Current Issue : January - March Volume : 2014 Issue Number : 1 Articles : 4 Articles
This paper presents an automatic optical equalizer based on a pair of in-house developed high efficiency, acousto-optic variable\r\noptical attenuators (AO-VOAs). The system is polarization insensitive and presents a wide bandwidth compatible with coarse\r\nwavelength division multiplexing (CWDM) requirements: 340 nm. The system operation is automatic and bidirectional and\r\nequalization is obtained in one single iteration of algorithm loop....
We report on the fabrication and characterization of activewaveguides in a TeO2-ZnO glass sample dopedwith Er3+/Yb3+ fabricated\nby direct laser writing with a femtosecond laser delivering 150 fs pulses at 1 kHz repetition rate. The waveguides exhibit an internal\ngain of 0.6 dB/cm at 1535 nm, thus demonstrating the feasibility of active photonics lightwave circuits and lossless components in\nsuch a glass composition....
We present an overview of methods and applications of automatic characterization of the appearance of materials through colour\r\nand texture analysis. We propose a taxonomy based on three classes of methods (spectral, spatial, and hybrid) and discuss their\r\ngeneral advantages and disadvantages. For each class we present a set of methods that are computationally cheap and easy to\r\nimplement and that was proved to be reliable in many applications. We put these methods in the context of typical industrial\r\nenvironments and provide examples of their application in the following tasks: surface grading, surface inspection, and contentbased\r\nimage retrieval. We emphasize the potential benefits that would come from a wide implementation of these methods, such\r\nas better product quality, new services, and higher customer satisfaction....
This work presents an alternative model of multimode fiber links with conventional silica weakly-guiding graded-index irregular\nmultimode fibers under a few-mode optical signal propagation generated by laser source. The proposed model is based on\nthe piecewise regular representation. It takes into account launch conditions, differential mode delay, both lower- and higherorder\nmode chromatic dispersion, differential mode attenuation, and mode mixing and power diffusion occurring due to real\nfiber irregularity and micro- and macrobends. We present some results of introduced model approbation with following pulse\npropagation simulations. A close matching with measured pulse responses at the output of test fibers is noticed....
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