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A Compact All-Silicon Temperature Insensitive Filter for WDM and Bio-Sensing Applications

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3 Author(s)
Sarvagya Dwivedi ; Photonics Research Group, Department of Information Technology, Ghent University, Center of Nano- and Biophotonics, Gent, Belgium ; Herbert D'heer ; Wim Bogaerts

We propose a compact, temperature-insensitive, and all-silicon Mach-Zehnder interferometer filter that uses the polarization-rotating asymmetrical directional couplers. Temperature sensitivity of the filter is for a wavelength range of 30 nm. The device achieves a reduced footprint by making use of different polarizations, which is made possible by the asymmetric directional couplers that act both as a splitter/combiner and as a polarization rotator. Simulation of the device shows that it can also be useful for gas sensing and bio-sensing applications with three times larger response to cladding changes while keeping a thermally robust behavior.

Published in:

IEEE Photonics Technology Letters  (Volume:25 ,  Issue: 22 )