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Chunxiong Bao - One of the best experts on this subject based on the ideXlab platform.

Jingchi Cheng - One of the best experts on this subject based on the ideXlab platform.

  • general model of signal propagation in a raman amplified single mode fiber based coherent Optical Communication System
    Optics Communications, 2016
    Co-Authors: Jingchi Cheng, Perry Ping Shum, Ming Tang, Deming Liu
    Abstract:

    Abstract The distributed Raman amplifier (DRA) has been widely utilized in state-of-the-art coherent Optical Communication Systems using multi-level modulation formatted signals in order to improve transmission performance. A general model based on Jones vector notation governing the signal propagation under Raman amplified link is proposed. Primary physics including both linear and nonlinear effects have been taken into account. The numerical approach for solving the equations is illustrated in detail. Using the model, System characterization and optimization can be easily performed. We also compare our model with the commonly used coarse-step method. It is found that the coarse-step method will exaggerate the cross-polarization modulation induced impairments by over 6 dB and will become unusable when the pump power is as high as several Watts. The proposed model provides a guideline for the simulation of Raman amplified coherent transmission Systems.

  • relative phase noise induced impairment in co ofdm Optical Communication System with distributed fiber raman amplifier
    Optics Letters, 2014
    Co-Authors: Jingchi Cheng, Perry Ping Shum, Ming Tang, Lei Deng, Fu Songnian, Deming Liu
    Abstract:

    In this Letter, we demonstrate that the interplay between Raman pump relative intensity noise and cross-phase modulation leads to a relative phase noise (RPN) that brings non-negligible performance degradation to coherent Optical orthogonal frequency-division multiplexing (CO-OFDM) transmission Systems with co-pumped Raman amplification. By theoretical analysis and numerical simulation, we proved that RPN brings more System impairment in terms of Q-factor penalty than the single carrier System, and relatively larger walk-off between pump and signal helps to suppress the RPN induced impairment. A higher-order modulated signal is less tolerant to RPN than a lower-order signal. With the same spectral efficiency, the quadrature-amplitude modulation format shows better tolerance to RPN than phase-shift keying. The reported findings will be useful for the design and optimization of Raman amplified CO-OFDM multi-carrier transmission Systems.

  • relative phase noise estimation and mitigation in raman amplified coherent Optical Communication System
    Optics Express, 2014
    Co-Authors: Jingchi Cheng, Perry Ping Shum, Ming Tang, Deming Liu, Meng Xiang, Zhenhua Feng
    Abstract:

    The interplay between the stochastic intensity fluctuation of Raman pump laser and cross-phase modulation (XPM) effect in transmission Optical fiber leads to additional phase noise, namely, relative phase noise (RPN) of signal in multi-level modulated coherent Optical Communication System. Both theoretical analysis and quantitative simulation have been performed to investigate the characteristics and impact of RPN. Being low-pass in nature, RPN is different from XPM induced phase noise in PSK/OOK hybrid System, and has not been considered yet. The noise power of RPN can accumulate incoherently along transmission links. With a proper signal model, we study the impact of RPN to the coherent Optical Communication System through Monte Carlo simulation. RPN will cause more cycle slips in Viterbi-and-Viterbi (V-V) phase estimation (PE), and the quantitative analysis of cycle slip probability is carried out. When using sliding window V-V without any optimization, the Q factor penalty of RPN on DQPSK signal can be as large as around 5 dB in strong RPN condition. However, it can be reduced by over 3 dB when using an optimal block size or optimal averaging weights.

  • relative phase noise induced impairment in m ary phase shift keying coherent Optical Communication System using distributed fiber raman amplifier
    Optics Letters, 2013
    Co-Authors: Jingchi Cheng, Songnian Fu, Ming Tang, Perry Ping Shum
    Abstract:

    We show for the first time, to the best of our knowledge, that, in a coherent Communication System that employs a phase-shift-keying signal and Raman amplification, besides the pump relative intensity noise (RIN) transfer to the amplitude, the signal’s phase will also be affected by pump RIN through the pump–signal cross-phase modulation. Although the average pump power induced linear phase change can be compensated for by the phase-correction algorithm, a relative phase noise (RPN) parameter has been found to characterize pump RIN induced stochastic phase noise. This extra phase noise brings non-negligible System impairments in terms of the Q-factor penalty. The calculation shows that copumping leads to much more stringent requirements to pump RIN, and relatively larger fiber dispersion helps to suppress the RPN induced impairment. A higher-order phase-shift keying (PSK) signal is less tolerant to noise than a lower-order PSK.

