The Experts below are selected from a list of 1395 Experts worldwide ranked by ideXlab platform
David V. Plant - One of the best experts on this subject based on the ideXlab platform.
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single wavelength twin ssb Direct Detection System based on kramers kronig receiver and time interleaved ofdm frame
Optics Communications, 2018Co-Authors: Thang M. Hoang, Qunbi Zhuge, Mohammed Sowailem, Mohamed Morsyosman, Fangyuan Zhang, Yan Li, Jian Wu, David V. PlantAbstract:Abstract In this paper, we propose a spectrally efficient and cost-effective twin-SSB OFDM System based on Kramers–Kronig optical phase reconstruction and time-interleaved frame (TIF). C-band transmission over 80 km SSMF with a net bit rate of 88.5 Gb/s using 40 GSa/s DACs is experimentally demonstrated with a BER threshold of 3.8e−3. Two optical filters are employed to separate the two sidebands at the receiver. The imperfection of filter transfer function introduces crosstalk between them, which can be mitigated by the TIF. The impact of optical filter parameters, including roll-off, bandwidth and center frequency shift, are studied and analyzed in detail by simulation. We show that the roll-off determines the required size of TIF, and the optical fiber bandwidth leads to tradeoff between carrier-to-signal power ratio and spectral efficiency. Finally, the optimization and tolerance range of the filter center frequency shift are numerically evaluated.
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Single Wavelength 480 Gb/s Direct Detection Transmission Over 80 km SSMF Enabled by Stokes Vector Receiver and Reduced-Complexity SSBI Cancellation
2018 Optical Fiber Communications Conference and Exposition (OFC), 2018Co-Authors: Thang M. Hoang, Qunbi Zhuge, Zhenping Xing, Mohammed Sowailem, Mohamed Morsy-osman, David V. PlantAbstract:We experimentally demonstrate a 4-dimensional modulation Direct Detection System based on Stokes vector receiver and a novel reduced-complexity SSBI cancellation algorithm for signal linearization. A 480 Gb/s data rate over 80 km SSMF is achieved.
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OFC - Single Wavelength 480 Gb/s Direct Detection Transmission Over 80 km SSMF Enabled by Stokes Vector Receiver and Reduced-Complexity SSBI Cancellation
Optical Fiber Communication Conference, 2018Co-Authors: Thang M. Hoang, Qunbi Zhuge, Zhenping Xing, Mohammed Sowailem, Mohamed Morsy-osman, David V. PlantAbstract:We experimentally demonstrate a 4-dimensional modulation Direct Detection System based on Stokes vector receiver and a novel reduced-complexity SSBI cancellation algorithm for signal linearization. A 480 Gb/s data rate over 80 km SSMF is achieved.
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impact of chromatic dispersion compensation in single carrier two dimensional stokes vector Direct Detection System
IEEE Photonics Journal, 2017Co-Authors: Mohammed Sowailem, Thang M. Hoang, Mathieu Chagnon, Stephane Paquet, Carl Paquet, Ian Woods, Mohamed Morsyosman, Odile Liboironladouceur, David V. PlantAbstract:We experimentally demonstrate, aided with mathematical analysis, two methods for chromatic dispersion (CD) compensation for two-dimensional Stokes vector Direct Detection (2D-SV-DD) System. Results show that the better CD compensation method is dependent on transmission distance and operating symbol rate relative to the digital-to-analog converter (DAC) sampling rate. When 84 GBd 16 QAM signal is generated using an 84 GSps DAC, the bit error rate (BER) after 640 km propagation is $\sim1.67\times 10^{-2}$ and $\sim2\times 10^{-2}$ using CD post- and precompensation, respectively. When 64 GBd 16 QAM signal is generated at the same DAC sampling rate, the BER at 960 km is $\sim1.61\times 10^{-2}$ and $\sim9.8\times 10^{-3}$ using CD post- and precompensation, respectively. In addition, our findings reveal that CD precompensation allows for transmission distances greater than 1000 km at which CD postcompensation is no longer viable due to the required training. Finally, enabled by CD precompensation, we report the highest capacity-times-distance products of 591 360 (Gb/s) $\cdot$ km and 614 400 (Gb/s) $\cdot$ km in 2D-SV-DD System using QPSK modulation format and symbol rates of 84 and 64 GBd, respectively. Also, we can achieve 300G transmission for distances below 320 km using 84 GBd 16 QAM signal with BER below hard decision forward error correcting threshold of $\sim3.8\times 10^{-3}$ .
