Share Email Print
cover

Optical Engineering

Simple approach to calculate the refractive index profile of ion-exchanged waveguides
Author(s): Sergio Sebastiani; Simone Berneschi; Massimo Brenci; Gualtiero Nunzi-Conti; Stefano Pelli; Giancarlo C. Righini
Format Member Price Non-Member Price
PDF $20.00 $25.00

Paper Abstract

In graded-index glass waveguides a key factor for the design of components and devices is usually the accurate determination of the refractive index profile as a function of depth. The problem of reconstructing the index profile using the measured effective refractive indices has been faced by several authors. Here we suggest a new expression, linear combination of two analytical functions, which is able to provide a good approximation of the solution of the differential equation that rules the thermal diffusion process. The use of this equation, in connection with the general approach of inverting the Wentzel-Kramer-Bruilloin (WKB) eigenvalue equation, leads to a simple, fast, and accurate computation of the refractive index profile obtained by ion exchange. The application of the method to various Ag-exchanged waveguides in different glass matrices, with better accuracy than most of the usual procedures, has been demonstrated.

Paper Details

Date Published: 1 May 2005
PDF: 5 pages
Opt. Eng. 44(5) 054602 doi: 10.1117/1.1914802
Published in: Optical Engineering Volume 44, Issue 5
Show Author Affiliations
Sergio Sebastiani, Istituto di Fisica Applicata Nello Carrara (Italy)
Simone Berneschi, Istituto di Fisica Applicata Nello Carrara (Italy)
Massimo Brenci, Istituto di Fisica Applicata Nello Carrara (Italy)
Gualtiero Nunzi-Conti, Istituto di Fisica Applicata Nello Carrara (Italy)
Stefano Pelli, Istituto di Fisica Applicata Nello Carrara (Italy)
Giancarlo C. Righini, Istituto di Fisica Applicata Nello Carrara (Italy)


© SPIE. Terms of Use
Back to Top