Coherent demodulation of 40-Gbit/s polarization-multiplexed QPSK signals with 16-GHz spacing after 200-km transmission

By S. Tsukamoto, D.-S. Ly-Gagnon, Kazuhiro Katoh, Kazuro Kikuchi. OFC/NFOEC Technical Digest. Optical Fiber Communication Conference, 2005., 2005

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Fundamentals of Coherent Optical Fiber Communications (2016, background): “(48) Note that the use of the complex amplitude on exp(−iω t) in this section is different from that in Section III.”
Coherent Optical 25.8-Gb/s OFDM Transmission Over 4160-km SSMF (2008, methodology): “In several coherent fiber-optic transmission systems carrier phase estimation is performed by using the 4th order nonlinearity [ 14 ], [15].”
Performance of Dual-Polarization QPSK for Optical Transport Systems (2009, background): “Coherent detection offers the advantage of access to the amplitude and phase of the optical electric field in the electronic domain at the receiver [1], [2].”
Power-Efficient Modulation Formats in Coherent Transmission Systems (2009, background): “Indeed, in recent experiments, the dual-polarization quadrature phase shift keying (DP-QPSK) modulation format, which is an independent QPSK modulation in each polarization component, has been demonstrated [4], [7]–[9].”
Evaluation of Sensitivity of the Digital Coherent Receiver (2008, background): “We have recently proposed and demonstrated a phase-diversity homodyne receiver that can demodulate the multilevel phase-shift keying ( -ary PSK) signal [2]–[4].”