DQPSK/QPSK modulation at 40–60 Gb/s using low-loss nested silicon Mach-Zehnder modulator

44.6-Gb/s DQPSK and 50-to-64 Gb/s QPSK modulation are demonstrated using low-loss nested Silicon MZ modulator with fiber-to-fiber loss of 10dB. Dispersion tolerance of +/-80 ps/nm is observed in the DQPSK transmission.