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Proceedings Paper

Polymer-cladded athermal high-index-contrast waveguides
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Paper Abstract

We present a general approach to design temperature-independent high-index-contrast (HIC) waveguides using polymer claddings. Thermal stability has been a significant issue in electronic-photonic integrated circuits because of the heterogeneous heating resulting from integration with electronics. Due to silicons highly temperature-dependent optical properties, athermal performance in silicon-based devices is the critical limitation in device performance. In applications such as wavelength demultiplexing (WDM) and high-resolution spectroscopy, the thermo-optic (TO) effect results in a wavelength shifts and phase shifts in the spectral response peak of each wavelength channel, which limits the wavelength resolution and affects the spectral channel density. Instead of attempting to diminish temperature gradience across the chip, an elegant solution is to design athermal waveguides that are insensitive to ambient temperature. Thermo-optically neutral designs are achieved by choosing a polymer cladding material, whose thermo-optic coefficient is opposite to that of silicon (TOSi = +1.8×10-4 K-1). We present a comprehensive study of temperature dependence in HIC waveguides, using DuPont's polymers as the cladding materials. We provide general design criteria for athermal HIC waveguides by developing analytical and empirical expressions.

Paper Details

Date Published: 12 February 2008
PDF: 8 pages
Proc. SPIE 6897, Optoelectronic Integrated Circuits X, 68970S (12 February 2008); doi: 10.1117/12.789478
Show Author Affiliations
Winnie N. Ye, Massachusetts Institute of Technology (United States)
Jurgen Michel, Massachusetts Institute of Technology (United States)
Lionel C. Kimerling, Massachusetts Institute of Technology (United States)
Louay Eldada, DuPont Photonics Technologies (United States)

Published in SPIE Proceedings Vol. 6897:
Optoelectronic Integrated Circuits X
Louay A. Eldada; El-Hang Lee, Editor(s)

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