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International Conference on Microwave and Millimeter Wave Technology (ICMMT)

Design and simulation of a novel phase-encoded OCDMA system

Wu Pan, Jing Qiao, Yang Jing

Published Apr 1, 2008• 1 citation
Publisher

Abstract

The security of optical code division multi-access (OCDMA) system was analyzed, and the results indicate the hidden trouble of security. A scheme of multi-codes to be transmitted single-user information has been proposed, and single-user eavesdropping model has been simulated. The soft platform of system simulation was built by optisystem3.0 and MATLAB. The simulation analysis of the system has been accomplished on the soft platform. The brute-force searching and a code interception have been studied. The simulation results have shown that this system has better security.

DOI
10.1109/icmmt.2008.4540885

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The security of optical code division multi-access (OCDMA) system was analyzed, and the results indicate the hidden trouble of security. A scheme of multi-codes to be transmitted single-user information has been proposed, and single-user eavesdropping model has been simulated. The soft platform of system simulation was built by optisystem3.0 and MATLAB. The simulation analysis of the system has been accomplished on the soft platform. The brute-force searching and a code interception have been studied. The simulation results have shown that this system has better security.
The information eavesdropping techniques of spectral phase-coded OCDMA system were investigated.The soft- ware platform of the spectral phase-coded OCDMA system was built by using the Optisystem3.0 of the Optiwave Corporation and Matlab7.1,the model of user code interception in this system was put forward.The results of simulation based this model indicate that the address code of the user can be deciphered effectively by the eavesdropping scheme,the total system information can be intercepted,the spectral phase-coded OCDMA system isn1 secure as generally believed.
A multi-user cross-layer security network based on optical code division multiple access (OCDMA) and algorithmic cryptography is proposed, and its security performance is analyzed quantitatively for the first time. In this scheme, eavesdroppers have to not only intercept the optical code of OCDMA in physical-layer, but also break the algorithmic cryptography in data-layer. Thus, the information security will be enhanced effectively. Synchronous transmission system and asynchronous transmission system are analyzed respectively. It can be seen that the cross-layer security of asynchronous transmission is far greater than that of synchronous transmission when the number of users is large enough. OptiSystem simulation is used to investigate the image transmission in cross-layer security system. The transmission distance of single mode fiber is 100 km, and transmission rates are 10 Gbit/s and 1 Gbit/s respectively. It can be seen that legitimate user can recover original image correctly with matched decoder and correct encryption algorithm. However, eavesdroppers cannot recover the image correctly with matched decoder/wrong encryption algorithm or unmatched decoder/correct encryption algorithm. Therefore, our scheme can greatly enhance the security of image transmission system.
A novel technique to enhance the security of an optical code division multipleaccess (OCDMA) system against eavesdropping is proposed. It has been observed that whena single user is active in the network, an eavesdropper can easily sift the data beingtransmitted without decoding. To increase the security, a virtual user scheme is proposed andsimulated on a differential phase shift keying (DPSK) OCDMA system. By using the virtualuser scheme, the security of the DPSK-OCDMA system can be effectively improved and themultiple access interference, which is generally considered to be a limitation of the OCDMAsystem, is used to increase the confidentiality of the system.
Two different information intercepting schemes were designed to resolve the security problems on a 2D incoherent Optical Code Division Multiple Access(OCDMA) system.Firstly,it was assumed that the interceptors knew enough information such as the mode of en/decoding,the constructing mode of address code,the transmission rate of the system,the value and quantity of wavebands,etc.Then,the energy distributions of optical signals at different time and wavebands in the OCDMA system were achieved using an advanced optoelectronic detection technique.Finally,the address codes existing in the OCDMA system could be deciphered effectively employing the energy distributions.The functions of the two intercepting schemes were simulated on the software platform of an incoherent OCDMA system with seven users and seven Reed-Solomon(R-S) codes received randomly,experimental results show that the interceptors can decipher the user signature codes effectively when the two-code keying is employed as the modulation way of the OCDMA system or the multi-users are in existence simultaneously.The results indicate that the security problem still exists in the 2D incoherent OCDMA system.
We present the development of a multi-user cross-layer security network implemented on the optical code-division multiple access (OCDMA) with newly designed hybrid 2D-modified Walsh code (MWC) along with an algorithmic approach in cryptography domain. Minimum BER value is evaluated on the order of 10 − 50 using our designed MWC, which is comparatively lower than other existing codes. The security performance of the network was analyzed using the probability detection parameter, which was found to be superior apart from few other available existing codes. The enhancement of the quality and grade of security in this network eavesdropper can intercept the designed optical code of OCDMA in the physical layer. It compels one to break the security in the data-layer to access the original code. We also calculated the probability of successful data interception as a function of time complexity. Furthermore, we presented the simulation of the hybrid system using the OptiSystem simulator.