We analytically investigate the signal performance of orthogonal modulation with slow amplitude-shift keying (ASK) data superimposed upon a high-speed differential phase-shift keying (DPSK) signal. The receiver sensitivities for both the ASK and the demodulated DPSK signals are formulated based on a probability model, and their dependence on the bit rate and the extinction ratio of the ASK data is theoretically investigated. A simple result of analysis of DPSK data performance has been derived. We verified the analytical results by experimental measurements.
© 2005 Optical Society of America
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.4080) Fiber optics and optical communications : Modulation
(060.4250) Fiber optics and optical communications : Networks
(060.5060) Fiber optics and optical communications : Phase modulation
Ning Deng, Chun-Kit Chan, and Lian-Kuan Chen, "Characterization of the performance of optical amplitude-shift keying-differential phase-shift keying orthogonally modulated signals," Opt. Lett. 30, 818-820 (2005)