Optical Logic NOT, AND, NAND, OR and NOR Elements

IET Circuits, Devices & Systems, 2011

Elementary blocks, performing logic operations, are the building elements for more complex subsystems implementing all-optical digital processing. They can potentially enable next generation optical networks and optical computing, overcoming the limitations of the electronics bandwidth, also guaranteeing scalability, transparency, easy reconfigurability and modularity. Finally, integrated technologies can reduce power consumption, footprint and cost.

2011

This research paper is about advancement in Optical Computing an emerging field of computer design and hardware with very fast speed and performances. The optical Computing (also known as Photonic computing) is a technique based on photons of visible light or infrared region rather than Electrons flowing in electric current which are used to perform digital Computations using electronic logic gates. In this technique we are using logic gates which will show the logic transition using photons of visible light which forms the basis of our research. We studied here that we can achieve a logic gate transition through photons of light employed using chemical compounds which behalves accordingly to incident photons of light on it. This photonic logic will be used to make optical transistors. This will in turn used to make processors working on the principal of light rather than on the principal of electric current.

Optik, 2011

Logic gates are the fundamental building blocks in any digital data processing system. Several all optical logic operations are already proposed by scientists and technologists. Here the authors proposed a new method of all optical logic operation based on nonlinear directional coupler. Effective optical switching is achieved by modifying the coupling length between the coupler waveguides by means of an optical signal.

2011

This paper is dedicated to full-optical logical NOT, AND and NAND gates. In the first section are described logical functions based on Mach-Zehnder interferometric structure. The second part deals with full-optical logical gate AND, that utilizes TOAD structure. The last one is focused on the exploitation of logical gate AND for optical head separation from payload data. Simulations and final design were realized in simulation environment Virtual Photonic close up to 150 Gb.s bit rate.

Applied Optics, 1986

The results of investigations into the feasibility of incorporating optically bistable elements into an optical processor are presented. Two forms of bistable device, etalons of InSb and interference filters containing ZnSe, have been used in the first experimental demonstrations of digital all-optical circuits. It is shown that cw optical bias beams may be used to hold logic gates sufficiently close to their switch point that the available signal gain allows one to realize indefinitely extensible optical logic. The results of such experiments are presented and the implications they have on the field of optical computing are discussed. It is concluded that parallel arrays can give significantly high rates of digital operations.

Optik - International Journal for Light and Electron Optics, 2014

Semiconductor optical amplifier (SOA) is used for different successful frequency based switching operations. In this paper the authors describe the simulation study of the performances of SOA in various optical switches like frequency conversion, add-drop multiplexer and frequency encoded optical NOR gate, which is one the most important gates in logic family as it is known as one of the universal logic gates. Again, the controlled optical NOR logic operation with semiconductor optical amplifier is also proposed in this paper.

Applied Optics, 2011

Logic units are the building blocks of many important computational operations likes arithmetic, multiplexer-demultiplexer, radix conversion, parity checker cum generator, etc. Multifunctional logic operation is very much essential in this respect. Here a programmable Boolean logic unit is proposed that can perform 16 Boolean logical operations from a single optical input according to the programming input without changing the circuit design. This circuit has two outputs. One output is complementary to the other. Hence no loss of data can occur. The circuit is basically designed by a 2 × 2 polarization independent optical cross bar switch. Performance of the proposed circuit has been achieved by doing numerical simulations. The binary logical states 0; 1 are represented by the absence of light (null) and presence of light, respectively.

IOP, 2019

An compact 3 × 3 polydiacetylene crystalian multimode interference (MMI) coupler simulated using the nonlinear modal propagation method (NMPA) is proposed as a conventional-single structure to fulfill the functionality of all kind of logic gates based on OOK format. This novel approach has potential application in all-optical logic gates for Boolean logic signal processing devices. We consider three categories of input arrangements to investigate six logic output situations such A side-input control of the gate operations with an opposite-side output is demonstrated to produce all the binary functions. Therefore, logic gates operations are optimized via the output width, where the contrast ratio between the ON and OFF states determines the efficiency of the all-optical gates, such as, contrast ratios lying from 22 dB to 12 dB on the optimized output width.

Advances in Optical Technologies, 2014

The paper reviews the current status and designs of all-optical gates. Various schemes with and without semiconductor optical amplifiers are discussed and compared. The optical gates are classified according to their design structures. It is divided into two major divisions that is, nonsemiconductor optical amplifier based gates and semiconductor optical amplifier based gates. In nonsemiconductor optical amplifier based gates, different schemes have been proposed to create non-linearity which is discussed. The semiconductor optical amplifier based gates of different design structures are discussed to show the probe pulse that is modulated in different ways to obtain results.

Optik - International Journal for Light and Electron Optics, 2006

Twenty years ago IBM physicist Robert Keyes published a paper entitled ''Optical Logic-in the light of computer technology.'' It caused an instant furor in the fledgling optical logic community. Now, 20 years after that devastating critique, the field of optical logic has grown enormously. There are literally thousands of papers. Many of them are collected in a bibliography given here. Was Keyes' critique wrong? Have opticists simply ignored what Keyes pointed out? Have new developments made some of his remarks not quite so relevant? We argue here that Keyes was and still is mostly correct, but that may change in a few years Many researchers have indeed simply ignored what he said New developments in both optical logic and its applications open niches for optical logic that Keyes did not (and probably could not) anticipate New and anticipated developments in electronics may increase the role for optics r