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Title: Modal gain characteristics of a two-section InGaAs/GaAs double quantum well passively mode-locked laser with asymmetric waveguide
Authors: Qiao, Zhongliang
Li, Xiang
Sia, Brian Jia Xu
Wang, Wanjun
Wang, Hong
Li, Zaijin
Zhao, Zhibin
Li, Lin
Gao, Xin
Bo, Baoxue
Qu, Yi
Liu, Guojin
Liu, Chongyang
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2022
Source: Qiao, Z., Li, X., Sia, B. J. X., Wang, W., Wang, H., Li, Z., Zhao, Z., Li, L., Gao, X., Bo, B., Qu, Y., Liu, G. & Liu, C. (2022). Modal gain characteristics of a two-section InGaAs/GaAs double quantum well passively mode-locked laser with asymmetric waveguide. Scientific Reports, 12(1), 5010-.
Project: NRF-CRP12-2013-04 
Journal: Scientific Reports 
Abstract: Monolithic two-section InGaAs/GaAs double quantum well (DQW) passively mode-locked lasers (MLLs) with asymmetric waveguide, consisting of the layers of p-doped AlGaAs waveguide and no-doped InGaAsP waveguide, emitting at ~ 1.06 μm, with a fundamental repetition rate at ~ 19.56 GHz have been demonstrated. Modal gain characteristics, such as a gain bandwidth and a gain peak wavelength of the MLL, as a function of the saturable absorber (SA) bias voltage (Va) as well as the injection current of gain section (Ig), were investigated by the Hakki-Paoli method. With the increase of Va, the lasing wavelength and net modal gain peak of the MLL both exhibited red-shifts to longer wavelength significantly, while the modal gain bandwidth was narrowed. Both the net modal gain bandwidth and gain peak of the MLL followed a polynomial distribution versus the reverse bias at the absorber section. In addition, for the first time, it was found that Va had an obvious effect on the modal gain characteristics of the MLL.
ISSN: 2045-2322
DOI: 10.1038/s41598-022-09136-6
Schools: School of Electrical and Electronic Engineering 
Research Centres: Temasek Laboratories @ NTU 
Rights: © 2022 The Author(s). This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit
Fulltext Permission: open
Fulltext Availability: With Fulltext
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