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3 results on '"C. Cuadrado-Laborde"'

1. Experimental demonstration of fractional order differentiation using a long-period grating-based in-fiber modal interferometer

Author

A. Carrascosa, L. Poveda-Wong, Miguel V. Andrés, Jose L. Cruz, and C. Cuadrado-Laborde

Subjects
Optical fiber, Ciencias Físicas, Phase (waves), Physics::Optics, 02 engineering and technology, Grating, Mach–Zehnder interferometer, 01 natural sciences, FRACTIONAL DIFFERENTIATION, law.invention, 010309 optics, 020210 optoelectronics & photonics, Optics, law, Fiber laser, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Chirp, Electrical and Electronic Engineering, Physical and Theoretical Chemistry, FIBER OPTICS, Physics, business.industry, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Pulse (physics), Astronomía, Wavelength, LONG-PERIOD GRATING, business, MACH–ZEHNDER, CIENCIAS NATURALES Y EXACTAS
Abstract

In this work we demonstrate both, experimentally and theoretically, that a long-period grating-based in-fiber modal interferometer can perform an all-optical arbitrary-order fractional differentiation. Experimentally, we fractionally differentiated to the 0.5th order a secant hyperbolic-like pulse of 23 ps time width provided by a 1039.5 nm emission wavelength modelocked fiber laser, with a chirp parameter of −30. An analytical expression relating the fractional order of differentiation n with the characteristics of the modal interferometer was also derived, with the purpose to simplify the design procedure. The proposal was corroborated also numerically. This device may find applications in real time phase recovery. Fil: Poveda Wong, L.. Universidad de Valencia; España Fil: Carrascosa, A.. Universidad de Valencia; España Fil: Cuadrado Laborde, Christian Ariel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; Argentina Fil: Cruz, J.L.. Universidad de Valencia; España. Universidad Catolica Argentina; Argentina Fil: Andrés, M.V.. Universidad de Valencia; España

Published
2016
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2. Instantaneous frequency measurement by in-fiber 0.5th order fractional differentiation

Author

Antonio Diez, C. Cuadrado-Laborde, Jose L. Cruz, Miguel V. Andrés, L. Poveda-Wong, and A. Carrascosa

Subjects
Optical fiber, Ciencias Físicas, 02 engineering and technology, 01 natural sciences, Signal, Instantaneous phase, law.invention, 010309 optics, FRACTIONAL CALCULUS, 020210 optoelectronics & photonics, Optics, law, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, PHASE RECOVERY, Electrical and Electronic Engineering, Physical and Theoretical Chemistry, FIBER OPTICS, Physics, business.industry, Fiber (mathematics), CHIRP MEASUREMENT, Laser, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Fractional calculus, Pulse (physics), Intensity (physics), Astronomía, LONG-PERIOD FIBER GRATINGS, business, CIENCIAS NATURALES Y EXACTAS
Abstract

We experimentally demonstrate the possibility to retrieve the instantaneous frequency profile of a given temporal light pulse by in-fiber fractional order differentiation of 0.5th-order. The signal's temporal instantaneous frequency profile is obtained by simple dividing two temporal intensity profiles, namely the intensities of the input and output pulses of a spectrally-shifted fractional order differentiation. The results are supported by the experimental measurement of the instantaneous frequency profile of a mode-locked laser. Fil: Poveda-Wong, L.. Universidad de Valencia; España Fil: Carrascosa, A.. Universidad de Valencia; España Fil: Cuadrado Laborde, Christian Ariel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; Argentina. Universidad Catolica Argentina; Argentina Fil: Cruz, J. L.. Universidad de Valencia; España Fil: Díez, A.. Universidad de Valencia; España Fil: Andrés, M. V.. Universidad de Valencia; España

Published
2016
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3. Joint transform correlator optical encryption system: Extensions of the recorded encrypted signal and its inverse Fourier transform

Author

Gustavo E. Galizzi and C. Cuadrado-Laborde

Subjects
JOINT TRANSFORM CORRELATOR, Computer science, INGENIERÍAS Y TECNOLOGÍAS, Encryption, symbols.namesake, Optics, Electrical and Electronic Engineering, Physical and Theoretical Chemistry, S transform, Ingeniería Eléctrica, Ingeniería Electrónica e Ingeniería de la Información, SPACE BANDWIDTH PRODUCT, Ingeniería de Sistemas y Comunicaciones, business.industry, Bandwidth (signal processing), Short-time Fourier transform, Spectral density, Atomic and Molecular Physics, and Optics, Fractional Fourier transform, Electronic, Optical and Magnetic Materials, Optical encryption, OPTICAL INFORMATION PROCESSING, Fourier transform, OPTICAL ENCRYPTION, symbols, business, Telecommunications, Algorithm
Abstract

In this work we study the joint transform correlator setup, finding two analytical expressions for the extensions of the joint power spectrum and its inverse Fourier transform. We found that an optimum efficiency is reached, when the bandwidth of the key code is equal to the sum of the bandwidths of the image plus the random phase mask (RPM). The quality of the decryption is also affected by the ratio between the bandwidths of the RPM and the input image, being better as this ratio increases. In addition, the effect on the decrypted image when the detection area is lower than the encrypted signal extension was analyzed. We illustrate these results through several numerical examples. Fil: Galizzi, Gustavo Ernesto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; Argentina Fil: Cuadrado Laborde, Christian Ariel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; Argentina. Universidad Catolica Argentina; Argentina

Published
2015
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