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We review the capabilities of optical parametric amplifiers based on periodically poled LiNbO3 (PPLN) waveguides for optical communication. Specifically, we discuss phase and amplitude regeneration using a phase sensitive amplifier and nonlinearity mitigation using an optical phase conjugator in multi-span transmissions.
We review the simultaneous mitigation of nonlinear impairments in WDM signal transmission using optical phase conjugation (OPC). Specifically, we discuss reserved-band-less, guard-band-less, and polarization independent OPC based on complementary spectral inversion.
We propose a low-complexity decoding scheme that is 8.68e-4 times that of conventional optimal decoding for 8D-16QAM. Experiments confirm that the proposed scheme allows 9-WDM 600-Gbps/ch transmission over 3,500km without penalty.
We generated a 1-Tb/s single-carrier PDM-16QAM optical signal using InP MUX-DAC modules and an integrated CSRZ-OTDM modulator. The high symbol rate of 125 Gbaud was achieved by combining electronic and optical time-domain multiplexing.
We demonstrate a high baud-rate data transmission using digital-preprocessed-analog-multiplexed DAC and spectral-narrowing mitigation algorithm. Over 12,120 km transmission of 96Gbaud PDM-QPSK WDM signal with 100-GHz of spacing has been achieved.
We review recent progress in space division multiplexed (SDM) transmission, and our proposal and the first demonstration of dense space division multiplexing (DSDM) towards ultra-high capacity optical transport systems.
We review recent dense space division multiplexing (DSDM) transmission technologies for multi-core / multi-mode fibre and discuss issues toward future DSDM long haul transport systems.
We proposed an ultra-wide-band DAC configuration consisting of a digital preprocessor, two sub-DACs, and an analog multiplexer. The output bandwidth is nearly doubled from that of the sub-DACs. The idea was verified by a 160-Gbps Nyquist PAM4 transmission.
We review recent progress in ultra-high capacity transmission based on dense space division multiplexing (DSDM) for future scalable optical transport networks, and present the latest multi-core multi-mode fiber, spatial multi/demultiplexers, and MIMO signal processing technique.
We generated a 56-Gbaud single-carrier PDM-16QAM signal using a single integrated modulator driven with 28-Gbaud electronic signals. Two orthogonal CSRZ pulses generated in the modulator are used for spectrally efficient OTDM.
We demonstrate WDM transmission of 75-Gbaud PDM-16QAM signals over 1,920 km. InP-based high-speed and compact MUX-DAC integrated modules (bandwidth exceeds 40 GHz) enable the long haul transport of 1-Tb/s superchannels composed of just two subcarriers.
We review recent progress in space division multiplexed (SDM) transmission, and examine our experimental demonstration of dense SDM (DSDM) using both multi-core and multi-mode, which provides a key advance to ultra-high capacity transmission.
Recent developments in high capacity transmission technologies based on multi-core fiber are reviewed. Propagation-direction interleaving with dual-ring structure 12-core MCF is promising for suppressing inter-core crosstalk and enables spectrally-efficient long-haul transmission.
This paper describes large capacity long haul transmission technologies based on multi-core fibers. 12-core fibers with dual-ring structure and propagation-direction interleaving are promising in suppressing crosstalk penalty. A large capacity transmission experiment using these techniques is reviewed.
This paper discusses the technologies need for 100-Tb/s-class ultra-high capacity optical transmission systems with channel rates of 400 Gb/s and above focusing on spectrally-efficient higher-order multi-level modulation with single-carrier frequency-division multiplexing.
The paper reviews recent works and issues on the next generation OTN for the future high-speed Ethernet transport. We demonstrate the feasibility of the over 40 Tbps-class OTN that supports client signals with 400Gbps.
We review key technologies for 100-Tb/s-class high capacity optical transmission systems with 400-Gb/s channel rates focusing on multi-level modulation and spectrally efficient optical multiplexing, and describe pilot-assisted single-carrier frequency-division multiplexing technique.
We successfully demoustrate PDM-16-QAM transmission over 1200 km, by using a novel receiver architecture composed of a spectrum-narrowed adaptive-filter and maximum-likelihood sequence estimators. The architecture contributes 300-km of distance extension.
We demonstrate 11.2-Tb/s transmission of 12.5-GHz spaced 120-Gb/s PDM 64-QAM signals over 160 km by using a digital coherent receiver with pilotless demodulation algorithms. The spectral efficiency of 9.0 b/s/Hz is the highest reported for 100-Gb/s/ch-class transmission.
We evaluate the OSNR tolerance of 111Gb/s No-guard interval OFDM signal using low sampling rate analogue-to-digital converter. The back-to-back experiment shows that the OSNR penalty is less than 0.1dB when using 1.4 times oversampling rate.
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