Title :
Analysis of external optical feedback on distributed-feedback semiconductor lasers above threshold
Author :
Wu, Huoy-Jong ; Chang, Hung-Chun
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
Abstract :
An analysis of external optical feedback based on distributed-feedback (DFB) semiconductor lasers above threshold is presented. It is based on a numerical model taking into account the longitudinal spatial hole burning (SHB) effect, which has been recently known to be an important phenomenon for DFB lasers above threshold. Numerical results for a typical index-coupled quarter-wave-shifted (QWS) DFB laser with a moderate coupling coefficient ( kappa L=3) are given. It was found that the SHB effect can affect the sensitivity to feedback for DFB lasers above threshold.<>
Keywords :
distributed feedback lasers; feedback; laser theory; optical hole burning; semiconductor lasers; sensitivity; DFB lasers; above threshold; distributed-feedback semiconductor lasers; external optical feedback; index-coupled; longitudinal spatial hole burning; moderate coupling coefficient; numerical model; quarter-wave-shifted; sensitivity; Charge carrier density; Distributed feedback devices; Equations; Fiber lasers; Laser feedback; Laser modes; Laser theory; Optical feedback; Refractive index; Semiconductor lasers;
Journal_Title :
Photonics Technology Letters, IEEE