Perry Ping Shum - One of the best experts on this subject based on the ideXlab platform.

  • general model of signal propagation in a raman amplified single mode fiber based coherent Optical Communication System
    Optics Communications, 2016
    Co-Authors: Jingchi Cheng, Perry Ping Shum, Ming Tang, Deming Liu
    Abstract:

    Abstract The distributed Raman amplifier (DRA) has been widely utilized in state-of-the-art coherent Optical Communication Systems using multi-level modulation formatted signals in order to improve transmission performance. A general model based on Jones vector notation governing the signal propagation under Raman amplified link is proposed. Primary physics including both linear and nonlinear effects have been taken into account. The numerical approach for solving the equations is illustrated in detail. Using the model, System characterization and optimization can be easily performed. We also compare our model with the commonly used coarse-step method. It is found that the coarse-step method will exaggerate the cross-polarization modulation induced impairments by over 6 dB and will become unusable when the pump power is as high as several Watts. The proposed model provides a guideline for the simulation of Raman amplified coherent transmission Systems.

  • relative phase noise induced impairment in co ofdm Optical Communication System with distributed fiber raman amplifier
    Optics Letters, 2014
    Co-Authors: Jingchi Cheng, Perry Ping Shum, Ming Tang, Lei Deng, Fu Songnian, Deming Liu
    Abstract:

    In this Letter, we demonstrate that the interplay between Raman pump relative intensity noise and cross-phase modulation leads to a relative phase noise (RPN) that brings non-negligible performance degradation to coherent Optical orthogonal frequency-division multiplexing (CO-OFDM) transmission Systems with co-pumped Raman amplification. By theoretical analysis and numerical simulation, we proved that RPN brings more System impairment in terms of Q-factor penalty than the single carrier System, and relatively larger walk-off between pump and signal helps to suppress the RPN induced impairment. A higher-order modulated signal is less tolerant to RPN than a lower-order signal. With the same spectral efficiency, the quadrature-amplitude modulation format shows better tolerance to RPN than phase-shift keying. The reported findings will be useful for the design and optimization of Raman amplified CO-OFDM multi-carrier transmission Systems.

  • relative phase noise estimation and mitigation in raman amplified coherent Optical Communication System
    Optics Express, 2014
    Co-Authors: Jingchi Cheng, Perry Ping Shum, Ming Tang, Deming Liu, Meng Xiang, Zhenhua Feng
    Abstract:

    The interplay between the stochastic intensity fluctuation of Raman pump laser and cross-phase modulation (XPM) effect in transmission Optical fiber leads to additional phase noise, namely, relative phase noise (RPN) of signal in multi-level modulated coherent Optical Communication System. Both theoretical analysis and quantitative simulation have been performed to investigate the characteristics and impact of RPN. Being low-pass in nature, RPN is different from XPM induced phase noise in PSK/OOK hybrid System, and has not been considered yet. The noise power of RPN can accumulate incoherently along transmission links. With a proper signal model, we study the impact of RPN to the coherent Optical Communication System through Monte Carlo simulation. RPN will cause more cycle slips in Viterbi-and-Viterbi (V-V) phase estimation (PE), and the quantitative analysis of cycle slip probability is carried out. When using sliding window V-V without any optimization, the Q factor penalty of RPN on DQPSK signal can be as large as around 5 dB in strong RPN condition. However, it can be reduced by over 3 dB when using an optimal block size or optimal averaging weights.

  • relative phase noise induced impairment in m ary phase shift keying coherent Optical Communication System using distributed fiber raman amplifier
    Optics Letters, 2013
    Co-Authors: Jingchi Cheng, Songnian Fu, Ming Tang, Perry Ping Shum
    Abstract:

    We show for the first time, to the best of our knowledge, that, in a coherent Communication System that employs a phase-shift-keying signal and Raman amplification, besides the pump relative intensity noise (RIN) transfer to the amplitude, the signal’s phase will also be affected by pump RIN through the pump–signal cross-phase modulation. Although the average pump power induced linear phase change can be compensated for by the phase-correction algorithm, a relative phase noise (RPN) parameter has been found to characterize pump RIN induced stochastic phase noise. This extra phase noise brings non-negligible System impairments in terms of the Q-factor penalty. The calculation shows that copumping leads to much more stringent requirements to pump RIN, and relatively larger fiber dispersion helps to suppress the RPN induced impairment. A higher-order phase-shift keying (PSK) signal is less tolerant to noise than a lower-order PSK.

