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Optical networks series

Signal Processing Techniques for Data Confidentiality in OCDMA Access Networks

Yue-Kai Huang, P. Toliver, Paul R. Prucnal

Published Jan 1, 2009• 1 citation
Publisher
DOI
10.1007/978-0-387-92131-0_12

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This chapter focuses primarily on summarizing results of research on optical code-division multiple access (OCDMA) confidentiality and security. It introduces the various classes of security for the readers who may not be familiar with the field of security and encryption. The chapter discusses how the degree of security in an OCDMA network can be quantified. OCDMA may be advantageous for increasing network availability in the presence of interfering signals, because the signal is spread over many wavelengths. The most commonly used architecture for OCDMA networks is the star network. In the star network, data from all users are collected at some central point and then distributed to all users. An eavesdropper in an OCDMA network may tap signals from various locations within the network. The network designer can design some countermeasures to make the eavesdropper's job a bit more difficult. OCDMA provides security at the physical layer of a communication network.

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Optical code-division multiple-access (OCDMA) is considered as a good technique to provide optical layer security. Many research works have been published to enhance optical network security by using optical signal processing. The paper, demonstrates the design of the AWG (arrayed waveguide grating) router-based optical network for spectral-amplitude-coding (SAC) OCDMA networks with Walsh Code to design a reconfigurable network codec by changing signature codes to against eavesdropping. In this paper we proposed a code reconfiguration scheme to improve the network access confidentiality changing the signature codes by cyclic rotations, for OCDMA system. Each of the OCDMA network users is assigned a unique signature code to transmit the information and at the receiving end each receiver correlates its own signature pattern a(n) with the receiving pattern s(n). The signal arriving at proper destination leads to s(n)=a(n).
This chapter focuses primarily on summarizing results of research on optical code-division multiple access (OCDMA) confidentiality and security. It introduces the various classes of security for the readers who may not be familiar with the field of security and encryption. The chapter discusses how the degree of security in an OCDMA network can be quantified. OCDMA may be advantageous for increasing network availability in the presence of interfering signals, because the signal is spread over many wavelengths. The most commonly used architecture for OCDMA networks is the star network. In the star network, data from all users are collected at some central point and then distributed to all users. An eavesdropper in an OCDMA network may tap signals from various locations within the network. The network designer can design some countermeasures to make the eavesdropper's job a bit more difficult. OCDMA provides security at the physical layer of a communication network.