High Efficient Subwavelength Binary Blazed Grating Beam Splitter via Vertical Coupling

Author

Yang, Junbo ; Zhou, Zhiping ; Zhou, Wei ; Zhang, Xueao ; Jia, Honghui

Author_Institution

State Key Lab. on Adv. Opt. Commun. Syst. & Networks, Peking Univ., Beijing, China

Volume

23

Issue

13

fYear

2011

fDate

7/1/2011 12:00:00 AM

Firstpage

896

Lastpage

898

Abstract

We propose a novel broadband beam splitter (BS) with a single-layer and compact grating vertical coupling structure, which is based on the form birefringence of subwavelength binary blazed grating and effective-medium theory. Rigorous coupled-wave analysis is used to optimize the design of this beam splitter. The simulation and analysis show that the BS for transverse electric (TE) light are designed to split the incident light beam into two beams of equal power (nearly 50% split), which travel in opposite directions in the waveguide. The coupling length is about 9 . The coupling efficiency for the right and the left branches of waveguide are 47% and 52%, respectively. The power difference of two output ports is less than 15% over a 75-nm wavelength bandwidth range.

Keywords

birefringence; coupled mode analysis; diffraction gratings; optical beam splitters; optical couplers; optical design techniques; optical waveguides; optimisation; birefringence; coupled-wave analysis; effective-medium theory; optical design; optical waveguide; optimization; subwavelength binary blazed grating beam splitter; transverse electric light; vertical coupling structure; Couplings; Diffraction gratings; Gratings; Materials; Optical beams; Optical waveguides; Planar waveguides; Beam splitter; blazed grating; nanowaveguide;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2011.2142298

Filename

5750033