Optical CDMA system based on amplifying fiber Bragg gratings chain

Abstract

In the presented paper frequency encoded Fiber-Optic Code Division Multiple Access (FO-CDMA) technique with broadband sources is investigated. The results of computer modeling of amplifying fiber Bragg gratings and the possibility of their implementation by using of consequent connected gratings as a coder in transmitter and correlator in receiver sides are shown. By applying of numerical models the performance analysis of frequency encoded FO-CDMA system is presented. Calculations are carried out for M-sequences and Walsh codes. It is shown that the choice of code sequence inside of the same family of codes, in the case of coded spectrum non uniformity, is an important factor for signal to noise ratio evaluation. The evaluation of the network operation distances under the fiber dispersion impact is also presented.