Optical Computing Essay Example for Free

Optical Computing Essay Jainam Shah Kalol Institute Of Technology, Kalol, Gujarat, India. [emailprotected] Abstract—Optics has been used in computing for a number of years but the main emphasis has been and continues to be to link portions of computers, for communications, or more intrinsically in devices that have some optical application or component (optical pattern recognition, etc). Optical digital computers are still some years away, however a number of devices that can ultimately lead to real optical computers have already been manufactured, including optical logic gates, optical switches, optical interconnections, and optical memory. The most likely near-term optical computer will really be a hybrid composed of traditional architectural design along with some portions that can perform some functional operations in optical mode. Computing applications as a consequence of faster processing speed, as well as better connectivity and higher bandwidth. II. NEED FOR OPTICAL COMPUTING The pressing need for optical technology stems from the fact that today’s computers are limited by the time response of electronic circuits. A solid transmission medium limits both the speed and volume of signals, as well as building up heat that damages components. One of the theoretical limits on how fast a computer can function is given by Einstein’s principle that signal cannot propagate faster than speed of light. So to make computers faster, their components must be smaller and there by decrease the distance between them. This has resulted in the development of very large scale integration (VLSI) technology, with smaller device dimensions and greater complexity. The smallest dimensions of VLSI nowadays are about 0.08mm. Despite the incredible progress in the development and refinement of the basic technologies over the past decade, there is growing concern that these technologies may not be capable of solving the computing problems of even the current millennium. The speed of computers was achieved by miniaturizing electronic components to a very small micron-size scale, but they are limited not only by the speed of electrons in matter but also by the increasing density of interconnections necessary to link the electronic gates on microchips. The optical computer comes as a solution of miniaturization problem. Optical data processing can perform several operations in parallel much faster and easier than electrons. This parallelism helps in staggering computational power. For example a calculation that takes a conventional electronic computer more than 11 years to complete could be performed by an optical computer in a single hour. Any way we can realize that in an optical computer, electrons are rep laced by photons, the subatomic bits of electromagnetic radiation that make up light. I. INTRODUCTION With the growth of computing technology the need of high performance computers (HPC) has significantly increased. Optics has been used in computing for a number of years but the main emphasis has been and continues to be to link portions of computers, for communications, or more intrinsically in devices that have some optical application or component (optical pattern recognition etc.) Optical computing was a hot research area in 1980’s.But the work tapered off due to materials limitations that prevented opt chips from getting small enough and cheap enough beyond laboratory curiosities. Now, optical computers are back with advances in self-assembled conducting organic polymers that promise super-tiny of all optical chips. Optical computing technology is, in general, developing in two directions. One approach is to build computers that have the same architecture as present day computers but using optics that is Electro optical hybrids. Another approach is to generate a completely new kind of computer, which can perform all functional operations in optical mode. In recent years, a number of devices that can ultimately lead us to real optical computers have already been manufactured. These include optical logic gates, optical switches, optical interconnections and optical memory. Current trends in optical computing emphasize communications, for example the use of free space optical interconnects as a potential solution to remove ‘Bottlenecks’ experienced in electronic architectures. Optical technology is one of the most promising, and may eventually lead to new III. SOME KEY OPTICAL COMPONENTS FOR COMPUTING The major breakthroughs on optical computing have been centered on the development of micro-optic devices for data input. A. VCSEL (Vertical Cavity Surface Emitting Laser) VCSEL (pronounced ‘vixel’) is a semiconductor vertical cavity surface emitting laser diode that emits light in a cylindrical beam vertically from the surface of a fabricated wafer, and offers significant advantages when compared to the edge-emitting lasers currently used in the majority of fiber optic communications devices. The principle involved in the operation of a VCSEL is very similar to those of regular lasers. Fig. 2. Optical Interconnection Of Circuit Boards Using Vcsel And Photodiode VCSEL convert the electrical signal to optical signal when the light beams are passed through a pair of lenses and micromirrors. Micromirrors are used to direct the light beams and this light rays is passed through a polymer waveguide which serves as the path for transmitting data instead of copper wires in electronic computers. Then these optical beams are again passed through a pair of lenses and sent to a photodiode. This photodiode convert the optical signal back to the electrical signal. B. SLM (Spatial Light Modulators) SLM play an important role in several technical areas where the control of light on a pixel-by-pixel basis is a key element, such as optical processing and displays. 