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International Conference on Microwave and Millimeter Wave Technology (ICMMT)

Code interception technology for spectral phase-encoded OCDMA system by using super-structured fiber bragg grating (SSFBG)

Wu Pan, Jing Yang, Jing Qiao, Bing Long

Published Apr 1, 2008• 0 citations
Publisher

Abstract

The code interception of spectral phase-encode optical code division multiple access (OCDMA) system is studied. A theoretical model of code interception based on SSFBG is presented and then the eavesdropping principle is also analyzed in theoretically. The result of eavesdropping is simulated by Optisystem3.0 and Matlab7.1. The simulation results have shown that the information of spectral phase-encoded OCDMA system can be eavesdropped effectively by using this model.

DOI
10.1109/icmmt.2008.4540884

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The code interception of spectral phase-encode optical code division multiple access (OCDMA) system is studied. A theoretical model of code interception based on SSFBG is presented and then the eavesdropping principle is also analyzed in theoretically. The result of eavesdropping is simulated by Optisystem3.0 and Matlab7.1. The simulation results have shown that the information of spectral phase-encoded OCDMA system can be eavesdropped effectively by using this model.
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.
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.
Security Improvement Using ±π/2\pm\pi/2±π/2-Phase-Shifted SSFBG En/Decoder in Time-Spreading OCDMA
The existence of dips in the waveform encoded by 0/π-phase-shifted superstructured fiber Bragg grating (0/π -SSFBG) allows eavesdroppers to extract code sequence straightforwardly. In this letter, the code extraction technique for 0/π-SSFBG is summarized and demonstrated. To address this security issue, we propose using ±π/2-phase-shifted ±π/2-SSFBG as encoder/decoder to improve security in time-spreading optical code-division multiple-access. The security and coding performances for both ±π/2-SSFBG and 0/π-SSFBG are compared; ±π/2-SSFBG exhibits improved security and better coding performance. The influence of input pulse over the security performance for ±π/2 -SSFBG is discussed. Short input pulse can improve the security of the encoded signal.
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.
This paper puts forward a cross-layer security model for optical networks using Spectral Amplitude CodingOptical Code Division Multiple Access (SAC-OCDMA) as a combination with optical cryptography. The new architecture provides data confidentiality through two layers of protection: (1) physical layer Bragg filter-based spectral encoding and (2) data layer XOR logic gate-based encryption through a Semiconductor Optical Amplifier Mach-Zehnder Interferometer (SOA-MZI). In this method, unauthorized users must bypass both the spectral coding and optical encryption mechanisms, which significantly strengthen transmission security. The system is simulated using OptiSystem software, and the results show an improved perfor- mance of the Bit Error Rate (BER) and Quality (Q) factors. This hybrid optical security model demonstrates high potential for applications in secure fiber-optic communication networks.
Aiming at the current eavesdropping security issues in the physical layer of optical networks, a new hybrid optical encryption scheme based on Highly Nonlinear Fiber (HNLF) and Super Structured Fiber Bragg Grating (SSFBG) is proposed in this paper. In the scheme, degenerate Four Wave Mixing (FWM) is used to encrypt and decrypt user information, and optical coding technology is used to encode and decode the key information. Therefore, the encoding and secret transmission of the key signal can be realized simultaneously. The security of the system is measured by comparing the waveform of the encrypted signal transmitted in the channel with the waveform of the original transmitted signal, and the effectiveness of the system is measured by the bit error rate at the system receiver side. The simulation results show that the frequency and phase of the user data information are disturbed, and the optical power of the encoded key signal is as low as -34.4 dBm. Therefore, the eavesdropping channel cannot obtain effective data information nor detect the key signal, which demonstrates the safe transmission of Quadrature Phase Shift Keying (QPSK) signal.