The Experts below are selected from a list of 360 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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experimental demonstration of low complexity fiber chromatic dispersion mitigation for reduced Guard Interval ofdm coherent optical communication systems based on digital spectrum sub band multiplexing
Optics Express, 2015Co-Authors: Mahdi Malekiha, Moshe Nazarathy, Alex Tolmachev, Igor Tselniker, David V. PlantAbstract:Abstract: We experimentally demonstrate a novel digital signal processing (DSP) structure for reduced Guard-Interval (RGI) OFDM coherent optical systems. The proposed concept is based on digitally slicing optical channel bandwidth into multiple spectrally disjoint sub-bands which are then processed in parallel. Each low bandwidth sub-band has a smaller delay-spread compared to a full-band signal. This enables compensation of both chromatic dispersion (CD) and polarization mode dispersion using a simple timing and one-tap-per-symbol frequency domain equalizer with a small cyclic prefix overhead. In terms of the DSP architecture, this allows for a highly efficient parallelization of DSP tasks performed over the received signal samples by deploying multiple processors running at a lower clock rate. It should be noted that this parallelization is performed in the frequency domain and it allows for flexible optical transceiver schemes. In addition, the resulting optical receiver is simplified due to the removal of the CD compensation equalizer compared to conventional RGI-OFDM systems. In this paper we experimentally demonstrate digital sub-banding of optical bandwidth. We test the system performance for different modulation formats (QPSK, 16QAM and 32QAM) over various transmission distances and optical launch powers using a 1.5% CP overhead in all scenarios. We also compare the proposed RGI-OFDM architecture performance against common single carrier modulation formats. At the same total data rate and signal bandwidth both systems have similar performance and transmission reach whereas the proposed method allows for a significant reduction of computational complexity due to removal of CD pre/post compensation equalizer.
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design of enhanced channel equalizers for adaptive zero Guard Interval co ofdm systems
Optical Fiber Communication Conference, 2015Co-Authors: Wei Wang, Qunbi Zhuge, Yuliang Gao, David V. PlantAbstract:We propose the design of frequency domain block least-mean-square and recursive-least-square equalizers for adaptive zero-Guard-Interval CO-OFDM systems. Improvements in the channel estimation accuracy and channel tracking speed are experimentally and numerically demonstrated.
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decision aided sampling frequency offset compensation for reduced Guard Interval coherent optical ofdm systems
Optics Express, 2014Co-Authors: Wei Wang, Xian Xu, Qunbi Zhuge, Mathieu Chagnon, Mohamed Morsyosman, Minh Thang Hoang, Fangyuan Zhang, Rui Li, David V. PlantAbstract:We propose a decision-aided algorithm to compensate the sampling frequency offset (SFO) between the transmitter and receiver for reduced-Guard-Interval (RGI) coherent optical (CO) OFDM systems. In this paper, we first derive the cyclic prefix (CP) requirement for preventing OFDM symbols from SFO induced inter-symbol interference (ISI). Then we propose a new decision-aided SFO compensation (DA-SFOC) algorithm, which shows a high SFO tolerance and reduces the CP requirement. The performance of DA-SFOC is numerically investigated for various situations. Finally, the proposed algorithm is verified in a single channel 28 Gbaud polarization division multiplexing (PDM) RGI CO-OFDM experiment with QPSK, 8 QAM and 16 QAM modulation formats, respectively. Both numerical and experimental results show that the proposed DA-SFOC method is highly robust against the standard SFO in optical fiber transmission.
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Low overhead and nonlinear-tolerant adaptive zero-Guard-Interval CO-OFDM.
Optics Express, 2014Co-Authors: Qunbi Zhuge, Xian Xu, Mohamed Morsy-osman, Mathieu Chagnon, David V. PlantAbstract:We propose an adaptive channel estimation (CE) method for zero-Guard-Interval (ZGI) coherent optical (CO)-OFDM systems, and demonstrate its performance in a single channel 28 Gbaud polarization-division multiplexed ZGI CO-OFDM experiment with only 1% OFDM processing overhead. We systematically investigate its robustness against various transmission impairments including residual chromatic dispersion, polarization-mode dispersion, state of polarization rotation, sampling frequency offset and fiber nonlinearity. Both experimental and numerical results show that the adaptive CE-aided ZGI CO-OFDM is highly robust against these transmission impairments in fiber optical transmission systems.
