Direct Detection And Self Coherent Detection Short Reach Optical Communication Systems For Data Center Networking
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Direct Detection And Self Coherent Detection Short Reach Optical Communication Systems For Data Center Networking
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Author : Zhenping Xing
language : en
Publisher:
Release Date : 2021
Direct Detection And Self Coherent Detection Short Reach Optical Communication Systems For Data Center Networking written by Zhenping Xing and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with categories.
"In this thesis, we aim at exploring the potentials and the limits of O-band intensity modulation direct detection (IM/DD) systems and C-band single sideband (SSB)/vestigial sideband (VSB) self-coherent detection systems for data center networking applications based on current technologies and advanced DSP algorithms. For the O-band IM/DD system, we start from a 400 Gb/s 4-[lambda] coarse wavelength division multiplexing (CWDM4) 4-level pulse amplitude modulation (PAM4) transmission system based on a commercial transmitter optical sub-assembly (TOSA). We experimentally show that by using faster-than-Nyquist (FTN) technologies, we can increase the total net rate to 600 Gb/s at 2 km and 10 km. We also propose a wavelength-interleaved four dimensional-PAM4-trellis coded modulation (4D-PAM4-TCM) scheme to improve the system's robustness against channel performance discrepancies caused by inter-channel component differences and the impacts of CD-chirp interactions. We experimentally show that the proposed scheme outperforms the conventional time-domain encoded 4D-PAM4-TCM scheme. The SSB/VSB self-coherent detection system can be regarded as an upgrade of the IM/DD system, which slightly increases the hardware complexity and the DSP complexity to acquire CD compensation capability. In this thesis, we first focus on experimental studies of amplified VSB self-coherent systems using silicon photonic (SiPh) devices. We demonstrate 100 Gb/s PAM4 transmissions over 40-80 km using a digital-to-analog converter (DAC)-less transmitter based on a SiPh multi-electrode Mach Zehnder modulator (MZM) and a VSB receiver. We also propose a filter-response aware iterative Kramers Kronig (FA-iter-KK) algorithm to replace the conventional field reconstruction algorithms in a VSB system, which utilizes the frequency response of the optical filter to improve the accuracy of the field reconstruction process in the presence of the residual sideband. We further demonstrate a tunable power splitter based parallel path structure on the SiPh platform to control the carrier-to-signal power ratio (CSPR) in a VSB system. In addition, we numerically study the transmission performance and the power consumption of IQ modulator based SSB systems and single MZM based VSB systems in unamplified loss limited links over 40 km. We compare the best achievable performance of two CSPR control schemes, i.e. the bias tuning scheme and the parallel path structure based scheme, and we reveal that the choice of the CSPR control scheme depends on the swing of the driving voltage and the half-wave voltage of the modulator. We also compare the power consumption of different SSB/VSB self-coherent detections systems processed with different field reconstruction algorithms, including the FA-iter-KK algorithm we propose. We show that in an IQ modulator based SSB system, the iterative KK algorithm (with one iteration) is the most power efficient algorithm, but a VSB system processed with the FA-iter-KK algorithm (with one iteration) has the potential to achieve an even lower total system power consumption. We think this work can provide some guidance on practical implementations of SSB/VSB self-coherent detection systems"--
Advanced Direct Detection Systems For Data Center Communications
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Author : Xueyang Li
language : en
Publisher:
Release Date : 2022
Advanced Direct Detection Systems For Data Center Communications written by Xueyang Li and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
"There has been a massive IP traffic growth in the data center network in recent years driven by applications such as artificial intelligence and high-definition video streaming. To accommodate the increasing bandwidth demand, the data rates of pluggable optical modules evolve accordingly while meeting the cost and power constraints because of the use of compact form factors such as QSFP-DD. The available detection schemes for such pluggable modules are divided into two kinds, i.e. direct detection (DD) and coherent detection (COHD). The application boundary between these two detection schemes depends on the link distance that needs to be fulfilled. At the 400G throughput node, COHD systems are dominant for longer-reach connections between centralized data centers over metro distances from 40 km to 120 km which requires high-capacity optical interfaces. Note that the greater throughput-distance product of COHD systems comes at the cost of more complex system hardware and higher power consumption compared to DD systems. Thus for shorter-reach connections such as the intra-data center communications below 10 km, DD systems are dominantly deployed because of the cost-effectiveness and low power consumption. To date, there is an ongoing effort in developing simplified COHD systems with lower power consumption to substitute DD systems at shorter connection distances below 40 km. From another perspective, it is also viable to design advanced DD systems having a greater throughput-distance product by means of combining the performance advantages found in COHD systems with the cost-effectiveness of DD systems to cover an extended communication reach up to 40 km and beyond. This objective is accomplished in the thesis by designing novel digital signal processing techniques and subsystem architectures. More specifically, we show that probabilistic shaping (PS), often used in long-haul COHD systems, is an effective technique to improve the throughput of DD systems below 10 km where the fiber channel impairments are marginal. We propose suitable distribution matching schemes to implement PS in short-reach DD systems and optimize the input distribution of PS constellations in practical DD systems by means of a neural network-based performance model. Furthermore, in order to achieve a greater throughput-distance product at an extended transmission reach up to 40 km and beyond as required by the data center interconnects, we propose a set of subsystem structures and relevant DSP algorithms to realize phase-diverse DD systems that approach the throughput of COHD systems given the same receiver electrical bandwidth. The advanced DD systems proposed in the thesis bridge the performance gap between DD systems and COHD systems, and hold promises for realizing high-speed optical links applied in the data center network"--
Advanced Digital Optical Communications
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Author : Le Nguyen Binh
language : en
Publisher: CRC Press
Release Date : 2017-11-22
Advanced Digital Optical Communications written by Le Nguyen Binh and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-11-22 with Technology & Engineering categories.
