All-optical phase and amplitude regeneration of return-to-zero differential phase shift keying data

  

Abstract: We report a novel implementation of an all-optical rephasing, reshaping, and reamplification differential phase shift keying (DPSK) regenerator. The rephasing is based on converting phase noise into amplitude noise by using an interferometric configuration and then eliminating the amplitude noise by using a semiconductor optical amplifier (SOA). The reshaping is performed using gain competition andgain compression in a saturated SOA. The scheme was tested using 10 Gbit/s, 2^23-1 pseudorandom bit sequence return-to-zero DPSK data. The measurement shows removal of the degraded data error floor with a 6 order-of- magnitude improvement in bit-error rate. The measured negative power penalty is about 4 dB. Mathematical analysis shows a reduction in DPSK phase-noise power by half.

Keywords: DPSK regeneration, Nonlinear optical signal processing, optical communications.

Download Full Paper: PDF (254 KB)

Download Full Paper: PDF (254 KB)