Chapter 6 summarizes all the works of the thesis and put forward some Suggestions to research optical PPM modulation and demodulation technique in the future.
第六章综述了本文的研究工作，提出了进一步研究光ppm调制解调技术的设想和建议。
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Semiconductor optical amplifier (SOA) is very fit for allopticalmodulation format conversion due to its high nonlinear characteristics, lower switch power and small size.
For SOA-based all-optical switching, because cross-phase modulation and cross-gain modulation is co-exist in SOA, the properties of each output port is different.