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Impact of Chromatic Dispersion Compensation in Single Carrier Two-Dimensional Stokes Vector Direct Detection System
IEEE Photonics Journal, 2017Co-Authors: Mohammed Sowailem, Thang M. Hoang, Mohamed Morsy-osman, Mathieu Chagnon, Stephane Paquet, Carl Paquet, Ian Woods, Odile Liboiron-ladouceur, David V. PlantAbstract:We experimentally demonstrate, aided with mathematical analysis, two methods for chromatic dispersion (CD) compensation for two-dimensional Stokes vector Direct Detection (2D-SV-DD) System. Results show that the better CD compensation method is dependent on transmission distance and operating symbol rate relative to the digital-toanalog converter (DAC) sampling rate. When 84 GBd 16 QAM signal is generated using an 84 GSps DAC, the bit error rate (BER) after 640 km propagation is ~1.67 × 10-2 and ~2 × 10-2 using CD postand precompensation, respectively. When 64 GBd 16 QAM signal is generated at the same DAC sampling rate, the BER at 960 km is ~1.61 × 10-2 and ~9.8 × 10-3 using CD postand precompensation, respectively. In addition, our findings reveal that CD precompensation allows for transmission distances greater than 1000 km at which CD postcompensation is no longer viable due to the required training. Finally, enabled by CD precompensation, we report the highest capacity-times-distance products of 591 360 (Gb/s)·km and 614 400 (Gb/s)·km in 2D-SV-DD System using QPSK modulation format and symbol rates of 84 and 64 GBd, respectively. Also, we can achieve 300G transmission for distances below 320 km using 84 GBd 16 QAM signal with BER below hard decision forward error correcting threshold of ~3.8 × 10-3.
J. M. Tang - One of the best experts on this subject based on the ideXlab platform.
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experimental demonstration of a record high 11 25gb s real time optical ofdm transceiver supporting 25km smf end to end transmission in simple imdd Systems
Optics Express, 2010Co-Authors: Roger Phillip Giddings, Elias Giacoumidis, E Huguessalas, J. M. TangAbstract:The fastest ever 11.25Gb/s real-time FPGA-based optical orthogonal frequency division multiplexing (OOFDM) transceivers utilizing 64-QAM encoding/decoding and significantly improved variable power loading are experimentally demonstrated, for the first time, incorporating advanced functionalities of on-line performance monitoring, live System parameter optimization and channel estimation. Real-time end-to-end transmission of an 11.25Gb/s 64-QAM-encoded OOFDM signal with a high electrical spectral efficiency of 5.625bit/s/Hz over 25km of standard and MetroCor single-mode fibres is successfully achieved with respective power penalties of 0.3dB and −0.2dB at a BER of 1.0 × 10−3 in a Directly modulated DFB laser-based intensity modulation and Direct Detection System without in-line optical amplification and chromatic dispersion compensation. The impacts of variable power loading as well as electrical and optical components on the transmission performance of the demonstrated transceivers are experimentally explored in detail. In addition, numerical simulations also show that variable power loading is an extremely effective means of escalating System performance to its maximum potential.
