In the past, the signal has been electrical, but increasingly it is composed of light pulses. The ones or zeroes in the bits are encoded by turning some signal on or off. To send something as simple as a phone message or as complicated as a picture, we digitize it by breaking it up into a series of binary bits, transmit the bits, and decode them at the other end to re-create the message or picture. The fundamentals of digital signal processing are straightforward. As photon is the ultimate unit of information with unmatched speed and with data package in a signal of zero mass, the techniques of computing with light may provide a way out of the limitations of computational speed and complexity inherent in electronics computing. In a pursuit to probe into cutting-edge research areas, the development of different ultra-fast all-optical switches has received considerable interest in recent years all over the world for future optical information processing. All-optical switching is an essential technology for transparent fiber optic networks and for all forms of optical signal processing as the optical interconnections and optical integrated circuits is immune to electromagnetic interference, and free from electrical short circuits. The dream of photonics is to have a completely all-optical technology. In these networks, it is desired to carry out switching, routing and processing in optical domain to avoid bottlenecks of optoelectronic conversions. Ultra high-speed optical network is developing rapidly as growing capacity demand in telecommunication system is increasing. In order to overcome the electronic bottlenecks and fully exploit the advantages of optics, it is necessary to move towards networks, where the transmitted data will remain exclusively in all optical domains without optical electrical optical (OEO) conversions. At the same time the Multi-valued logic (MVL) is also positioned as a coming generation technology that can execute arithmetic functions faster and with less interconnect than binary logic. Conservative and reversible logic gates are widely known to be compatible with revolutionary computing paradigms. Therefore an alternative technological solution to the problem of high speed information processing is needed, and unless we gear our thoughts toward a totally different pathway, we will not be able to further improve our information processing performance for the future. But, VLSI technology is approaching its fundamental limits in the sub-micron miniaturization process. Very Large Scale Integration (VLSI) technology has revolutionized the electronics industry and established the 20th century as the computer age. Massive parallelism, speed of operation, increased spatial density attracts in many ways the scientists, researchers and technologists. In last three to four decades, the philosophy, science and technical prospects enriched the scientific communities a lot. The field of computation and signal processing is growing day by day. Science and Technology is providing people all over the world with much better ways of communicating than ever before, and the winds of change have whipped up the desire to exchange more of everything from messages to movies.
0 Comments
Leave a Reply. |