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experimental demonstration of 28 gbaud qpsk and 16 qam zero Guard Interval co ofdm transmissions
Optical Communications (ECOC) 2012 38th European Conference and Exhibition on, 2014Co-Authors: Qunbi Zhuge, Mathieu Chagnon, Mohamed Morsyosman, Mohammad E Mousapasandi, Ziad A Elsahn, Chen Chen, David V. PlantAbstract:28 Gbaud QPSK and 16-QAM zero-Guard-Interval (ZGI) CO-OFDM transmission with only 1.34% overhead for OFDM processing is reported. The high tolerance of ZGI CO-OFDM to residual inter-symbol interference and imperfect frame synchronization is also demonstrated.
S Chandrasekhar - One of the best experts on this subject based on the ideXlab platform.
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multiband dft spread ofdm equalizer with overlapand add dispersion compensation for low overhead and low complexity channel equalization
Optical Fiber Communication Conference, 2013Co-Authors: Xiang Liu, S Chandrasekhar, Peter J Winzer, S Randel, S CorteselliAbstract:We describe a multi-band DFT-spread-OFDM equalizer that combines overlap-and-add dispersion compensation with OFDM demultiplexing for reduced Guard Interval and lowered DSP complexity, and demonstrate it in the transmission of a 22-Gbaud signal over 6400-km SSMF.
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448 gb s reduced Guard Interval co ofdm transmission over 2000 km of ultra large area fiber and five 80 ghz grid roadms
Journal of Lightwave Technology, 2011Co-Authors: S Chandrasekhar, Peter J Winzer, A H Gnauck, D W PeckhamAbstract:We propose a novel coherent optical orthogonal frequency-division multiplexing (CO-OFDM) scheme with reduced Guard Interval (RGI) for high-speed high-spectral-efficiency long-haul optical transmission. In this scheme, fiber chromatic dispersion is compensated for within the receiver rather than being accommodated by the Guard Interval (GI) as in conventional CO-OFDM, thereby reducing the needed GI, especially when fiber dispersion is large. We demonstrate the generation of a 448-Gb/s RGI-CO-OFDM signal with 16-QAM subcarrier modulation through orthogonal band multiplexing. This signal occupies an optical bandwidth of 60 GHz, and is transmitted over 2000 km of ultra-large-area fiber (ULAF) with five passes through an 80-GHz-grid wavelength-selective switch. Banded digital coherent detection with two detection bands is used to receive this 448-Gb/s signal. Wavelength-division multiplexed transmission of three 80-GHz spaced 448-Gb/s RGI-CO-OFDM channels is also demonstrated, achieving a net system spectral efficiency of 5.2 b/s/Hz and a transmission distance of 1600 km of ULAF.
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7 224 gb s wdm transmission of reduced Guard Interval co ofdm with 16 qam subcarrier modulation on a 50 ghz grid over 2000 km of ulaf and five roadm passes
European Conference on Optical Communication, 2010Co-Authors: Xiang Liu, S Chandrasekhar, Peter J Winzer, Benyuan Zhu, D W PeckhamAbstract:We demonstrate wavelength-division-multiplexed transmission of seven 224-Gb/s reduced-Guard-Interval CO-OFDM channels with 16-QAM subcarrier modulation on a 50-GHz grid, resulting in a net spectral efficiency of 4 b/s/Hz. Transmission over twenty 100-km ultra-large-area fiber spans and five wavelength-selective-switch passes is achieved.
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single coherent detection of a 606 gb s co ofdm signal with 32 qam subcarrier modulation using 4 80 gsamples s adcs
European Conference on Optical Communication, 2010Co-Authors: Xiang Liu, S Chandrasekhar, Peter J Winzer, Benyuan Zhu, S Draving, J Evangelista, N Hoffman, David W PeckhamAbstract:We report the detection of a record 606-Gb/s data rate (503-Gb/s excluding 20.5%-FEC-overhead) by a single coherent receiver using four 80-Gsamples/s 32.5-GHz-bandwidth ADCs and reduced-Guard-Interval CO-OFDM with 32-QAM. Transmission of the signal with 7.76-b/s/Hz net intrachannel spectral efficiency is demonstrated.
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ultra long haul transmission of 1 2 tb s multicarrier no Guard Interval co ofdm superchannel using ultra large area fiber
IEEE Photonics Technology Letters, 2010Co-Authors: S Chandrasekhar, D W Peckham, Robert LingleAbstract:We investigate the transmission performance of a 1.2-Tb/s no-Guard-Interval coherent optical orthogonal frequency-division-multiplexing channel over ultra-large-area fiber (ULAF) using two different amplification schemes. Ultra-long-haul transmissions over 52 and 72 100-km ULAF spans are demonstrated using hybrid Raman/erbium-doped-fiber amplifier and all-Raman amplification schemes, respectively. The optical signal-to-noise-ratio performance and the signal tolerance to fiber nonlinearity under these two amplifications are discussed.
D W Peckham - One of the best experts on this subject based on the ideXlab platform.
