Title :
Simple Code Switching Scheme for Security Enhancement of OCDMA Communication System
Author :
Si, Zhijian ; Yin, Feifei ; Chen, Hongwei ; Xie, Shizhong
Author_Institution :
Dept. of Electron. Eng., Tsinghua Univ., Beijing, China
Abstract :
A simple code switching scheme for security enhancement of an optical code-division multiple-access (OCDMA) communication system is proposed. The scheme avoids the replacement of all the encoders and decoders in the system and all users´ codes are changed by only tuning the center wavelength of the laser source. Each en/decoder contains multiple codes which are nonoverlapping in the spectrum. The scheme is demonstrated in a proof-of-principle transmission experiment. There are three codes on the encoder and decoder pairs, one 2-D code and two 1-D bipolar gold codes with chip number of 63 and 127, respectively. All three codes are decoded successfully after 12.7-km single-mode fiber link.
Keywords :
Gold codes; code division multiple access; decoding; encoding; laser tuning; light transmission; optical communication equipment; optical fibre communication; optical links; optical switches; telecommunication security; 1D bipolar gold codes; 2D code; OCDMA communication system; code switching; decoders; distance 12.7 km; encoders; laser source; optical code-division multiple-access; security enhancement; single-mode fiber link; transmission experiment; wavelength tuning; Bragg gratings; Decoding; Laser tuning; Multiaccess communication; Nonlinear optics; Security; Fiber Bragg grating (FBG); optical code-division multiple-access (OCDMA); security;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2011.2156779
