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Optical frequency comb expansion using mutually injection-locked gain-switched lasers

Lakshmijayasimha, Prajwal orcid logoORCID: 0000-0002-3381-3337, Anandarajah, Prince M. orcid logoORCID: 0000-0001-7335-8044, Landais, Pascal orcid logoORCID: 0000-0002-4807-0695 and Kaszubowska-Anandarajah, Aleksandra orcid logoORCID: 0000-0003-4811-9273 (2021) Optical frequency comb expansion using mutually injection-locked gain-switched lasers. Applied Sciences, 11 (15). ISSN 2076-3417

Abstract
We propose a novel scheme for the expansion and comb densification of gain-switched optical frequency combs (GS-OFC). The technique entails mutual injection locking of two gainswitched lasers with a common master to generate a wider bandwidth OFC. Subsequently, the OFC is further expanded and/or densified using a phase modulator with optimum drive conditions. We experimentally demonstrate the generation of an OFC with 45 highly correlated lines separated by 6.25 GHz with an expansion factor ~3. In addition, operating in comb densification mode, the channel spacing of the OFC is tuned from 6.25 GHz to 390.625 MHz. Finally, a detailed characterization of the lines, across the entire expanded comb, is reported highlighting the excellent spectral purity with linewidths of ~40 kHz, a relative intensity noise better than −152 dB/Hz, and a high degree of phase correlation between the comb lines. The proposed method is simple, highly flexible and the architecture is suitable for photonic integration, all of which make such an OFC extremely attractive for the employment in a multitude of applications.
Metadata
Item Type:Article (Published)
Refereed:Yes
Additional Information:Article number: 7108
Uncontrolled Keywords:optical frequency comb; gain-switched laser; mutually injection-locked lasers
Subjects:Engineering > Optical communication
Physical Sciences > Photonics
Physical Sciences > Semiconductors
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Engineering and Computing > School of Electronic Engineering
Research Initiatives and Centres > Research Institute for Networks and Communications Engineering (RINCE)
Publisher:Optical Society of America
Official URL:https://doi.org/10.3390/app11157108
Copyright Information:© 2021 The Authors.
Funders:Science Foundation Ireland’s(SFI) career development award(15/CDA/3640), Science Foundation Ireland RDF(13/RC/2077_P2)., EnterpriseIreland DTIF(DT20180268)
ID Code:27068
Deposited On:27 Apr 2022 09:46 by Pascal Landais . Last Modified 20 Sep 2023 13:19
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