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Article information
2018 , Volume 23, ¹ 6, p.4-13
Bednyakova A.E., Fedotenko T.M.
Numerical modelling of relative intensity noise (RIN) transfer as a result of four-wave mixing in optical communication links
It is well known that any real transmission link introduces distortions into the signal that can be either recoverable or not fully removable. The sources of such unremovable distortions leading to the loss of information are double Rayleigh scattering, amplified spontaneous emission, RIN (Relative Intensity Noise) transfer and nonlinear interactions such as four-wave mixing. In this paper we perform numerical investigation of signal propagation and RIN transfer in optical communication link with co-propagating pump. Despite the impossibility of intensity noise transfer from pump to signal due to stimulated Raman scattering (SRS), in the experiment signal degradation is observed even at small propagation lengths of 5-10 km. To find the origin of signal degradation, a numerical model is proposed based on the generalized nonlinear Schr¨odinger equation. The model takes into account the higher-order dispersion, Kerr nonlinearity, and the delayed Raman response of the medium. A more realistic model of the multimode pumping source is also employed. It is worth noting, that the most common analytical and numerical models, describing RIN transfer from pump to signal, are based on balance equations and neglects influence of dispersive and nonlinear effects. As a result of the numerical analysis, it was demonstrated that not only SRS but also four-wave mixing can initiate the process of noise transfer from pump to signal in the communication links.
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Keywords: optical communication links, Raman amplifier, relative intensity noise, RIN, four-wave mixing, Schrodinger equation, nonlinear fiber optics
doi: 10.25743/ICT.2018.23.6.002
Author(s):
Bednyakova Anastasia Evgenievna
PhD.
Position: Research Scientist
Office: Novosibirsk State University, Institute of Computational Technologies SB RAS
Address: 630090, Russia, Novosibirsk, 2, Pirogova str.
Phone Office: (383) 330-97-72
E-mail: anastasia.bednyakova@gmail.com
SPIN-code: 2089-3995Fedotenko Timofey Mikhaylovich
Position: assistant
Office: Novosibirsk State University
Address: 630090, Russia, Novosibirsk, 2, Pirogova str.
E-mail: timofeyfedotenko@gmail.com
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Bibliography link:
Bednyakova A.E., Fedotenko T.M. Numerical modelling of relative intensity noise (RIN) transfer as a result of four-wave mixing in optical communication links // Computational technologies. 2018. V. 23. ¹ 6. P. 4-13
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