Low-linewidth optical comb sources based on gain-switched lasers

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dc.contributor.advisor Peters, Frank H. en
dc.contributor.advisor Corbett, Brian en
dc.contributor.author Alexander, Justin K.
dc.date.accessioned 2018-02-16T09:55:31Z
dc.date.available 2018-02-16T09:55:31Z
dc.date.issued 2017
dc.date.submitted 2017
dc.identifier.citation Alexander, J. K. 2017. Low-linewidth optical comb sources based on gain-switched lasers. PhD Thesis, University College Cork. en
dc.identifier.endpage 127 en
dc.identifier.uri http://hdl.handle.net/10468/5467
dc.description.abstract As the number of internet users continues to grow, along with the increase in bandwidth demanding services, the optical communications network struggles to keep up. Upgrading the optical fibre network is a costly endeavour, therefore research into spectrally efficient communication methods must be performed to combat the year-on-year increase in bandwidth demand. Long-haul communications has typically relied on wavelength division multiplexing (WDM) to transmit multiple optical carriers through a single fibre. Each wavelength carrier must be separated by a guard band to reduce interference between channels. By moving to a coherent set of carriers, these guard bands can be reclaimed as usable bandwidth. Optical superchannels, which consist of several sub-carriers, can be used to increase the information spectral density (Gbps/Hz). An even greater increase in the information spectral density can be achieved by implementing all-optical orthogonal frequency division multiplexing (AO-OFDM). Coherent communications systems, such as AO-OFDM, require a coherent optical comb source as a fundamental component. The work presented in this thesis investigates several device designs for the generation of optical combs based on gain-switched slotted Fabry-Pérot lasers. The semiconductor rate equations were used to analyse the phase noise properties of a gain-switched single mode laser both with and without optical injection-locking. Phase noise was shown to increase with gain-switching, and decrease when the gain-switched laser was injection-locked to a low linewidth master laser. Photonic integration was used to integrate two lasers on a single chip for the purpose of generating a low linewidth optical comb. Optical combs with linewidths in the region of 300 kHz were generated, with a comb line spacing of up to 10 GHz demonstrated. The versatile design of these comb sources show promise for further integration with splitters and modulators to facilitate the development of an AO-OFDM transmitter photonic integrated circuit (PIC). Such a PIC is essential in meeting the future bandwidth demands of the optical communications network. en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher University College Cork en
dc.rights © 2017, Justin K. Alexander. en
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/ en
dc.subject Photonics en
dc.subject Photonic integration en
dc.subject Optical comb en
dc.subject Gain-switching en
dc.subject Laser en
dc.subject Semiconductor en
dc.title Low-linewidth optical comb sources based on gain-switched lasers en
dc.type Doctoral thesis en
dc.type.qualificationlevel Doctoral en
dc.type.qualificationname PhD (Science) en
dc.internal.availability Full text available en
dc.check.info No embargo required en
dc.description.version Accepted Version
dc.contributor.funder Science Foundation Ireland en
dc.description.status Not peer reviewed en
dc.internal.school Physics en
dc.internal.school Tyndall National Institute en
dc.check.type No Embargo Required
dc.check.reason No embargo required en
dc.check.opt-out Not applicable en
dc.thesis.opt-out false
dc.check.embargoformat Not applicable en
ucc.workflow.supervisor f.peters@ucc.ie
dc.internal.conferring Spring 2018 en
dc.relation.project info:eu-repo/grantAgreement/SFI/SFI Research Centres/12/RC/2276/IE/I-PIC Irish Photonic Integration Research Centre/ en

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