Mitigation of Fiber Nonlinearity Using a Digital Coherent Receiver

Millar, David S.; Makovejs, Sergejs; Behrens, Carsten; Hellerbrand, Stephan; Killey, Robert I.; Bayvel, Polina; Savory, Seb J.

doi:10.1109/jstqe.2010.2047247

Cited by 115 publications

(62 citation statements)

References 18 publications

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“…The second observation in this article is about the oversampling rate which improves system performance by DBP. A number of investigations with diverse transmission configurations have been done with coherent detection and split-step Fourier method (SSFM) Mateo et al, 2011;Millar et al, 2010;Mussolin et al, 2010;Rafique et al, 2011a;Yaman et al, 2009). The results in these articles shows efficient mitigation of CD and NL.…”

Section: State Of the Artmentioning

confidence: 99%

Digital Backward Propagation: A Technique to Compensate Fiber Dispersion and Non-Linear Impairments

Asif¹,

Lin²,

Schmauß³

2011

Applications of Digital Signal Processing

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Section: State Of the Artmentioning

confidence: 99%

Digital Backward Propagation: A Technique to Compensate Fiber Dispersion and Non-Linear Impairments

Asif¹,

Lin²,

Schmauß³

2011

Applications of Digital Signal Processing

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“…With higher baud-rates and advanced modulation formats, channel capacity [1,2] is limited by the signal degradation due to fiber non-linearity, as it increases with signal input power. The DBP algorithm allows joint compensation of chromatic dispersion (CD) and non-linearities (NL) [3][4][5][6] along with the coherent receiver. It can be implemented by inversely solving the non-linear Schrodinger equation (NLSE) using split-step Fourier methods (SSFM).…”

Section: Introductionmentioning

confidence: 99%

All-optical Signal Processing of Fiber Impairments in Dual-Polarization 112 Gbit/s m-ary QAM Coherent Transmission

Asif

Islam

Zafrullah

2013

Journal of the Optical Society of Korea

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We have numerically implemented a receiver side all-optical signal processing method, i.e. optical backward propagation (OBP), by dispersion compensating fiber (DCF) and non-linear compensator (NLC) devised by effective negative Kerr non-linear coefficient using two highly non-linear fibers (HNLFs). The method is implemented for the post-processing of fiber transmission impairments, i.e. chromatic dispersion (CD) and non-linearities (NL). The OBP module is evaluated for dual-polarization (DP) m-ary (m=4,16,32,64,256) quadrature amplitude modulation (QAM) in 112 Gbit/s coherent transmission over 1200 km standard single mode fiber (SMF). We have also investigated an intensity limited optical backward propagation module (IL-OBP) by using a self-phase modulation-based optical limiter with an appropriate pre-chirping to compensate for the intensity fluctuations in the transmission link. Our results show that in highly non-linear sensitive 256QAM transmission, we have observed a 66% increase in the transmission distance by implementing IL-OBP as compared to conventional OBP.

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“…The technology of coherent optical communications has enabled a dramatic improvement of fiber-optic transmission systems. The introduction of advanced modulation formats [1] and digital signal processing (DSP) for coherent communications (see, e.g., [2][3][4] and references therein) led to practical implementation of systems with 100 Gb∕s channel rates. The key to this breakthrough is the possibility to mitigate the most important linear transmission impairments, such as fiber link dispersion and polarization-mode dispersion.…”

mentioning

confidence: 99%

“…The current trend in the field of optical telecommunications is using the dispersion noncompensated transmission regime, in which dispersion dominates over nonlinearity. The main linear time-invariant channel impairments such as chromatic dispersion and polarizationmode dispersion can be compensated by the adaptive linear equalization technique [2][3][4]15]. Though nonlinear transmission impairments due to fiber Kerr nonlinearity can be compensated by nonlinear backward propagation, this requires substantial computational efforts to model reverse signal channel propagation.…”

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confidence: 99%

Digital signal processing based on inverse scattering transform

Turitsyna

Turitsyn

2013

Opt. Lett.

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Through numerical modeling, we illustrate the possibility of a new approach to digital signal processing in coherent optical communications based on the application of the so-called inverse scattering transform. Considering without loss of generality a fiber link with normal dispersion and quadrature phase shift keying signal modulation, we demonstrate how an initial information pattern can be recovered (without direct backward propagation) through the calculation of nonlinear spectral data of the received optical signal. The technology of coherent optical communications has enabled a dramatic improvement of fiber-optic transmission systems. The introduction of advanced modulation formats [1] and digital signal processing (DSP) for coherent communications (see, e.g., [2][3][4] and references therein) led to practical implementation of systems with 100 Gb∕s channel rates. The key to this breakthrough is the possibility to mitigate the most important linear transmission impairments, such as fiber link dispersion and polarization-mode dispersion. In coherent fiber-optic communication systems, the received optical signal is digitized through high-speed analog-to-digital converters and then processed using DSP algorithms. The input signal is recovered with the accuracy allowed by the channel noise and the transmission effects that are not equalized by DSP. After the mitigation of linear effects, noise and nonlinear impairments become the key factors in limiting the performance of coherent fiber-optic communication systems. In this Letter, through numerical modeling we illustrate for the optical communication community the possibility of using the inverse scattering transform (IST) (see [5][6][7][8][9] and references therein)-a technique developed few decades ago in other areas of physics-for mitigation of nonlinear impairments in coherent optical communications. Without loss of generality, we illustrate the application of the IST to transmission of a quadrature phase shift keying (QPSK) signal in a normal dispersion fiber link. Note that, in general, the power of a signal transmitted through an optical fiber link is degraded by loss and has to be periodically recovered through optical amplification. In many important practical situations, averaging of such periodic loss and gain results in an effectively lossless propagation model-the nonlinear Schrödinger (NLS) equation [6,10]. Moreover, it has recently been experimentally demonstrated that fiber loss can be compensated continuously along a fiber span leading to effectively quasi-lossless transmission [11][12][13]. Therefore, the NLS equation is an important principal model that is used for demonstrating key techniques and approaches in optical fiber communications. In dimensionless units, the master equation reads [6,10]where s signβ 2 1 for normal and anomalous dispersion, respectively (β 2 is the group velocity dispersion coefficient); here we consider normal dispersion without loss of generality. The propagation distance z Z∕L D is normalized by the dispersion l...

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Mitigation of Fiber Nonlinearity Using a Digital Coherent Receiver

Cited by 115 publications

References 18 publications

Digital Backward Propagation: A Technique to Compensate Fiber Dispersion and Non-Linear Impairments

Digital Backward Propagation: A Technique to Compensate Fiber Dispersion and Non-Linear Impairments

All-optical Signal Processing of Fiber Impairments in Dual-Polarization 112 Gbit/s m-ary QAM Coherent Transmission

Digital signal processing based on inverse scattering transform

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