Generation and transmission analysis of 4-ary frequency shift keying based on dual-parallel Mach-Zehnder modulator

摘要

We proposed an optical 4-ary frequency shift keying (FSK) modulation scheme applying dual-parallel Mach-Zehnder (MZ) modulator.The 4-ary FSK based on the single-side-band modulation scheme can greatly lower the transmission speed in each sub-carriers and increase the transmission performance,comparing with the 2-FSK signal.The transmission performance of the 4-ary FSK was demonstrated after a 50 km single mode fiber.The results showed that the 4-ary FSK can realize error-free transmission.Moreover,we analyzed the influence of factors (such as disperse compensation and demodulation bandwidth) on the transmission performance in this paper.The analysis of the influenced factors can provide a theoretical basic for experiment.