Graphics processing unit–accelerated finite-difference time-domain method for characterization of photonic crystal fibers

Oleksiy Shulika,Igor Sukhoivanov,Jose Amparo Andrade Lucio,Natalia Gurieva,Igor Guryev

doi:10.1117/1.oe.52.12.126109

Abstract

In the work, we have presented the technique based on the graphics processing unit accelerated finite-difference time-domain (FDTD) method for characterization of a single-mode photonic crystal fiber (PCF) with an arbitrary refractive index profile. In contrast to other numerical methods, the FDTD allows studying the mode propagation along the fiber. Particularly, we have focused attention on the method details that allowed us to reduce dramatically the computation time. It has been demonstrated that the accuracy of dispersion obtained by the FDTD method is comparable to the one provided by the finite elements method while possessing lower computation time. The method has been used to determine the fundamental mode cut-off of all-normal dispersion PCF and to find fiber losses beyond this wavelength.

Highlights

IntroductionThe photonic crystal fiber (PCF) technologies allow experimenting with complex and exotic fiber profiles discovering new possibilities and applications such as fiber sensors,[1] lasers,[2] and even textiles.[3] The properties of such fibers are well investigated
Today, the photonic crystal fiber (PCF) technologies allow experimenting with complex and exotic fiber profiles discovering new possibilities and applications such as fiber sensors,[1] lasers,[2] and even textiles.[3]
We present the finite-difference time-domain (FDTD) algorithm with unsplit-field perfectly-matched layer (PML) suitable for the fiber eigenfrequency computations

Summary

Introduction

The photonic crystal fiber (PCF) technologies allow experimenting with complex and exotic fiber profiles discovering new possibilities and applications such as fiber sensors,[1] lasers,[2] and even textiles.[3] The properties of such fibers are well investigated. In specific problems such as supercontinuum generation[4] and formation of the parabolic beam profile,[5] the exact dispersion, losses and nonlinearity profile of the fiber should be known. The method used to determine the dispersion depends on a fiber type. In case of large-mode PCF, such as LMA-20, even an analytical method works fine. As the fiber core size becomes smaller, numerical methods should be used. In case of low-size core, the fundamental mode cut-off of the fiber may exist close to an excitation wavelength which may introduce losses to the fiber due to the mode leaking

Methods

Results

Conclusion