C-band 56-Gb/s PAM4 transmission over 80-km SSMF with electrical equalization at receiver

Tang, Xizi; Liu, Shuangyue; Sun, Zhiyong; Cui, Han; Xu, Xuekai; Qi, Jia; Guo, Mengqi; Lu, Yueming; Qiao, Yaojun

doi:10.1364/oe.27.025708

Cited by 33 publications

(8 citation statements)

References 15 publications

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“…Driven by the growing demands for bandwidth-consuming applications (e.g., cloud computing, Internet of Things (IOT) and artificial intelligence-intensive services and so on), higher-speed access network would be required for meeting the increasing data traffic. Compared with other mainstream technology solutions applied in access network, intensity-modulation and direct-detection (IM/DD) with low cost and power consumption has obtained a lot of attentions [1][2][3]. Usually, the single-end photodetector which has been applied to detect intensity information is considered as the key receiver component of IM/DD systems.…”

Section: Introductionmentioning

confidence: 99%

56-Gbit/s PAM-4 Optical Signal Transmission Over 100-km SMF Enabled by TCNN Regression Model

et al. 2021

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Due to the interaction between chromatic dispersion (CD) and direct detection, the CD induced power-fading effect has been considered as the key point to limit transmission rate and distance in intensity modulation direct-detection (IM/DD) systems. Besides, the performance of the IM/DD systems will be further affected by the bandwidth limitation and nonlinearity effect. In this paper, we propose a low complexity nonlinear equalizer (NLE) based on temporal convolutional neural network (TCNN) regression model which combines dilated convolutions with residual connections. Then, the performance of our proposed equalizer is experimentally demonstrated in 56-Gbit/s 4-level pulse amplitude modulation (PAM4) intensity modulation direct-detection system. The results show that the receiver sensitivity with the help of our TCNN equalizer can be improved about 1.5 dB and 3.5 dB compared to 2D-CNN and 1D-CNN equalizer under 70-km single mode fiber (SMF) transmission. Furthermore, the proposed equalizer can extend maximum transmission distance to 100 km at bit error rate threshold of 3.8×10 -3 .

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Section: Introductionmentioning

confidence: 99%

56-Gbit/s PAM-4 Optical Signal Transmission Over 100-km SMF Enabled by TCNN Regression Model

et al. 2021

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“…Following these considerations, it is relevant to identify the CD‐induced operating bandwidth of single‐mode optical fibers, which is defined by the effect of power fading in IM‐DD optical systems [ 25 ] and is indeed dependent on the transmission wavelength. Other solutions for the mitigation of CD effects rely on either the use of complex digital signal processing at the receiver [ 26 ] or the manipulation of the signal at the transmitter using means like in‐phase‐quadrature‐phase‐modulated complex single‐sideband formats (IQ‐DD) [ 27 ] or Tomlinson–Harashima precoding (THP), [ 28,29 ] in order to extend the reach. However, the IQ‐DD approach significantly increases the expense of both electrical and optical components at the transmitter and also suffers from a high carrier‐to‐signal power ratio restriction, whilst the THP‐based IM‐DD scheme exhibits a much higher computational complexity and degraded transmission performance in wavelength‐division multiplexing (WDM) transmission and adds additional processing latency.…”

Section: Introductionmentioning

confidence: 99%

Low‐Latency WDM Intensity‐Modulation and Direct‐Detection Transmission Over >100 km Distances in a Hollow Core Fiber

Hong

Bottrill

Bradley

et al. 2021

Laser & Photonics Reviews

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The pervasive digital economy, fueled by developments in datacenter networking and cloud/edge computing, relies ever increasingly on the implementation of short-to metro-range high-capacity, low-latency optical communication links. In this paper, it is demonstrated that the low spectrally flat chromatic dispersion and ultralow nonlinearity possible in hollow-core fibers (HCFs) compared to conventional solid-core fibers offer significant potential for the transmission of intensity-modulation and direct-detection (IM-DD) signals over 100-km-scale distances. Specifically, the longest HCF-only IM-DD wavelength-division multiplexed (WDM) C-band transmission experiments (>100km) without chromatic dispersion compensation to date are reported, achieving reach improvements of approximately 5 times and 2 times compared to using standard single-mode fiber and non-zero dispersion-shifted fiber, respectively, in the same experimental recirculating loop set-up. For >100-km transmission, a significant >150-µs latency reduction can be obtained using HCF. These results, in combination with recent progress in loss reduction in HCFs, indicate that such fibers present a promising route to the realization of simple, cost-effective, high-capacity, ultra-low-latency IM-DD WDM transmission links with the potential to revolutionize optical networks in the years to come.

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“…Therefore, advanced digital signal processing (DSP) techniques without changing the traditional structure of IM/DD optical systems are researched to alleviate CD-caused impairments. Popular DSP techniques include Tomlinson-Harashima precoding (THP) [21], decision feedback equalizer (DFE) [22], and maximum likelihood sequence estimation (MLSE) [23]. Our previous work proposed an adaptive channel-matched detection (ACMD) for dispersion-uncompensated links [24].…”

Section: Introductionmentioning

confidence: 99%

Fixed-State Log-MAP Detection for Intensity-Modulation and Direct-Detection Systems Over Dispersion-Uncompensated Links

et al. 2021

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In this paper, an optimized detection based on log-maximum a posteriori estimation with the fixed number of surviving states (fixed-state Log-MAP) is proposed cooperating with equalizers to deal with spectral distortions for intensity-modulation and direct-detection (IM/DD) optical transmission systems. The equalizers compensate the spectral distortions caused by limited bandwidth and chromatic dispersion, and the optimized detection decodes the useful bits from equalized symbols with severe colored in-band noise. To more accurately extract the bits, the optimized detection with larger memory length is required. However, the classical optimized detection based on maximum likelihood-sequence estimation (MLSE) requires exponential-growing computational complexity and storage space with the increase of memory length. The fixed-state Log-MAP detection can decrease the computational complexity and storage space from the exponential order to linear order. Therefore, the fixed-state Log-MAP detection can support larger memory length to more accurately extract bits with less logic gate resources and storage resources compared to MLSE. We experimentally verified the fixed-state Log-MAP detection in a C-band 64Gbit/s IM/DD on-off keying optical system over a 100km dispersion-uncompensated link. The fixed-state Log-MAP detection not only improves the receiver sensitivity of 2dB, but also reduces the computational complexity and storage space by three orders of magnitude.

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C-band 56-Gb/s PAM4 transmission over 80-km SSMF with electrical equalization at receiver

Cited by 33 publications

References 15 publications

56-Gbit/s PAM-4 Optical Signal Transmission Over 100-km SMF Enabled by TCNN Regression Model

56-Gbit/s PAM-4 Optical Signal Transmission Over 100-km SMF Enabled by TCNN Regression Model

Low‐Latency WDM Intensity‐Modulation and Direct‐Detection Transmission Over >100 km Distances in a Hollow Core Fiber

Fixed-State Log-MAP Detection for Intensity-Modulation and Direct-Detection Systems Over Dispersion-Uncompensated Links

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