Indoor experiment of BER performance of optical CDMA system using optical ZCZ code

The optical ZCZ code, which is a set of pairs of binary and bi-phase sequences with zero correlation zone, can provide optical code division multiple access (CDMA) communication system without co-channel interference. We proposed the compact construction of a code generator and a bank of matched filters for this code. In this paper, we verified that this system can suppress cochannel interference and interference by shifting of optical axis by data multiplex transmission experiment of optical CDMA system using optical ZCZ codes which is called ZCZ-CDMA system, consisting of a infrared light emitting diode (LED), an avalanche photo diode (APD) module and field programmable gate array (FPGA) boards corresponding to 400,000 logic gates. As a result of data transmission experiment, optical ZCZ-CDMA system can suppress co-channel interference, but can´t remove completely co-channel interference, and interference by shifting of optical axis is suppressed from about -30 to 30 degrees.