Modeling and numerical simulation of gain of Nd-doped fiber amplifier in 1. 7um~1. 8um

Abstract

Fiber amplifier is an important piece of equipment to ensure the long-distance communication of optical fiber. The rare-earth ion-doped fiber amplifier is a hot issue studied in many articles. However, few articles investigate Neodymium-doped fiber amplifiers for 1.7μm optical signal amplification because of the low signal gain. Therefore, this paper establishes the system model of Neodymium ion to realize the optical signal amplification in the 1.7μm band. It establishes its mathematical model by using the equation of rate and power transmission equation and solves it numerically to realize the numerical simulation of Neodymium-doped fiber amplifier for 1.7μm optical signal amplification, and studies the simulation results, summarizes the amplifier properties, and fits the results to get the mathematical expressions. This paper finds that the plot of gain variation with fiber position contains a linear asymptote with a slope less than zero. The asymptote is related to the initial signal light and the optical power of the pump. Increasing the doping concentration will cause the optical signal to converge to this asymptote faster. The numerical fitting results in this paper can be applied to the estimation of gains as well as to generate insights into theoretical studies, such as considering the possibility of applying the Weber distribution commonly used for infinite optical communication in fiber models.