1,720,963 research outputs found
Non-destructive characterization of hollow core fiber
No full textWe summarize our recent work developing a technique for accurate and non-destructive measurement of the microstructure geometry of nested and double nested antiresonant fibers. We present results showing microstructure variation along a 2.2 km fiber
Optimizing Single Coated Hollow-core Fibers for Microbending Loss Reduction
No full textWe use the theory of elasticity and finite element modelling to optimize single coating parameters for microbending loss reduction in hollow-core fibers. We find that stiffer coating materials can offer effective loss reduction
Coupling light into a hollow-core fiber with mitigated excitation of higher-order modes
No full textWe show experimentally that unwanted crosscoupling into higher-order modes of a hollow-core fiber can be reduced to values close to -40 dB when optimizing the input beam size for their suppression rather than optimizing it for the minimum insertion loss.</p
Simultaneous distribution of stable frequency and data signals over hollow-core optical fibers
No full textWe demonstrate the simultaneous distribution of stable frequency and data signals over hollow-core fibers (HCF). We show that the use of HCF reduces frequency stability degradation observed in links made of standard single-mode fibers (SMFs) due to nonlinear interaction between the co-propagating signals which is orders of magnitude weaker in HCF.</p
Hollow core fibre based Fabry-Perot resonators with Q factor over 90 billion
No full textQ factor over 90 billion is demonstrated for the first time in hollow core fibre based Fabry-Perot resonators. This is achieved thanks to low-loss of the latest hollow core fibers. Such high Q factor together with other beneficial properties of hollow core fibers such as low thermal sensitivity and high power handling is of interest for a range of applications including laser stabilization in metrology.</p
10.9km hollow core double nested antiresonant nodeless fiber (DNANF) with 0.33dB/km loss at 850nm
No full textWe report a double-nested antiresonant hollow core fiber designed for ~850nm operation. The measured fiber loss is 0.33dB/km at 850nm across a single span of 10.9km.</p
Bending and temperature dependence of polarization mode dispersion in nodeless antiresonant hollow core fibers
No full textWe identify empirical thermal and bending attributes of PMD in short nodeless antiresonant fibers (ARFs). Surprisingly, bend-scaling properties are comparable to solid fibers, albeit with greater magnitude, while temperature dependence is more varied.</p
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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