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Experimental demonstration of record high 11.25Gb/s real-time end-to-end optical OFDM transceivers for PONs
2010 Future Network and Mobile Summit, 2010Co-Authors: Roger Phillip Giddings, Emilio Hugues-salas, X.q. Jin, Elias Giacoumidis, J. M. TangAbstract:The fastest ever 11.25Gb/s real-time FPGA-based optical orthogonal frequency division multiplexing (OOFDM) transceivers utilizing 64-QAM encoding/decoding and significantly improved variable power loading are experimentally demonstrated, for the first time, incorporating advanced functionalities of on-line performance monitoring, live System parameter optimization and channel estimation. Real-time end-to-end transmission of an 11.25Gb/s 64-QAM-encoded OOFDM signal with a high spectral efficiency of 5.625bit/s/Hz over 25km of standard and MetroCor™ single-mode fibres is successfully achieved with respective power penalties of 0.3dB and -0.2dB at a BER of 1.0×10-3 in a Directly modulated DFB laser-based intensity modulation and Direct Detection System without in-line optical amplification and chromatic dispersion compensation. The impacts of variable power loading as well as electrical and optical components on the transmission performance of the demonstrated transceivers are experimentally explored in detail. In addition, numerical simulations also show that variable power loading is an extremely effective means of escalating System performance to its maximum potential. Copyright © 2010 The authors.
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First experimental demonstration of 6Gb/s real-time optical OFDM transceivers incorporating channel estimation and variable power loading.
Optics express, 2009Co-Authors: Roger Phillip Giddings, X.q. Jin, J. M. TangAbstract:The fastest ever 6Gb/s real-time FPGA-based optical orthogonal frequency division multiplexing (OOFDM) transceivers utilizing channel estimation are experimentally demonstrated, for the first time, with variable power loading being incorporated to effectively compensate for the rapid System frequency response roll-off effect. The implemented transceivers are constructed entirely from off-the-shelf components and incorporate crucial functionalities of on-line performance monitoring and live optimization of key parameters including signal clipping, subcarrier power and operating conditions of Directly modulated DFB lasers (DMLs). Real-time end-to-end transmission of a 6Gb/s 16-QAM-encoded OOFDM signal over 300m OM1 multi-mode fiber with a power penalty of 0.5dB is successfully achieved in an intensity-modulation and Direct-Detection System employing a DML.
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Real-time implementation of optical OFDM transmitters and receivers for practical end-to-end optical transmission Systems
Electronics Letters, 2009Co-Authors: Roger Phillip Giddings, X.l. Yang, J. M. TangAbstract:Real-time optical OFDM transceivers are successfully demonstrated for the first time, which support 1.5 Gbit/s transmission over 500 m 62.5/125 m multimode fibres in an intensity-modulation and Direct-Detection System involving a Directly modulated DFB laser. The implemented transceivers only use standard commercially available components.
Xingwen Yi - One of the best experts on this subject based on the ideXlab platform.
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Non-orthogonal Discrete Multi-tone With Low Decoding Complexity Utilizing Symmetric Compression in Time–Frequency Space
IEEE Photonics Journal, 2018Co-Authors: Zibin Li, Xingwen Yi, Fan Li, Zhaohui LiAbstract:Utilizing symmetric compression in time-frequency space, we can eliminate the crosstalk between real and imaginary components, and thus simplify the decoding complexity significantly in a non-orthogonal discrete multi-tone transmission System. The experiments are also demonstrated for an intensity-modulated Direct Detection System with the decoding complexity decreased to 1/4 for 13.8 Gbit/s QPSK and 1/8 for 27.6 Gbit/s 16-QAM with 1310 nm transmission over 40 km SMF.
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sparse volterra model based on optical single side band npam 4 Direct Detection System
Optical Fiber Technology, 2018Co-Authors: Hao Ying, Xingwen Yi, Jing Zhang, Yang SongAbstract:Abstract Signal-to-signal beating interference (SSBI) is one of the main drawbacks in Direct-Detection based optical transmission Systems. Volterra filter is a common equalization method to mitigate the nonlinear distortion. However, the computational complexity may be unacceptable as the transmission capacity increases. In this paper, we propose a sparse Volterra model combining the feed forward equalization (FFE) and higher order terms of a modified Volterra filter with Schmidt orthogonal searching to mitigate the linear and nonlinear interference and reduce the complexity significantly in an optical single-side band (SSB) Nyquist pulse-shaped four-level pulse amplitude (NPAM-4) System. The experimental results show that the sparse Volterra filter and full Volterra filter have comparable performance, but the former only needs half kernels of the latter.
