Spectrally-sliced optical receiver for coherent passive optical networks

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dc.contributor.advisorTownsend, Paul D.
dc.contributor.advisorAntony, Cleitus
dc.contributor.advisorOuyang, Xing
dc.contributor.authorOthman, Muhammad Hilmien
dc.contributor.funderScience Foundation Irelanden
dc.date.accessioned2025-05-09T14:12:27Z
dc.date.available2025-05-09T14:12:27Z
dc.date.issued2024en
dc.date.submitted2024en
dc.description.abstractThe recent popularity of bandwidth-intensive applications, such as high definition video streaming, virtual reality, and augmented reality generative platforms, has resulted in a huge demand for higher data transmission speeds over the telecommunication network based on optical fiber. As the line rates of the access network move toward 100 Gbit/s and beyond, legacy intensity modulation with direct detection will struggle to continue to support high-link power budgets and distances. Meanwhile, digital coherent optics opens up clear improvements for the next-generation access network and easily meets the highspeed, power budget, and distance requirements. However, significant challenges must be addressed to make such technology suitable for the cost-sensitive access network, such as redesigning and minimizing the cost of the technology. In particular, the complexity of the coherent transceiver design is compounded by the need for expensive broad-analog-bandwidth components, which is an obstacle to the deployment of high-bitrate coherent technology for the nextgeneration access network. This could be potentially addressed with the optical spectral slicing technique, which would allow the utilization of high-volume and low-cost commodity receiver components. Hence, this dissertation focuses on the development of a spectrally sliced coherent receiver, which enables the parallel coherent detection of a wideband optical waveform in the frequency domain. By harnessing the lowcost manufacturing potential of maturing photonic integration technologies such as silicon photonics and micro-transfer printing, together with the bandwidth reduction capability of spectral slicing, new opportunities for the application of coherent communication technology in future access network systems may be realized. The objectives of this dissertation encompass the investigation and validation of spectrally sliced detection design, and receiver performance in the context of an optical access network. This work successfully demonstrates a spectrally sliced receiver with high optical receiving sensitivity operating over 40 km of optical fiber employing 100 Gb/s dual-polarization modulation. In addition, the author has demonstrated that the bandwidth requirements in the optical receiver component can be significantly reduced by a factor corresponding to the number of slices implemented. Overall, the technical contribution presented in this dissertation provides a series of analytical and experimental research studies on parameter requirements of the optical frequency comb as well as the reconstruction signal processing; which are the two main components in the proposed receiver design. However, since the receiver must address the challenge of scaling economics in the access network, the digital, electrical, and optical complexity must be minimized. To this end, the author has incorporated a monolithically integrated comb source and an active demultiplexer with the proposed detection scheme, which leverages the great potential of the photonic integrated circuit to reduce the size and cost. These are pragmatic and important steps to pave the route towards a low-cost, fully integrated spectrally sliced system. To the best the author knowledge, the works presented here represent the first spectral-slicing demonstrations in the context of access network. Finally, the author discusses some of the prospective research directions and the interesting challenges that arise for the proposed receiver that can be implemented in future access network applications.en
dc.description.statusNot peer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationOthman, M. H. 2024. Spectrally-sliced optical receiver for coherent passive optical networks. PhD Thesis, University College Cork.en
dc.identifier.endpage127en
dc.identifier.urihttps://hdl.handle.net/10468/17409
dc.language.isoenen
dc.publisherUniversity College Corken
dc.relation.projectinfo:eu-repo/grantAgreement/SFI/SFI Research Centres/12/RC/2276/IE/I-PIC Irish Photonic Integration Research Centre/en
dc.rights© 2024, Hilmi Othman.en
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectOptical fiber communicationen
dc.subjectCoherent opticsen
dc.subjectSpectrally-sliceden
dc.titleSpectrally-sliced optical receiver for coherent passive optical networksen
dc.typeDoctoral thesisen
dc.type.qualificationlevelDoctoralen
dc.type.qualificationnamePhD - Doctor of Philosophyen
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