Zeitschrift für Laser, Optik und Photonik

Optical Security System using Random Gratings for Optical Coding and Multiplexing

Abstract

Mohammad Sohail

In the modern age, due to the rapid development of communication techniques, individuals can be secured by the application optical signal processing technology. In this paper, we have proposed a new technique that is using a multiplexing tactic for optical encrypting mechanism to secure the individuals for multiple users. Here in this paper, we are modifying the classical joint transform correlator to provide more security which is easy in implementation. Our proposed technique that is using encoding and decoding procedure provides more security than the previous techniques. In this approach, amplitude random mask was used for encoding as well as decoding procedure but in a holographic format that modulates the input information and enables us to recover the input information from modulated signal which is difficult for other people. For encoding process, we project the spectrum of the scattered beam of the amplitude random mask on the object that capture the object information in random manner and Fourier transformation gives the spectrum of the coded object. The split beam of the mask is multiplexed to the coming spectrum at the CCD plane for the decoding process unlike the classical joint transform architecture discussed. There is no need of the mechanical moment of the mask. This technique is more efficient than the techniques available in the literature because the advantage of the method introduced in this paper is the decryption performed using the same key code. We present a theoretical explanation, along with computer simulations results that support our proposal.