Login (DCU Staff Only)
Login (DCU Staff Only)

DORAS | DCU Research Repository

Explore open access research and scholarly works from DCU

Advanced Search

Characterization of 60 GHz multi quantum well passively mode-locked laser under optical self-injection locking

Shahzad, Asim, Zafrullah, Muhammad, Khawar Islam, Muhammad, Maldonado-Basilio, Ramón, Carney, Kevin and Landais, Pascal orcid logoORCID: 0000-0002-4807-0695 (2013) Characterization of 60 GHz multi quantum well passively mode-locked laser under optical self-injection locking. Optik, 125 (4). pp. 1517-1521. ISSN 0030-4026

The quality and pulse compression of the 60 GHz millimeter wave signals generated by 750 m long InAlGaAs Multi Quantum Well (MQW) passively mode locked laser under free running and optical self-injection locked conditions are experimentally characterized in terms of longitudinal modes under certain bias currents that range from 24 mA to 90 mA. Initially, the MQW laser is characterized in free running condition with no external injection. The measurements reflect that the free spectral range of laser under test is around 61 GHz and exhibit more than 22 lasing modes. The laser is then integrated into low phase noise self-injection locking oscillator by feeding a part of output RF signal back into the laser cavity to enhance passive mode locking. By doing so the microwave line width of our laser is reduced from 900 kHz to 24 kHz with significant increase in output of resultant beat tones which exhibits strong passive mode locking. This is the first time that the free running microwave line width of MQW laser is reduced up to this level. It is evident from our experimental investigation that as we increase the power and phase correlation between different longitudinal modes inside laser cavity through optical self-injection, the strength of the passively mode locked mechanism is significantly increased and the phase noise of radio frequency signal is drastically reduced.
Item Type:Article (Published)
Uncontrolled Keywords:Multi Quantum well laser; Microwave generation; Passive mode locking; Pulse compression; Optical self-injection locking
Subjects:Engineering > Optical communication
Physical Sciences > Lasers
Physical Sciences > Semiconductors
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Engineering and Computing > School of Electronic Engineering
Research Institutes and Centres > Research Institute for Networks and Communications Engineering (RINCE)
Official URL:http://dx.doi.org/10.1016/j.ijleo.2013.05.022
Copyright Information:© 2013 Elsevier. Open Access
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
ID Code:24862
Deposited On:24 Jul 2020 13:22 by Pascal Landais . Last Modified 03 Sep 2020 10:37

Full text available as:

[thumbnail of 1-s2.0-S0030402613006852-main.pdf]
PDF - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader


Downloads per month over past year

Archive Staff Only: edit this record