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448 gb s reduced Guard Interval co ofdm transmission over 2000 km of ultra large area fiber and five 80 ghz grid roadms
Journal of Lightwave Technology, 2011Co-Authors: S Chandrasekhar, Peter J Winzer, A H Gnauck, D W PeckhamAbstract:We propose a novel coherent optical orthogonal frequency-division multiplexing (CO-OFDM) scheme with reduced Guard Interval (RGI) for high-speed high-spectral-efficiency long-haul optical transmission. In this scheme, fiber chromatic dispersion is compensated for within the receiver rather than being accommodated by the Guard Interval (GI) as in conventional CO-OFDM, thereby reducing the needed GI, especially when fiber dispersion is large. We demonstrate the generation of a 448-Gb/s RGI-CO-OFDM signal with 16-QAM subcarrier modulation through orthogonal band multiplexing. This signal occupies an optical bandwidth of 60 GHz, and is transmitted over 2000 km of ultra-large-area fiber (ULAF) with five passes through an 80-GHz-grid wavelength-selective switch. Banded digital coherent detection with two detection bands is used to receive this 448-Gb/s signal. Wavelength-division multiplexed transmission of three 80-GHz spaced 448-Gb/s RGI-CO-OFDM channels is also demonstrated, achieving a net system spectral efficiency of 5.2 b/s/Hz and a transmission distance of 1600 km of ULAF.
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7 224 gb s wdm transmission of reduced Guard Interval co ofdm with 16 qam subcarrier modulation on a 50 ghz grid over 2000 km of ulaf and five roadm passes
European Conference on Optical Communication, 2010Co-Authors: Xiang Liu, S Chandrasekhar, Peter J Winzer, Benyuan Zhu, D W PeckhamAbstract:We demonstrate wavelength-division-multiplexed transmission of seven 224-Gb/s reduced-Guard-Interval CO-OFDM channels with 16-QAM subcarrier modulation on a 50-GHz grid, resulting in a net spectral efficiency of 4 b/s/Hz. Transmission over twenty 100-km ultra-large-area fiber spans and five wavelength-selective-switch passes is achieved.
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ultra long haul transmission of 1 2 tb s multicarrier no Guard Interval co ofdm superchannel using ultra large area fiber
IEEE Photonics Technology Letters, 2010Co-Authors: S Chandrasekhar, D W Peckham, Robert LingleAbstract:We investigate the transmission performance of a 1.2-Tb/s no-Guard-Interval coherent optical orthogonal frequency-division-multiplexing channel over ultra-large-area fiber (ULAF) using two different amplification schemes. Ultra-long-haul transmissions over 52 and 72 100-km ULAF spans are demonstrated using hybrid Raman/erbium-doped-fiber amplifier and all-Raman amplification schemes, respectively. The optical signal-to-noise-ratio performance and the signal tolerance to fiber nonlinearity under these two amplifications are discussed.
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transmission of a 448 gb s reduced Guard Interval co ofdm signal with a 60 ghz optical bandwidth over 2000 km of ulaf and five 80 ghz grid roadms
Optical Fiber Communication Conference, 2010Co-Authors: Xiang Liu, S Chandrasekhar, Peter J Winzer, A H Gnauck, Benyuan Zhu, D W PeckhamAbstract:We demonstrate the generation and detection of a novel reduced-Guard-Interval CO-OFDM signal at 448 Gb/s, occupying 60-GHz optical bandwidth. We transmit this signal over 2000 km of ULAF with five 80-GHz-grid WSS-based ROADM passes.
Robert Lingle - One of the best experts on this subject based on the ideXlab platform.
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ultra long haul transmission of 1 2 tb s multicarrier no Guard Interval co ofdm superchannel using ultra large area fiber
IEEE Photonics Technology Letters, 2010Co-Authors: S Chandrasekhar, D W Peckham, Robert LingleAbstract:We investigate the transmission performance of a 1.2-Tb/s no-Guard-Interval coherent optical orthogonal frequency-division-multiplexing channel over ultra-large-area fiber (ULAF) using two different amplification schemes. Ultra-long-haul transmissions over 52 and 72 100-km ULAF spans are demonstrated using hybrid Raman/erbium-doped-fiber amplifier and all-Raman amplification schemes, respectively. The optical signal-to-noise-ratio performance and the signal tolerance to fiber nonlinearity under these two amplifications are discussed.
Qunbi Zhuge - One of the best experts on this subject based on the ideXlab platform.
