Open AccessDesign and simulation of two-section DFB lasers with short active-section lengths
Author(s) -
Gongyuan Zhao,
Junqiang Sun,
Yanping Xi,
Dingshan Gao,
Qiaoyin Lu,
Weihua Guo
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.24.010590
Subject(s) - optics , bandwidth (computing) , laser , section (typography) , reflection (computer programming) , materials science , semiconductor laser theory , active layer , optoelectronics , physics , computer science , telecommunications , layer (electronics) , programming language , operating system , thin film transistor , composite material
Distributed feedback lasers comprised of a reflection section and an active section have been proposed for high direct-modulation bandwidth. The reflection section has the same core layer as the active section so butt-joint re-growth is avoided. Without current injection the reflection section will be pumped to near transparency by the emission from the laser itself so high reflection (> 0.75) can still be achieved as confirmed by the simulation. Therefore a short (150 µm) active section can be used, which enables a low threshold current (~5 mA) and a high direct modulation bandwidth (>30 GHz) as demonstrated by the simulation.