Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 24, Issue 1, Pages 54-64Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2005.862481
Keywords
alternative modulation formats; differential phase-shift keying (DPSK); differential quadrature phase-shift keying (DQPSK); dispersion compensation; fiber optics communications; nonlinear phase noise; periodically poled lithium niobate (PPLN); phase conjugation; phase-shift keying; spectral inversion
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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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