Optical CDMA system based on amplifying fiber Bragg gratings chain

Summary form only given. There has been increasing interest in the design and analysis of fiber-optic code division multiple access (FO-CDMA) techniques (also called spread-spectrum techniques) for local area networks. This is due to the recognized advantages of FO-CDMA systems over traditional multiple access methods. Such system can utilize the high bandwidth offered by modern optical fibers. Their asynchronous operation nature is very efficient in the burst traffic environment. 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 as a correlator in receiver sides are shown. By applying numerical models the performance analysis of frequency encoded fiber-optic 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 operation distances under the impact of fiber dispersion by using the well-known differentiated three-term Sellmeier equation are also calculated