Exogenous tone dither rejection in optical switching

Details Exogenous tone dither rejection in optical switching Exogenous tone dither rejection in optical switching

2007-10-05

2009-08-11

Connelly-Cushwa, Michelle R. (Department: 2874)

Optical waveguides

With optical coupler

Switch

C385S016000

Reexamination Certificate

active

07574079

ABSTRACT:
Methods and apparatus for dither control of a micromirror using a servo control loop in an optical switching apparatus, an optical switching apparatus and optical network are disclosed. A servo control loop may use dither tone having two or more frequency components to dither an output driver that controls the position of a micromirror in an optical switch. The two components may be demodulated from an optical signal deflected by the micromirror. The optical signal may be fed into two band-pass filters. Each band-pass filter may have a pass band centered on a different one of the two frequency components. The envelope detector may compare the envelopes of the band-pass filter outputs. If the envelopes differ by more than a set threshold the output of the envelope detector may be forced to zero. Otherwise, the output of the envelope detector may be the sum of the two band-pass filter outputs.

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