Method and system for duobinary coding of optical signals

Details Method and system for duobinary coding of optical signals Method and system for duobinary coding of optical signals

2007-06-26

2007-06-26

Tran, Dzung (Department: 2613)

Optical communications

Multiplex

Code division multiplexing

C398S078000, C398S190000

Reexamination Certificate

active

10137947

ABSTRACT:
A method and system for duobinary coding of optical signals, wherein a precoded duobinary signal is supplied to a phase modulator which converts it to a phase-modulated optical signal, an optical filter carries out the function of the coder and converts the phase-modulated signal to an optical duobinary signal, and the duobinary coding results in a reduction in the bandwidth. A wavelength division multiplex system is provided by precoding a number of binary signals and converting them to phase-modulated signals, which are in turn, combined via an optical multiplexer, wherein the multiplex signal formed in this way is supplied to an optical filter which operates simultaneously as a coder for all the signals and produces a group of duobinary signals, and a number of groups of duobinary signals can be interleaved in one another in order to produce a dense wavelength division multiplex signal.

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