Regeneration of optical phase modulated signals

Optical communications – Optical repeater system – Regenerative

Reexamination Certificate

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C398S173000, C398S174000, C398S175000, C398S177000, C398S178000, C398S179000, C398S180000, C398S181000, C398S183000, C398S033000, C398S037000, C359S332000, C359S326000, C359S333000, C359S344000, C385S001000, C385S002000, C385S004000, C385S005000, C385S015000, C385S123000, C385S122000, C385S024000, C385S027000

Reexamination Certificate

active

07369779

ABSTRACT:
A regenerator for restoring the originally encoded optical phase of a differential-phase-shift-keyed signal. In an embodiment, the regenerator simultaneously provides limiting amplification and reduces amplitude noise based on a phase-sensitive optical amplifier that combines a weak signal field of a degraded input data with a strong pump field supplied by a local oscillator in a nonlinear interferometer. The two fields interact through degenerate four-wave mixing, and optical energy is transferred from the pump to the signal and vice versa. The phase sensitive nature of the optical gain leads to amplification of a specific phase component of the signal, determined by the input pump-signal phase difference and the incident signal phase is restored to two distinct states, separated by 180° according to the original encoding. Simultaneously, gain saturation of the pump wave by the signal wave results in limiting amplification of the signal wave for removing signal amplitude noise.

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