6,453 research outputs found
Dataset: Angle-spliced SMF to hollow core fiber connection with optimized back-reflection and insertion loss
No full textThis dataset supports the manuscript submitted to Journal of Lightwave Technology:
Cong Zhang, E. N. Fokoua, S. Fu, M. Ding, F. Poletti, D. J. Richardson, and R. Slavík
Angle-spliced SMF to hollow core fiber connection with optimized back-reflection and insertion loss. The dataset consists of an uploaded Archive (RAR) folder which includes 5 data files in Excel format.</span
Xue ni hong zhao /
No full textIn 4 parts, designated qian hou run and mo bian. Pt. 4 by Shao Songnian and Shao Chunnian.Caption title; title on slip mounted on cover: Gao shou Guang lu da fu tou pin ding dai li bu zuo shi lang Biansheng fu jun zi ding nian pu.Mode of access: Internet
Crossing-free on-chip 2×2 polarization-diverse switch
No full textWe propose and demonstrate an on-chip 2× 2 polarization-diverse switch for simultaneously handling two-group polarization multiplexed signals with waveguide crossing-free design. Each input polarization tributary can be independently switched and less than 1 dB power penalties are experimentally observed.</p
Angle-spliced SMF to hollow core fiber connection with optimized back-reflection and insertion loss
No full textWe study and demonstrate angle-cleaved fusion splicing between single mode fiber (SMF) and nested anti-resonant node-less fiber (NANF). First, we analyze the trade-off between the connection loss and back-reflection suppression. Subsequently, we angle-cleave and splice connections with selected parameters, demonstrating a connection loss of 1.25 dB (0.6 dB higher than for a flat-cleaved connection) and back-reflection below -40 dB (as compared to -15 dB for the flat-cleaved connection). The measured spliced connection loss is only slightly higher (0.2-0.3 dB) than that predicted due to the angle cleave and the mode field mismatch. This was achieved mainly thanks to accurate angle-cleaving and an improved offset splicing technique that we have developed. We characterized the prepared SMF-NANF spliced connections with a range of techniques, evaluating the connection loss, unwanted coupling to the LP11 mode, and back-reflection. Finally, we show how the reduced back-reflection can improve the performance of a communication system through reduction of round-trip induced multipath interference
Low loss and back-reflection interconnection between SMF and hollow core fiber by angled fusion splicing
No full textA 2.2° angle cleave reduces the back-reflection by 25 dB (to below -40 dB) while increasing the insertion loss by only 0.6 dB (to 1.3 dB) when compared to a flat-cleaved splice
Fu Describing About the Author Himself: A Focus on Ban Gu "You tong fu"
No full textFrom Later Han dynasty onwards, the number of fu describing about the author himself has increased. There are several possible reasons for this, but the most important reason is probably that there was no other genre through which one could express oneself except for fu in this period. For instance, the fiveword poetry was still in the middle way of establishing its own style at that moment. Moreover, in Former Han, there were few opportunities for authors to talk about themselves in detail in fu, because the main readers were emperors and kings of countries. In Later Han, the readers had become more diverse. That is probably the reason why more fu began to mention about the authors themselves in this period. Ban Gu (32-92), who is a representative scholar of Later Han and also a man of letters, expressed his aim by writing "You tong fu". Its main content is that though one's encounter with a disaster or felicity is not always derived from our behavior, we have to have a strong will and take action to overcome disasters. This idea is supported by Ban Gu's experiences of not attaining his aim. Such experiences are common in Chinese authors. One of the earliest examples is Chu Ci. Also, Chu Ci is the one of the origins of fu. It is surprising that authors expressed things about themselves mostly in fu describing journeys. It may be easier to understand this tendency if we think they substituted the heaven wander in Chu Ci with a ground journey. Chu Ci was a model for authors to express their aim which could not come true, even if the journey on the ground and the wander in heaven are different
Dataset for the article "Splicing hollow core fiber with standard glass-core fiber with ultralow back-reflection and low coupling loss"
No full textPaper to be published in ACS Photonics
Uploaded Archive (RAR) includes 5 data files that are Excel format (.xlsx)
The figures are as follows:
Fig. 1: The back-reflection and coupling loss of spliced SMF-HCF connection.
