Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor | Department of Electrical and Electronic Engineering | en_US |
| dc.contributor.advisor | Lu, Chao (EEE) | en_US |
| dc.creator | Zhang, Jianbo | - |
| dc.identifier.uri | https://theses.lib.polyu.edu.hk/handle/200/12666 | - |
| dc.language | English | en_US |
| dc.publisher | Hong Kong Polytechnic University | en_US |
| dc.rights | All rights reserved | en_US |
| dc.title | High capacity short-reach optical transmission system based on fiber-eigenmode multiplexing | en_US |
| dcterms.abstract | The fast development of bandwidth-hungry services is catalyzing the explosion of data in the current information and artificial intelligence (AI) era. Accordingly, the meteoric-growth capacity requirement has brought out the need to continuously accelerate the transmission rate to keep pace with the rapid-increasing traffic flow. Modedivision multiplexing (MDM), as an implementation of space-division multiplexing (SDM) technologies, is regarded as a promising solution to cope with the capacity crisis in fiber-based communication systems. Potentially, MDM can significantly increase the capacity of optical systems by multiplying the capacity of a single-mode fiber by the number of co-transmitted modes. Vector modes (VMs) are the full-vectorial eigenmodes supported by circular-core fibers. As true fiber-eigenmodes, VM-based MDM fiber transmission has captured much research interest recently. This thesis focuses on the studies of VM-based MDM short-reach optical transmission. | en_US |
| dcterms.abstract | The primary characteristic of fiber eigenmode is first investigated based on the high-order Poincaré sphere model. Then, the propagation characteristic of VM through free space and few-mode fiber (FMF) is studied. For free-space optical (FSO) transmission, the travel behavior of four VMs multiplexing-based link is evaluated under three atmospheric turbulence conditions. For FMF transmission, VM characteristic along the FMF transmission is simulated and presented. | en_US |
| dcterms.abstract | Based on VMs, two types of MDM short-reach fiber links, including uni-directional and bi-directional transmissions are demonstrated. For uni-directional transmission, two MDM links over 5 km FMF, including two VMs of the same order multiplexing transmission with 360 Gbit/s total capacity and two VMs of different orders multiplexing transmission with 400 Gbit/s total capacity are demonstrated based on Kramers-Kronig (KK) receiver, respectively. For bi-directional transmission, two MDM full-duplex bi-directional architectures including symmetrical and asymmetrical transmissions based on dual-VMs multiplexing over 3 km FMF are respectively implemented based on coherent detection and 2 × 2 MIMO. Firstly, four VMs, each carrying 14 GBaud quadrature phase-shift keying (QPSK) signal, is simultaneously employed on two terminals and a 224 Gbit/s homo-modal bi-directional transmission is demonstrated. To strengthen the immunity against backscattering crosstalk, hetero-modal bidirectional transmission is proposed, in which two VMs of l = 0 and two VMs of l = +2 are respectively utilized in the uplink and downlink and a 448 Gbit/s bi-directional transmission with 28 GBaud 16-ary quadrature amplitude modulation (QAM) modulation is realized. Furthermore, by combining with WDM technology, a 1.792 Tbit/s VM-based WDM-MDM full-duplex bi-directional transmission is also achieved. | en_US |
| dcterms.abstract | Next, a versatile scheme of MG filter for mode-group division multiplexing (MGDM) IM/DD transmission is proposed and experimentally demonstrated over 5 km FMF in a 152 Gbit/s MIMO-free IM/DD MGDM dual-channel simultaneous transmission and detection system. The bit error ratios (BERs) of each channel are below 7% hard-decision forward error correction (HD-FEC) threshold under both static and dynamic tests. Finally, unlike most MIMO-based SDM/MDM demonstrations without consideration of singular problems, non-Singular MIMO DSP based on multi-user constant modulus algorithm (MU-CMA) is implemented on the four-VMs-multiplexed KK reception system with an aggregate rate of 448 Gbit/s. None of the singular phenomena is observed under both static and dynamic performance evaluation. | en_US |
| dcterms.extent | xxvi, 119 pages : color illustrations | en_US |
| dcterms.isPartOf | PolyU Electronic Theses | en_US |
| dcterms.issued | 2023 | en_US |
| dcterms.educationalLevel | Ph.D. | en_US |
| dcterms.educationalLevel | All Doctorate | en_US |
| dcterms.LCSH | Optical communications | en_US |
| dcterms.LCSH | Fiber optics | en_US |
| dcterms.LCSH | Hong Kong Polytechnic University -- Dissertations | en_US |
| dcterms.accessRights | open access | en_US |
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