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An all-optical method to enhance confidentiality in optical networks is presented. Security of a P2P OCDMA transmission is analyzed, where data are scrambled by a cascade of encoders, so that the decryption difficulty is increased.
In this paper, two different configurations to enhance the system confidentiality in a multi-user environment are presented. All-optical scrambling, based on optical code division multiple access (OCDMA) encoders, is used to prevent signal decryption from unauthorized users. Eye diagrams and BER measurements are also presented to describe the systems performance.
In this paper, it is shown that the use of real trigonometric transforms can advantageously replace the Fourier transform in optical communication systems, for both all-optical and electronic signal processing. All-optical discrete Hartley transform (DHT) and discrete Cosine transform (DCT) architectures for high-speed optical signal processing, filtering and data compression are compared to fiber...
The physical layer security of passive optical networks (PON) is investigated within a rigorous cryptoanalysis framework; we consider different threats and confidentiality attacks and propose different secure optical code division multiple access (OCDMA)-based architectures.
A novel optical layer solution to increase confidentiality in optical code division multiple access (OCDMA) transmission is proposed. We use two or more optical encoders/decoders to increase the degrees of freedom in the encoding process, increasing accordingly the decryption complexity. We demonstrate that we can achieve enhanced confidentiality, with respect to standard OCDMA system, evaluating...
We present different optical secure point-to-point transmission schemes using a planar multiport encoder/decoder. We consider both bit- and block-cipher cryptography: in the first case, each bit (both mark and space) from each user is encoded in a two-key optical code-division multiplexing signal. Block-cipher cryptography encodes a stream of n bits into a single code and corresponds to optical M-ary...
The impact of advanced modulation formats on the performance of an optical code division multiple access (OCDMA) transmission has been carefully investigated, as a function of bit error rate (BER) and spectral efficiency. Different modulation formats, as differential phase shift keying (DPSK), differential quaternary phase shift keying (DQPSK) and duobinary have been analyzed, and both coherent and...
Free Space Optics (FSO) is a technology able to provide line of sight wireless high-bandwidth digital communication links between remote sites. Therefore it is a key solution for addressing the last hundred meters of broadband requirements. For enhancing the capacity of optical wireless links, DWDM transmission can be used. In this work, 10 Gb/s and 40 Gb/s bit rates have been used in a DWDM fully...
The use of transparent free-space optics (FSO) allows the adoption of DWDM transmission enhancing the capacity of optical wireless link exploiting the full capacity of optical fibers. 40 Gbps data rates were obtained by time-multiplexing four 10 Gbit/s electrical sequences with a pattern length of 2. On field test on a real 60 m long transparent FSO link was performed so two devices to allow the necessary...
We report experiments on a fully transparent free space optic system operating at 2.5,10 and 40 Gbps. A on-field system operating on a 100 m link as been implemented and tested. Results demonstrate that this kind of system is able to exploit the high bandwidth provided by the fibers and that it can support WDM transmission; in particular it could be a competitive technology in the last mile/last hundred...
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