TITLE:
High Performance Asymmetric Three Corrugation-Pitch-Modulated DFB Lasers Suitable for Stable Single Longitudinal Mode Operation
AUTHORS:
Qiang Zuo, Jianyi Zhao, Zhihao Wang, Xin Chen, Wen Liu
KEYWORDS:
Corrugation-Pitch-Modulated; Distributed Feedback Laser; Mode Selectivity; Flatness
JOURNAL NAME:
Optics and Photonics Journal,
Vol.3 No.2B,
July
18,
2013
ABSTRACT: This paper presents an optimized asymmetric
three corrugation-pitch-modulated DFB laser (3CPM-DFB) with extremely high mode
selectivity(△αL= 0.97) and low flatness(F = 0.009),
which are two key parameters to indicate the laser’s single longitudinal
mode(SLM) performance. In threshold analysis, the optimization process based on
transfer matrix method is demonstrated to maximize △αLand minimize F simultaneously. In the above-threshold
regime, the evolutions of △αLandlongitudinal distribution of photon density with
injection current are evaluated. More importantly, nanoimprint lithography
which was proved an efficient way to fabricate DFB
gratings can provide completely same simple fabrication procedure for both 3CPM
grating and conventional uniform grating. So the big practical value of
3CPM-DFB can be expected because of its advanced performance and easy
manufacturability.