Corrugated Waveguide-Based Optical Phased Array With Crosstalk Suppression

Author

Kwong, David ; Hosseini, Amir ; Covey, John ; Xiaochuan Xu ; Yang Zhang ; Chakravarty, Swapnajit ; Chen, Ray T.

Author_Institution

Univ. of Texas at Austin, Austin, TX, USA

Volume

26

Issue

10

fYear

2014

fDate

15-May-14

Firstpage

991

Lastpage

994

Abstract

We present the corrugated waveguide as a free space grating coupler for use in optical phased arrays for large angle optical beam steering. Compared with conventional shallow etched gratings, the corrugated waveguide requires only a single patterning step while achieving lithographically defined index contrast. We achieve 15° of steering with wavelength tuning, with an average longitudinal beam width of 0.3°. To prevent optical crosstalk from grating-assisted coupling in a corrugated waveguide array with small element spacing, the photonic bandgap of a 2D photonic crystal is used to optically isolate each array element in a 16 element array.

Keywords

beam steering; diffraction gratings; optical arrays; optical couplers; optical crosstalk; optical tuning; optical waveguides; photonic band gap; photonic crystals; 2D photonic crystal; array element; corrugated waveguide-based optical phased array; element spacing; free space grating coupler; grating-assisted coupling; large angle optical beam steering; lithographically defined index contrast; longitudinal beam width; optical crosstalk suppression; photonic bandgap; wavelength tuning; Arrayed waveguide gratings; Arrays; Couplers; Gratings; Indexes; Optical crosstalk; Optical waveguide; gratings; phased array; photonic crystal; photonic integrated circuit; silicon nanomembrane;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2014.2311454

Filename

6766227