1. Introduction
The design of Raman fiber lasers and Raman fiber amplifiers is an area of study that suffers
continuous changes due to new approaches and applications raised in industry, in modern research
laboratories, in telecom systems, in the medical field, in applications such as laser guiding stars for
astronomical observations and LIDAR [1]–[3]. The coupled differential equations that govern the
stimulated Raman scattering that use these models have been widely known and put into practice
for decades. The variables involved in these processes such as the Raman gain coefficient and the
effective area, have been studied with analytical solutions and experimental techniques. However,
the first proposed analytical solution so far, allows interplay between these variables at the specific
point called Raman threshold, but this solution comes from several assumptions [4]. And thus, this
leads to a mathematical equation that relates the variables approximately. For this reason, to
calculate the exact values of the Raman gain coefficient and the effective area other techniques
parallel to the Raman threshold technique have been developed. Some techniques for measuring
the efficiency of the Raman gain use methods based on optical time domain reflectometry [5]–[8],
and others, by analysis of Raman threshold [9]–[12].
In this paper, we take a mathematical equation that relates the Raman gain with experimental
variables [13]. This formula comes from an analytical solution to the set of differential equations
governing the stimulated Raman scattering. With this simple technique it is possible to accurately
estimate the Raman gain efficiency.
1. IntroductionThe design of Raman fiber lasers and Raman fiber amplifiers is an area of study that sufferscontinuous changes due to new approaches and applications raised in industry, in modern researchlaboratories, in telecom systems, in the medical field, in applications such as laser guiding stars forastronomical observations and LIDAR [1]–[3]. The coupled differential equations that govern thestimulated Raman scattering that use these models have been widely known and put into practicefor decades. The variables involved in these processes such as the Raman gain coefficient and theeffective area, have been studied with analytical solutions and experimental techniques. However,the first proposed analytical solution so far, allows interplay between these variables at the specificpoint called Raman threshold, but this solution comes from several assumptions [4]. And thus, thisleads to a mathematical equation that relates the variables approximately. For this reason, tocalculate the exact values of the Raman gain coefficient and the effective area other techniquesparallel to the Raman threshold technique have been developed. Some techniques for measuringthe efficiency of the Raman gain use methods based on optical time domain reflectometry [5]–[8],and others, by analysis of Raman threshold [9]–[12].In this paper, we take a mathematical equation that relates the Raman gain with experimentalvariables [13]. This formula comes from an analytical solution to the set of differential equationsgoverning the stimulated Raman scattering. With this simple technique it is possible to accuratelyestimate the Raman gain efficiency.
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