Athermal Narrow-Band Optical Filter at 1. 55 µ m Wavelength by Silica-Based Athermal Waveguide

Yasuo KOKUBUN  Shigeru YONEDA  Shinnosuke MATSUURA  

IEICE TRANSACTIONS on Electronics   Vol.E81-C   No.8   pp.1187-1194
Publication Date: 1998/08/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on High-Capacity WDM/TDM Networks)
silica optical waveguide,  athermal waveguide,  optical filter,  optical path length,   temperature dependence,  

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The temperature dependence of central wavelength of optical filters is a serious problem for the dense WDM systems. This dependence is owing to the temperature dependence of optical path-length of the waveguide. In this study, we realized a temperature independent silica-based optical filter at 1. 55 µm wavelength using an athermal waveguide, in which optical pathlength is independent of temperature. First, we designed a silica-based athermal waveguide, and next we designed and fabricated a ring resonator using the athermal waveguide. As a result, we successfully decreased the temperature dependence of central wavelength to less than 4 10 -4 nm/K, which is 3% and 0. 3% of corresponding values of conventional silica-based and semiconductor waveguide filters, respectively.