Title :
Analysis of surface-emitting lambda /4-shifted DFB lasers with a distributed Bragg reflector
Author_Institution :
Bell-Northern Res. Ltd., Ottawa, Ont., Canada
Abstract :
Threshold current density and differential quantum efficiency are analyzed for a surface emitting (SE) lambda /4-shifted distributed feedback (DFB) laser consisting of alternating active and passive layers with a distributed Bragg reflector (DBR). It is shown that the threshold current density can be reduced by using the DFB action induced by alternating active and passive layers in the active region of the SE DFB laser structure, as compared to SE DBR lasers with a homogeneous active region. It is also shown that the differential quantum efficiency of the DFB laser with a DBR can be higher than that of conventional DBR lasers without increasing the threshold current density.<>
Keywords :
distributed Bragg reflector lasers; distributed feedback lasers; laser theory; semiconductor junction lasers; DFB laser; active layers; differential quantum efficiency; distributed Bragg reflector; distributed feedback; homogeneous active region; passive layers; surface-emitting lambda /4-shifted DFB lasers; threshold current density; Distributed Bragg reflectors; Distributed feedback devices; Fiber lasers; Laser feedback; Optical refraction; Optical surface waves; Semiconductor laser arrays; Surface emitting lasers; Threshold current; Vertical cavity surface emitting lasers;
Journal_Title :
Photonics Technology Letters, IEEE