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hilbert superposition and modified signal to signal beating interference cancellation for single side band optical npam 4 Direct Detection System
Optics Express, 2017Co-Authors: Jing Zhang, Xingwen Yi, Xiang Li, Yang Song, Bo Xu, Xinwei DuAbstract:We propose a Hilbert superposition and modified signal-to-signal beating interference (SSBI) cancellation scheme in an optical single side-band (SSB) modulation and Direct-Detection System. The optical SSB signal is generated by a relatively low-cost dual-drive Mach-Zehnder modulator (DDMZM). The two driving signals are a pair of Hilbert signals with Nyquist pulse-shaped four-level pulse amplitude modulation (NPAM-4). In addition to the transmitted baseband signal, both its Hilbert transform and the SSBI can also be detected by Direct-Detection, which introduce the interference to the transmitted signal. We use the first-stage Hilbert superposition cancellation (HSC) to cancel the unwanted Hilbert transform signal and a modified single-stage linearization filter which contains the second-stage HSC to deduct the SSBI in the receiver. We experimentally demonstrate that 40 Gb/s optical SSB NPAM-4 signal transmission over 80 km standard single mode fiber (SSMF).
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Sparse volterra model based on single side-band optical NPAM-4 Direct-Detection System
2017 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR), 2017Co-Authors: Hao Ying, Jing Zhang, Xingwen YiAbstract:Signal-to-signal beating interference (SSBl) is one of the main drawbacks of Direct-Detection based optical transmission Systems. Volterra filter is a common equalization method to mitigate the nonlinear distortion. However, the computational complexity may be unpractical as the transmission capacity increases. In this paper, we demonstrate that the sparse Volterra can reduce the complexity significantly in a single-side band optical Nyquist pulse-shaped four-level pulse amplitude (NPAM-4) System. The experimental results show that sparse Volterra and full Volterra have comparable performance, while sparse Volterra only needs half kernels of full Volterra.
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Artificial neural network for nonlinear distortion mitigation in optical SSB NPAM-4 Direct-Detection System
2017 16th International Conference on Optical Communications and Networks (ICOCN), 2017Co-Authors: Hao Ying, Xingwen Yi, Jing Zhang, Heng ZhouAbstract:We study the artificial neural network (ANN) and feed forward equalizer jointly to mitigate the inter-symbol interference (ISI) and the nonlinear distortions in the optical single-side band and Direct-Detection (DD) System. The optical SSB signal is generated by a relatively low-cost dual-drive Mach-Zehnder modulator (DDMZM). The two driving signals are a pair of Hilbert signals with Nyquist pulse-shaped four-level pulse amplitude modulation (NPAM-4). In this paper, we experimentally compare the performance of feedforward equalizer (FFE) with BP (back propagation) network combined with FFE. The experimental results show that the performance of BP network with FFE equalizer outperforms FFE equalizer, because it can efficiently mitigate the nonlinear distortions. We have experimentally demonstrated that a 40 Gb/s NPAM-4 signal transmit over 80 km standard single mode fiber (SSMF) without any inline dispersion compensation.
Roger Phillip Giddings - One of the best experts on this subject based on the ideXlab platform.
