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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Novel optical CDMA platform for avionics applications

Ivan Glesk, Paul R. Prucnal

Published May 4, 2007• 0 citations
Publisher

Abstract

We designed, built, and demonstrated a highly scalable incoherent Optical CDMA testbed under DARPA contract as a novel platform for testing different avionics applications which will be characterized by Lockheed Martin. It enables users to communicate with each other at the OC-24 rate of ~1.25 Gbit/sec per user with raw BER of less than 10-12. The system architecture uses (3,11) fast wavelength-hopping, time-spreading prime codes with a chip size of 73 ps utilizing standard on-off-keyed picosecond optical pulses allocated in the time and wavelength domains. A novel design of optical encoders and decoders enables the realization of a secure connectivity approaching a so called "one-time-pad" security. The testbed is also designed to conduct eavesdropping studies among testbed users.

DOI
10.1117/12.723501

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Religación•Jul 19, 2019•0 citations
We designed, built, and demonstrated a highly scalable incoherent Optical CDMA testbed under DARPA contract as a novel platform for testing different avionics applications which will be characterized by Lockheed Martin. It enables users to communicate with each other at the OC-24 rate of ~1.25 Gbit/sec per user with raw BER of less than 10-12. The system architecture uses (3,11) fast wavelength-hopping, time-spreading prime codes with a chip size of 73 ps utilizing standard on-off-keyed picosecond optical pulses allocated in the time and wavelength domains. A novel design of optical encoders and decoders enables the realization of a secure connectivity approaching a so called "one-time-pad" security. The testbed is also designed to conduct eavesdropping studies among testbed users.
We designed, built, and demonstrated a novel optical CDMA-based platform running at OC-24 data rate, with three users and one eavesdropper. Error-free operation with BER better than 10-12was achieved. Based on our simulations, the testbed can support ten simultaneous users with BER-9. Novel "dual-code" OCDMA transmitter and receiver were designed and demonstrated to deliver more secure data transmission approaching One-time Pad security by implementing optical layer XOR and having the capability to perform bit-to-bit code swapping. The testbed was developed under DARPA contract and delivered to Lockheed Martin for further performance evaluations in different avionic applications.
Enhanced security has often been cited as an important benefit of optical CDMA (O-CDMA) signaling. However, the quality and degree of security enhancement has not been closely examined in the literature. This paper examines the degree and types of security that may be provided by O-CDMA encoding. A quantitative analysis of data confidentiality is presented for O-CDMA encoding techniques that use both time spreading and wavelength hopping. The probability of successful data interception is calculated as a function of several parameters, including signal-to-noise ratio and fraction of total available system capacity. For reasonable choices of system and encoding parameters, it is shown that increasing code complexity can increase the signal-to-noise ratio (SNR) required for an eavesdropper to "break" the encoding by only a few dB, while the processing of fewer than 100 bits by an eavesdropper can reduce the SNR required to break the encoding by up to 12 dB. The overall degree of confidentiality obtainable through O-CDMA encoding is also compared with that obtainable through standard cryptography. time-spreading/wavelength-hopping in particular, and O-CDMA in general, are found to provide considerably less data confidentiality than cryptography, and the confidentiality provided is found to be highly dependent on system design and implementation parameters.
OCDMA) is an alternative method, which performs encoding and decoding through an optical signature code, in order to allow the selection of a desired signal so that different users can share the same bandwidth.In such a systems, data signal overlap both in time and wavelength.Tradeoffs between security and performance in optical CDMA are presented.Confidentiality against eavesdropper interception strategies for optical CDMA is considered.Coherent detection and combining signals shows better confidentiality than the incoherent one.Spectral amplitude optical CDMA based on Modified Double Weight (MDW) systems, with different code dimension, is investigated.Increasing the network system capacity or maximizing authorized specified SNRs will lead to eavesdropper to detect high SNRs.
(OCDMA) is an alternative method, which performs encoding and decoding through an optical signature code, in order to allow the selection of the desired signal so that different users can share the same bandwidth. In such a system, the data signal overlap both in time and wavelength. Tradeoffs between security and performance in optical CDMA are presented. Confidentiality against eavesdropper interception strategies for optical CDMA is considered. Coherent detection and combining signals shows better confidentiality than the incoherent one. Spectral amplitude optical CDMA based on Modified Double Weight (MDW) systems, with different code dimension, is investigated. Increasing the network system capacity or maximizing authorized specified SNRs will lead to eavesdropper to detect high SNRs.