Interception of 2D incoherent optical code division multiple access system
Jing Yang
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.
Optics and Precision Engineering•Jan 1, 2008•0 citations