Abstract
FM (Frequency Modulation) subcarrier multiplexing using multitone modulation for optical coherent communication system have been firstly introduced to maximize the bandwidth utilization, where the optimized number of bits allocated in each subcarrier is defined. Each subcarrier transmitting different number of data bits is modulated by the M-QAM. When we implement FDM to divide the given bandwidth within FM channel, the spectrum of the subcarrier signals in the given FM bandwidth is the quadratic noise.
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