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Phase-transparent optical data exchange of 40 Gbit/s differential phase-shift keying signals

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Abstract

We report the phase-transparent optical data exchange of differential phase-shift keying (DPSK) signals by exploiting the parametric depletion of nondegenerate four-wave mixing (FWM) in a highly nonlinear fiber. Theoretical analyses of nondegenerate FWM involving two signals and two pumps are presented. Analytical solutions are derived, indicating the exchange condition and the feasibility of phase-transparent data exchange. Optical data exchange between 10.7Gbit/s non-return-to-zero DPSK (NRZ-DPSK) and return-to-zero DPSK signals is implemented with a power penalty of ~1.5 dB at a bit-error rate (BER) of 109. Moreover, we demonstrate phase-transparent optical data exchange between two 40Gbit/s NRZ-DPSK signals with a power penalty of ~4.5 dB at a BER of 109.

© 2010 Optical Society of America

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