Reducing the complexity of perturbation based nonlinearity pre-compensation using symmetric EDC and pulse shaping

Gao, Ying; Cartledge, J.C.; Karar, Abdullah S.; Yam, S.S.-H.; O’Sullivan, Maurice; Laperle, Charles; Borowiec, A.; Roberts, Kim

doi:10.1364/oe.22.001209

Cited by 79 publications

(51 citation statements)

References 13 publications

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“…Number of techniques in optical domain and digital domain are proposed for compensation of fiber nonlinear impairments. Some of the compensation methods include electronic equalization , digital back propagation(DBP) , optical phase conjugation(OPC) ,frequency referenced transmission , phase conjugated twin waves ,spectral conversion [9-10]perturbation based nonlinear mitigation [11][12]. One of the prominent fiber transmission impairment compensation method for the coherent optical systems is the use of Digital Back-propagation (DBP) algorithm .…”

Section: Imentioning

confidence: 99%

Implementation of Memory Polynomial Based Adaptive Digital Post distortion for Coherent Optical System

Mehra¹

2017

IJRASET

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The exponential growth in the ever -increasing demand of information require highly spectral efficient coherent optical systems with advanced modulation formats which allow the detection of in-phase and quadrature components of both polarizations and doubles the available capacity and spectral efficiency but the optical signal is severely degraded by linear and nonlinear transmission impairments after passing through the fiber. We have designed and implemented adaptive digital post distortion model to reduce fiber nonlinear impairments using memory polynomial for single channel DP-16QAM coherent system. Keywords: Digital Post distortion DPost-D, DP-16QAM, Memory polynomial, Coherent system, ACPR I.INTRODUCTION Due to the limitation of transmission bandwidth and the exponential growth in the demand of network traffic, mobile applications, internet video services , there is a strong requirement of the employment of highly spectral efficient coherent systems with advanced modulation formats such as Dual polarization quaternary phase shift keying (DP-QPSK) and Dual polarization 16 quadrature amplitude modulation ( DP-16QAM) which reduces the cost per bit and increase transmission capacity for high data rate signals. Higher optical signal to noise ratio (OSNR) is required with advanced modulation formats for long haul transmission system for achieving given bit error rate(BER)which requires more signal launch power in the fiber but increased launch power degrades signal quality due to kerr nonlinear effects that limits the achievable transmission distance in single channel and WDM systems [1][2][3][4][5][6][7][8].As compensation of linear effects is possible , research is boosted for compensation of nonlinear impairments which limit the transmission performance of the system. Number of techniques in optical domain and digital domain are proposed for compensation of fiber nonlinear impairments. Some of the compensation methods include electronic equalization , digital back propagation(DBP) , optical phase conjugation(OPC) ,frequency referenced transmission , phase conjugated twin waves ,spectral conversion [9-10]perturbation based nonlinear mitigation [11][12]. One of the prominent fiber transmission impairment compensation method for the coherent optical systems is the use of Digital Back-propagation (DBP) algorithm . Split step fourier transform and Volterra series nonlinear equalizer techniques based on digital back propagation have been used for fiber non linearity compensation. Main drawback of these techniques is the high complexity requirement in practical implementation due to large number of iterations. [13].Various investigations have been done to minimize the complexity requirement [14][15][16] .Algorithms based on DSP with DBP-SSFM and DBP-VSNE have been investigated to reduce the complexity for fiber nonlinear impairment compensation. In spite of these investigations there are number of models developed in wireless communication which can be investigated in the optical systems to further reduce ...

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Section: Imentioning

confidence: 99%

Implementation of Memory Polynomial Based Adaptive Digital Post distortion for Coherent Optical System

Mehra¹

2017

IJRASET

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“…A sufficiently accurate closed-form for N S > 1 can be derived by truncating (8) to the first 2 terms. These terms rapidly dominate the higher order terms as N S increases, particularly considering that B 2 = 1/6 and B 4 = −1/30.…”

Section: Appendixmentioning

confidence: 99%

“…Optical techniques include, for example, optical phase conjugation (OPC) using twin waves [1] or OPC devices placed mid-span [2]. Digital techniques include transmitter- [3], [4] and receiver-side [5] digital nonlinearity compensation (NLC), simple nonlinear phase shifts [6], [7], perturbation-based precompensation [8], adaptive filtering [9] and optimum detection [10]. With the exception of optimum detection (a special case of receiver-side NLC for single span transmission) the digital signal processing (DSP) techniques are algorithms which invert the propagation equations for the optical fiber, either exactly or with simplifying approximations.…”

Section: Introductionmentioning

confidence: 99%

The benefit of split nonlinearity compensation for single channel optical fiber communications

Lavery

Ives

Liga

et al. 2016

2016 IEEE Photonics Conference (IPC)

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Abstract-In this letter, we analyze the benefit of digital compensation of fiber nonlinearity, where the digital signal processing is divided between the transmitter and the receiver. The application of the Gaussian noise model indicates that, where there are two or more spans, it is always beneficial to split the nonlinearity compensation. The theory is verified via numerical simulations, investigating the transmission of a single-channel 50-GBd polarization division multiplexed 4-and 256-ary quadrature amplitude modulation signals over 100-km standard singlemode fiber spans, using lumped amplification. It is shown, theoretically, that the signal-to-noise ratio gain for long distances and high bandwidth transmission is 1.5 dB versus transmitteror receiver-based nonlinearity compensation.

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“…The required number of terms in the summations can be reduced by using symmetric electronic dispersion compensation (SEDC) and root-raised-cosine (RRC) pulse shaping [7]. With SEDC two simplifications result: (i) the real parts of the coefficients are zero and (ii) the imaginary parts are calculated based on half the link length.…”

Section: Pre-compensation For Intra-channel Fiber Nonlinearitiesmentioning

confidence: 99%

“…The former category includes (i) single-channel and multi-channel digital back propagation using the coupled nonlinear Schrödinger equation (CNLSE) [2,3], (ii) Volterra series nonlinear equalizers [4], (iii) perturbation solutions to the CNLSE [5][6][7], (iv) compensation of the nonlinear phase noise [8], and (v) optical phase conjugation [9]. The latter category includes (i) optical pulse shaping [10], (ii) subcarrier modulation [11], (iii) nonlinear noise squeezing that occurs for real-valued signals [12] or conjugated twin waves in the polarization domain [13], and (iv) constellation design [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Signal Processing Techniques for Reducing the Impact of Fiber Nonlinearities on System Performance

Cartledge

Ellis

Shiner

et al. 2016

Optical Fiber Communication Conference

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Reducing the complexity of perturbation based nonlinearity pre-compensation using symmetric EDC and pulse shaping

Cited by 79 publications

References 13 publications

Implementation of Memory Polynomial Based Adaptive Digital Post distortion for Coherent Optical System

Implementation of Memory Polynomial Based Adaptive Digital Post distortion for Coherent Optical System

The benefit of split nonlinearity compensation for single channel optical fiber communications

Signal Processing Techniques for Reducing the Impact of Fiber Nonlinearities on System Performance

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