Coherent phase-shift-keying

Details Coherent phase-shift-keying Coherent phase-shift-keying

2005-08-15

2010-06-29

Bello, Agustin (Department: 2613)

Optical communications

Receiver

Heterodyne

C398S208000, C398S204000, C398S209000, C398S213000

Reexamination Certificate

active

07747177

ABSTRACT:
A receiver for coherent detection of a PSK modulated optical carrier includes an optical detector, digital-to-analog converters, and a digital module. The optical detector is configured to mix the modulated optical carrier with two phase components of a reference optical carrier and to produce analog output signals representative of optical signals produced by said mixing. The digital-to-analog converters are connected to receive the analog output signals and to produce digital signals from the received analog output signals. The digital module is connected to receive the digital signals and to perform one of compensating the received digital signals for a conjugate phase misalignment between the mixed components, extracting phase of the received digital signals, and estimating a frequency offset between the two carriers from the received digital signals.

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