The Experts below are selected from a list of 1110 Experts worldwide ranked by ideXlab platform
Weisheng Hu - One of the best experts on this subject based on the ideXlab platform.
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SVM-Modified-FFE Enabled Chirp Management for 10G DML-Based 50Gb/s/λ PAM4 IM-DD PON
Optical Fiber Communication Conference (OFC) 2019, 2019Co-Authors: Xin Miao, Meihua Bi, Jiasheng Yu, Longsheng Li, Weisheng HuAbstract:We propose a novel machine learning based equalization algorithm for bandwidth-limited IM-DD PON in C-band. 50Gb/s/λ. PAM4 transmission is demonstrated over 20km SSMF using a 10G-class transmitter with 21dB Loss Budget without amplification.
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56 Gbps IM/DD PON based on 10G-Class Optical Devices with 29 dB Loss Budget Enabled by Machine Learning
2018 Optical Fiber Communications Conference and Exposition (OFC), 2018Co-Authors: Peixuan Li, Lilin Yi, Weisheng HuAbstract:We demonstrate 56 Gbps PAM4 PON transmission over 25 km SSMF using 10G-class DML and APD with 6 GHz 3-dB bandwidth. 29 dB Loss Budget is achieved by a novel equalization technique based on convolutional neural network.
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Upstream dispersion management supporting 100 km differential reach in TWDM-PON.
Optics Express, 2015Co-Authors: Lilin Yi, Zhengxuan Li, Xiaodong Wang, Jingqing Huang, Weisheng HuAbstract:An optical dispersion compensator (ODC) with negative dispersion value in optical line terminal (OLT) is proposed to manage the chromatic dispersion of 10 Gb/s upstream directly-modulated signals from users with 100 km differential distances, achieving a maximal 51.9 dB Loss Budget thanks to the positive chirp of the directly-modulated signals and the characteristics of access networks that lower Loss Budget is required for the users at shorter transmission distance. The optimal dispersion value of the ODC is determined by the maximal distance of the users and the objective is to guarantee the Loss Budget monotonically improved with the increase of reach, therefore supporting differential reach. Experimental results show that it is a potential solution for practical implementation of long-reach and high splitting-ratio time and wavelength division multiplexed passive optical network (TWDM-PON).
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symmetric 40 gb s twdm pon with 51 db Loss Budget by using a single soa as preamplifier booster and format converter in onu
Optics Express, 2014Co-Authors: Zhengxuan Li, Lilin Yi, Weisheng HuAbstract:In this paper, we propose to use a semiconductor optical amplifier (SOA) in the optical network unit (ONU) to improve the Loss Budget in time and wavelength division multiplexed-passive optical network (TWDM-PON) systems. The SOA boosts the upstream signal to increase the output power of the electro-absorption modulated laser (EML) and simultaneously pre-amplifies the downstream signal for sensitivity improvement. The penalty caused by cross gain modulation (XGM) effect is negligible due to the low extinction ratio (ER) of upstream signal and the large wavelength difference between upstream and downstream links. In order to achieve a higher output power, the SOA is driven into its saturation region, where the self-phase modulation (SPM) effect converts the intensity into phase information and realizes on-off-keying (OOK) to phase-shifted-keying (PSK) format conversion. In this way, the pattern effect is eliminated, which releases the requirement of gain-clamping on SOA. To further improve the Loss Budget of upstream link, an Erbium doped fiber amplifier (EDFA) is used in the optical line terminal (OLT) to pre-amplify the received signal. For the downstream direction, directly modulated laser (DML) is used as the laser source. Taking advantage of its carrier-less characteristic, directly modulated signal shows high tolerance to fiber nonlinearity, which could support a downstream launch power as high as + 16 dBm per channel. In addition, the signal is pre-amplified by the SOA in ONU before being detected, so the sensitivity limitation for downstream link is also removed. As a result, a truly passive symmetric 40-Gb/s TWDM-PON was demonstrated, achieving a link Loss Budget of 51 dB.
