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Article information
2017 , Volume 22, ¹ 6, p.12-22
Bednyakova A.E., Fedotenko T.M.
Numerical modelling of relative intensity noise transfer in coherent optical communication links with distributed Raman amplification
The paper addresses an investigation of RIN transfer from pump to signal in distributed Raman amplifiers using the methods of numerical modelling. The process of RIN transfer was investigated by other authors both numerically and analytically. However, the vast majority of models are based on power balance equations derived in quasimonochromatic approximation. These models do not take into account the influence of nonlinear and dispersive effects on a signal in a long fiber and cannot be used to describe phase-modulated signal evolution in coherent optical communication links. In this work a numerical model based on the nonlinear Schr¨odinger equation was implemented, which enables study of phase-modulated signal propagation in Raman amplifier under influence of dispersion, nonlinearity and different noise sources including pump noise and amplified spontaneous emission (ASE). Using the proposed model we studied signal degradation in real coherent communication link with distributed Raman amplification and bi-directional pumping. The results of the numerical simulations are in a good agreement with the experiment. Numerical optimization of pump noise was performed. It demonstrated that the decrease of low-frequency component of pump noise below 35dB/Hz leads to the decrease of pump-to-signal RIN transfer to the negligibly low level, achievable only in the amplifier with counter-propagating pump.
[full text]
Keywords: coherent optical communication links, Raman amplifier, relative intensity noise, RIN, Schrodinger equation, nonlinear fiber optics
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 transfer in coherent optical communication links with distributed Raman amplification // Computational technologies. 2017. V. 22. ¹ 6. P. 12-22
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