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A method is described for applying space-time coding implemented by Hadamard transform to SDM transmission. Experiments demonstrated that the method substantially improves mode dependent loss tolerance and enables transmission reach to be enhanced by 20%.
We proposed complementary spectral inversion for reserved-band-less optical phase conjugation with parametric gain and broad conversion bandwidth using a novel wavelength-exchanged configuration based on highly efficient PPLN waveguides. Fiber nonlinearity mitigation for two-carrier QPSK signal was successfully demonstrated.
We demonstrate 120.7-Tb/s SDM/WDM unrepeatered transmission over a 204-km 7-core fiber with aggregate spectral efficiency of 53.6 b/s/Hz using a remotely pumped 7-core EDFA and Raman amplification. 17.2-Tb/s (180 × 95.8 Gb/s) PDM-32QAM signals have been transmitted at each core.
We propose a polarization-independent PSA with a novel polarization-diversity loop configuration using highly efficient PPLN waveguides. Polarization-independent error-free operation for a 40-Gbit/s DQPSK signal and phase-regenerative amplification for an 80-Gbit/s PDM-QPSK signal with artificial phase noise were successfully demonstrated.
We demonstrated that impairments caused by chromatic dispersion, fiber nonlinearity, and the ASE of optical amplifiers were effectively suppressed using in-line PSA repeaters. Over 3200-km transmission of 28-Gb/s BPSK signal was achieved without dispersion compensation.
Nonlinear compensation with digital back-propagation can improve Q-factor by more than 1dB, proven by experiments. Simplification of propagation model is the key to suppress circuit size, whereas straight-forward implementation reaches 30-times larger than linear equalizers.
We evaluate fiber fuse characteristics of bend-insensitive optical fibers and show that hole-assisted fiber (HAF) is applicable as fiber fuse stopper in high-power optical transmission systems. We also clarify fiber fuse stopping mechanism of HAF.
We demonstrate the record capacity-distance product of 48.2 Petabit/s.km by using 111-Gb/s no-guard-interval coherent OFDM with 2-b/s/Hz spectral efficiency.
This paper introduces a technique that compensates for nonlinear inter-channel crosstalk in wavelength division multiplexing (WDM) transmission. Electronic pre- and post-compensation of four-wave mixing are experimentally shown in carrier phase-locked WDM.
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