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symmetric 40 gb s 100 km passive reach twdm pon with 53 db Loss Budget
Journal of Lightwave Technology, 2014Co-Authors: Zhengxuan Li, Lilin Yi, Meihua Bi, Hao He, Shilin Xiao, Weisheng HuAbstract:A truly passive long-reach, symmetric 40-Gb/s time and wavelength division multiplexed passive optical network (TWDM-PON) with a high Loss Budget is demonstrated, using direct modulation and direct detection in both upstream and downstream directions. Thermally tuned directly modulated lasers (DMLs) are employed to serve as both upstream and downstream transmitters, not only owing to their low cost, but also, as a carrier-less modulation method, where the signal generated by direct modulation is demonstrated to be more robust to high launch power induced fiber nonlinearities compared with external intensity modulation formats with strong carrier power. Therefore, DML is suitable for applying in TWDM-PON to achieve a high Loss Budget. Moreover, the frequency chirp induced dispersion of directly-modulated signal is managed thanks to the combination of optical spectral reshaping and dispersion supported transmission effects, which makes it possible for the directly-modulated signal to reach a distance of 100 km and still with a good quality. As a result, a system Loss Budget of 53 dB is achieved, supporting more than 1000 users with 100-km purely passive reach, which is the first demonstration of high Loss Budget, long reach TWDM-PONs to our best knowledge.
Jyehong Chen - One of the best experts on this subject based on the ideXlab platform.
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67.6% Improvement in data rate employing partial transmit sequence for PAPR reduction and volterra filtering in an OFDM long-reach PON
2017 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR), 2020Co-Authors: Chun-yen Chuang, Hong-minh Nguyen, Young-kai Chen, Jyehong ChenAbstract:We applied partial transmit sequence and Volterra filtering to achieve 67.6% improvement in capacity in a high-launch-power 60-km OFDM LR-PON. 61-Gbps capacity and 30-dB Loss Budget were realized to support 64 ONUs with 0.95 Gbps/ONU.
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frequency and time domain nonlinear distortion compensation in high speed ofdm imdd lr pon with high Loss Budget
Optics Express, 2017Co-Authors: Hsing-yu Chen, Li-wei Chen, I-cheng Lu, Jyehong ChenAbstract:This study compared two nonlinear distortion compensation techniques, SSII cancellation (in the frequency domain) and Volterra filtering (in the time domain), in a >50-Gbps/λ OFDM-IMDD LR-PON. Experiment results for SNR, BER, and data rate (based on a bit-loading algorithm) revealed that the performance of frequency-domain SSII cancellation is unaffected by power fading; however, it depends heavily on the precision of the mathematical model. Conversely, although time-domain Volterra filtering is affected by the faded waveform, adaptive-weighting provides flexibility in dealing with mixed nonlinear distortion, particularly that associated with the interplay between fiber dispersion and fiber nonlinearity. 4-channel WDM-OFDM and 3rd-order Volterra filtering were used to demonstrate the feasibility of the proposed scheme in a 200-Gbps IMDD system. Based on 10-GHz EAM and PIN, we achieved 200-Gbps transmission over a distance of 60 km with a Loss Budget of >30 dB, while providing support for 128 ONUs at >1.6 Gbps/ONU without the need for an inline amplifier or pre-amplifier.
