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This paper compares the effects of amplified spontaneous emission and  Q -factor for advanced modulation formats of carrier-suppressed return-to-zero (RZ), duo-binary and differential phase-shift keying (DPSK) for single and multichannel. In case of single-channel transmission, only one channel is analyzed, and for multichannel transmission, eight channels are analyzed. Main focus is to study system impairments caused due to linear and nonlinear effects. We have simulated single-channel 40 Gbit/s system and eight-channel 40 Gbit/s dense wavelength division multiplexing (DWDM) system for total five spans with each span is equal to 50 km, with a channel spacing of 100 GHz (in case of eight-channel system) for all three formats. In case of DPSK, we have considered RZ-DPSK with 33% and 66% duty cycle and comparison is made between them in terms of  Q -factor. We have reported the best format for single channel as well as for multichannel among three formats and we have also listed the channels that are worst affected by nonlinearities and have least  Q -factor.

Performance Analysis of Advanced Modulation Formats at 40 Gbit/s for Single Channel and Multichannel