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224 results on '"Soskind, Yakov G."'

1. Fast and broadband detector for laser radiation

Author

Soskind, Yakov G., Scorticati, Davide, Crapella, Giacomo, Pellegrino, Sergio, Soskind, Yakov G., Scorticati, Davide, Crapella, Giacomo, and Pellegrino, Sergio

Abstract

We developed a fast detector (patent pending) based on the Laser Induced Transverse Voltage (LITV) effect. The advantage of detectors using the LITV effect over pyroelectric sensors and photodiodes for laser radiation measurements is the combination of an overall fast response time, broadband spectral acceptance, high saturation threshold to direct laser irradiation and the possibility to measure pulsed as well as cw-laser sources. The detector is capable of measuring the energy of single laser pulses with repetition frequencies up to the MHz range, adding the possibility to also measure the output power of cw-lasers. Moreover, the thermal nature of the sensor enables the capability to work in a broadband spectrum, from UV to THz as well as the possibility of operating in a broad-range (10^(-3)-10^2 W/cm^2 ) of incident average optical power densities of the laser radiation, without the need of adopting optical filters nor other precautions.

Published
2018

2. Interferometric characterization of few-mode fibers (FMF) for mode-division multiplexing (MDM)

Author

Soskind, Yakov G., Olson , Craig, Muliar, Olena, Usuga Castaneda, Mario A., Rottwitt, Karsten, Lægsgaard, Jesper, Soskind, Yakov G., Olson , Craig, Muliar, Olena, Usuga Castaneda, Mario A., Rottwitt, Karsten, and Lægsgaard, Jesper

Abstract

The rapid growth of global data traffic demands the continuous search for new technologies and systems that could increase transmission capacity in optical links and recent experiments show that to do so, it is advantageous to explore new degrees of freedom such as polarization, wavelength or optical modes. Mode division multiplexing (MDM) appears in this context as a promising and viable solution for such capacity increase, since it utilizes multiple spatial modes of an optical fiber as individual communication channels for data transmission. In order to evaluate its performance, a MDM system requires advanced characterization methods with regard to the modal content of its photonics components and in particular of the fibers involved for data transmission. In this contribution we present a time-domain interferometric technique for a full modal characterization of few mode fibers (FMF), commonly used in a MDM scenario. This experimental technique requires the use of a Mach-Zehnder interferometer, where the reference's path length is controlled by an optical delay line. The interference between the output beams of reference and fiber under test (FUT) is recorded on a CCD camera and a careful evaluation of the resulting interferograms allows us to have full access to key parameters such as number of modes, modal weight, differential time delay between propagating modes and intensity profiles. In this work, we apply this simple and complete characterization method to the case of a short link with two optical modes propagating in a FMF, which illustrates its potential as a diagnostic tool for MDM systems.

Published
2015

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