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Carrier-Suppressed Return-to-Zero (CSRZ) is an optical line code.

Overview

In CSRZ the field intensity drops to zero between consecutive bits (RZ), and the field phase alternates by ? radians between neighbouring bits, so that if the phase of the signal is e.g. 0 in even bits (bit number 2n), the phase in odd bit slots (bit number 2n+1) will be ?, the phase alternation amplitude. In its standard form CSRZ is generated by a single Mach-Zehnder modulator

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