Title :
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
fDate :
4/1/2005 12:00:00 AM
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;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2005.843954
