Optical link

Optical communications – Transmitter – Having particular modulation

Reexamination Certificate

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Details

C398S185000, C398S187000, C398S200000, C398S214000

Reexamination Certificate

active

07657189

ABSTRACT:
A system having a first optical modulator operates in a non-linear region thereof and fed by: an input radio frequency signal; and, a first optical frequency signal having a wavelength λ2. A second optical modulator operates in a linear region thereof and fed by: a fractional portion of the input radio frequency signal phase shifted relative to the input radio frequency signal by nπ radians where n is an odd integer; and a second different optical frequency signal wavelength λ1. A first photodiode is fed by an output of the first optical modulator. A second photodiode is fed by an output of the second optical modulator and a fractional portion of an output of the first optical modulator. An amplifier is fed by the second photodiode. A subtractor is fed by the amplifier and the first photodiode.

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