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Proceedings Paper

Simulations of thermo-optic effects in beam propagation
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Paper Abstract

The finite difference beam propagation method (FD-BPM) is an effective model for simulating a wide range of optical waveguide structures. We present results of simulations combining this method with finite element modeling of thermal effects using Comsol FEMLAB software. These simulations were developed and are used to examine propagation of optical signals in polymer waveguides in which inhomogeneous temperature profiles are induced using MEMS microheaters, for example, for use in switching applications. Thermal modeling combined with values of the thermo-optic nonlinearity yields three-dimensional refractive index profiles in the active regions of a variety of waveguide structures. The change in the refractive index profile of cladding induces mode deformations and transmission losses due to leakage at the core/cladding interface, in addition to phase shifts in the propagating beams. These effects are used to design thermo-optic switches in both multimode and single mode waveguides, and study the direct effect on propagation due to changes in the applied heater power. In addition, we demonstrate the utility of applying the method to assessing losses due to thermally induced inhomogeneities in planar lightwave circuits such as optical interconnects.

Paper Details

Date Published: 25 October 2004
PDF: 10 pages
Proc. SPIE 5595, Active and Passive Optical Components for WDM Communications IV, (25 October 2004); doi: 10.1117/12.571401
Show Author Affiliations
Changbao Ma, Georgetown Univ. (United States)
Edward R. Van Keuren, Georgetown Univ. (United States)

Published in SPIE Proceedings Vol. 5595:
Active and Passive Optical Components for WDM Communications IV
Achyut Kumar Dutta; Abdul Ahad Sami Awwal; Niloy K. Dutta; Yasutake Ohishi, Editor(s)

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