Temperature-Independent Narrow-Band Optical Filter by an Athermal Waveguide

Yasuo KOKUBUN  Shigeru YONEDA  Hiroaki TANAKA 

Publication
IEICE TRANSACTIONS on Electronics  Vol.E80-C  No.5  pp.632-639
Publication Date: 1997/05/20
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Photonic Integrated Circuits)
Category: 
Keyword: 
optical waveguide,  optical path length,  wavelength filter,  temperature dependence,  athermal waveguide, 

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Summary: 
The temperature dependence of the central wavelength of narrow-band filters is a serious problem for the dense WDM systems. In this study, we realized a temperature independent narrow-band filter at 1.3 µm wavelength. First, we designed an athermal waveguide in which optical path length is independent of temperature by using a finite element method. Using this athermal waveguide, we designed and fabricated a ring resonator. As a result, we successfully decreased the temperature coefficient of central wavelength to 710-4 nm/K, which is 7% of conventional SiO2 waveguide filters and 0.7% of conventional semiconductor waveguide filters.