Noise Gain Features of Fiber Raman Amplifier

Georgii S Felinskyi,Mykhailo Y Dyriv

doi:10.1155/2016/5843636

Georgii S Felinskyi, Mykhailo Y Dyriv

Open Access

https://doi.org/10.1155/2016/5843636

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Abstract

The formation dynamics of the optical noise in a silica single mode fiber (SMF) as function of the pump power variation in the counter pumped fiber Raman amplifier (FRA) is experimentally studied. The ratio between the power of amplified spontaneous emission and the power of incoherent optical noise is quantitatively determined by detailed analysis of experimental data in the pump powers range of 100–300 mW within the full band of Stokes frequencies, including FRA working wavelengths over the C + L transparency windows. It is found out the maximum of Raman gain coefficient for optical noise does not exceed ~60% of corresponding peak at the gain profile maximum of coherent signal. It is shown that the real FRA noise figure may be considerably less than 3 dB over a wide wavelength range (100 nm) at a pump power of several hundreds of mW.

Highlights

IntroductionRaman scattering were the first practical devices of nonlinear optics widely used in the high-speed and long distance telecommunication [1, 2]
The fiber optic amplifiers based on the effect of stimulatedRaman scattering were the first practical devices of nonlinear optics widely used in the high-speed and long distance telecommunication [1, 2].It is commonly accepted in digital communication systems to use the bit error rate (BER) Ber as a generalized quality parameter to describe the statistical probability of the bit errors occurrence [3]
We present the results of our experimental studies of Stokes noise gain in single mode fiber

Summary

Introduction

Raman scattering were the first practical devices of nonlinear optics widely used in the high-speed and long distance telecommunication [1, 2]. The almost complete absence of FRA effect on the Ber degradation is observed [8] just at the start of FRA application It is shown in the early 2000s [3, 4, 9] that one can really achieve Ber ∼ 10−12 without any additional methods for error correction in the terabit telecommunication over the distance of many hundred kilometers. The linear approach to electronic equivalent circuits used in the phenomenological theory is unacceptable to the description of such nonlinear processes as Raman light scattering.

Fundamentals of the Spontaneous and Stimulated Light Scattering

Study of Stokes Noise Amplification in Single Mode Fiber

Quantitative Analysis of FRA Noise Properties

Findings

Conclusions