Abstract
In this paper, we demonstrated a signed chromatic dispersion (CD)
monitoring method of 10 GHz nonreturn-to-zero differential phase-shift
keying (NRZ-DPSK) and return-to-zero differential phase-shift keying
(RZ-DPSK) signals by using asynchronous delay-tap sampling and an imperfect
tuned delay interferometer. This method could monitor not only the value but
also the polarity of residual CD. The demodulated signals show amplitude
shoulders on the rising edge or the trailing edge with CD accumulation.
Delay-tap sampling scatter plots could reflect this signal distortion by a
unique characteristic and realize the signed CD monitoring. The monitoring
range can be up to ${\pm}400$ and ${\pm}720$ ps/nm for NRZ-DPSK and RZ-DPSK signals, respectively. Simulation
and experimental results are also proposed.
© 2009 IEEE
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