1,721,022 research outputs found
Distortion-corrected phase demodulation using phase-generated carrier with multitone mixing
Get PDFWe present a novel phase generated carrier (PGC) demodulation technique for homodyne interferometers which is robust to modulation depth variations and source intensity fluctuations. By digitally mixing the waveform with a multitone synthetic function (a linear combination of harmonics of the modulating signal), distortion can become negligible even in presence of large variations of the modulation depth. The technique only requires two mixers and can also provide the DC component of the phase in real time, without needing any previously recorded data or ellipse-fitting algorithms. We validate the technique with simulated waveforms and with experimental data from a wavelength metering experiment using an integrated unbalanced interferometer on-chip, showing that the technique corrects distortion without increasing the noise with respect to the standard PGC technique
Towards robust grasping: An analysis of in-hand object motion with FBG optical fibers as force sensing technology
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Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
8×25 Gbps Transmitter based on Monolithically InP Integrated Directly Modulated Tunable DFB Lasers
No full textA fully packaged monolithically InP Integrated array of directly modulated DFB lasers individually tunable is presented. BER measurements have validated this simple array architecture for short range transmission up to 8Ã25 Gbps
Variations on the Author
Get PDF“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
Get PDFWe 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
Design and Characterization of 10 Gb/s and 1 Grad TID-Tolerant Optical Modulator Driver
No full textThis paper presents the design and the experimental characterization of a 10 Gb/s electronic driver for silicon Mach-Zehnder modulators (MZMs). This driver is able to operate in harsh environments characterized by radiation levels up to 1 Grad(SiO2) total ionizing dose (TID). To compensate for the detrimental effects that radiation produces on the target 65 nm bulk silicon technology both device- and circuit-level radiation hardened by design (RHBD) techniques are developed and implemented. Extreme TID levels are faced using long-channel transistors with enclosed layout, avoiding the use of p-MOSFETs, and implementing a differential self-biased cascode architecture with common-mode feedback. Band-widening techniques, e.g., inductive peaking, cross-coupled capacitors, and buffer chaining, have been used to improve the driver's frequency response and reach the targeted data rate. Electrical measurements show 10 Gb/s waveforms with an eye diagram amplitude suitable for MZM driving. Electro-optical measurements performed connecting the electronic driver to a silicon photonic MZM confirm the achievement of a 10 Gb/s system-level operability. The radiation hardness of the driver is verified by exposing the integrated circuit to X-rays. The measurements confirm the ability of the driver to work up to 1 Grad with an eye amplitude reduction of only 10% and a 7% increment in the rise and fall times, validating the effectiveness of the implemented RHBD techniques
30 Gb/s NRZ Transmission with Lumped-Element Silicon Photonic Mach-Zehnder Modulator
No full textThis work presents the experimental characterization of a compact non-traveling-wave Mach-Zehnder modulator fabricated in a standard foundry process. Non-return-to-zero modulation was validated till 30 Gb/s by BER measurements and 13.2 GHz-6-dBe electro-optic bandwidth was measured under single-arm driving
Silicon photonic devices for optical data readout in high-energy physics detectors
No full textSilicon photonics is standing out as a potential technology for the development of radiation-tolerant optical transceivers. In this work, we report the preliminary electro-optical characterization of two radiation-hardened-by-design shallow-etched Mach–Zehnder modulators with different doping configurations
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