Title :
Reduction of second- and third-order harmonic distortion by nonlinear absorption in gain-coupled distributed-feedback laser diodes
Author :
Futakuchi, Naoki ; Taguchi, Tomoyuki ; Nakano, Yoshiaki
Author_Institution :
Dept. of Electron. Eng., Tokyo Univ., Japan
Abstract :
We have calculated the characteristics of second- and third-order harmonic distortion in gain-coupled distributed feedback (DFB) lasers using a set of three rate equations. In these calculations, the relaxation oscillation, nonlinear gain compression, and nonlinear loss compression are taken into account. We have found that modulation distortion due to nonlinear gain compression is reduced significantly in the gain-coupled DFB laser of absorptive-grating type. This improvement occurs because gain compression is compensated by loss compression within the grating
Keywords :
diffraction gratings; distributed feedback lasers; harmonic distortion; light absorption; nonlinear optics; optical losses; semiconductor lasers; absorptive-grating type; gain-coupled DFB laser; gain-coupled DFB lasers; gain-coupled distributed-feedback laser diodes; loss compression; modulation distortion; nonlinear absorption; nonlinear gain compression; nonlinear loss compression; rate equations; relaxation oscillation; second-order harmonic distortion; third-order harmonic distortion; Absorption; Costs; Distributed feedback devices; Gratings; Harmonic distortion; Laser feedback; Laser modes; Laser noise; Laser theory; Optical materials;
Journal_Title :
Selected Topics in Quantum Electronics, IEEE Journal of
DOI :
10.1109/2944.788406
