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OSNR improvement related to fiber loss and Aeff is theoretically and experimentally investigated in hybrid Raman/EDFA amplified systems. Pure-silica-core fiber with Aeff of 110µm2 is appropriate for terrestrial long-haul links, exhibiting optimal OSNR performance.
We propose a channel-reuse, long-reach WDM-PON scheme and an optical beat noise-based automatic wavelength management method. A 40 km reach, channel-reuse, 40 Gb/s/λ downstream and 10 Gb/s/λ upstream signal transmission on a 100 GHz WDM grid is demonstrated.
We show application schemes of the Walsh-Hadamard transform method to mitigate optical filtering and polarization dependent loss effects. Conducted experiments demonstrate for the first time that the method effectively improves overall performances of super-channel transmission.
We experimentally verified the effectiveness of a novel digital pre-emphasis technique to compensate limited DAC bandwidth for next generation flexible systems. A gain larger than 1dB/0.1nm OSNR at the 7%-FEC limit has been experimentally verified for 8, 16 and 32QAM.
Dual-loop optical feedback for phase noise reduction of period-one oscillations in an optically injected semiconductor laser is investigated via numerical simulation. The dual-loop optical feedback with incommensurate delay times effectively suppresses side peaks to below −94 dBc/Hz for photonic microwave generation.
We propose multi-redundancy optical coded modulation using superposed trellis. We experimentally prove that our scheme enables fine adaptive SE control and high coding gain of 7.1dB for 3-bit redundant 16QAM with quarterly reduced circuit complexity.
We present a novel nonlinear crosstalk mitigation technique based on subcarrier power pre-emphasis. We experimentally investigate performance improvement for four-subcarrier DP-QPSK superchannel in dispersion-uncompensated transmission for various transmission distances and guard bands.
A long-haul transmission of 1.28Tb/s quad-subcarrier PM-16QAM based superchannel (5.0bit/s/Hz) employing EDFA only/ EDFA-Raman amplification schemes is reported. Maximum recorded reach is 3,000km/ 2,050km and 3,350km/2,250km without and with DBP for LAPSCF/ SSMF, respectively.
We review recent single-carrier 400G schemes based on high baud rate signals with different spectrum efficiency (SE) based on QPSK and 16QAM. The long-haul performances under different transmission conditions and modulation formats are studied. The digital signal processing for 400G signal recovery is also discussed.
Wavelength conversion of a 144-Gbit/s DP-64QAM signal is demonstrated for the first time. An improved counter-dithering pump scheme realizes high efficiency and negligible phase noise, resulting in only 1-dB Q-factor penalty at 36-dB output OSNR.
We report on fiber nonlinearities based traffic allocation strategies, supporting 240Gb/s and 480Gb/s PM-16QAM channel upgrades, and show that, for both high and low dispersion fibers, homogenous and heterogeneous traffic allocation enables comparable transmission performance.
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