Abstract

We propose an integrated Bragg grating (BG) filter with reflection light dropped in a silicon-on-insulator platform. Most of the light reflected by the BG is coupled to a branch waveguide, while some residual reflected light radiates rather than propagating back to the input port. The structure is mainly composed of an antisymmetric BG and an asymmetric directional coupler. Two mode conversions between the fundamental transverse electric mode and the first higher order transverse electric mode are applied to control the on-chip light route. The proposed structure is investigated via simulation and experiment. Two integrated BGs—a π phase-shifted grating and a chirped grating—are successfully fabricated. The proposed structure is expected to aid practical applications of BGs to various photonic integrated devices.

© 2019 IEEE

Demonstration of a mode-conversion cavity add–drop filter

Marcel W. Pruessner, Jacob B. Khurgin, Todd H. Stievater, William S. Rabinovich, Robert Bass, J. Brad Boos, and Vincent J. Urick
Opt. Lett. 36(12) 2230-2232 (2011)

On-chip mode converter based on two cascaded Bragg gratings

Rulei Xiao, Yuechun Shi, Jia Li, Pan Dai, Yong Zhao, Lianyan Li, Jun Lu, and Xiangfei Chen
Opt. Express 27(3) 1941-1957 (2019)

Add-drop filter based on TiO₂ coated shifted Bragg grating

Somnath Paul, Ismo Vartiainen, Matthieu Roussey, Toni Saastamoinen, Jani Tervo, Seppo Honkanen, and Markku Kuittinen
Opt. Express 24(23) 26901-26910 (2016)

Tunable channel drop filters consisting of a tilted Bragg grating and a mode sorting polymer waveguide

Tae-Hyun Park, Jin-Soo Shin, Guanghao Huang, Woo-Sung Chu, and Min-Cheol Oh
Opt. Express 24(6) 5709-5714 (2016)

Add-drop filters based on mode-conversion cavities

Jacob B. Khurgin, Marcel W. Pruessner, Todd H. Stievater, and William S. Rabinovich
Opt. Lett. 32(10) 1253-1255 (2007)