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experimental demonstration of a record high 11 25gb s real time optical ofdm transceiver supporting 25km smf end to end transmission in simple imdd Systems
Optics Express, 2010Co-Authors: Roger Phillip Giddings, Elias Giacoumidis, E Huguessalas, J. M. TangAbstract:The fastest ever 11.25Gb/s real-time FPGA-based optical orthogonal frequency division multiplexing (OOFDM) transceivers utilizing 64-QAM encoding/decoding and significantly improved variable power loading are experimentally demonstrated, for the first time, incorporating advanced functionalities of on-line performance monitoring, live System parameter optimization and channel estimation. Real-time end-to-end transmission of an 11.25Gb/s 64-QAM-encoded OOFDM signal with a high electrical spectral efficiency of 5.625bit/s/Hz over 25km of standard and MetroCor single-mode fibres is successfully achieved with respective power penalties of 0.3dB and −0.2dB at a BER of 1.0 × 10−3 in a Directly modulated DFB laser-based intensity modulation and Direct Detection System without in-line optical amplification and chromatic dispersion compensation. The impacts of variable power loading as well as electrical and optical components on the transmission performance of the demonstrated transceivers are experimentally explored in detail. In addition, numerical simulations also show that variable power loading is an extremely effective means of escalating System performance to its maximum potential.
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Experimental demonstration of record high 11.25Gb/s real-time end-to-end optical OFDM transceivers for PONs
2010 Future Network and Mobile Summit, 2010Co-Authors: Roger Phillip Giddings, Emilio Hugues-salas, X.q. Jin, Elias Giacoumidis, J. M. TangAbstract:The fastest ever 11.25Gb/s real-time FPGA-based optical orthogonal frequency division multiplexing (OOFDM) transceivers utilizing 64-QAM encoding/decoding and significantly improved variable power loading are experimentally demonstrated, for the first time, incorporating advanced functionalities of on-line performance monitoring, live System parameter optimization and channel estimation. Real-time end-to-end transmission of an 11.25Gb/s 64-QAM-encoded OOFDM signal with a high spectral efficiency of 5.625bit/s/Hz over 25km of standard and MetroCor™ single-mode fibres is successfully achieved with respective power penalties of 0.3dB and -0.2dB at a BER of 1.0×10-3 in a Directly modulated DFB laser-based intensity modulation and Direct Detection System without in-line optical amplification and chromatic dispersion compensation. The impacts of variable power loading as well as electrical and optical components on the transmission performance of the demonstrated transceivers are experimentally explored in detail. In addition, numerical simulations also show that variable power loading is an extremely effective means of escalating System performance to its maximum potential. Copyright © 2010 The authors.
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First experimental demonstration of 6Gb/s real-time optical OFDM transceivers incorporating channel estimation and variable power loading.
Optics express, 2009Co-Authors: Roger Phillip Giddings, X.q. Jin, J. M. TangAbstract:The fastest ever 6Gb/s real-time FPGA-based optical orthogonal frequency division multiplexing (OOFDM) transceivers utilizing channel estimation are experimentally demonstrated, for the first time, with variable power loading being incorporated to effectively compensate for the rapid System frequency response roll-off effect. The implemented transceivers are constructed entirely from off-the-shelf components and incorporate crucial functionalities of on-line performance monitoring and live optimization of key parameters including signal clipping, subcarrier power and operating conditions of Directly modulated DFB lasers (DMLs). Real-time end-to-end transmission of a 6Gb/s 16-QAM-encoded OOFDM signal over 300m OM1 multi-mode fiber with a power penalty of 0.5dB is successfully achieved in an intensity-modulation and Direct-Detection System employing a DML.
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Real-time implementation of optical OFDM transmitters and receivers for practical end-to-end optical transmission Systems
Electronics Letters, 2009Co-Authors: Roger Phillip Giddings, X.l. Yang, J. M. TangAbstract:Real-time optical OFDM transceivers are successfully demonstrated for the first time, which support 1.5 Gbit/s transmission over 500 m 62.5/125 m multimode fibres in an intensity-modulation and Direct-Detection System involving a Directly modulated DFB laser. The implemented transceivers only use standard commercially available components.
Zhaohui Li - One of the best experts on this subject based on the ideXlab platform.
