All-optical systems for binary to Gray code conversion and Gray code to binary conversion are proposed where the input
and output binary digits are expressed as the presence (=1) or the absence (=0) of a light signal. The intensity based
optical XOR logic operation is used here to develop the scheme.
The limitations of electronics in conducting parallel arithmetic, algebraic, and logic processing are well known. Very high-speed (terahertz) performance cannot be expected in conventional electronic mechanisms. To achieve such performance we can introduce optics instead of electronics for information processing, computing, and data handling. Nonlinear optical material (NOM) is a successful candidate in this regard to play a major role in the domain of optically controlled switching systems. The character of some NOMs is such as to reflect the probe beam in the presence of two read beams (or pump beams) exciting the material from opposite directions, using the principle of four-wave mixing. In image processing, edge extraction from an image is an important and essential task. Several optical methods of digital image processing are used for properly evaluating the image edges. We propose here a new method of image edge detection, extraction, and enhancement by use of AND-based switching operations with NOM. In this process we have used the optically inverted image of a supplied image. This can be obtained by the EXOR switching operation of the NOM.
In high-speed computation, optics has established itself as a successful candidate. Many proposals have already been adopted for performing arithmetic, algebraic, and logic operations using light as the information carrier. We propose a new method of optical data comparison with the proper use of nonlinear material applying the 1's compliment method. The binary optical data are manipulated here properly to achieve the required result.