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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 demonstrate nonlinear phase-shift cancellation by maximum-ratio combining WDM signal and its phase-conjugate lights pair in multi-core fiber diversity transmission. By compensating chromatic dispersion in a span-by-span manner. 4.3dB Q-value peak enhancement from the single signal is experimentally confirmed.
An adaptive MIMO equalization method is presented for few-mode fiber transmission where various differential mode delays (DMDs) simultaneously occur. Evaluation using experimental data shows its use of sparsity to promote equalization effectively deals with various DMDs to suppress the noise.
We experimentally evaluate the relationship between mode dependent loss (MDL) and Q penalty for few-mode fibre transmission. We employ a low-MDL recirculating loop and free-space-optics type MDL equaliser and transmit 3-mode signals with PDM-16QAM modulation.
We demonstrate 12-core × 3-mode dense SDM transmission over 527 km graded-index multi-core few-mode fiber without mode-dispersion management. Employing low baud rate multi-carrier signal and frequency-domain equalization enables 33.2-ns DMD compensation with low computational complexity.
This paper demonstrated a 4.5dB Q-value improvement by realizing maximum-ratio combining in phase-conjugate lights pair diversity transmission through a multi-core fiber. Simulations confirm cancellation of the spatial correlation component in the enhanced amplified-spontaneous emission noise.
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 review the capabilities of phase sensitive amplifiers based on periodically poled LiNbO3 (PPLN) waveguides for optical communication. Specifically, we discuss their unique low noise amplification, phase and amplitude regeneration in multi-span transmissions, and multilevel phase coding signal amplification.
This paper evaluates the Q-factor improvement by maximum ratio combining for optical diversity transmission signals under the condition of the parametric process due to the Kerr effect and group-velocity dispersion.
We demonstrate 43-Tbit/s transmission over 67.4-km seven-core fiber using a single source. Each of the 6 outer cores carries 6 Nyquist-WDM channels using 320-Gbaud Nyquist-OTDM-PDM-QPSK 330-GHz spaced, and the center core carries 10-GHz clock pulses.
An inter-core crosstalk measurement method in a multi-core erbium-doped fibre amplifier that uses a single-wavelength signal with multiple intensity tones is investigated. Its feasibility is confirmed and the output signal power dependence of the crosstalk values for the same signal gains between cores is successfully characterised.
We review the capabilities of phase sensitive amplifiers based on PPLN waveguides for optical communication. Specifically, we discuss their unique low noise amplification, phase and amplitude regeneration in multi-span transmissions, and multilevel phase coding signal amplification.
We demonstrate dense SDM transmission of 20-WDM multi-carrier PDM-32QAM signals over a 40-km 12-core × 3-mode fiber with 247.9-b/s/Hz spectral efficiency. Parallel MIMO equalization enables 21-ns DMD compensation with 61 TDE taps per subcarrier.
We have experimentally clarified the optical amplification characteristics of a remotely pumped multicore erbium-doped fiber amplifier system. The pumping efficiencies of the system are ∼4 times higher than those of the distributed Raman amplification system.
We demonstrate 12-core fiber bidirectional long-haul transmission with sub-petabit-class capacity (2 × 344 Tb/s). Inter-core crosstalk management and multicarrier nonlinear compensation enabled the longest distance of 1500 km in SDM transmission with unidirectional capacity over 300 Tb/s.
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.
We demonstrate a phase-noise linear increment proportional to the spectral mode number of a 25-GHz-spaced frequency comb generated from a phase-modulated laser by using the beat note between each comb mode and a tunable laser.
We present spectrally-efficient elastic optical path networks for the 400 Gbps and 1 Tbps era. They enable rate/distance-adaptive spectrum allocation in a highly spectrum-efficient manner, and IP traffic offloading to an elastic optical layer.
We propose a translucent elastic optical network based on a virtualized elastic regenerator. Using a real-time 128-Gb/s spectrum-selective subchannel regenerator, we verify the concept through mixed-rate superchannel regeneration and frequency-slot merger with spectrum conversion.
The characteristics of the scattering that occurs in the middle of an optical fibre when a bubble train forms as a result of the fibre fuse that is induced when a high power signal is launched into the fibre is investigated for the first time. It was found that the maximum scattering angle of the light, which is scattered at the top of the bubble train, is around 160°, regardless of the presence of...
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