1,721,127 research outputs found
TriPleX waveguide platform: low-loss technology over a wide wavelength range
Full text linkIn this article a selection of highlights of the TriPleX™ technology of LioniX is given. The basic waveguide technology is explained with recent benchmark measurements done by University California Santa Barbara (UCSB) and University Twente (UT-TE). In order to show the low loss transparency over a wide wavelength range three examples of applications in different wavelength regimes are described in more detail. These are the Integrated Laser Beam Combiner (ILBC) of XiO Photonics in the visible light, a ringresonator sensing platform of LioniX around 850 nm and a phased array antenna with an Optical Beam Forming Network in the 1550 nm band. Furthermore it is shown that the technology is easily accessible via Multi Project Wafer Runs for which the infrastructure and design libraries are also set up
Compact integrated cross connects for wavelength-division multiplexing networks
No full textApplied Science
Integrated optics for microwave phased-array antennas
No full textElectrical Engineering, Mathematics and Computer Scienc
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
Monolithic integrated reflective transceiver in indium phosphide
Full text linkThe work presented in this thesis is about an InP based monolithic integrated reflective transceiver meant for use in future fiber access networks at the user site. The motivation for this research results from the users’ demands for ever-increasing bandwidth at low cost of operation, administration and maintenance. We investigated solutions to these challenges with a network concept using a dynamically reconfigurable optical network topology with a wavelength router and a colorless optical network unit. This work focuses on developing the optical part of the optical network unit, a reflective transceiver. This reflective transceiver consists of three basic components: a tunable wavelength duplexer, a photodetector and a reflective modulator. The tunable wavelength duplexer separates two wavelengths, one for the downstream and one for the upstream signals, and guides them to the photodetector and the reflective modulator. The photodetector detects the downstream data. The reflective modulator modulates the light carrier with the upstream data and reflects it back to the network. The integrated transceiver was realized bymonolithically integrating these components on a common active-passive butt-joint layer stack based on InP technology. This approach not only offers high bandwidth for both downstream data and upstream data, but also lowers the cost of the device and the network operation because of the colorless operation at the user site. The main results obtained within this work are summarized as follows: an efficient and polarization insensitive tunable wavelength duplexer was realized; a new method to fabricate a reflective SOA has been proposed and demonstrated; a high performance waveguide photodetector based on SOA layer stack was successfully fabricated; a low cost photoreceiverwhich includes an InP photodetector and a SiGe amplifier was demonstrated; aworking monolithic integrated reflective transceiver based on InP was successfully realized and demonstrated; two monolithic integrated transceivers aiming for higher bandwidth have been designed and fabricated. In addition, a novel MMI reflector has been proposed and realized with high reflectivity. This work was funded by DutchMinistry of Economic Affairs through the Freeband Project Broadband Photonics Access, the Smartmix projectMemphis and the NRC Photonics
Integration of semiconductor optical amplifiers in wavelength division multiplexing photonic integrated circuits
No full textElectrical Engineering, Mathematics and Computer Scienc
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