Carrier suppressed return to zero (CSRZ) is the advanced modulation format used in optical communication.The difference between CSRZ and conventional RZ is that the CSRZ signal has the ‘π’ phase shift between adjacent bits. This phase alternation, in the optical domain, produces no DC component; thus, there is no carrier component for CSRZ. Please explain it briefly.
Amit Kumar Garg
In case of CSRZ transmitter the RZ optical signal after Mach-Zehnder modulator goes through phase modulator driven by analog sine wave generator at frequency equal to half of the bit rate. That will introduce a pi phase shift between any two adjacent bits and the spectrum will be modified such that the central peak at the carrier frequency is suppressed.
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