Spectral Slicing
Mostrando 1-4 de 4 artigos, teses e dissertações.
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1. All-optical cryptography through spectral amplitude and delay encoding
All-optical data encryption is a promising technology that could lead communication systems to an unprecedented degree of security. In this paper we use computer simulations to systematically investigate a new all-optical cryptography technique that is bit-rate independent and transparent to modulation formats. Encryption encompasses signal spectral slicing
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-12
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2. Optical cryptography through analog control of amplitude and delay of spectral slices: anlysis for NRZ and DQPSK signals. / Criptografia Ãptica mediante controle analÃgico da amplitude e do atraso de fatias espectrais: anÃlise para sinais NRZ e DQPSK.
This work investigates a technique to encrypt the optical signal for Transparent Optical Network, TON, in order to safeguard the confidentiality and guarantee the security of informations that are transmitted through the Telecommunications Network. The technique is assessed on the physical layer of the reference model for open systems interconnection, OSI, a
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/11/2012
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3. Flexible tunable spectrum sliced microwave photonic filter using parallel Fabry-Pérot filters and Fiber Bragg Grating
A simple and low-cost spectrum sliced microwave photonic filter with high tunability has been implemented. This is based on use of two Fabry-Pérot filters with same free spectral range connected in parallel but one filter with an external fiber delay. An extension of this configuration with Fiber Bragg Grating (FBG) as delay element is also demonstrated. Th
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2010-12
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4. Desenvolvimento e avaliação de uma metodologia para detecção de mudanças na cobertura vegetal do semi-árido. / Development and evaluation of a methodology for detection of changes in the vegetal cover of the semi-arid one.
In this work a methodology for the change detection in vegetation cover of semi-arid region was developed, using multi-temporal images of TMLandsat, in the red spectral band. In order to implement operationally this methodology two digital techniques were developed. These techniques do not need to make use of images with atmospheric correction for the genera
Publicado em: 2004