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We propose a phase-noise-tolerant coherent PM-QPSK system with differential coding and half-symbol-period timing-offset in polarizations. Owing to the improved phase noise tolerance, error-free operation of 10Gbaud PM-QPSK is experimentally demonstrated even using ∼30MHz-linewidth DFB laser.
We propose and demonstrate pump-phase-noise-tolerant 1-to-7 wavelength multicasting for QAM signals using flexible coherent multi-carrier pump. Less than 0.8dB penalty is obtained after multicasting with the elimination of phase noise from pump using coherent pumping.
With the recent trend of employing spectrally efficient multi-level modulation formats in optical communication systems, it is highly desirable to exploit the all-optical wavelength conversion (AOWC) schemes for formats, such as 16- or 64- quadrature amplitude modulation (QAM) signals. Since the linear and nonlinear phase noise is transferred with the data to the converted wavelength in AOWC subsystem,...
We experimentally demonstrate a 50-Gbps 16QAM wavelength conversion with <0.2dB penalty, based on FWM in HNLF using coherent pumps. The coherent pumping makes it independent of the phase noise from pumps and enables the use of cost-effective pump laser.
We propose and experimentally demonstrate optical data exchange scheme between 16QAM and QPSK with narrow spacing of 50GHz. The use of coherent pump makes it free of phase noise from pumps, and enables the use of low-cost DFB as pump source.
We experimentally demonstrate an optical wavelength shifting scheme of 20Gbaud 16QAM based on cascaded 2nd-order nonlinearities in PPLN using coherent pumps, which is free of the phase noise from pumps.
We propose a pump-linewidth-tolerant wavelength conversion scheme with coherent two-tone pump, and demonstrate high quality wavelength conversion of 64QAM signals with <0.3-dB penalty at BER of 10−3 even using 3.5MHz-linewidth DFB pump source.
A digital-signal-processing-assisted optical coherent detection of an uplink radio-over-fiber signal with a two-tone local light, which is insensitive to laser phase noises, is newly proposed and its phase noise cancellation effect is experimentally demonstrated.
Ultimately phase noise tolerant multi-level modulation technique for 16-QAM and beyond was introduced as a advanced modulation format. Then orthogonal labeling scheme using various orthogonal optical properties such as in optical codes, optical phases as well as multilevel modulation formats, were discussed for optical label switched networks.
We propose an optical phase noise extraction and amplification (OPNEA) technique. By applying OPNEA to phase noise monitoring for (D)PSK, 13-dB dynamic range and 0.2-dB/degree sensitivity were achieved with a 50-120-degree phase deviation.
We propose and experimentally demonstrate an optical phase noise extraction and amplification (OPNEA) technique for phase-shift keying (PSK) signals. It could effectively extract and amplify the phase noise carried in the incoming PSK signals. By applying this OPNEA technique to optical phase-noise (PN) monitoring, a 13-dB monitoring dynamic range and a 0.2-dB/degree monitoring sensitivity were achieved...
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