1) SLM For Display Purposes Fig. 1. Two semiconductor materials sandwiching an active layer There are two special semiconductor materials sandwiching an active layer where all the action takes place. But rather than reflective ends, in a VCSEL there are several layers of partially reflective mirrors above and below the active layer. Layers of semiconductors with differing compositions create these mirrors, and each mirror reflects a narrow range of wavelengths back in to the cavity in order to cause light emission at just one wavelength. For display purposes the desire is to have as many pixels as possible in as small and cheap a device as possible. For such purposes designing silicon chips for use as spatial light modulators has been effective. The basic idea is to have a set of memory cells laid out on a regular grid. These cells are electrically connected to metal mirrors, such that the voltage on the mirror depends on the value stored in the memory cell. A layer of optically active liquid crystal is sandwiched between this array of mirrors and a piece of glass with a conductive coating. The voltage between individual mirrors and the front electrode affects the optical activity of liquid crystal in that neighborhood. Hence by being able to individually program the memory locations one can set up a pattern of optical activity in the liquid crystal layer. C. Smart Pixel Technology Smart pixel technology is a relatively new approach to integrating electronic circuitry and optoelectronic devices in a common framework. The purpose is to leverage the advantages of each individual technology and provide improved performance for specific applications. Here, the electronic circuitry provides complex functionality and programmability while the optoelectronic devices provide high-speed switching and compatibility with existing optical media. Arrays of these smart pixels leverage the parallelism of optics for interconnections as well as computation. A smart pixel device, a light emitting diode under the control of a field effect transistor can now be made entirely out of organic materials on the same substrate for the first time. In general, the benefit of organic over conventional semiconductor electronics is that they should lead to cheaper, lighter, circuitry that can be printed rather than etched. D. WDM (Wavelength Division Multiplexing) Wavelength division multipl exing is a method of sending many different wavelengths down the same optical fiber. Using this technology, modern networks in which individual lasers can transmit at 10 gigabits per second through the same fiber at the same time. which interact with light and modulate its properties. Several of the optical components require efficient-nonlinear materials for their operations. What in fact restrains the widespread use of all optical devices is the in efficiency of currently available nonlinear materials, which require large amount of energy for responding or switching. Organic materials have many features that make them desirable for use in optical devices such as 1) High nonlinearities 2) Flexibility of molecular design 3) Damage resistance to optical radiations Some organic materials belonging to the classes of phthalocyanines and polydiacetylenes are promising for optical thin films and wave guides. These compounds exhibit strong electronic transitions in the visible region and have high chemical and thermal stability up to 400 degree Celsius. Polydiacetylenes are among the most widely investigated class of polymers for nonlinear optical applications. Their subpicosecond time response to laser signals makes them candidates for high-speed optoelectronics and information processing. To make thin polymer film for electro-optic applications, NASA scientists dissolve a monomer (the building block of a polymer) in an organic solvent. This solution is then put into a growth cell with a quartz window, shining a laser through the quartz can cause the polymer to deposit in specific pattern. V. ADVANCES IN PHOTONIC SWITCHES Logic gates are the building blocks of any digital system. An optical logic gate is a switch that controls one light beam by another; it is ON when the device transmits light and it is OFF when it blocks the light. Fig. 3. a. Wave length division multiplexing b. A WDM System WDM can transmit up to 32 wavelengths through a single fiber, but cannot meet the bandwidth requirements of the present day communication systems. So nowadays DWDM (Dense wavelength division multiplexing) is used. This can transmit up to 1000 wavelengths through a single fiber. That is by using this we can improve the bandwidth efficiency. IV. ROLE OF NLO IN OPTICAL COMPUTING The role of nonlinear materials in optical computing has become extremely significant. Non-linear materials are those, Fig. 4. Optical AND-logic gate To demonstrate the AND gate in the phthalocyanine film, two focused collinear laser beams are wave guided through a thin film of phthalocyanine. Nanosecond green pulsed Nd:YAG laser was used together with a red continuous wave (cw) He-Ne beam. At the output a narrow band filter was set to block the green beam and allow only the He-Ne beam. Then the transmitted beam was detected on an oscilloscope. It was found that the transmitted He-Ne cw beam was pulsating with a nanosecond duration and in synchronous with