Spiral Bragg grating waveguides for TM mode silicon photonics

We demonstrate spiral Bragg grating waveguides (BGWs) on the silicon-on-insulator (SOI) platform for the fundamental transverse magnetic (TM) mode. We also compare TM spiral waveguides to equivalent transverse electric (TE) spiral waveguides and show that the TM spiral waveguides have lower propagat...

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Bibliographic Details
Published in:Optics express 2015-09, Vol.23 (19), p.25295-25307
Main Authors: Chen, Zhitian, Flueckiger, Jonas, Wang, Xu, Zhang, Fan, Yun, Han, Lu, Zeqin, Caverley, Michael, Wang, Yun, Jaeger, Nicolas A F, Chrostowski, Lukas
Format: Article
Language:English
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Summary:We demonstrate spiral Bragg grating waveguides (BGWs) on the silicon-on-insulator (SOI) platform for the fundamental transverse magnetic (TM) mode. We also compare TM spiral waveguides to equivalent transverse electric (TE) spiral waveguides and show that the TM spiral waveguides have lower propagation losses. Our spiral waveguides are space-efficient, requiring only areas of 131×131 µm(2) to accommodate 4 mm long BGWs, and, thus, are less susceptible to fabrication non-uniformities. Due to the lengths and reduced susceptibility to fabrication non-uniformities, we were able to obtain narrow bandwidth, large extinction ratio (ER) devices, as narrow as 0.09 nm and as large as 52 dB, respectively. Finally, we demonstrate a 4 mm long TM chirped spiral Bragg grating waveguide with a negative, average, group delay slope of -11 ps/nm.
ISSN:1094-4087
1094-4087
DOI:10.1364/oe.23.025295