polarized sub-beams as input. A combined beam of light comprising a plurality of wavelength channels is input the optical circulator at an input port, and the pair of like-polarized sub-beams is launched via a pair of input/output ports into the optical device platform, wherein the sub-beams are modified. Within the optical device platform the combined beam of light is separated into individual channels, and one or more of the channels can be dropped or attenuated before the remaining channels are recombined into to modified sub-beams for output. The two modified sub-beams are launched back into the optical circulator, which directs the modified sub-beams to an output port remote from the input port. Any light reentering the optical circulator with the wrong polarization will neither exit the input nor the output port.

REFERENCES:
patent: 5574596 (1996-11-01), Cheng
patent: 5909310 (1999-06-01), Li et al.
patent: 6304380 (2001-10-01), Doerr
patent: 2001/0053022 (2001-12-01), Tai et al.
patent: 2002/0071181 (2002-06-01), Frisken
patent: 2002/0186914 (2002-12-01), Li

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