Delay-interferometer based timing alignment monitoring for data and clock signal in optical RZ-DPSK and RZ-OOK systems

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• 作者：Jing Xu ; Kin-Man Chong ; Lian-Kuan Chen
• 关键词：Differential phase-shift keying (DPSK) ; ON– ; OFF keying (OOK) ; Monitoring ; Synchronization
• 刊名：Optical Fiber Technology
• 出版年：2010
• 出版时间：August 2010
• 年：2010
• 卷：16
• 期：4
• 页码：236-239
• 全文大小：596 K

文摘

A simple scheme for monitoring the alignment status between the pulse carver and the data modulator in both return-to-zero differential phase-shift keying (RZ-DPSK) and return-to-zero ON–OFF keying (RZ-OOK) systems is proposed and experimentally demonstrated. Not relying on any high-speed components, the scheme needs only an athermal delay-interferometer with properly designed delay and one or two optical power meters. For 10-Gb/s RZ-DPSK signals with a duty cycle of 50 % , a large monitoring power dynamic range (MPDR) of 13 dB was observed using differential monitoring. For 10-Gb/s RZ-OOK signals, the MPDR of 2 dB was also observed. The feasibility of the proposed scheme for RZ-DPSK and RZ-OOK signals with a duty cycle of 33 % was also investigated. The proposed scheme is also applicable to the single-modulator transmitter configuration, in which the data signal and the clock are mixed in the electrical domain.