1,721,144 research outputs found
Trench width dependant deeply etched surface-defined InP gratings for low-cost high speed DFB/DBR
Full text linkIn this paper we are reporting a fabrication process for multi-section telecom lasers based on surface defined lateral gratings, which is compatible with low-cost high-throughput nano-imprint lithography. A new grating definition process is developed, which allow a better control of the cross section geometry to obtain higher coupling strength
Experimental and Theoretical Investigations on Spectral Gain Bandwidth of Broadband (>300 nm) InP-based Quantum Dash Material
No full text22 GHz Direct-Modulated Weakly Coupled DBR Laser Fabricated by Focused Ion Beam Lithography
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Optical gain properties of InAs/InAlGaAs/InP quantum dash structures with a spectral gain bandwidth of more than 300 nm
No full textThe excellent wavelength tuning properties of InP-based quantum dash (QDash) layer structures were used to realize ultrawide-gain bandwidth lasers for applications in the 1.55 mu m telecommunication range. To expand the attainable gain bandwidth six QDash layers with three different emission wavelengths were combined in a laser structure. Broad area laser evaluation reveals good device performance. Within the optical telecommunication band at 1.55 mu m a gain bandwidth of more than 300 nm could be experimentally confirmed, which is in good quantitative agreement with theoretical predictions by taking into account an inhomogeneous carrier distribution between the different dash layer
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
Wavelength conversion at 10 GHz using a two-color photonic crystal gate
No full textAn Indium Phosphide two-color optical gate based on a photonic crystal molecule was used to achieve wavelength conversion at a rate up to 10 GHz
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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