the input Nd:YAG nanosecond pulse. This demonstrated the characteristic table of an AND logic gate. A. Optical and Gate In an optical NAND gate the phthalocyanine film is replaced by a hollow fiber filled with polydiacetylene. Nd:YAG green picoseconds laser pulse was sent collinearly with red cw He-Ne laser onto one end of the fiber. At the other end of the fiber a lens was focusing the output on to the narrow slit of a monochromatic with its grating set for the red He-Ne laser. When both He-Ne laser and Nd:YAG laser are present there will be no output at the oscilloscope. If either one or none of the laser beams are present we get the output at the oscilloscope showing NAND function. faster read-out rates. This research is expected to lead to compact, high capacity, rapid-and random-access, and low power and low cost data storage devices necessary for future intelligent spacecraft. The SLMs are used in optical data storage applications. These devices are used to write data into the optical storage medium at high speed. Fig. 6. Optical Disk More conventional approaches to holographic storage use ion doped lithium niobate crystals to store pages of data. For audio recordings ,a 150MBminidisk with a 2.5- in diameter has been developed that uses special compression to shrink a standard CD’s640-MB storage capacity onto the smaller polymer substrate. It is rewritable and uses magnetic field modulation on optical material. The mini disc uses one of the two methods to write information on to an optical disk. With the mini disk a magnetic field placed behind the optical disk is modulated while the intensity of the writing laser is held constant. By switching the polarity of the magnetic field while the laser creates a state of flux in the optical material digital data can be recorded on a single layer. As with all optical storage media a read laser retrieves the data. A. Working The 780nm light emitted from AlGaAs/GaAs laser diodes is collimated by a lens and focused to a diameter of about 1micrometer on the disk. If the re is no pit where the light is incident, it is reflected at the Al mirror of the disk and returns to the lens, the depth of the pit is set at a value such that the difference between the path of the light reflected at a pit and the Fig. 5. Optical NAND-logic gate VI. OPTICAL MEMORY In optical computing two types of memory are discussed. One consists of arrays of one-bit-store elements and other is mass storage, which is implemented by optical disks or by holographic storage systems. This type of memory promises very high capacity and storage density. The primary benefits offered by holographic optical data storage over current storage technologies include significantly higher storage capacities and path of light reflected at a mirror is an integral multiple of halfwavelength consequently, if there is a pit where light is incident, the amount of reflected light decreases tremendously because the reflected lights are almost cancelled by interference. The incident and reflected beams pass through the quarter wave plate and all reflected light is introduced to the photodiode by the beam splitter because of the polarization rotation due to the quarter wave plate. By the photodiode the reflected light, which as a signal whether, a pit is on the disk or not is changed into an electrical signal. VII. APPLICATIONS 1) High speed communications: The rapid growth of internet, expanding at almost 15% per month, demands faster speeds and larger bandwidth than electronic circuits can provide. Terabits speeds are needed to accommodate the growth rate of internet since in optical computers data is transmitted at the speed of light which is of the order of 3.10*8 m/sec hence terabit speeds are attainable. 2) Optical crossbar interconnects are used in asynchronous transfer modes and Shared memory multiprocessor systems. 3) Process satellite data. VIII. MERITS 1) Optical computing is at least 1000 to 100000 times faster than today’s silicon machines. 2) Optical storage will provide an extremely optimized way to store data, with space requirements far lesser than today’s silicon chips. 3) Super fast searches through databases. 4) No short circuits, light beam can cross each other without interfering with each other’s data 5) Light beams can travel in parallel and no limit to number of packets that can travel in the photonic circuits. 6) Optical computer removes the bottleneck in the present day Communication system IX. DRAWBACKS 1) Today’s materials require much high power to work in consumer products, coming up with the right materials may take five years or more. 2) Optical computing using a coherent source is simple to compute and understand, but it has many drawbacks like any imperfections or dust on the optical components will create unwanted interference pattern due to scattering effects. Incoherent processing on the other hand cannot store phase information. X. SOME CURRENT RESEARCH High performance computing has gained momentum in recent years, with efforts to optimize all the resources of electronic computing and researcher brain power in order to increase computing throughput. Optical computing is a topic of current support in many places, with private companies as well as governments in several countries encouraging such research work. A group of researchers from the University of Southern California, jointly with a team from the University of California, los angles, have developed an organic polymer with a switching frequency of 60 GHz. This is three times faster than the current industry standard, lithium niobate