Modulator-based sinc-sequence sampled time and frequency multiplexed QAM signal transmission

A simple technique for the orthogonal time multiplexing and demultiplexing of quadrature amplitude modulated (QAM) signals is demonstrated. To demultiplex a time signal from a parallel time-wavelength multiplexed superchannel, a Mach-Zehnder Modulator is sufficient for I and Q without the need of any optical filter.