Open AccessExperimental investigation of wavelength-selective optical feedback for a high-power quantum dot superluminescent device with two-section structure
Author(s) -
Xinkun Li,
Peng Jin,
Q. An,
ZuoCai Wang,
Xueqin Lv,
He Wei,
Wu Jian,
Ju Wu,
Zhanguo Wang
Publication year - 2012
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.20.011936
Subject(s) - superluminescent diode , optics , optoelectronics , quantum dot , optical power , wavelength , broadband , diode , physics , waveguide , bandwidth (computing) , materials science , laser , telecommunications , computer science
In this work, a high-power and broadband quantum dot superluminescent diode (QD-SLD) is achieved by using a two-section structure. The QD-SLD device consists of a tapered titled ridge waveguide section supplying for high optical gain and a straight titled ridge waveguide section to tune optical feedback from the rear facet of the device. The key point of our design is to achieve the wavelength-selective optical feedback to the emission of the QDs' ground state (GS) and 1st excited state (ES) by tuning the current densities injected in the straight titled section. With GS-dominant optical feedback under proper current-injection of the straight titled region, a high output power of 338 mW and a broad bandwidth of 65 nm is obtained simultaneously by the contribution associated to the QDs' GS and 1st ES emission.