crystal based device. Another group at brown university and the IBM, Alma den research center has used ultrafast laser pulses to build ultra fast data storage devices. This group was able to achieve ultra fast switching down to 100 picoseconds. In Japan , NEC has developed a method for interconnecting circuit boards optically using VCSEL arrays .Another researchers at NTT have designed an optical backplane with free-space optical interconnects using tunable beam deflectors and mirrors. The project achieved 1000 interconnections per printed circuit board; with a throughput ranging from 1 to 10 Tb/s. XI. FUTURE TRENDS The Ministry of Information Technology has initiated a photonic development program. Under this program some funded projects are continuing in fiber optic high-speed network systems. Research is going on for developing Fig.7. Use of optical devices in future New laser diodes, photo detectors, and nonlinear material studies for faster switches. Research efforts on an particle thin film or layer studies for display devices are also in progress. At the Indian Institute of Technology (IIT), Mumbai, efforts are in progress to generate a white light source from a diode case based fiber amplifier system in order to provide WDM communication channels. XII. CONCLUSION Research in optical computing has opened up new possibilities in several fields related to high performance computing, high-speed communications. To design algorithms that execute applications faster, the specific properties of optics must be considered, such as their ability to exploit massive parallelism, and global interconnections. As optoelectronic and smart pixel devices mature, software development will have a major impact in the future and the ground rules for the computing may have to be rewritten. XIII. REFERENCES [1] [2] See for example: Chemical and Engineering ews, Photonic Crystals. Assembled on Chip, 79(47), 31 (2001). P. Boffi, D. Piccinin, M.C. Ubaldi, (Eds.), Infrared Holography for Optical Communications— echniques,MaterialsandDevices,SpringerTopics in Applied Physics: Vol 86, July 2002. Alain Goulet, Makoto Naruse, and Masatoshi Ishikawa, Simple integration technique to realize parallel optical interconnects: implementation of a pluggable two-dimensional optical data link, Applied Optics 41, 5538 (2002) Tushar Mahapatra, Sanjay Mishra, Oracle Parallel Processing, OReilly Associates, Inc., Sebastopol, California, USA, 2000. S. J. van Enk, J. McKeever, H. J. Kimble, and J. Ye, Cooling of a single atom in an optical trap inside a resonator, Phys. Rev. A 64, 013407 (2001). A. Dodabalapur, Z. Bao, A. Makhija, J. G. Laquindanum, V. R. Raju, Y. Feng, H. E. Katz, and J. Rogers, Organic smart pixels, Appl. Phys. Lett. 73, 142 (1998). Henning Sirringhaus, Nir Tessler, and Richard H. Fr iend, Integrated Optoelectronic Devices Based on Conjugated Polymers, Science 280, 1741 (1988).

Scenario Planning Essay -- Business, Strategic Organizational Plannin

Nowadays business leaders need to understand environment which is going to be more complex. Organisations are open system so that organisations need to adapt environment which they operate in. Matridakis, Hogarth and Gaba (2010) argued that traditional tools did not fit well to new complex environment. Although complex environment and level of uncertainty cannot be explained by forecasting, most of the traditional method including strategic planning and organizational development method are tried to use past trends and forecast future. Therefore, scenario planning gets more recognition from the manager whose company operates in such kind of volatile, uncertain environment. Kahane (1992) (Cited in Charmack et al 2001) scenario planning is an effective method for understand critical future uncertainties and investigating drawbacks of the organisations. There are so many aspect and definition of scenario planning. â€Å"Scenarioâ€Å" means an outline or synopsis of a play. The word scenario is derived from the Italian word scena, scene, that comes from the Latin scaena. According to Schwartz (1998:6) scenarios present alternative of future. Kahn and wiener (1967) defined â€Å" Scenarios are narrative description of future†(Cited in AC/UNU Millennium Project) Porter (1985) defined scenarios â€Å"an internally consistent view of what the future might turn to be – not forecast but one possible future outcome† There is big argument on the scenarios, whether it is static or dynamic. Becker (1983) defined that scenarios are people imaging for future like photo. Although Wack (1985), Schoemaker (1991), van der heijden (1996) supported dynamic view of scenarios and they stated that Scenarios are the process of evolution that was linked to strategic devel... ... In conclusion, scenarios are related to future, according to some of the authors scenarios have a static vision, but for the others scenarios include dynamic aspects. Scenario planning is process of positioning plausible scenarios. Some of the author in this field using different name for scenario planning such as scenario thinking, scenario based planning. It includes two sides, first scenario development and then strategy development. O’brien (2003) stated that scenario planning is a soft problem structuring method and qualitative approach. Schoemaker (1997) stated that scenario planning allows more subjective element and macro environment variable than computer simulation programs. Also these methods include system dynamics and risk analysis. It is easy to conclude that scenario planning is a managerial tool of strategic thinking (Bood and Postma 1998).

