Model of Temperature Dependence Shape of Ytterbium -doped Fiber Amplifier Operating at 915 nm Pumping Configuration

Abdel Hakeim,Fady I

doi:10.14569/ijacsa.2011.021002

Abstract

We numerically analyze the temperature dependence of an ytterbium-doped fiber amplifier (YDFA) operating at 915 nm, investigating its gain and Noise Figure properties variation with temperature. The temperature-dependent gain and noise figure variation with YDFA length are numerically obtained for the temperature range of +20 0C to +70 0C. The results show that good intrinsic output stability against temperature change can be achieved in ytterbium doped fiber amplifiers even when operating at high gain regime with small signal input. This result demonstrates the great potential for stable high power laser communication systems based on ytterbium system.

Highlights

Fiber lasers and amplifiers have attracted great interest recently, because they offer the advantages of compact size, high gain, guided mode propagation, better stability and their outstanding thermo-optical properties [1,2,3,4]
We studied the variation of gain and noise figure (NF) with the length of the amplifier over the temperature range from 20 oC to 70 oC at signal wavelength of 1064 nm
It is clear from the results that the signal gain raises with increases in the length, at the same time the gain declines when the temperature increases

Summary

INTRODUCTION

Fiber lasers and amplifiers have attracted great interest recently, because they offer the advantages of compact size, high gain, guided mode propagation, better stability and their outstanding thermo-optical properties [1,2,3,4]. Ytterbium (Yb3+) doped fiber Amplifier (YDFA) has a great potential because it does not have some of the drawbacks associated with erbiumdoped amplifier: excited state absorption phenomenon that can reduce the pump efficiency and concentration quenching by interionic energy transfer do not occur, and high doping levels are possible. It offers high output power (or gain) with a smaller fiber length. This paper demonstrates output characteristics of Yb3+-doped fiber laser at different temperatures degrees. Accurate characterization of Yb3+ absorption and emission cross sections is crucial [20,21]

THEORETICAL MODEL

Spectroscopy of ytterbium in silica

G Gh s h s

RESULTS AND DISSCUSSIONS

CONCLUSION