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High-Capacity Carrierless Amplitude and Phase Modulation for WDM Long-Reach PON Featuring High Loss Budget
Journal of Lightwave Technology, 2017Co-Authors: Chia Chien Wei, Che-yu Lin, Kuan-zhou Chen, Wan-jou Huang, Li-wei Chen, Jyehong ChenAbstract:This paper utilizes spectrally efficient carrierless amplitude and phase (CAP) modulation and four wavelength division multiplexing channels in formulation of a high-capacity transmission system. The dispersion and Loss associated with a single-mode fiber of 60 km can result in severe power fading and insufficient Loss Budget, respectively. This study employed high launch power to overcome these issues and thereby achieve long-reach transmission without the need for dispersion compensation or an optical inline amplifier. Modified Volterra filtering is used to deal with the linear and nonlinear distortions within the system. This allowed for the inclusion of cost-effective 10-GHz-class electro-absorption modulators and p-i-n detectors for 4-λ 224-Gb/s 32-CAP 60-km transmission with a Loss Budget of 26 dB/channel. The proposed system provides support for the 64 optical network units (ONUs) with downstream transmission of > 3 Gb/s/ONU for future longreach passive optical networks. We also examined the transmission performance of each channel under various launch powers. Increasing launch power from 9 to 18 dBm/channel increases the Loss Budget by 9 dB and expands the total capacity by 42%.
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A high Loss Budget 400-Gbps WDM-OFDM long-reach PON over 60 km transmission by 10G-class EAM and PIN without in-line or pre-amplifier
2017 Optical Fiber Communications Conference and Exhibition (OFC), 2017Co-Authors: Chun-yen Chuang, Jun-jie Liu, Hsin-yu Wu, Hong-minh Nguyen, Shao-yu Lu, Chia Chien Wei, Chun-wei Wang, Young-kai Chen, Jyehong ChenAbstract:A 400-Gbps WDM-OFDM LR-PON over 60-km SMF is demonstrated with a 10G-class EAM and PIN. 25-dB Loss Budget is realized without in-line or pre-amplifier to economically support 128 ONUs with 3.1-Gbps/ONU capacity.
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52.5% Data rate improvement by employing Volterra filtering and exponential companding in a high Loss Budget and high-capacity OFDM long-reach PON
2016 Optical Fiber Communications Conference and Exhibition (OFC), 2016Co-Authors: H Y Chen, Jun-jie Liu, Hsin-yu Wu, Chia Chien Wei, Chia Wei Hsu, Chun Yen Chang, Jyehong ChenAbstract:An exponential companding method cooperating with Volterra filtering is proposed and demonstrated to substantially improve data rate by 52.5% in a 53.3-Gbps 60-km OFDM LR-PON with 30-dB Loss Budget based on 10-GHz EAM and PIN.
Zhengxuan Li - One of the best experts on this subject based on the ideXlab platform.
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Requirements on resolution and sampling jitter of ADC in 10G-class optics and MLSD based NG-EPON
Optical Fiber Communication Conference, 2017Co-Authors: Zhengxuan Li, Yingchun Li, Jian Chen, Yingxiong Song, Tingting Xu, Min WangAbstract:The impact of sampling jitter and resolution of ADC on the performance of MLSD-based NG-EPON is analyzed. 30-dB Loss Budget is achieved in 25-Gb/s/λ applications using 25-Gb/s, 3-bit ADC with ±2.5-ps timing jitter tolerance.
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Upstream dispersion management supporting 100 km differential reach in TWDM-PON.
Optics Express, 2015Co-Authors: Lilin Yi, Zhengxuan Li, Xiaodong Wang, Jingqing Huang, Weisheng HuAbstract:An optical dispersion compensator (ODC) with negative dispersion value in optical line terminal (OLT) is proposed to manage the chromatic dispersion of 10 Gb/s upstream directly-modulated signals from users with 100 km differential distances, achieving a maximal 51.9 dB Loss Budget thanks to the positive chirp of the directly-modulated signals and the characteristics of access networks that lower Loss Budget is required for the users at shorter transmission distance. The optimal dispersion value of the ODC is determined by the maximal distance of the users and the objective is to guarantee the Loss Budget monotonically improved with the increase of reach, therefore supporting differential reach. Experimental results show that it is a potential solution for practical implementation of long-reach and high splitting-ratio time and wavelength division multiplexed passive optical network (TWDM-PON).
