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In the last few years, several authors have reported the observation of a new class of acoustic waves in sub-wavelength diameter tapered optical fibers (TOFs) through Brillouin scattering [1, 2]. These include the observation of surface acoustic waves (SAW), hybrid shear and longitudinal acoustic waves (HAW) associated with anti-crossings (AC). It has also been suggested that these acoustic waves...
One of the most essential building blocks in modem electronics is the flip-flop. A flip-flop operates bi-stably between two states, remaining at a given output level (high or low level) until a specific input control signal changes. For many years, photonics has attempted to build all-optical flip-flops [1-3]; however, the success of these approaches has usually been limited by the dependence of the...
Molecular spectroscopy can potentially achieve very high frequency resolution, but transitions are generally very weak. The scientific community has tried to tackle this problem by increasing the interaction path length using extremely long cells, sophisticated multipass cells and Fabry-Perot cavities. As such, molecular spectroscopic methods do not lend themselves naturally to miniaturization. Compact...
Optical spectrum is one of the most important characteristics of a laser radiation. Many spectral techniques are proposed and developed for spectral measurement, which are based on diffraction gratings, heterodyne or stimulated Brillouin scattering (SBS) amplification. For the last one, the signal radiation is amplified via SBS when frequency difference between pump wave and signal under test corresponds...
Fiber-optic Brillouin sensors for temperature and strain distributed monitoring offer unique performance in terms of distance, high spatial resolution and accuracy. Most of the available systems rely on Brillouin Optical Time-Domain Analysis (BOTDA) techniques, which employ pulsed pump signals guaranteeing a spatial resolution fundamentally limited to 1 meter [1]. An attractive alternative approach...
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