35-Tb/s C-band Transmission over 800 km Employing 1-Tb/s PS-64QAM signals enhanced by Complex 8 × 2 MIMO Equalizer

Kobayashi, Takayuki; Nakamura, Masanori; Hamaoka, Fukutaro; Nagatani, Munehiko; Wakita, Hitoshi; Yamazaki, Hiroshi; Umeki, Takeshi; Nosaka, Hideyuki; Miyamoto, Yutaka

doi:10.1364/ofc.2019.th4b.2

Cited by 42 publications

(34 citation statements)

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“…(9). The maximum NGMI target and FEC were based on a concatenated FEC with an aggregate overhead (OH) of ~21 % (total code rate, = 0.826) and an NGMI threshold of 0.857 [19]. Based on this 0.857 NGMI threshold, net 325-Gbps and 321.24-Gbps were achieved after BTB and 2-km SSMF transmissions, respectively.…”

Section: B Experimental Resultsmentioning

confidence: 99%

>100-GHz Bandwidth Directly-Modulated Lasers and Adaptive Entropy Loading for Energy-Efficient >300-Gbps/λ IM/DD Systems

Diamantopoulos

Yamazaki

Yamaoka

et al. 2021

J. Lightwave Technol.

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We demonstrate DML-based net 325-Gb/s at backto-back and 321.24-Gb/s after 2-km standard single-mode fiber transmissions for >300-Gbps/λ short-reach optical interconnects. Our net rate performance denotes an increase of ~34 % compared to our previous works, while the pre-FEC rates are >400 Gbps. The DML transmitter is based on a PPR-enhanced, >100-GHzbandwidth DML, fabricated by our novel membrane-III-V-on-SiC technology. Also wide-band, entropy-loaded DMT modulation is utilized based on a novel adaptive algorithm and via a digitallypreprocessed analog multiplexer. These results pave the way towards low-cost and energy-efficient Terabit Ethernet and a significant step towards achieving DML-based 400-Gbps/λ IM/DD systems in the future.

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Section: B Experimental Resultsmentioning

confidence: 99%

>100-GHz Bandwidth Directly-Modulated Lasers and Adaptive Entropy Loading for Energy-Efficient >300-Gbps/λ IM/DD Systems

Diamantopoulos

Yamazaki

Yamaoka

et al. 2021

J. Lightwave Technol.

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“…A free-running ECL with a linewidth of ~70 kHz was used as a local oscillator. The received signal was digitized using ADCs at 200 GS/s with 70-GHz bandwidth and post-processed off-line with a complex 8 × 2 MIMO equalizer [32]. The signal was demodulated using a pilot-aided adaptation algorithm [33].…”

Section: A Experimental Setupmentioning

confidence: 99%

“…Finally, the normalized generalized mutual information (NGMI) for the PS-36QAM was computed with the LLRs. We used the NGMI threshold of 0.857 of the outer BCH code [32] as criteria of signal quality.…”

Section: Msmentioning

confidence: 99%

Wide-Band Inline-Amplified WDM Transmission Using PPLN-Based Optical Parametric Amplifier

Kobayashi

Shimizu

Nakamura

et al. 2021

J. Lightwave Technol.

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This paper proposes an optical parametric amplifier (OPA), as an inline-repeater, using a periodically-poled-LiNbO3 (PPLN) waveguide with over-10-THz amplification bandwidth, and also presents wide-band wavelength-division-multiplexing (WDM) inline-amplified transmission with the OPA. Our PPLNbased OPA is polarization-independent and has a spectrally efficient configuration by filtering phase-conjugated signals (idlers). We implemented our PPLN-based OPA with half its ideal configuration with an over-10-THz amplification bandwidth because of the limited number of PPLN waveguides. The implemented OPA had 5.125-THz amplification bandwidth, gain of beyond 15 dB, and noise figure of less than 5.1-dB. The gain excludes the 5.6-dB loss of an idler rejection filter employed in the transmission experiment so that the implemented OPA can compensate 9.5-dB link loss of transmission fibers and optical components. A 3 × 30.8-km inline-amplified transmission with 41channel 800-Gbps WDM signal in 125-GHz spacing was successfully demonstrated using our PPLN-based OPA as an inline-repeater. The results also indicate that the OPA's amplification bandwidth can potentially be extended to 10.25 THz.

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“…Recent digital coherent technologies have dramatically increased the capacity and transmission distance in optical fiber transmission systems [1], [2]. However, the mitigation of fiber nonlinearity is still a major issue to overcome if we are to cope with the ever-increasing demand for transmission capacity in optical transport networks [3].…”

Section: Introductionmentioning

confidence: 99%

Nonlinearity Mitigation of PDM-16QAM Signals Using Multiple CSI-OPCs in Ultra-Long-Haul Transmission without Excess Penalty

Umeki

Kobayashi

Sano

et al. 2020

IEICE Trans. Commun.

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We developed a polarization-independent and reservedband-less complementary spectral inverted optical phase conjugation (CSI-OPC) device using dual-band difference frequency generation based on highly efficient periodically poled LiNbO 3 waveguide technologies. To examine the nonlinearity mitigation in a long-haul transmission using a large number of OPCs, we installed a CSI-OPC device in the middle of a pure silica core fiber-based recirculating loop transmission line with a length of 320 km. First, we examined the fiber-input power tolerance after 5,120-km and 6,400-km transmission using 22.5-Gbaud PDM-16QAM 10channel DWDM signals and found a Q-factor improvement of over 1.3 dB along with enhanced power tolerance thanks to mitigating the fiber nonlinearity. We then demonstrated transmission distance extension using the CSI-OPC device. The use of multiple CSI-OPCs enables an obvious performance improvements attained by extending the transmission distance from 6,400 km to 8,960 km, which corresponds to applying the CSI-OPC device 28 times. Moreover, there was no Q-factor degradation for the link in a linear regime after applying the CSI-OPC device more than 16 times. These results demonstrate that the CSI-OPC device can improve the nonlinear tolerance of PDM-16QAM signals without an excess penalty.

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35-Tb/s C-band Transmission over 800 km Employing 1-Tb/s PS-64QAM signals enhanced by Complex 8 × 2 MIMO Equalizer

Cited by 42 publications

References 0 publications

>100-GHz Bandwidth Directly-Modulated Lasers and Adaptive Entropy Loading for Energy-Efficient >300-Gbps/λ IM/DD Systems

>100-GHz Bandwidth Directly-Modulated Lasers and Adaptive Entropy Loading for Energy-Efficient >300-Gbps/λ IM/DD Systems

Wide-Band Inline-Amplified WDM Transmission Using PPLN-Based Optical Parametric Amplifier

Nonlinearity Mitigation of PDM-16QAM Signals Using Multiple CSI-OPCs in Ultra-Long-Haul Transmission without Excess Penalty

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