Lgbt Organizations

LGBT Supportive Organizations The first website I visited was called No Longer Silent: Clergy for Justice. Their main focus was on an alternative Christian perspective on the issue of homosexuality. They basically believed in advocating justice for all, especially Gays, Lesbians, Bisexuals, and Transgendered persons. The support that I see they give is a sense of belonging. They give the support that many seek with is religious acceptance. This organization is very unique because for many years the church has never really given gays a home; No Longer Silent gives us that place to go to for moral support.Their website gave educational materials like articles on news pertaining to our community. Also materials like scriptures from that give the LGBT community, who are not familiar with the bible; some interpretations and teachings. The next website that I visited was called Gay, Lesbian, and Straight Education Network. Their focus was on assuring that each member of every school commun ity is valued and respected regardless of sexual orientation or gender identity/expression. They give support by giving students internet resources on bullying. They also support our LGBT community by starting their campaign â€Å"Think before you speak†.It helps us inform the world that words do hurt and helps in the prevention of anti-gay language. Their website gives educational materials like Facts about Sexual Orientation. They even give resources like crisis support and advocacy. Then I visited the website for Equality Arizona. Their focus is to secure, protect and defend the rights and welfare of LGBT people in Arizona. The support they give is huge throughout the state of Arizona. They are the ones that fight for our rights. They support us in legal stand points like marriage and adoption.As for educational materials, they give many blogs on how our issues are coming along. For example: They explain how our local LGBT leaders respond to President Obama’s Declar ation of Support for Marriage Equality. Next website visited was PFLAG Phoenix. Their focus is on celebrating diversity and envisions a society that embraces everyone, including those of diverse sexual orientations and gender identities. Their support is very important to our community. Their support is being our family with open arms. It gives parents and families a place where they can show their support for us.They have a lot of educational material for not only our LGBT community but for our families too. It gives terminology, some theories, and most of all many answers to questions. The last website I visited was 1n10. Their focus is on providing our youth with the tools to improve their self-esteem and help with acceptance of who they are. Their support is how they create a safe space, mentally and physically, for youth ranging for 14-24. Their support also includes helping teens by providing homeless shelters and suicide prevention crisis lines. Educational materials were sca rce.I really didn’t find anything other than a lot of resources for different problems our LGBT youth may encounter. To say the truth, I never knew any of these organizations existed. The one that melted my heart the most would be the PFLAG website. Reason being is all LGBT people look for family acceptance. All the pictures of the protesters made me smile. The 1n10 website also struck me because to me the youth is our future. If they are not educated or helped with open arms, society just might take steps back instead of forward. Our adolescent years are crucial especially being LGBT.The Equality Arizona website gives me hope that one day they will push far enough to make Marriage and Adoption legal for us. I think that step would push us through the red tape at the finish line. No Longer Silent is another milestone. I learned that they gives us a place of religion that doesn’t outcast us or tell us we should change because if we don’t we’ll go to hell. That’s important to me because during my coming out I lost faith in religion. The GLSEN website shows me that one day LGBT could one day cease forever. All of these websites posed as a great learning experience.

Civil Rights And Freedom Of Speech - 1569 Words

Civil rights and liberties are protections granted to United States citizens through the Constitution. The key difference between the two is that civil rights are rights that need protection by the government. Examples of civil rights include laws ensuring people s’ physical integrity and safety, laws to make sure that people are not forced into labor, and laws providing equal access to health care, education, culture, etc. among others. These are important because they ensure that every citizen receives equal treatment, regardless of who they are. Civil liberties on the other hand, are rights that need protection from the government. Examples of civil liberties include freedom of speech, press, and assembly, the right to vote, and the right to equality in public places, along with others. They are important because they guard the rights and freedom of citizens of the United States. Without them, we would not be able to have certain rights such as freedom of speech, freedom of press, fair trials, or other essential liberties that make us uniquely American. A current issue that deals with our civil rights and liberties is the topic of gay rights, specifically gay marriage. This is a controversial issue that has become prominent in recent years due to members of the LGBT community taking a stand and making sure their voices are being heard. Gay rights are an important topic because in some states, it is illegal to marry a person of the same sex, which some may argue isShow MoreRelatedViolation Of Civil Rights And Freedom Of Speech1263 Words   |  6 PagesCarol Jones EDLD 7531 Georgia Southern University Citation: Mt. Healthy City School District Board of Education et al v. 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