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symmetric 40 gb s twdm pon with 51 db Loss Budget by using a single soa as preamplifier booster and format converter in onu
Optics Express, 2014Co-Authors: Zhengxuan Li, Lilin Yi, Weisheng HuAbstract:In this paper, we propose to use a semiconductor optical amplifier (SOA) in the optical network unit (ONU) to improve the Loss Budget in time and wavelength division multiplexed-passive optical network (TWDM-PON) systems. The SOA boosts the upstream signal to increase the output power of the electro-absorption modulated laser (EML) and simultaneously pre-amplifies the downstream signal for sensitivity improvement. The penalty caused by cross gain modulation (XGM) effect is negligible due to the low extinction ratio (ER) of upstream signal and the large wavelength difference between upstream and downstream links. In order to achieve a higher output power, the SOA is driven into its saturation region, where the self-phase modulation (SPM) effect converts the intensity into phase information and realizes on-off-keying (OOK) to phase-shifted-keying (PSK) format conversion. In this way, the pattern effect is eliminated, which releases the requirement of gain-clamping on SOA. To further improve the Loss Budget of upstream link, an Erbium doped fiber amplifier (EDFA) is used in the optical line terminal (OLT) to pre-amplify the received signal. For the downstream direction, directly modulated laser (DML) is used as the laser source. Taking advantage of its carrier-less characteristic, directly modulated signal shows high tolerance to fiber nonlinearity, which could support a downstream launch power as high as + 16 dBm per channel. In addition, the signal is pre-amplified by the SOA in ONU before being detected, so the sensitivity limitation for downstream link is also removed. As a result, a truly passive symmetric 40-Gb/s TWDM-PON was demonstrated, achieving a link Loss Budget of 51 dB.
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symmetric 40 gb s 100 km passive reach twdm pon with 53 db Loss Budget
Journal of Lightwave Technology, 2014Co-Authors: Zhengxuan Li, Lilin Yi, Meihua Bi, Hao He, Shilin Xiao, Weisheng HuAbstract:A truly passive long-reach, symmetric 40-Gb/s time and wavelength division multiplexed passive optical network (TWDM-PON) with a high Loss Budget is demonstrated, using direct modulation and direct detection in both upstream and downstream directions. Thermally tuned directly modulated lasers (DMLs) are employed to serve as both upstream and downstream transmitters, not only owing to their low cost, but also, as a carrier-less modulation method, where the signal generated by direct modulation is demonstrated to be more robust to high launch power induced fiber nonlinearities compared with external intensity modulation formats with strong carrier power. Therefore, DML is suitable for applying in TWDM-PON to achieve a high Loss Budget. Moreover, the frequency chirp induced dispersion of directly-modulated signal is managed thanks to the combination of optical spectral reshaping and dispersion supported transmission effects, which makes it possible for the directly-modulated signal to reach a distance of 100 km and still with a good quality. As a result, a system Loss Budget of 53 dB is achieved, supporting more than 1000 users with 100-km purely passive reach, which is the first demonstration of high Loss Budget, long reach TWDM-PONs to our best knowledge.
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Comparison of downstream transmitters for high Loss Budget of long-reach 10G-PON
OFC 2014, 2014Co-Authors: Zhengxuan Li, Lilin Yi, Weisheng HuAbstract:A comparison among different transmitters was made by evaluating the sensitivities under various launch powers and reaches. Experimental results indicate that directly-modulated laser based transmitters provide higher Loss Budget for long reach 10G-PON.
Lilin Yi - One of the best experts on this subject based on the ideXlab platform.
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56 Gbps IM/DD PON based on 10G-Class Optical Devices with 29 dB Loss Budget Enabled by Machine Learning
2018 Optical Fiber Communications Conference and Exposition (OFC), 2018Co-Authors: Peixuan Li, Lilin Yi, Weisheng HuAbstract:We demonstrate 56 Gbps PAM4 PON transmission over 25 km SSMF using 10G-class DML and APD with 6 GHz 3-dB bandwidth. 29 dB Loss Budget is achieved by a novel equalization technique based on convolutional neural network.
