Abstract
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
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