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design of enhanced channel equalizers for adaptive zero Guard Interval co ofdm systems
Optical Fiber Communication Conference, 2015Co-Authors: Wei Wang, Qunbi Zhuge, Yuliang Gao, David V. PlantAbstract:We propose the design of frequency domain block least-mean-square and recursive-least-square equalizers for adaptive zero-Guard-Interval CO-OFDM systems. Improvements in the channel estimation accuracy and channel tracking speed are experimentally and numerically demonstrated.
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decision aided sampling frequency offset compensation for reduced Guard Interval coherent optical ofdm systems
Optics Express, 2014Co-Authors: Wei Wang, Xian Xu, Qunbi Zhuge, Mathieu Chagnon, Mohamed Morsyosman, Minh Thang Hoang, Fangyuan Zhang, Rui Li, David V. PlantAbstract:We propose a decision-aided algorithm to compensate the sampling frequency offset (SFO) between the transmitter and receiver for reduced-Guard-Interval (RGI) coherent optical (CO) OFDM systems. In this paper, we first derive the cyclic prefix (CP) requirement for preventing OFDM symbols from SFO induced inter-symbol interference (ISI). Then we propose a new decision-aided SFO compensation (DA-SFOC) algorithm, which shows a high SFO tolerance and reduces the CP requirement. The performance of DA-SFOC is numerically investigated for various situations. Finally, the proposed algorithm is verified in a single channel 28 Gbaud polarization division multiplexing (PDM) RGI CO-OFDM experiment with QPSK, 8 QAM and 16 QAM modulation formats, respectively. Both numerical and experimental results show that the proposed DA-SFOC method is highly robust against the standard SFO in optical fiber transmission.
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Low overhead and nonlinear-tolerant adaptive zero-Guard-Interval CO-OFDM.
Optics Express, 2014Co-Authors: Qunbi Zhuge, Xian Xu, Mohamed Morsy-osman, Mathieu Chagnon, David V. PlantAbstract:We propose an adaptive channel estimation (CE) method for zero-Guard-Interval (ZGI) coherent optical (CO)-OFDM systems, and demonstrate its performance in a single channel 28 Gbaud polarization-division multiplexed ZGI CO-OFDM experiment with only 1% OFDM processing overhead. We systematically investigate its robustness against various transmission impairments including residual chromatic dispersion, polarization-mode dispersion, state of polarization rotation, sampling frequency offset and fiber nonlinearity. Both experimental and numerical results show that the adaptive CE-aided ZGI CO-OFDM is highly robust against these transmission impairments in fiber optical transmission systems.
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experimental demonstration of 28 gbaud qpsk and 16 qam zero Guard Interval co ofdm transmissions
Optical Communications (ECOC) 2012 38th European Conference and Exhibition on, 2014Co-Authors: Qunbi Zhuge, Mathieu Chagnon, Mohamed Morsyosman, Mohammad E Mousapasandi, Ziad A Elsahn, Chen Chen, David V. PlantAbstract:28 Gbaud QPSK and 16-QAM zero-Guard-Interval (ZGI) CO-OFDM transmission with only 1.34% overhead for OFDM processing is reported. The high tolerance of ZGI CO-OFDM to residual inter-symbol interference and imperfect frame synchronization is also demonstrated.
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Low Overhead Intra-Symbol Carrier Phase Recovery for Reduced-Guard-Interval CO-OFDM
Journal of Lightwave Technology, 2013Co-Authors: Qunbi Zhuge, Mohamed Morsy-osman, David V. PlantAbstract:We propose intra-symbol carrier phase recovery (IS-CPR) for reduced-Guard-Interval (RGI) CO-OFDM in order to compensate for the intra-symbol phase shift (ISPS) between subcarriers that is caused by the dispersion-enhanced phase noise (DEPN). We begin by proposing a pre-emphasized pilot subcarrier (PEPS) approach to reduce the pilot subcarrier overhead for the following IS-CPR algorithms. Then, we show a statistical analysis of the DEPN-induced ISPS between subcarriers within one symbol, which is related to the accumulated chromatic dispersion (CD). Next, three algorithms are proposed for IS-CPR including maximum-likelihood (ML) phase estimation, digital phase-locked loop (DPLL), and feedforward carrier recovery (FFCR) employing either the Mth power scheme in case of QPSK modulation or the QPSK partitioning scheme for the 16-QAM case. The performance and complexity of these algorithms are compared. Through simulations, we show that in comparison to conventional common phase error (CPE) compensation, IS-CPR significantly improves the linewidth tolerance at 1 dB signal-to-noise ratio (SNR) penalty for a bit error rate (BER) = 10-3 from 300 kHz to 2 MHz for 112 Gb/s systems (28 Gbaud QPSK) at 3200 km transmission distance, and from 70 kHz to 550 kHz for 448 Gb/s (56 Gbaud 16-QAM) systems at 1600 km transmission distance.