Dispersion-division multiple access: A temporal holography-based method

Abstract

Multiple access methods are the backbone of today’s most communication systems. Increasing the efficiency of these schemes is a challenging engineering task. This paper introduces dispersion-division multiple access, a novel multiple-access technique that can improve the efficiency of multiple-access communication systems. When two (or more) pulses experience different Group Delay Dispersion (GDD) values on a propagation medium, they can be synchronized to overlap in time for combining the phase and amplitude of those pulses. This paper suggests the recoverability of these pulses while being mixed in the transmitter by propagating the combined pulse in a negative Group Velocity Dispersion (GVD)medium with GDD values corresponding to the minus of the corresponding GDD values in the input. This method shares similarities with coherent holography, with the only difference being that in spatial coherent holography, the combined wave-fronts are recorded in a plate, encoding the phase information of a three-dimensional object into intensity. However, the proposed method does not record the combined pulse and immediately sends it through the channel. In addition to the excellent simplicity provided by this method, the performed simulations also validate its notable performance in increasing the number of channels under low Bit Error Rates (BER).