Efficient Active-to-Passive Light Coupling of InGaAsP/InP Laser Using Subwavelength Coupler

Author

Xiaojun Liang ; Jianwei Mu ; Xun Li ; Yanping Xi

Author_Institution

Dept. of Electr. & Comput. Eng., McMaster Univ., Hamilton, ON, Canada

Volume

5

Issue

6

fYear

2013

fDate

Dec. 2013

Firstpage

6602408

Lastpage

6602408

Abstract

We propose a subwavelength coupler for efficient light coupling from an InGaAsP/InP laser to a passive waveguide. The active-to-passive coupling device is designed on the asymmetric twin waveguide (ATG) platform with two InGaAsP layers: one is used as the laser active layer, and the other with a wider band gap is used as the guiding layer of the passive waveguide. By introducing subwavelength trenches in the active InGaAsP layer, the subwavelength coupler is designed to provide a gradual effective index transition region, and it couples the light between the vertically separated active and passive layers. Simulation result shows that coupling efficiency of 86.5% is achieved at a length of only 31 μm.

Keywords

III-V semiconductors; gallium arsenide; gradient index optics; indium compounds; optical couplers; optical waveguides; semiconductor lasers; ATG; InGaAsP-InP; Subwavelength Coupler; active-to-passive light coupling; asymmetric twin waveguide; coupling efficiency; gradual effective index transition region; laser active layer; passive waveguide; size 31 mum; InGaAsP/InP laser; active-to-passive coupling; subwavelength coupler;

fLanguage

English

Journal_Title

Photonics Journal, IEEE

Publisher

ieee

ISSN

1943-0655

Type

jour

DOI

10.1109/JPHOT.2013.2292345

Filename

6671950