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.

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

23/11/2012

RESUMO

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, and consists of slicing spectrally optical signal and to apply various attenuations and delays to each of the slices spectral considered. These slices are multiplexed and the resulting signal, which will be propagated by an optical network transparent, it will be ideally unintelligible to eavesdropper who try to steals it. At this point is possible to evaluate the quality of the encryption used by measuring the output of the encoder the bit error rate, BER, the encrypted signal, BERC. In principle, as highest BERC,it will be lowest the probability of an eavesdropper decode the signal. To get to your destination, the signal is received in the decoder circuit, which has the same physical structure of the circuit which encoded the original signal. The application of the factors of attenuation and delay in this distorted signal is adjusted for the reconstruction of optical signal generated by the transmitter. On the output of decoder, performs the measurement of BER of signal decoded, the BERD. Ideally, BERD must be the lowest possible. For technique evaluation, it was simulated, with the version 8.7 of the software VPITransmissionMaker, of company VPIPhotonics Inc, the operation of the devices of cryptography, propagation and the elements of decoded signal. All simulations considered that the spectral slicing was carried out by means of filters with ideal profile. The results indicates that the BERC may reach up to 42% and 24%, to encrypted signals with modulation on-off Keying non return to zero (NRZ-OOK) and differential quadrature phase shift keying (DQPSK) respectively, and that both are free of errors (BERD<10-15 for the signal NRZ-OOK and BERD<10-6 for DQPSK modulation) when decoded.

ASSUNTO(S)

redes Ãpticas transparentes criptografia Ãptica telecomunicacoes optical cryptography transparent optical networks spectral slicing fatiamento espectral

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