This second edition of Digital Optical Communications provides a comprehensive treatment of the modern aspects of coherent homodyne and self-coherent reception techniques using algorithms incorporated in digital signal processing (DSP) systems and DSP-based transmitters to overcome several linear and nonlinear transmission impairments and frequency mismatching between the local oscillator and the carrier, as well as clock recovery and cycle slips. These modern transmission systems have emerged as the core technology for Tera-bits per second (bps) and Peta-bps optical Internet for the near future. Featuring extensive updates to all existing chapters, Advanced Digital Optical Communications, Second Edition: Contains new chapters on optical fiber structures and propagation, optical coherent receivers, DSP equalizer algorithms, and high-order spectral DSP receivers Examines theoretical foundations, practical case studies, and MATLAB® and Simulink® models for simulation transmissions Includes new end-of-chapter practice problems and useful appendices to supplement technical information Downloadable content available with qualifying course adoption Advanced Digital Optical Communications, Second Edition supplies a fundamental understanding of digital communication applications in optical communication technologies, emphasizing operation principles versus heavy mathematical analysis. It is an ideal text for aspiring engineers and a valuable professional reference for those involved in optics, telecommunications, electronics, photonics, and digital signal processing.
Coherent Optics For Access Networks
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Author : Zhensheng Jia
language : en
Publisher: CRC Press
Release Date : 2019-10-28
Coherent Optics For Access Networks written by Zhensheng Jia and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-10-28 with Technology & Engineering categories.
This book will highlight the motivation for coherent optics in access and introduce digital coherent optical system in detail, including advanced modulation formats, architecture of modulation and detection, and DSP flow for both transmitter and receiver. This book will also demonstrate potential approaches to re-design and re-engineer the digital coherent concept from long-haul and metro solutions to the access network, leveraging reduction in complexity and cost as well as the benefits of capacity increases and operational improvements. This book will illustrate the details on optimization of the digital, optical, and electrical complexity and standardization and interoperability.
Reach Enhancement In Both Direct Detection And Coherent Detection Optical Fiber Communication Systems
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Author : Charles Sarkis
language : en
Publisher:
Release Date : 2009
Reach Enhancement In Both Direct Detection And Coherent Detection Optical Fiber Communication Systems written by Charles Sarkis and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
Optical Delay Interferometers And Their Application For Self Coherent Detection
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Author : Jingshi Li
language : en
Publisher: KIT Scientific Publishing
Release Date : 2014-07-31
Optical Delay Interferometers And Their Application For Self Coherent Detection written by Jingshi Li and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-07-31 with Technology & Engineering categories.
Self-coherent receivers are promising candidates for reception of 100 Gbit/s data rates in optical networks. Self-coherent receivers consist of multiple optical delay interferometers (DI) with high-speed photodiodes attached to the outputs. By DSP of the photo currents it becomes possible to receive coherently modulated optical signals. Especially promising for 100 Gbit/s networks is the PolMUX DQPSK format, the self-coherent reception of which is described in detail.
Advanced Optical Communication Systems And Networks
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Author : Milorad Cvijetic
language : en
Publisher: Artech House
Release Date : 2013
Advanced Optical Communication Systems And Networks written by Milorad Cvijetic and has been published by Artech House this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Technology & Engineering categories.
This resource provides the latest details on 5th generation photonic systems that can be readily applied to projects in the field. Moreover, the book provides valuable, time-saving tools for network simulation and modeling. It includes coverage of optical signal transmission systems and networks; a wide range of critical methods and techniques, such as MIMO (multiple-input and multiple-output) by employing spatial modes in few-mode and multicore optical fiber; OFDM (orthogonal frequency-division multiplexing) utilized to enhance the spectral efficiency and to enable elastic optical networking schemes; and advanced modulation and coding schemes to approach the Shannon's channel capacity limit. There are detailed discussions on the basic principles and applications of high-speed digital signal processing, as well as description of the most relevant post-detection compensation techniques
Digital Signal Processing For High Speed Optical Communication
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Author : Jianjun Yu
language : en
Publisher:
Release Date : 2018
Digital Signal Processing For High Speed Optical Communication written by Jianjun Yu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with Optical fiber communication categories.
Optical Communications And Networking
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Author : Zhongqi Pan
language : en
Publisher: MDPI
Release Date : 2020-03-10
Optical Communications And Networking written by Zhongqi Pan and has been published by MDPI this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-03-10 with Technology & Engineering categories.
In the past few decades, the optical communication industry has explored multiple degrees of freedom of the photon, such as time, wavelength, amplitude, phase, polarization, and space, to significantly reduce the cost/bit of data transmission by increasing the capacity per fiber through multiplexing technology and by reducing the size and power through electronic and photonic integration. This book aims to explore the latest advancements in this industry, including the technologies in devices, systems, and network levels with applications from short-reach chip-to-chip interconnections to long-haul backbone communications at the trans-oceanic distance.
Optical Modulation
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Author : Le Nguyen Binh
language : en
Publisher: CRC Press
Release Date : 2017-11-22
Optical Modulation written by Le Nguyen Binh and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-11-22 with Computers categories.
This books aims to present fundamental aspects of optical communication techniques and advanced modulation techniques and extensive applications of optical communications systems and networks employing single-mode optical fibers as the transmission system. New digital techqniues such as chromatic dispersion, polarization mode dispersion, nonlinear phase distortion effects, etc. will be discussed. Practical models for practice and understanding the behavior and dynamics of the devices and systems will be included.