title: Spiral Bragg grating waveguides for TM mode silicon photonics.
abstract: 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.
authors.forename: Zhitian
authors.initials: Z
authors.lastname: Chen
authors.forename: Jonas
authors.initials: J
authors.lastname: Flueckiger
authors.forename: Xu
authors.initials: X
authors.lastname: Wang
authors.forename: Fan
authors.initials: F
authors.lastname: Zhang
authors.forename: Han
authors.initials: H
authors.lastname: Yun
authors.forename: Zeqin
authors.initials: Z
authors.lastname: Lu
authors.forename: Michael
authors.initials: M
authors.lastname: Caverley
authors.forename: Yun
authors.initials: Y
authors.lastname: Wang
authors.forename: Nicolas A F
authors.initials: NA
authors.lastname: Jaeger
authors.forename: Lukas
authors.initials: L
authors.lastname: Chrostowski