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Over the years, the increased search and exchange of information lead to an increase of traffic intensity intodays optical communication networks. Coherent communications, using the amplitude and phase of the signal,reappears as one of the transmission techniques to increase the spectral efficiency and throughput of opticalchannels. In this context, this paper present a survey on format conversion of modulated signals using MZI-SOAs, based exclusively on all-optical techniques through wavelength conversion. We also present two proposal using all-optical techniques: One for the conversion of amplitude modulation signals to a continuous phase modulation format, and another technique for the conversion of OOK signals to QPSK and QAM signals. Both approaches are experimentally validated

Advanced optical modulation and format conversion