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dc.contributorDepartment of Electronic and Information Engineeringen_US
dc.contributor.advisorLu, Chao (EIE)en_US
dc.creatorWu, Xiong-
dc.identifier.urihttps://theses.lib.polyu.edu.hk/handle/200/12491-
dc.languageEnglishen_US
dc.publisherHong Kong Polytechnic Universityen_US
dc.rightsAll rights reserveden_US
dc.titleEqualization techniques for short-reach optical fiber communication systemsen_US
dcterms.abstractAs the key enablers of optical fiber communication systems, the technologies of intensity modulation and direct detection (IM/DD) and in-phase and quadrature modulation and coherent detection (IQM/CohD) have been studied extensively in the past 40 years.en_US
dcterms.abstractNowadays, CohD based systems have enabled transmission of up to 100 Tb/s over thousands of kilometers, using advanced signal processing techniques to mitigate various transmission impairments. However, for many applications such as inter-data center interconnections (DCIs), CohD is often too complex to be used. IM/DD is preferred due to its simplicity and low power consumption, but its performance is often limited by chromatic dispersion (CD) and limited component bandwidth.en_US
dcterms.abstractIn order to meet the requirement of inter-DCIs, various solutions have been proposed. These include equalization algorithms in IM/DD systems at the transmitter and receiver, simplifying the structure and digital signal processing (DSP) in IQM/CohD systems, or realization of mode-division multiplexing (MDM) systems. However, significant research effort is still necessary to reach up to 100-km transmission at high data rate.en_US
dcterms.abstractIn view of the above, this thesis focuses on two aspects of powerful equalization algorithms in IM/DD systems with up to 100-km standard single-mode fiber (SSMF) transmissions, and non-singular multi-user constant modulus algorithm (MU-CMA) equalization in mode-division multiplexing (MDM) system. The proposed schemes have been successfully realized experimentally and their dynamic performance has also been evaluated. The IM/DD schemes include iterative and non-iterative pre-electronic dispersion compensations (EDCs) based on the Gerchberg-Saxton algorithm (GSA) and small-signal analysis (SSA), low-complexity post-equalizers with weight sharing (WS), and the joint scheme of combined pulse shaping, nonlinear pre-distortion, and low-complexity post-equalizers. While the MDM scheme applies the proposed 4 x 4 multi-user constant modulus algorithm (MU-CMA) and Kramers–Kronig reception (KKR) to achieve the non-singular MDM transmission with four cylindrical vector (CV) modes and each mode carrying the high-order modulation format of 16-QAM. Overall, the works presented in the thesis shall provide potential solutions to realize short-reach optical fiber communication systems with high speed and good performance.en_US
dcterms.extentxxii, 151 pages : color illustrationsen_US
dcterms.isPartOfPolyU Electronic Thesesen_US
dcterms.issued2023en_US
dcterms.educationalLevelPh.D.en_US
dcterms.educationalLevelAll Doctorateen_US
dcterms.LCSHOptical fiber communicationen_US
dcterms.LCSHOptical communicationsen_US
dcterms.LCSHHong Kong Polytechnic University -- Dissertationsen_US
dcterms.accessRightsopen accessen_US

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Please use this identifier to cite or link to this item: https://theses.lib.polyu.edu.hk/handle/200/12491