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Optical phase conjugation for ultra long-haul phase-shift-keyed transmission

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9 Author(s)
Jansen, S.L. ; Commun. Technol. Basic Res. & Applic., Univ. of Technol., Eindhoven, Netherlands ; van den Borne, D. ; Spinnler, B. ; Calabro, S.
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Nonlinear phase noise (Gordon-Mollenauer phase noise) can limit the transmission distance for phase-shift-keyed modulation formats. In this paper, the compensation of nonlinear phase noise by a midlink optical phase conjugation (OPC) is studied. A proof-of-principle experiment is presented showing an over 4-dB improvement in Q factor when OPC is employed in a differential phase-shift-keying (DPSK) system. Also, an ultra long-haul OPC-based differential quadrature phase-shift-keying (DQPSK) transmission experiment is studied to show the impact of self-phase modulation (SPM)-induced impairments, including nonlinear phase noise, in a transmission line. OPC results in a 44% increase in transmission distance when compared to a "conventional" transmission system using dispersion compensating fiber (DCF) for chromatic dispersion compensation.

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Lightwave Technology, Journal of  (Volume:24 ,  Issue: 1 )