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Demonstration of Record BER and Number of Users for Optical CDMA (O-CDMA), with Implications to Secure Communications

Antonio J. Mendez, V. J. Hernandez, C. V. Bennett, Robert M. Gagliardi, William J. Lennon

Published Feb 25, 2005• 2 citations
OpenAlex

Abstract

We demonstrate a BER of 10{sup -11} for 16 simultaneous users, using wavelength/time O-CDMA. We show the extent to which severe multi-access interference can be used to mask and/or degrade the signal from an intruder.

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Multi user interference in optical CDMA systems comes from the property that users' signature sequences are not completely orthogonal, which will severely affect the performance of OCDMA systems, thereby directly limiting the number of users which simultaneously use the system to transfer data. So it is very important to try our best to minimize the multi user interference. In this paper several solutions for reducing multi user interference are introduced, and their performance is discussed.
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.