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Novel burst-mode edfa using backward laser injection for 40-Gb/s TWDM-PON
2015 Opto-Electronics and Communications Conference (OECC), 2015Co-Authors: Yonghao Xu, Xiaodong Wang, Lilin YiAbstract:In this paper, we propose a burst-mode EDFA for 40-Gb/s TWDM-PON supporting 100-km reach with 50-dB Loss Budget. Backward laser injection using a low-cost Fabry-Perot laser suppresses the burst surge whilst achieving low noise figure.
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Upstream dispersion management supporting 100 km differential reach in TWDM-PON.
Optics Express, 2015Co-Authors: Lilin Yi, Zhengxuan Li, Xiaodong Wang, Jingqing Huang, Weisheng HuAbstract:An optical dispersion compensator (ODC) with negative dispersion value in optical line terminal (OLT) is proposed to manage the chromatic dispersion of 10 Gb/s upstream directly-modulated signals from users with 100 km differential distances, achieving a maximal 51.9 dB Loss Budget thanks to the positive chirp of the directly-modulated signals and the characteristics of access networks that lower Loss Budget is required for the users at shorter transmission distance. The optimal dispersion value of the ODC is determined by the maximal distance of the users and the objective is to guarantee the Loss Budget monotonically improved with the increase of reach, therefore supporting differential reach. Experimental results show that it is a potential solution for practical implementation of long-reach and high splitting-ratio time and wavelength division multiplexed passive optical network (TWDM-PON).
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symmetric 40 gb s twdm pon with 51 db Loss Budget by using a single soa as preamplifier booster and format converter in onu
Optics Express, 2014Co-Authors: Zhengxuan Li, Lilin Yi, Weisheng HuAbstract:In this paper, we propose to use a semiconductor optical amplifier (SOA) in the optical network unit (ONU) to improve the Loss Budget in time and wavelength division multiplexed-passive optical network (TWDM-PON) systems. The SOA boosts the upstream signal to increase the output power of the electro-absorption modulated laser (EML) and simultaneously pre-amplifies the downstream signal for sensitivity improvement. The penalty caused by cross gain modulation (XGM) effect is negligible due to the low extinction ratio (ER) of upstream signal and the large wavelength difference between upstream and downstream links. In order to achieve a higher output power, the SOA is driven into its saturation region, where the self-phase modulation (SPM) effect converts the intensity into phase information and realizes on-off-keying (OOK) to phase-shifted-keying (PSK) format conversion. In this way, the pattern effect is eliminated, which releases the requirement of gain-clamping on SOA. To further improve the Loss Budget of upstream link, an Erbium doped fiber amplifier (EDFA) is used in the optical line terminal (OLT) to pre-amplify the received signal. For the downstream direction, directly modulated laser (DML) is used as the laser source. Taking advantage of its carrier-less characteristic, directly modulated signal shows high tolerance to fiber nonlinearity, which could support a downstream launch power as high as + 16 dBm per channel. In addition, the signal is pre-amplified by the SOA in ONU before being detected, so the sensitivity limitation for downstream link is also removed. As a result, a truly passive symmetric 40-Gb/s TWDM-PON was demonstrated, achieving a link Loss Budget of 51 dB.
