1,721,057 research outputs found
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
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
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
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
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
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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