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Dual-Drive Mach-Zehnder Modulator-Based Single Side-Band Modulation Direct Detection System Without Signal-to-Signal Beating Interference
Journal of Lightwave Technology, 2020Co-Authors: Wei Wang, Zibin Li, Fan Li, Zhaohui LiAbstract:Kramers-Kronig (KK) receiver based optical single sideband (SSB) Direct Detection (DD) Systems have been extensively investigated to cope with signal-to-signal beating interference (SSBI) for long-reach optical interconnect and 400G ZR. In this paper, we analyze the principle of dual-drive Mach-Zehnder modulator (DDMZM)-based SSB modulation due to its low cost compared with IQ modulator. We find that SSBI does not exist in back-to-back (BTB) after square-law Direct Detection, and electrical dispersion compensation (EDC) cannot be realized at the transmitter due to the nonlinear modulation of DDMZM. In our proposed scheme, Cartesian to Polar conversion (CPC) is used to achieve the linear modulation of DDMZM, then pre-EDC is achievable. Signal construction operation is applied to generate a target signal avoiding SSBI in DDMZM-based SSB modulation with Direct Detection, thus KK algorithm is not necessary both in BTB and after fiber transmission with pre-EDC, and the computation complexity of the receiver can be effectively reduced. In the simulation results of 25 GHz SSB Discrete Fourier transform spread discrete multi-tone (DFT-S DMT), the BER of our proposed scheme and conventional DDMZM scheme with optical signal-to-noise ratio (OSNR) of 26 dB are 1.2 × 10−3 and 1.7 × 10−2, respectively, after 80 km standard single mode fiber (SSMF) transmission with pre-EDC. The simulation results show that our proposed scheme is better than conventional DDMZM scheme. Although it is still inferior to the conventional IQ scheme with KK algorithm, the computation complexity of CPC is much lower than KK algorithm as it saves the numbers of adders and multipliers by the factors of 119 and 62, respectively, and reduces the memory size by a factor of 4.3.
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Non-orthogonal Discrete Multi-tone With Low Decoding Complexity Utilizing Symmetric Compression in Time–Frequency Space
IEEE Photonics Journal, 2018Co-Authors: Zibin Li, Xingwen Yi, Fan Li, Zhaohui LiAbstract:Utilizing symmetric compression in time-frequency space, we can eliminate the crosstalk between real and imaginary components, and thus simplify the decoding complexity significantly in a non-orthogonal discrete multi-tone transmission System. The experiments are also demonstrated for an intensity-modulated Direct Detection System with the decoding complexity decreased to 1/4 for 13.8 Gbit/s QPSK and 1/8 for 27.6 Gbit/s 16-QAM with 1310 nm transmission over 40 km SMF.
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single photodiode Direct Detection System of 100 gb s ofdm oqam 64qam over 80 km ssmf within a 50 ghz optical grid
Optics Express, 2014Co-Authors: Chao Li, Zhaohui Li, Haibo Li, Qi Yang, Xuebing Zhang, Rong Hu, Wei Li, Shaohua YuAbstract:We propose a novel guard-band-shared Direct-Detection (GBS-DD) scheme to improve the receiver spectrum efficiency (SE). The 100-Gb/s signal is modulated by 2 sub-bands, which are assigned onto two orthogonal polarizations. The central wavelengths of the two sub-bands are set as 10.84-GHz frequency space. The two sub-bands are then received simultaneously using a single conventional photodiode (PD) of 40-GHz bandwidth. Only one optical pilot carrier is inserted to beat with the 2 sub-bands on the two polarizations. When the 2 sub-band signal entering into the receiver, the signal-to-signal beat interference (SSBI) terms fall and overlap in the same guard band. As a consequence, the bandwidth usage of the PD is enhanced from 1/2 to 2/3. The 100-Gb/s signal is modulated using orthogonal frequency-division multiplexing based on offset quadrature-amplitude-modulation of 64-quadrature amplitude modulation (OFDM/OQAM-64QAM), and transmitted over 80-km standard single mode fiber (SSMF) within a 50-GHz optical grid. It is shown that the proposed GBS-DD scheme can be implemented by the current commercial optical/electrical devices.