CROSSTALK PERFORMANCE OF COHERENT TIME-ADDRESSED PHOTONIC CDMA NETWORKS

We report a theoretical investigation of the crosstalk performance of photonic code-division multiple-access (CDMA) networks that are based on coherent matched filtering of optical pulses, We describe the impor tance of time gating in the reduction of noise in spread-time CDMA sch emes, We give guidelines for the selection of codes in coherent matche d filtering, and give a code set that produces low crosstalk, We prese nt calculated bit-error rates (BER's) that show for individual user da ta rates in the gigabit per second range that crosstalk limits aggrega te bit rates to the tens of gigabits per second range, This level of p erformance is a significant improvement over purely incoherent spread- time approaches. Such low crosstalk suggests that this scheme may be t he first spread-time photonic CDMA scheme that is not crosstalk-limite d.