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symmetric 40 gb s 100 km passive reach twdm pon with 53 db Loss Budget
Journal of Lightwave Technology, 2014Co-Authors: Zhengxuan Li, Lilin Yi, Meihua Bi, Hao He, Shilin Xiao, Weisheng HuAbstract:A truly passive long-reach, symmetric 40-Gb/s time and wavelength division multiplexed passive optical network (TWDM-PON) with a high Loss Budget is demonstrated, using direct modulation and direct detection in both upstream and downstream directions. Thermally tuned directly modulated lasers (DMLs) are employed to serve as both upstream and downstream transmitters, not only owing to their low cost, but also, as a carrier-less modulation method, where the signal generated by direct modulation is demonstrated to be more robust to high launch power induced fiber nonlinearities compared with external intensity modulation formats with strong carrier power. Therefore, DML is suitable for applying in TWDM-PON to achieve a high Loss Budget. Moreover, the frequency chirp induced dispersion of directly-modulated signal is managed thanks to the combination of optical spectral reshaping and dispersion supported transmission effects, which makes it possible for the directly-modulated signal to reach a distance of 100 km and still with a good quality. As a result, a system Loss Budget of 53 dB is achieved, supporting more than 1000 users with 100-km purely passive reach, which is the first demonstration of high Loss Budget, long reach TWDM-PONs to our best knowledge.
Jianjun Yu - One of the best experts on this subject based on the ideXlab platform.
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Symmetrical 50-Gb/s/λ PAM-4 TDM-PON at O-Band Supporting 26 dB+ Loss Budget using Low-Bandwidth Optics and Semiconductor Optical Amplifier
2020 Optical Fiber Communications Conference and Exhibition (OFC), 2020Co-Authors: Jiao Zhang, Kaihui Wang, Li Zhao, Wen Zhou, Jiangnan Xiao, Jianjun YuAbstract:We experimentally demonstrated a symmetrical 50-Gb/s/λ PAM-4 TDM-PON in O-band to support over 26 dB link Loss Budget, with the using of simple DSP and SOA. The performances of DSP and dispersion tolerance are studied.
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symmetrical 50 gb s λ pam 4 tdm pon at o band supporting 26 db Loss Budget using low bandwidth optics and semiconductor optical amplifier
Optical Fiber Communication Conference, 2020Co-Authors: Jiao Zhang, Kaihui Wang, Li Zhao, Wen Zhou, Jiangnan Xiao, Jianjun YuAbstract:We experimentally demonstrated a symmetrical 50-Gb/s/λ PAM-4 TDM-PON in O-band to support over 26 dB link Loss Budget, with the using of simple DSP and SOA. The performances of DSP and dispersion tolerance are studied.
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Symmetrical 50-Gb/s/λ PAM-4 TDM-PON in O-band with DSP and Semiconductor Optical Amplifier Supporting PR-30 Link Loss Budget
2018 Optical Fiber Communications Conference and Exposition (OFC), 2018Co-Authors: Junwen Zhang, Jianjun Yu, Zhijuan Tu, Bo Yang, Wei Yang, Xingang HuangAbstract:We experimentally investigate the symmetrical 50-Gb/sλ PAM-4 TDM-PON solutions in the O-band to support the PR-30 link Loss Budget, with the using of DSP and SOA. The performances of DSP and SOA setup are studied.
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symmetrical 50 gb s λ pam 4 tdm pon in o band with dsp and semiconductor optical amplifier supporting pr 30 link Loss Budget
Optical Fiber Communication Conference, 2018Co-Authors: Junwen Zhang, Jianjun Yu, Zhijuan Tu, Bo Yang, Wei Yang, Xingang HuangAbstract:We experimentally investigate the symmetrical 50-Gb/sλ PAM-4 TDM-PON solutions in the O-band to support the PR-30 link Loss Budget, with the using of DSP and SOA. The performances of DSP and SOA setup are studied.
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A bandwidth-efficient coherent ultra-dense WDM-PON based on Nyquist independent-sideband modulation
2014 The European Conference on Optical Communication (ECOC), 2014Co-Authors: Ze Dong, Junwen Zhang, Jianjun Yu, Hung-chang Chien, Lin Cheng, Gee-kung ChangAbstract:We firstly demonstrate a coherent Ultra-Dense WDM-PON with much enhanced spectral and bandwidth efficiency using Nyquist independent sideband modulation. A capacity of 1200 × 10-Gb/s users at 5.628-bits/s/Hz spectral efficiency is demonstrated with an ODN Loss Budget of 35.5 dB.
