Comparative Study of the Birefringence in Photonic Crystal Fiber Lasers

N Rouchdi,M Abouricha,A Boulezhar,M Kriraa

doi:10.4236/opj.2015.511030

Abstract

In this paper, we study the birefringence in photonic crystal fiber lasers PCFs and in conventional fiber lasers in the bi-directional pump scheme in the linear cavity laser. We show that the value of birefringence in photonic crystal fibers is smaller than that of conventional fiber lasers [1].

Highlights

Photonic crystal fibers (PCFs) are attracting increasing interests because of their unique properties such as: endlessly single-mode guiding, freedom of dispersion characteristics, and large mode area [2] [3]
We focus on PCFs in which a core doped with Yb3+ is surrounded by a lower index cladding, which is, surrounded by an air-clad region, in turn, surrounded by a second lower index cladding index
Using analytical and numerical calculations, the finite-difference method (FDM) and a simple model of (PCFs), we have determined the distributions of pump and laser along the PCFs in the forward and bidirectional pumped YPCFs, and the birefringence in PCF laser dope ytterbium in cases the forward and bi-directional pump scheme respectively as function of the radius

Summary

Introduction

Photonic crystal fibers (PCFs) are attracting increasing interests because of their unique properties such as: endlessly single-mode guiding, freedom of dispersion characteristics, and large mode area [2] [3]. We focus on PCFs in which a core doped with Yb3+ is surrounded by a lower index cladding, which is, surrounded by an air-clad region, in turn, surrounded by a second lower index cladding index. We use the rate equation for finding the expressions of the temperature dependence in Regions I, II, III, and IV [4] [5]. In order to get this dependence we utilize the results of the expressions for the stress components ( σ r (r ) , σφ (r ) , and σ y (r ) ), the change in the index of refraction and the birefringence with the result of the birefringence in Regions I, II, III, and IV. The obtained results are compared for different pump schemes for giving the design guidelines to ensure maximum heat dissipation and pump powers

Theoretical Model

Findings

Simulation and Discussion

Conclusion