Journal
OPTICS COMMUNICATIONS
Volume 321, Issue -, Pages 23-27Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2014.01.064
Keywords
Optical polymers; Silicon nitride waveguide; Bragg grating; Tunable filter
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Funding
- German Federal Ministry of Education and Research (BMBF)
- European Commission
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A series of tunable filters based on silicon nitride waveguide Bragg gratings buried in polymer are studied, fabricated and analyzed. The gratings are etched completely through the waveguides to improve the peak reflectivity at short grating lengths. Reflectivity from 1% to 70% can be reached when the third-order grating length varies from 16 gm to 160 mu m. The experimental results are in good agreement with numerical simulations. Due to its compact size and the thermal advantages of polymer, the filter can be tuned very efficiently by a micro heater buried beneath. A tuning range of 34.5 nm is demonstrated at a heat power of only 22 mW. (C) 2014 Elsevier B.V. All rights reserved.
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