Integrated SU-8 Prisms and Microgratings for Polarization-Selective Fiber-to-Silicon Waveguide Coupling

Author

Huang, Sheng-Wen ; Ku, Kai-Ning ; Lee, Ming-Chang Mark ; Nguyen, Minh-Hang ; Tseng, Fan-Gang

Author_Institution

Dept. of Electr. Eng., Nat. Tsing Hua Univ., Hsinchu, Taiwan

Volume

24

Issue

12

fYear

2012

fDate

6/15/2012 12:00:00 AM

Firstpage

1054

Lastpage

1056

Abstract

A polarization-selective fiber-to-silicon waveguide coupler made by an SU-8 prism as well as a micrograting is demonstrated. The size of the SU-8 prism well matches the core dimension of a single-mode fiber to increase the coupling efficiency, and the micrograting provides the selectivity of polarization mode coupling. Only the TE wave is able to be coupled to the silicon waveguide. The measured coupling loss of the SU-8 prism and the micrograting is 4.5 dB. The polarization extinction ratio is 20 dB. The fiber misalignment tolerances are 2 and 3 μ m for the x- (lateral) and y- (vertical) directions, respectively, according to a transmission window of 3-dB drop.

Keywords

diffraction gratings; elemental semiconductors; optical fibre couplers; optical fibre polarisation; optical prisms; optical waveguides; silicon; SU-8 prisms; Si; microgratings; polarization-selective fiber-to-silicon waveguide coupler; single-mode fiber; Couplings; Gratings; Optical fiber couplers; Optical fiber sensors; Silicon; Optical interconnect; polarization-selective coupler; silicon photonics;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2012.2192919

Filename

6177224