Title :
Wavelength tuning in distributed feedback lasers by quantum well intermixing
Author :
Chan, K.S. ; Pun, E.Y.B. ; Zhan, L.
Author_Institution :
Dept. of Phys. & Mater. Sci., City Univ. of Hong Kong, China
Abstract :
We analyzed theoretically the wavelength tuning mechanisms in distributed feedback (DFB) lasers using quantum well intermixing. The main factor that limits the maximum tuning range is elucidated in the analysis. It is due to the increase in carrier density required to maintain the gain above the threshold after the bandgap is blue-shifted by intermixing. The effect of grating period is also investigated and shown to have strong effects. Changing the grating period can shift the maximum tuning range from 3.5 nm to 20 nm.
Keywords :
carrier density; diffraction gratings; distributed feedback lasers; integrated optoelectronics; laser tuning; quantum well lasers; spectral line shift; bandgap; blue-shift; carrier density; distributed feedback lasers; grating period; integrated optoelectronics; quantum well intermixing; wavelength tuning; Distributed feedback devices; Gratings; Laser feedback; Laser theory; Laser tuning; Optical attenuators; Optical refraction; Photonic band gap; Quantum well lasers; Waveguide lasers;
Conference_Titel :
Optoelectronics, Proceedings of the Sixth Chinese Symposium
Print_ISBN :
0-7803-7887-3
DOI :
10.1109/COS.2003.1278184
