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Temperature-Independent Narrow-Band Optical Filter by an Athermal Waveguide
Yasuo KOKUBUN Shigeru YONEDA Hiroaki TANAKA
IEICE TRANSACTIONS on Electronics
Publication Date: 1997/05/25
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Photonic Integrated Circuits)
optical waveguide, optical path length, wavelength filter, temperature dependence, athermal waveguide,
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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.