Nonlinear Coherent Optical Systems in the Presence of Equalization Enhanced Phase Noise

Jin, Cenqin; Shevchenko, Nikita A.; Li, Zhe; Popov, Sergei; Chen, Yunfei; Xu, Tianhua

doi:10.1109/jlt.2021.3076067

Cited by 51 publications

(35 citation statements)

References 24 publications

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“…It significantly degraded the performance of the uncompensated long-haul coherent optical fiber communication systems. For further discussion, the EEPN was reported in [34][35][36].…”

Section: Resultsmentioning

confidence: 99%

Effect of Phase Noise on the Optical Millimeter-Wave Signal in the DWDM-RoF System

et al. 2022

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In this study, we examined the effect of phase noise on the optical millimeter-wave (mm-wave) signal in a dense wavelength division multiplexing radio-over-fiber (DWDM-RoF) system. A single modulator was used to generate the optical mm-wave signal in the DWDM-RoF system. This paper addresses the impact of phase noise, which results from phase imbalance, on the optical mm-wave signal. To lower the effect of phase noise on the optical mm-wave signal, the phase imbalance should be controlled. The phase imbalance can be controlled and decreased by adjusting the phase at the phase shift (PS). The system performance was analyzed using various parameters such as bit error rate (BER), signal-to-noise ratio (SNR), optical signal to noise ratio (OSNR), and error vector magnitude (EVM). From the results, we found the phase imbalance affected the optical mm-wave signal due to the imbalanced splitting of the signal intensity at the MZM. The phase imbalance impacts the phase noise, which impacts the optical mm-wave signal. The phase noise could be decreased by controlling the phase imbalance at the phase of 5π/12. The best results at the phase of 5π/12 were collected for phase noise at 0.02 degrees.

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“…It significantly degraded the performance of the uncompensated long-haul coherent optical fiber communication systems. For further discussion, the EEPN was reported in [34][35][36].…”

Section: Resultsmentioning

confidence: 99%

Effect of Phase Noise on the Optical Millimeter-Wave Signal in the DWDM-RoF System

et al. 2022

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“…In [75], analytical modeling of the equalization enhanced phase noise (EEPN) has been developed for evaluating the performance of the optical transmission systems. The findings in [75] demonstrate the importance of considering EEPN in the design of the long-haul optical transmission system. In [76], an experimental study on the impact of EEPN on the optical transmission system has been carried out.…”

Section: Numerical Simulations and Discussionmentioning

confidence: 99%

A tutorial on fiber Kerr nonlinearity effect and its compensation in optical communication systems

Kumar

2021

J. Opt.

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The advent of silica-based low-cost standard single-mode fibers revolutionized the whole communication industry. The deployment of optical fibers in the networks induces a paradigm shift in the communication technologies used for long-haul information transfer. However, the communication using the optical fibers is affected by several linear and nonlinear effects. The most common linear effects are attenuation and chromatic dispersion, whereas the dominant nonlinear effect is the Kerr effect. The Kerr effect induces a power-dependent nonlinear distortion for the signal propagating in the optical fiber. The detrimental effects of the Kerr nonlinearity limit the capacity of long-haul optical communication systems. Fiber Kerr nonlinearity compensation using digital signal processing (DSP) techniques has been well investigated over several years. In this paper, we provide a comprehensive tutorial, including the fundamental mathematical analysis, on the characteristics of the optical fiber channel, the origin of the Kerr nonlinearity effect, the theory of the pulse propagation in the optical fiber, and the numerical and analytical tools for solving the pulse propagation equation. In addition, we provide a concise review of various DSP techniques for fiber nonlinearity compensation, such as digital back-propagation, Volterra series-based nonlinearity equalization, perturbation theory-based nonlinearity compensation, and phase conjugation. We also carry out numerical simulation and the complexity evaluation of the selected nonlinearity compensation techniques.

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“…q, r represents the indices of the memory k is nonlinearity index and R c and R b exhibit the leading and lagging delay tap lengths, respectively. Since, in [62][63][64][65][66][67][68][69][70][71], it was established that GMP is better as compared to MP, therefore for simplicity, evaluation with GMP is included in this paper.…”

Section: Generalized Memory Polynomial (Gmp)mentioning

confidence: 99%

Experimental Demonstration and Performance Enhancement of 5G NR Multiband Radio over Fiber System Using Optimized Digital Predistortion

et al. 2021

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This paper presents an experimental realization of multiband 5G new radio (NR) optical front haul (OFH) based radio over fiber (RoF) system using digital predistortion (DPD). A novel magnitude-selective affine (MSA) based DPD method is proposed for the complexity reduction and performance enhancement of RoF link followed by its comparison with the canonical piece wise linearization (CPWL), decomposed vector rotation method (DVR) and generalized memory polynomial (GMP) methods. Similarly, a detailed study is shown followed by the implementation proposal of novel neural network (NN) for DPD followed by its comparison with MSA, CPWL, DVR and GMP methods. In the experimental testbed, 5G NR standard at 20 GHz with 50 MHz bandwidth and flexible-waveform signal at 3 GHz with 20 MHz bandwidth is used to cover enhanced mobile broad band and small cells scenarios. A dual drive Mach Zehnder Modulator having two distinct radio frequency signals modulates a 1310 nm optical carrier using distributed feedback laser for 22 km of standard single mode fiber. The experimental results are presented in terms of adjacent channel power ratio (ACPR), error vector magnitude (EVM), number of estimated coefficients and multiplications. The study aims to identify those novel methods such as MSA DPD are a good candidate to deploy in real time scenarios for DPD in comparison to NN based DPD which have a slightly better performance as compared to the proposed MSA method but has a higher complexity levels. Both, proposed methods, MSA and NN are meeting the 3GPP Release 17 requirements.

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Nonlinear Coherent Optical Systems in the Presence of Equalization Enhanced Phase Noise

Abstract: Please refer to published version for the most recent bibliographic citation information. If a published version is known of, the repository item page linked to above, will contain details on accessing it.

Cited by 51 publications

References 24 publications

Effect of Phase Noise on the Optical Millimeter-Wave Signal in the DWDM-RoF System

Effect of Phase Noise on the Optical Millimeter-Wave Signal in the DWDM-RoF System

A tutorial on fiber Kerr nonlinearity effect and its compensation in optical communication systems

Experimental Demonstration and Performance Enhancement of 5G NR Multiband Radio over Fiber System Using Optimized Digital Predistortion

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