Silicon-on-Insulator All-Pass Microring Resonators Using a Polarization Rotating Coupling Section

Author

De Heyn, Peter ; Vermeulen, Diedrik ; Van Thourhout, Dries ; Roelkens, Gunther

Author_Institution

Dept. of Inf. Technol., Ghent Univ., Ghent, Belgium

Volume

24

Issue

14

fYear

2012

fDate

7/15/2012 12:00:00 AM

Firstpage

1176

Lastpage

1178

Abstract

We propose a novel microring resonator concept that uses a polarization rotating asymmetrical directional coupler. The quasi-transverse electric polarized mode in the bus waveguide is used to excite the quasi-transverse magnetic (TM) polarized mode in the microring. This enables the realization of microrings with a high quality factor due to the lower scattering loss of the quasi-TM polarized mode. We demonstrate the operation principle with two all-pass microrings with radius 30 μm, working in the critically coupled regime with a quality factor of 31 000 and in the under-coupled regime with a quality factor of 125 000.

Keywords

Q-factor; integrated optics; light polarisation; light scattering; micro-optomechanical devices; micromechanical resonators; optical directional couplers; optical losses; optical resonators; optical rotation; optical waveguides; silicon-on-insulator; Si; bus waveguide; coupling section; polarization rotating asymmetrical directional coupler; quality factor; quasiTM polarized mode; quasitransverse electric polarized mode; quasitransverse magnetic polarized mode; radius 30 mum; scattering loss; silicon-on-insulator all-pass microring resonators; Couplings; Directional couplers; Propagation losses; Q factor; Silicon; Waveguide discontinuities; Microring resonators; polarization rotator; silicon-on-insulator (SOI);

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2012.2198460

Filename

6205605