Investigation of optical feedback in high-speed electroabsorption modulated lasers with a window region

Author

Byeong Hoon Park ; In Kim ; Byung-Kwon Kang ; Yu-Dong Bae ; Sang-Moon Lee ; Young Hyun Kim ; Jang, D.-H. ; Tae-Il Kim

Author_Institution

Telecommun. R&D Center, Samsung Electron. Co., Gyeonggi-Do, South Korea

Volume

17

Issue

4

fYear

2005

fDate

4/1/2005 12:00:00 AM

Firstpage

777

Lastpage

779

Abstract

The optimum waveguide design for optical feedback reduction in a 10-Gb/s electroabsorption modulated laser has been discussed. A device with a 30-μm-long window region exhibited as much as 10-15-dB reduction, which is verified by experimental results and the beam propagation calculation. Using a tilted waveguide with the window region, the feedback factor is reduced to as low as -40 dB. Besides low optical feedback, the tilted-and-straight modulator has a sufficient dc extinction ratio and a far-field profile allowing larger than 60% fiber-coupling efficiency.

Keywords

electroabsorption; high-speed optical techniques; laser feedback; optical fibre communication; optical fibre couplers; optical modulation; quantum well lasers; waveguide lasers; 10 Gbit/s; 30 mum; beam propagation calculation; dc extinction ratio; electroabsorption modulated lasers; far-field profile; feedback factor; fiber-coupling efficiency; high-speed lasers; low optical feedback; multiple quantum wells; optical feedback; optimum waveguide design; tilted waveguide; tilted-and-straight modulator; window region; Extinction ratio; Fiber lasers; Laser beams; Laser feedback; Optical feedback; Optical propagation; Optical reflection; Optical waveguides; Surface emitting lasers; Waveguide lasers; Distributed feedback (DFB) lasers; electroabsorption; monolithic integrated circuits; optical reflection;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2005.843954

Filename

1411873