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Modal Dispersion in Multi-Mode Fiber Systems: the Benefits and Challenges of Mode Coupling
Modal Dispersion in Multi-Mode Fiber Systems: the Benefits and Challenges of Mode Coupling
Detailed Information
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105608
- ISBN
- 9798265426574
- DDC
- 000
- 저자명
- Vijay, Anirudh.
- 서명/저자
- Modal Dispersion in Multi-Mode Fiber Systems: the Benefits and Challenges of Mode Coupling
- 발행사항
- [Sl] : Stanford University, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 185 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-05, Section: B.
- 주기사항
- Advisor: Kahn, Joseph.
- 학위논문주기
- Thesis (Ph.D.)--Stanford University, 2025.
- 초록/해제
- 요약Multiplexing in spatial modes complements multiplexing in wavelength, time, quadrature, and polarization, thus enabling greater capacity in fiber-optic communication systems. As data throughput scales linearly with the number of propagating modes, mode-division multiplexing (MDM) in multi-mode fibers (MMFs) has emerged as a key approach for high-capacity transmission, with promising potential for future systems. In MDM-MMF, signals on different modes couple during propagation, necessitating multi-input multi-output (MIMO) signal processing for effective recovery. Additionally, unequal group delays among modes lead to modal dispersion, requiring frequency-dependent MIMO processing.This dissertation explores two types of MDM systems using graded-index MMFs and architectures for managing modal dispersion: short-reach systems (hundreds of meters to a few kilometers) with direct-detection (DD) on installed OM MMFs, and long-haul submarine systems (thousands of kilometers) with coherent detection in MMFs. A central theme of this dissertation is the dual role of mode coupling-beneficial in some cases, yet detrimental in others. In short-reach DD MDM systems, modal dispersion can be mitigated by transmitting signals over principal modes, which are eigenfunctions of a group-delay operator. We demonstrate that adaptive principal-mode transmission is feasible using optical signal processing via Mach-Zehnder interferometer meshes, thereby mitigating a frequency-dependent effect using frequency-independent signal processing. The effectiveness of this approach is limited by higher-order modal dispersion, which arises from the interaction between strong random mode coupling and dispersion.In long-haul MDM systems, strong random mode coupling helps reduce the accumulation of modal dispersion and mode-dependent loss. Modes in graded-index MMFs tend to form groups, exhibiting strong random intra-group coupling and weak random inter-group coupling in the presence of index perturbations. Periodic mode scrambling or permutation can be applied to enhance inter-group coupling. This dissertation presents an analytical study of modal statistics in MMF links with periodic scrambling or permutation, highlighting a set of robust design criteria for achieving strong random coupling across all modes. The study also reveals a group-delay self-compensation regime in which engineered deterministic inter-group coupling can interchange signals between the fastest and slowest mode groups, achieving a group-delay spread smaller than that of strong random coupling alone. Maximizing the effectiveness of self-compensation requires co-designing both the transmission fiber and permutation device. Finally, we propose system architectures based on group-delay compensation using one or two fiber types, mode scramblers, and mode permuters. The role of random inter-group coupling in modal dispersion management varies-beneficial for the mode-scrambling approach but detrimental for the delay-compensation approach.
- 일반주제명
- Transmitters
- 일반주제명
- Fourier transforms
- 일반주제명
- Communication
- 일반주제명
- Bandwidths
- 일반주제명
- Signal processing
- 일반주제명
- Electrical engineering
- 일반주제명
- Mathematics
- 기타저자
- Stanford University.
- 기본자료저록
- Dissertations Abstracts International. 87-05B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■020 ▼a9798265426574
■035 ▼a(MiAaPQ)AAI32316368
■035 ▼a(MiAaPQ)Stanfordbn477mz2430
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a000
■1001 ▼aVijay, Anirudh.
■24510▼aModal Dispersion in Multi-Mode Fiber Systems: the Benefits and Challenges of Mode Coupling
■260 ▼a[Sl]▼bStanford University▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a185 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-05, Section: B.
■500 ▼aAdvisor: Kahn, Joseph.
■5021 ▼aThesis (Ph.D.)--Stanford University, 2025.
■520 ▼aMultiplexing in spatial modes complements multiplexing in wavelength, time, quadrature, and polarization, thus enabling greater capacity in fiber-optic communication systems. As data throughput scales linearly with the number of propagating modes, mode-division multiplexing (MDM) in multi-mode fibers (MMFs) has emerged as a key approach for high-capacity transmission, with promising potential for future systems. In MDM-MMF, signals on different modes couple during propagation, necessitating multi-input multi-output (MIMO) signal processing for effective recovery. Additionally, unequal group delays among modes lead to modal dispersion, requiring frequency-dependent MIMO processing.This dissertation explores two types of MDM systems using graded-index MMFs and architectures for managing modal dispersion: short-reach systems (hundreds of meters to a few kilometers) with direct-detection (DD) on installed OM MMFs, and long-haul submarine systems (thousands of kilometers) with coherent detection in MMFs. A central theme of this dissertation is the dual role of mode coupling-beneficial in some cases, yet detrimental in others. In short-reach DD MDM systems, modal dispersion can be mitigated by transmitting signals over principal modes, which are eigenfunctions of a group-delay operator. We demonstrate that adaptive principal-mode transmission is feasible using optical signal processing via Mach-Zehnder interferometer meshes, thereby mitigating a frequency-dependent effect using frequency-independent signal processing. The effectiveness of this approach is limited by higher-order modal dispersion, which arises from the interaction between strong random mode coupling and dispersion.In long-haul MDM systems, strong random mode coupling helps reduce the accumulation of modal dispersion and mode-dependent loss. Modes in graded-index MMFs tend to form groups, exhibiting strong random intra-group coupling and weak random inter-group coupling in the presence of index perturbations. Periodic mode scrambling or permutation can be applied to enhance inter-group coupling. This dissertation presents an analytical study of modal statistics in MMF links with periodic scrambling or permutation, highlighting a set of robust design criteria for achieving strong random coupling across all modes. The study also reveals a group-delay self-compensation regime in which engineered deterministic inter-group coupling can interchange signals between the fastest and slowest mode groups, achieving a group-delay spread smaller than that of strong random coupling alone. Maximizing the effectiveness of self-compensation requires co-designing both the transmission fiber and permutation device. Finally, we propose system architectures based on group-delay compensation using one or two fiber types, mode scramblers, and mode permuters. The role of random inter-group coupling in modal dispersion management varies-beneficial for the mode-scrambling approach but detrimental for the delay-compensation approach.
■590 ▼aSchool code: 0212.
■650 4▼aTransmitters
■650 4▼aFourier transforms
■650 4▼aCommunication
■650 4▼aBandwidths
■650 4▼aSignal processing
■650 4▼aElectrical engineering
■650 4▼aMathematics
■690 ▼a0459
■690 ▼a0544
■690 ▼a0405
■71020▼aStanford University.
■7730 ▼tDissertations Abstracts International▼g87-05B.
■790 ▼a0212
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360707▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
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