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RIN transfer induced signal degradation in fiber optical communication links

Name
Timofey
Surname
Fedotenko
Scientific organization
Novosibirsk State University (NSU)
Academic degree
Master
Position
Engineer - researcher
Scientific discipline
Physics & Astronomy
Topic
RIN transfer induced signal degradation in fiber optical communication links
Abstract
This work is devoted to mathematical modeling of signal degradation in fiber optical communication links. We use the method of mathematical modeling based on non linear Shrodinger equation (NLSE) to investigate relative intensity noise(RIN) transfer in Raman fiber amplification systems. We demonstrate the calculation method of the RIN Transfer function within the NLSE based models and application of this methods to the study of the signal degradation problems.
Keywords
Fiber optical communication links, distrubuted Raman amplification, relative intensity noise (RIN), RIN Trasnfer, four-wave mixing
Summary

It is well known that degradation of an information signal during its propagation along the fiber optical communication link can significantly restrict bit rate. In practice, any real transmission link introduces distortions into the signal that can be either recoverable (e.g., dispersive broadening) or not fully removable (e.g., noise). The sources of such unremovable distortions leading to loss of information are double Rayleigh scattering (DRS), amplified spontaneous emission (ASE), RIN (Relative Intensity noise transfer) and nonlinear interactions such as four-wave mixing FWM [1]. Recently many works investigated RIN Transfer from pump to signal in Raman fiber lasers and amplifiers both numerically [2,3]

and analytically [4]. However, analytical models work only in the case of undepleted pump approximation, which is not always satisfied in the real communication links. Moreover, the most common analytical and numerical models are based on balance (average-power) equations and do not describe evolution of phase modulated signals along the fiber under influence of dispersive and nonlinear effects. To investigate RIN transfer in the real Raman fiber amplification systems we perform a numerical modelling based on a generalized nonlinear Schrödinger equation taking into account dispersion, Kerr nonlinearity and Raman gain. We develop a method of RIN transfer calculation in the amplitude models and use this method to study signal degradation. We numerically investigate phase-modulated signal degradation due to RIN transfer in the real optical communication link and show that not only Raman scattering but also FWM can initiate pump to signal intensity noise transfer.

[1] G. Agrawal, C. Headley, 374 (Academic Press, 2005)

[2] J. D. A Castanon, M. A. Camas, et al., Opt. Express 18, 23569 (2010)

[3] M. Krause, S. Cierullies, H. Renner, E. Brinkmeyer, Opt. Communications 260, 656 (2006)

[4] C. R. S. Fludger, V. Handerek, et al., J. Lightwave Technol 18, 1140 (2001)