All-optical time-domain multiplexing-demultiplexing scheme with nonlinear material

Role of optics in super-fast information processing

“…'Optics' has no Coulomb interaction and no cross-talk effect. So a high degree of inherent parallelism can be achieved from an 'optically run system' [1][2][3][4][5][6][7][8][9][10][11][12]. If information is coded with an optical signal it can be sent through a high electric or magnetic or through a high electromagnetic field without any kind of distortion.…”

“…In the last three decades thousands of theoretical and experimental works were reported where optics were used very nicely to implement logic, arithmetic, algebraic devices [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. The present author and his group proposed also several methods of such optical information processing [1][2][3][4][5][6][7][8][9][10][11][12]. We now discuss briefly few all-optical systems suitable for computation and data processing.…”

“…Optical bistable material, optical space light modulators, optical nonlinear materials, semiconductor optical amplifiers etc. were used very successfully to develop an optical switch [1][2][3][4][5][6][7][8]10,12]. These switches ultimately develop optical logic devices which are basic building blocks of a computer.…”

A method of optical implementation of frequency encoded all optical logic gates based on multiphoton processes in non linear material

“…the states of information 0 and 1 are represented by the presence and absence of optical signal which have many disadvantages (Dhar and Mukhopadhyay 2006;Mukhopadhyay 1992;Mukhopadhyay et al 2001Mukhopadhyay et al , 2004. The main disadvantage of the intensity encoding scheme is that, the intensity loss due to absorption causes reduction in the required prefixed intensity level (Roychowdhury et al 2005;Wu et al 1993) which can create problem in the channel selection. One can mention polarization encoding technique but this also not free from intensity loss dependent problem.…”

Implementation of an optical S-R flip-flop with polarization encoded light signal

“…The logical systems are to be operated certainly in digital mode otherwise the high amount of power is required to exploit the nonlinear switching character. Already several proposals of all-optical logic systems using this type of switching have been reported [10][11][12][13] .…”