6,502 research outputs found
Temperature Dependent Characteristics of L-band EDFA Using Phosphorus- and High-Aluminum Co-doped Silica Fibers
No full textThis dataset supports the publication:
Ziwei Zhai, Arindam Halder, Yu Wang, Martin Nunez Velazquez, Jayanta Sahu. (2022) Temperature Dependent Characteristics of L-band EDFA Using Phosphorus- and High Aluminum- Co-doped Silica Fibers, presented at Optical Fiber Communication Conference (OFC) 2022, 6–10 March 2022, San Diego, California, United States</span
Progress in Er-doped fibers for extended L-band operation of amplifiers
No full textErbium (Er)-doped fiber amplifiers (EDFAs) have revolutionized optical fiber communication, facilitating long-distance, large-capacity, and high-reliability data transmission. The explosive growth in transmission capacity, particularly in dense-wavelength-division-multiplexed (DWDM) communication systems, necessitates the development of efficient EDFAs beyond the C-band (1530-1565 nm) and traditional L-band (1565-1610 nm). However, the expansion of bandwidth is limited by signal-induced excited-state absorption (ESA) effects in EDFs, highlighting the importance of optimizing fiber core compositions with appropriate co-dopants and concentrations in designing extended L-band EDFs. High-performance EDFAs in the extended L-band require improvements in gain, bandwidth, noise figure, and efficiency. This paper reviews the spectroscopic properties of EDFs in alumino-silicate, phospho-silicate, and ternary AlPO4-SiO2 glass hosts, with a particular focus on ESA effects. We review the current state of the art of extended L-band EDFAs in single-stage amplification, emphasizing silica-based glass hosts with tailored material compositions of the fiber core. Various novel co-dopants are discussed, like ytterbium (Yb), cerium (Ce), and yttrium (Y). We also explore the optimization on the pump wavelengths and amplification schemes, including single-pass and double-pass configurations. In addition, this review addresses both the temperature and radiation effects of L-band EDFAs, demonstrating the potential of radiation-resistant EDFAs for advancing aerospace-based optical communications
1480 nm Diode-Pumped Er<sup>3+</sup>:Yb<sup>3+</sup> Co-Doped Phospho-Alumino-Silicate Fiber for Extending the L-band Gain Up to 1625 nm
No full textIn this article, we report erbium/ytterbium (Er/Yb) co-doped phospho-alumino-silicate fibers (EYDFs) fabricated by the modified chemical vapor deposition (MCVD) and solution doping technique, to extend the L-band gain up to 1625 nm. Fibers with different doping concentrations and Yb-to-Er ratios were studied in terms of the spectroscopic properties and optical amplification in the L-band when pumped at 1480 nm. A higher Yb-to-Er ratio suppressed the signal-induced excited-state absorption (ESA) effect and also improved the amplifier gain in the L-band. A maximum gain of 15.5 dB at 1625 nm was achieved for the fiber with an Yb-to-Er ratio of 3.5. The gain coefficient was 0.039 dB/mW and the saturation output power was 21.5 dBm at 1600 nm. On the other hand, one highly doped fiber with the Er2O3 concentration of 0.5 mol% and an Yb-to-Er ratio of 2 was demonstrated to have the controlled Er concentration quenching and a reduced amplifier device length, exhibiting 12.9 dB gain and 6.3 dB noise figure (NF) at 1625 nm, with <5.8 dB NF from 1575 to 1623 nm. What's more, the temperature-dependent amplifier performance was studied, over the temperature range of -60 to 80 °C. The temperature-dependent-gain (TDG) coefficient and its zero-point wavelength were reported. An increased L-band gain was achieved by cooling the fiber.</p
Data in support of the journal article 'Progress in Er-doped Fibers for Extended L-band Operation of Amplifiers'
No full textThis data is supporting an invited journal article 'Progress in Er-doped Fibers for Extended L-band Operation of Amplifiers' published on Optics Communications.
The data access is under CC BY license. </span
Kui lei jia ting
No full text易卜生著 ; 翟一我譯.Cover title.Translation of: Et dukkehjem.Plays.Chinese and English.Yibosheng zhu ; Zhai Yiwo yi
Dataset in support of the journal article '1480 nm Diode-Pumped Er3+:Yb3+ Co-Doped Phospho-Alumino-Silicate Fiber for Extending the L-Band Gain Up to 1625 nm'
No full textThis dataset supports the journal article '1480 nm Diode-Pumped Er3+:Yb3+ Co-Doped Phospho-Alumino-Silicate Fiber for Extending the L-Band Gain Up to 1625 nm' Published in the Journal of Lightwave Technology
The excel file contains all experimental data used for generating Fig.1, Fig.2, Fig.3, Fig.5, Fig.6, Fig.7, Fig.8, and Fig.9.</span
Xi jun ji qun yun dong zhong shui dong xiang hu zuo yong de yan jiu
No full textZhai, He = 细菌集群运动中水动相互作用的研究 / 翟翯.Thesis M.Phil. Chinese University of Hong Kong 2015.Includes bibliographical references (leaves 54-59).Abstracts also in Chinese.Title from PDF title page (viewed on 08, November, 2016).Zhai, He = Xi jun ji qun yun dong zhong shui dong xiang hu zuo yong de yan jiu / Zhai He
CPC: automatically classifying and propagating natural language comments via program analysis
No full textCode comments provide abundant information that have been lever-aged to help perform various software engineering tasks, such as bug detection, specification inference, and code synthesis. However,developers are less motivated to write and update comments, making it infeasible and error-prone to leverage comments to facilitate software engineering tasks. In this paper, we propose to leverage program analysis to systematically derive, refine, and propagate comments. For example, by propagation via program analysis, comments can be passed on to code entities that are not commented such that code bugs can be detected leveraging the propagated comments. Developers usually comment on different aspects of code elements like methods, and use comments to describe various contents, such as functionalities and properties. To more effectively utilize comments, a fine-grained and elaborated taxonomy of comments and a reliable classifier to automatically categorize a comment are needed. In this paper, we build a comprehensive taxonomy and propose using program analysis to propagate comments. We develop a prototype CPC, and evaluate it on 5 projects.The evaluation results demonstrate 41573 new comments can be derived by propagation from other code locations with 88% accuracy. Among them, we can derive precise functional comments for 87 native methods that have neither existing comments nor source code. Leveraging the propagated comments, we detect 37 new bugs in open source large projects, 30 of which have been confirmed and fixed by developers, and 304 defects in existing comments (by looking at inconsistencies between existing and propagated comments),including 12 incomplete comments and 292 wrong comments. This demonstrates the effectiveness of our approach. Our user study confirms propagated comments align well with existing comments in terms of quality.Peer reviewe
Fan ti zi he jian ti zi du zhe zai yue du zhong de cha yi
No full textZhai, Mingjun.Thesis M.Phil. Chinese University of Hong Kong 2014.Includes bibliographical references (leaves 64-68).Abstracts also in Chinese.Title from PDF title page (viewed on 30, September, 2016).Zhai, Mingjun
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