Tunable wavelength filters with Bragg gratings in polymer waveguides
- 2 November 1998
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 73 (18) , 2543-2545
- https://doi.org/10.1063/1.122527
Abstract
Tunable wavelength filters are demonstrated based on the thermo-optic refractive index change of the polymer waveguide with Bragg reflection grating. For the low-loss waveguide operating around 1.55 μm, fluorinated polymers are incorporated. Bragg reflection gratings are fabricated using a phase mask and a high-index polymer. The Bragg reflector exhibits a narrow bandwidth of less than 1.0 nm, a crosstalk of −20 dB, an insertion loss of 3.2 dB, and a flat-top passband. The peak wavelength of Bragg reflection is shifted over 11 nm with a slight insertion loss change. The thermo-optic tuning efficiency is 22 nm/W and the peak shift is linearly proportional to the heating power.Keywords
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