Properties and applications of injection locking in 1.55 μm quantum-dash mode-locked semiconductor lasers

dc.check.embargoformatNot applicableen
dc.check.infoNo embargo requireden
dc.check.opt-outNot applicableen
dc.check.reasonNo embargo requireden
dc.check.typeNo Embargo Required
dc.contributor.advisorMcInerney, John G.en
dc.contributor.authorSooudi, Ehsan
dc.contributor.funderScience Foundation Irelanden
dc.contributor.funderEuropean Commissionen
dc.date.accessioned2013-12-19T17:06:46Z
dc.date.available2013-12-19T17:06:46Z
dc.date.issued2013
dc.date.submitted2013
dc.description.abstractMode-locked semiconductor lasers are compact pulsed sources with ultra-narrow pulse widths and high repetition-rates. In order to use these sources in real applications, their performance needs to be optimised in several aspects, usually by external control. We experimentally investigate the behaviour of recently-developed quantum-dash mode-locked lasers (QDMLLs) emitting at 1.55 μm under external optical injection. Single-section and two-section lasers with different repetition frequencies and active-region structures are studied. Particularly, we are interested in a regime which the laser remains mode-locked and the individual modes are simultaneously phase-locked to the external laser. Injection-locked self-mode-locked lasers demonstrate tunable microwave generation at first or second harmonic of the free-running repetition frequency with sub-MHz RF linewidth. For two-section mode-locked lasers, using dual-mode optical injection (injection of two coherent CW lines), narrowing the RF linewidth close to that of the electrical source, narrowing the optical linewidths and reduction in the time-bandwidth product is achieved. Under optimised bias conditions of the slave laser, a repetition frequency tuning ratio >2% is achieved, a record for a monolithic semiconductor mode-locked laser. In addition, we demonstrate a novel all-optical stabilisation technique for mode-locked semiconductor lasers by combination of CW optical injection and optical feedback to simultaneously improve the time-bandwidth product and timing-jitter of the laser. This scheme does not need an RF source and no optical to electrical conversion is required and thus is ideal for photonic integration. Finally, an application of injection-locked mode-locked lasers is introduced in a multichannel phase-sensitive amplifier (PSA). We show that with dual-mode injection-locking, simultaneous phase-synchronisation of two channels to local pump sources is realised through one injection-locking stage. An experimental proof of concept is demonstrated for two 10 Gbps phase-encoded (DPSK) channels showing more than 7 dB phase-sensitive gain and less than 1 dB penalty of the receiver sensitivity.en
dc.description.sponsorshipScience Foundation Ireland (Contracts: 07/IN.1/I929, 07/RFP/ENE643); European Commission ( FP7 PROPHET project, Grant No. 264687. FP7 grant 224547 (PHASORS) Marie Curie Action FP7-PEOPLE-2010-ITN)en
dc.description.statusNot peer revieweden
dc.description.versionAccepted Version
dc.format.mimetypeapplication/pdfen
dc.identifier.citationSooudi, E. 2013. Properties and applications of injection locking in 1.55 μm quantum-dash mode-locked semiconductor lasers. PhD Thesis, University College Cork.en
dc.identifier.endpage136
dc.identifier.urihttps://hdl.handle.net/10468/1292
dc.language.isoenen
dc.publisherUniversity College Corken
dc.rights© 2013, Ehsan Sooudi.en
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/en
dc.subjectChirpen
dc.subjectOptical injectionen
dc.subjectInjection-lockingen
dc.subjectOptical frequency combsen
dc.subjectMicrowave generationen
dc.subjectTiming jitteren
dc.subjectQuantum dot lasersen
dc.subjectSemiconductor mode-locked lasersen
dc.subjectQuantum-dash lasersen
dc.subjectPhase-sensitive amplifiersen
dc.subjectOptical feedbacken
dc.subject.lcshSemiconductor lasersen
dc.subject.lcshOptical communicationsen
dc.thesis.opt-outfalse
dc.titleProperties and applications of injection locking in 1.55 μm quantum-dash mode-locked semiconductor lasersen
dc.typeDoctoral thesisen
dc.type.qualificationlevelDoctoralen
dc.type.qualificationnamePhD (Science)en
ucc.workflow.supervisorj.mcinerney@ucc.ie
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