Abstract
A receiver configuration using a single shared delay interferometer (DI) for optical differential phase-shift keying (DPSK) wavelength-division multiplexing (WDM) signals is demonstrated and investigated in 40-Gbit/s signal transmission. Experiment comparison between the proposed and conventional configurations is performed for signal performance and a 3-dB bandwidth of the receiver sensitivity penalty. The wavelength mismatch of optical components used and the effects are measured to investigate the wavelength dependency of the proposed configuration. This demonstrates that there is no difference in performance between the two configurations and between WDM channels in the proposed configuration. Thus, it is suggested that the proposed configuration using a single DI can be applied for 20 WDM channels between 1531.116 and 1561.419 nm, with 200-GHz channel spacing in a bandwidth of >30 nm, for receiving DPSK signals.
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