Stabilization of self-mode-locked quantum dash lasers by symmetric dual-loop optical feedback

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dc.contributor.authorAsghar, Haroon
dc.contributor.authorWei, Wei
dc.contributor.authorKumar, Pramod
dc.contributor.authorSooudi, Ehsan
dc.contributor.authorMcInerney, John G.
dc.contributor.funderScience Foundation Irelanden
dc.contributor.funderInternational Science and Technology Centeren
dc.date.accessioned2018-02-26T15:38:08Z
dc.date.available2018-02-26T15:38:08Z
dc.date.issued2018-02-13
dc.date.updated2018-02-26T15:24:02Z
dc.description.abstractWe report experimental studies of the influence of symmetric dual-loop optical feedback on the RF linewidth and timing jitter of self-mode-locked two-section quantum dash lasers emitting at 1550 nm. Various feedback schemes were investigated and optimum levels determined for narrowest RF linewidth and low timing jitter, for single-loop and symmetric dual-loop feedback. Two symmetric dual-loop configurations, with balanced and unbalanced feedback ratios, were studied. We demonstrate that unbalanced symmetric dual loop feedback, with the inner cavity resonant and fine delay tuning of the outer loop, gives the narrowest RF linewidth and reduced timing jitter over a wide range of delay, unlike single and balanced symmetric dual-loop configurations. This configuration with feedback lengths of 80 and 140 m narrows the RF linewidth by ∼ 4–67x and ∼ 10–100x, respectively, across the widest delay range, compared to free-running. For symmetric dual-loop feedback, the influence of different power split ratios through the feedback loops was determined. Our results show that symmetric dual-loop feedback is markedly more effective than single-loop feedback in reducing RF linewidth and timing jitter, and is much less sensitive to delay phase, making this technique ideal for applications where robustness and alignment tolerance are essential.en
dc.description.sponsorshipInternational Science and Technology Center (European Office of Aerospace Research and Development (grant FA9550-14-1-0204))en
dc.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationAsghar, H., Wei, W., Kumar, P., Sooudi, E. and McInerney, J. G. (2018) 'Stabilization of self-mode-locked quantum dash lasers by symmetric dual-loop optical feedback', Optics Express, 26(4), pp. 4581-4592. doi: 10.1364/OE.26.004581en
dc.identifier.doi10.1364/OE.26.004581
dc.identifier.endpage4592en
dc.identifier.issn1094-4087
dc.identifier.issued4en
dc.identifier.journaltitleOptics Expressen
dc.identifier.startpage4581en
dc.identifier.urihttps://hdl.handle.net/10468/5546
dc.identifier.volume26en
dc.language.isoenen
dc.publisherOptical Society of Americaen
dc.relation.projectinfo:eu-repo/grantAgreement/SFI/SFI Investigator Programme/12/IP/1658/IE/Pulsed semiconductor lasers for metrology and remote sensing: synchronisation and stabilisation dynamics/en
dc.relation.urihttp://www.opticsexpress.org/abstract.cfm?URI=oe-26-4-4581
dc.rights© 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.en
dc.subjectMode-locked lasersen
dc.subjectFluctuations, relaxations, and noiseen
dc.subjectLaser stabilizationen
dc.titleStabilization of self-mode-locked quantum dash lasers by symmetric dual-loop optical feedbacken
dc.typeArticle (peer-reviewed)en
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