A demultiplexing scheme based on semiconductor optical amplifier (SOA) and optical filter for optical time division multiplexing differential quadrature phase shift keying (OTDM-DQPSK) system is proposed and investigated experimentally. With only a common half baudrate electrical clock modulated 33% duty cycle return-to-zero (RZ-33) optical clock signal as pump, this scheme is cost-effective, energy-efficient, and integration-potential. A proof-of-concept experiment is carried out for the demultiplexing of a 2 x 40-GBd OTDM-DQPSK signal. Error-free performance is demonstrated, and the average power penalty for both channels is about 3 dB.
© 2012 Chinese Optics Letters
Fiber Optics and Optical Communications
Hui Wang, Deming Kong, Yan Li, Junyi Zhang, Jian Wu, and Jintong Lin, "Half baudrate electrical clock based demultiplexing scheme for OTDM-DQPSK signal using SOA and optical f ilter," Chin. Opt. Lett. 10, 040601- (2012)