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The proposed scheme introduces electrooptical modulation for frequency down-conversion to alleviate the requirement of devices for clock recovery, which is demonstrated in an 80-Gbit/s DQPSK system. Further, an I/Q mixer as a phase discriminator is used to monitor accumulated dispersion of received signal simultaneously.
We introduced phase modulator into coherent optical OFDM system and retrieved the electrical signal by phase restoration of optical field. This system proved to ameliorate some of the disadvantages of conventional coherent optical OFDM systems.
We propose a method to reduce the sampling rate of ADCs in optical OFDM systems with pre-distortion and aliasing, and demonstrate it in an experiment of 400-Gb/s multi-band CO-OFDM.
A novel method to simultaneously monitoring pulse carving misalignment and phase modulation depth in RZ-DPSK generation is proposed. It is simple but effective and requires only one low-speed detector and processing circuit.
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