Reduced Dispersion Duplex DQPSK Radio-Over-Fiber Communications Using Single-Laser-Based Multiple Side-Bands

Multiple side-bands are generated from a single laser diode with the aid of optical carrier suppression, which facilitates the transmission of reduced-rate parallel streams mapped to the side-bands. As a benefit, all the optical signal processing tasks, including demultiplexing of a high-rate signal into multiple low-rate signals can be performed at the central unit. The technique can also be useful in reducing the effects of dispersion in case of high-frequency Radio Over Fiber (ROF)communications by transmitting a single-data rate signal as multiple low-rate signals using the side-bands generated. We demonstrate the duplex transmission of a bit-rate of 768 Mbit/s over a 50 km fiber section using three side-bands in each direction. The multiple side-band aided system has a BER performance, which is close to that of the idealized benchmarker operating in a back-to-back mode.