Open AccessDesign of chirped distributed Bragg reflector for octave-spanning frequency group velocity dispersion compensation in terahertz quantum cascade laser
Author(s) -
Chao Xu,
Dayan Ban
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.013500
Subject(s) - terahertz radiation , optics , group velocity , distributed bragg reflector , octave (electronics) , quantum cascade laser , stopband , cascade , laser , compensation (psychology) , terahertz spectroscopy and technology , materials science , dispersion (optics) , reflector (photography) , fiber bragg grating , group delay and phase delay , distortion (music) , physics , optoelectronics , bandwidth (computing) , telecommunications , band pass filter , computer science , amplifier , light source , chemistry , chromatography , psychology , cmos , psychoanalysis
The strategies and approaches of designing chirped Distributed Bragg Reflector for group velocity compensation in metal-metal waveguide terahertz quantum cascade laser are investigated through 1D and 3D models. The results show the depth of the corrugation periods plays an important role on achieving broad-band group velocity compensation in terahertz range. However, the deep corrugation also brings distortion to the group delay behavior. A two-section chirped DBR is proposed to provide smoother group delay compensation while still maintain the broad frequency range (octave) operation within 2 THz to 4 THz.