Jie Yang - One of the best experts on this subject based on the ideXlab platform.

Ming Tang - One of the best experts on this subject based on the ideXlab platform.

  • general model of signal propagation in a raman amplified single mode fiber based coherent Optical Communication System
    Optics Communications, 2016
    Co-Authors: Jingchi Cheng, Perry Ping Shum, Ming Tang, Deming Liu
    Abstract:

    Abstract The distributed Raman amplifier (DRA) has been widely utilized in state-of-the-art coherent Optical Communication Systems using multi-level modulation formatted signals in order to improve transmission performance. A general model based on Jones vector notation governing the signal propagation under Raman amplified link is proposed. Primary physics including both linear and nonlinear effects have been taken into account. The numerical approach for solving the equations is illustrated in detail. Using the model, System characterization and optimization can be easily performed. We also compare our model with the commonly used coarse-step method. It is found that the coarse-step method will exaggerate the cross-polarization modulation induced impairments by over 6 dB and will become unusable when the pump power is as high as several Watts. The proposed model provides a guideline for the simulation of Raman amplified coherent transmission Systems.

  • relative phase noise induced impairment in co ofdm Optical Communication System with distributed fiber raman amplifier
    Optics Letters, 2014
    Co-Authors: Jingchi Cheng, Perry Ping Shum, Ming Tang, Lei Deng, Fu Songnian, Deming Liu
    Abstract:

    In this Letter, we demonstrate that the interplay between Raman pump relative intensity noise and cross-phase modulation leads to a relative phase noise (RPN) that brings non-negligible performance degradation to coherent Optical orthogonal frequency-division multiplexing (CO-OFDM) transmission Systems with co-pumped Raman amplification. By theoretical analysis and numerical simulation, we proved that RPN brings more System impairment in terms of Q-factor penalty than the single carrier System, and relatively larger walk-off between pump and signal helps to suppress the RPN induced impairment. A higher-order modulated signal is less tolerant to RPN than a lower-order signal. With the same spectral efficiency, the quadrature-amplitude modulation format shows better tolerance to RPN than phase-shift keying. The reported findings will be useful for the design and optimization of Raman amplified CO-OFDM multi-carrier transmission Systems.

  • relative phase noise estimation and mitigation in raman amplified coherent Optical Communication System
    Optics Express, 2014
    Co-Authors: Jingchi Cheng, Perry Ping Shum, Ming Tang, Deming Liu, Meng Xiang, Zhenhua Feng
    Abstract:

    The interplay between the stochastic intensity fluctuation of Raman pump laser and cross-phase modulation (XPM) effect in transmission Optical fiber leads to additional phase noise, namely, relative phase noise (RPN) of signal in multi-level modulated coherent Optical Communication System. Both theoretical analysis and quantitative simulation have been performed to investigate the characteristics and impact of RPN. Being low-pass in nature, RPN is different from XPM induced phase noise in PSK/OOK hybrid System, and has not been considered yet. The noise power of RPN can accumulate incoherently along transmission links. With a proper signal model, we study the impact of RPN to the coherent Optical Communication System through Monte Carlo simulation. RPN will cause more cycle slips in Viterbi-and-Viterbi (V-V) phase estimation (PE), and the quantitative analysis of cycle slip probability is carried out. When using sliding window V-V without any optimization, the Q factor penalty of RPN on DQPSK signal can be as large as around 5 dB in strong RPN condition. However, it can be reduced by over 3 dB when using an optimal block size or optimal averaging weights.

  • relative phase noise induced impairment in m ary phase shift keying coherent Optical Communication System using distributed fiber raman amplifier
    Optics Letters, 2013
    Co-Authors: Jingchi Cheng, Songnian Fu, Ming Tang, Perry Ping Shum
    Abstract:

    We show for the first time, to the best of our knowledge, that, in a coherent Communication System that employs a phase-shift-keying signal and Raman amplification, besides the pump relative intensity noise (RIN) transfer to the amplitude, the signal’s phase will also be affected by pump RIN through the pump–signal cross-phase modulation. Although the average pump power induced linear phase change can be compensated for by the phase-correction algorithm, a relative phase noise (RPN) parameter has been found to characterize pump RIN induced stochastic phase noise. This extra phase noise brings non-negligible System impairments in terms of the Q-factor penalty. The calculation shows that copumping leads to much more stringent requirements to pump RIN, and relatively larger fiber dispersion helps to suppress the RPN induced impairment. A higher-order phase-shift keying (PSK) signal is less tolerant to noise than a lower-order PSK.