Fig. 4. The relationship between coupling loss and offset of light propagated through GRINs with different cleave angles to a NANF.
Fig. 7. Simulated and measured back-reflection from angle-cleaved GRINs with SMF-GRIN offset. Simulations: offset (given next to the data points) optimized for minimum coupling loss. Exper-iment: offset of 4 µm (blue stars) and 5 µm (green triangles).
Fig. 8. Back-reflection from zero-offset angle-cleaved SMF-GRIN: simulations (red line), data from literature (blue [22] and green [24] squares), and achieved experimentally here (red circles).
Fig. 11. Measured OTDR trace showing back-reflection in the offset-spliced SMF-GRIN angle-spliced to the HCF</span
Splicing hollow core fiber with standard glass-core fiber with ultralow back-reflection and low coupling loss
No full textA main, yet-unsolved challenge in splicing hollow core fiber (HCF) into standard single mode fiber (SMF) system lies in managing the strong Fresnel back-reflection that occurs when the light travels from the empty core of the HCF into the glass core of the SMF or vice-versa. This impacts the performance of the system due to effects such as multipath inter-ference. Here, we demonstrate a new technique that combines angle-cleaving the HCF, which reduces the back-reflection with offset splicing the mode-field adapter to the SMF, which compensates for the refraction at the glass-air interface, enabling us to achieve low coupling loss. We first analyze this novel configuration via simulations and show that it is possible to achieve a coupling loss that is comparable to a conventional flat-cleaved splice. Subsequently, we fabricate an SMF-HCF connection with loss of 0.6 dB prior to arcing (1.2 dB after splicing) and ultralow back-reflection (-64 dB) by applying an optimized 4.5° angle and 5 µm offset. To the best of our knowledge, this is the first low insertion loss spliced SMF-HCF connection where a widely acceptable level of back-reflection of < -60 dB is achieved
Online Iterative Adaptive Dynamic Programming Approach for Solving the Zero-Sum Game for Nonlinear Continuous-Time Systems with Partially Unknown Dynamics
No full textThe current study presents an online iterative adaptive dynamic programming approach to resolve the zero-sum game (ZSG) for nonlinear continuous-time (CT) systems containing a partially unknown dynamic. The Hamilton-Jacobian-Issacs (HJI) equation is solved along the state trajectory according to the value function approximation and the policy improvement online. Relaxed dynamic programming is utilized to ensure the algorithm’s convergence. Model and costate networks were established to conduct the method. Computational simulations are performed to present the efficiency of the algorithm.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Control & Simulatio
Note of congratulations from Jack Huang to Dr. Frank Fu, January 1, 1983
No full textA note of congratulations to Dr. Frank H. Fu (Fu Haojian) from Springfield College Alum, Jack Huang, Class of 1936, dated January 1, 1983. The card has country lane scene on the front, with a tree with pink leaves, a buttfly, and a tree with its leaves still green. There is the roof of a house just visible over the hill. It also says Congratulations. Inside is short message.Mr. Huang wrote a short personal note congratulating him for his efforts and the recent recognition by then President Ronald Reagan, or the actor as he refers to him, and saying how proud the Chinese are of him. An author of 17 textbooks and more than 100 journal articles, Frank H. Fu, G’73, DPE’75, has worked across the world in China, Canada, and the United States. Throughout his career, he has received many distinguished honors, including the Medal of Honor in 2009 by the SAR Government of Hong Kong.
Fu has held positions at institutions such as the Chinese University of Hong Kong and Springfield College, where he served as director of the International Center starting in 1978. Five years later, Fu returned to Hong Kong, but has since remained actively involved with Springfield College, participating in talks on the campus and even hosting a gathering of nearly 60 alumni in Hong Kong.
Currently, Fu is the associate vice president of Hong Kong Baptist University, where he also works as the director of the Dr. Stephen Hui Research Centre of Physical Recreation and Wellness. In addition, Fu is president of the Society of Chinese Scholars on Exercise Physiology and Fitness, chairperson of Hong Kong Coach Education Committee, a research fellow of the Research Consortium of SHAPE America, and an international fellow of the National Academy of Kinesiology
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