A Spatially-coupled Type LDPC Code with an NCG of 12 dB for Optical Transmission beyond 100 Gb/s

Sugihara, Kohei; Miyata, Yoshikuni; Sugihara, Takashi; Kubo, Kazuya; Yoshida, Hideo; Matsumoto, Wataru; Matsukawa, Takashi

doi:10.1364/ofc.2013.om2b.4

Cited by 91 publications

(59 citation statements)

References 4 publications

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“…As shown in Fig. 4, the Q factors of all 76 channels for seven cores of MCF were confirmed to be over 5.0 dB, which exceeds the limit of assumed forward error correction (FEC) with 25.5 % overhead (spatially-coupled type irregular lowdensity parity-check code-based soft-decision FEC (LDPCbased SD-FEC) with BCH code) [9,10]. Moreover, we found that the measured Q factors at 1600 nm were about 2 dB lower than at 1580 nm.…”

Section: Resultsmentioning

confidence: 82%

WDM/SDM transmission of 76 × 128-Gbit/s Nyquist-pulse-shaped DP-QPSK Signals over 4,200 km using cladding pumped 7-Core EDFA

Takeshima

Tsuritani

Igarashi

et al. 2015

2015 Opto-Electronics and Communications Conference (OECC)

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Section: Resultsmentioning

confidence: 82%

WDM/SDM transmission of 76 × 128-Gbit/s Nyquist-pulse-shaped DP-QPSK Signals over 4,200 km using cladding pumped 7-Core EDFA

Takeshima

Tsuritani

Igarashi

et al. 2015

2015 Opto-Electronics and Communications Conference (OECC)

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“…), corresponding to the typical Q 2 BER threshold of the stateof-the-art SD-FEC having a code rate of 0.8 [42,43]. Accordingly, we will use 0.85 as the target of the normalized GMI throughout this chapter.…”

Section: à2mentioning

confidence: 99%

Nonlinearity-Tolerant Modulation Formats for Coherent Optical Communications

Kojima¹,

Koike‐Akino²,

Yoshida³

et al. 2018

Selected Topics on Optical Fiber Technologies and Applications

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Fiber nonlinearity is the main factor limiting the transmission distance of coherent optical communications. We overview several modulation formats intrinsically tolerant to fiber nonlinearity. We recently proposed family of 4D modulation formats based on 2-ary amplitude 8-ary phase-shift keying (2A8PSK), covering the spectral efficiency of 5, 6, and 7 bits/4D symbol, which will be explained in detail in this chapter. These coded modulation formats fill the gap of spectral efficiency between DP-QPSK and DP-16QAM, showing superb performance both in linear and nonlinear regimes. Since these modulation formats share the same constellation and use different parity bit expressions only, digital signal processing can accommodate those multiple modulation formats with minimum additional complexity. Nonlinear transmission simulations indicate that these modulation formats outperform the conventional formats at each spectral efficiency. We also review DSP algorithms and experimental results. Their application to time-domain hybrid modulation for 4-8 bits/4D symbol is also reviewed. Furthermore, an overview of an eight-dimensional 2A8PSK-based modulation format based on a Grassmann code is also given. All these results indicate that the 4D-2A8PSK family show great promise of excellent linear and nonlinear performances in the spectral efficiency between 3.5 and 8 bits/4D symbol.

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“…As high gain soft decision FEC for the real-time DSP, we propose a spatially-coupled-like irregular LDPC code which combines a spatially-coupled method with an irregular LDPC code [14]. To achieve good performance, careful combination is necessary.…”

Section: Key Techniques Of Real-time Dsp-lsimentioning

confidence: 99%

400Gbit/s/ch Field Demonstration of Modulation Format Adaptation Based on Pilot-Aided OSNR Estimation Using Real-Time DSP

Okamoto

Yonenaga

Horikoshi

et al. 2017

IEICE Trans. Commun.

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SUMMARYWe describe a field experiment of flexible modulation format adaptation on a real-time 400 Gbit/s/ch DSP-LSI. This real-time DSP-LSI features OSNR estimation, practical simplified back propagation, and high gain soft-decision forward error correction. With these techniques, we have successfully demonstrated modulation format allocation and transmission of 56-channel 400 Gbit/s-2SC-PDM-16QAM and 200 Gbit/s-2SC-PDM-QPSK signals in 216 km and 3246 km standard single mode fiber, respectively.

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A Spatially-coupled Type LDPC Code with an NCG of 12 dB for Optical Transmission beyond 100 Gb/s

Cited by 91 publications

References 4 publications

WDM/SDM transmission of 76 × 128-Gbit/s Nyquist-pulse-shaped DP-QPSK Signals over 4,200 km using cladding pumped 7-Core EDFA

WDM/SDM transmission of 76 × 128-Gbit/s Nyquist-pulse-shaped DP-QPSK Signals over 4,200 km using cladding pumped 7-Core EDFA

Nonlinearity-Tolerant Modulation Formats for Coherent Optical Communications

400Gbit/s/ch Field Demonstration of Modulation Format Adaptation Based on Pilot-Aided OSNR Estimation Using Real-Time DSP

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