Applications of Semiconductor lasers

Applications of Semiconductor lasers Abstract- Semiconductor lasers have the potential to meet the demands of next generation high speed optical network applications and also have great impact on various other technology domains. Its low cost, easy wavelength tune ability, low power consumption and pure output make it ideal for optical communication applications. This paper is a review of the merits, demerits, current applications, commercial availability and future directions of semiconductor lasers in optical communication. Comparative analysis of these semiconductor lasers with respect to various parameters also been conducted. Keywords: Semiconductor lasers, Fabry-Perot laser, Distributed feedback (DFB) laser, External Cavity Diode Lasers (ECDL), Multi Quantum Well (MQW) laser, Vertical Cavity Surface Emitting Lasers (VCSEL) i.Introduction The semiconductor lasers were discovered in 1962 by Robert Hall and his team members [1, 2]. With the advent of this technology patents and articles started to publish on this technology but at that time this technology was not mature enough to realize the dreams of the scientists, engineers and physicist. But with advancement in the field and the enabling technologies soon made it possible to produce inexpensive commercially available semiconductor laser. The invention of semiconductor lasers not only revolutionizes the optical communication but it has many applications in other domains also. Semiconductor lasers are one of the popular optical communication light source for data transmission. They are supposed to be the laser of the future, because of their compactness in size, easy integration, more output power, optical pumps for solid-state lasers (primary light source i.e laser diode pumps another solid state lasers) and their rapid improvement. Semiconductor lasers are essentially diodes which produces coherent light through the process of stimulated emission. They uses semiconductor as a gain medium. The gain medium is pumped by an external source, which is electrical in nature in case of semiconductor lasers [3]. As they are basically p-n junctions, so they are compact and can be fabricated on large scale by the use of advance semiconductor IC technology. Semiconductor lasers are very efficient in converting electrical power into optical power [10]. In section.II basic types of semiconductor lasers are described in terms of their basic working procedure, advantages, disadvantages, commercial availability future directions and applications. Section.III produces the comparison of semiconductor lasers with respect to various parameters and section.IV contains the conclusion. II. Types of semiconductor lasers Following are the basic types of semiconductor lasers Fabry Perot (FP) Lasers Distributed Feedback (DFB) lasers Multi Quantum Well (MQW) laser External Cavity Diode Lasers (ECDL) Vertical Cavity Surface Emitting Lasers (VCSEL) A. Fabry-Perot (FP) lasers In FP lasers, mirrors create the right condition for the lasing to occur. Resonate cavity is formed when two mirrors are put in front of each other. The bouncing of light will take place between these two mirrors, the distance between these two mirrors are adjusted in such a way that this distance is the integral multiple of half wavelength, only is such scenario light will reinforce itself. Wavelengths that are not resonant they undergo destructive interference and deflect. One of the two mirrors is fully reflective and the second mirror allows very small amount of light to pass through [4]. Figure.1.a: Fabry Perot Laser conceptual structure, Ref: [4] Figure.1.b: Fabry Perot Laser structure, Ref: www.scholar.lib.vt.edu A.1. Advantages FP laser gives comb of (Amplified Spontaneous Emission) ASE peak uniform in frequency [5]. FP laser can be used for transmission of data with multimode optical fiber [6]. FP laser also have uniform intensity over Erbium Doped Fiber Amplifier (EDFA) [5]. Perfect for optical links where long term power and wavelength stability is required. A.2. Disadvantages High dispersion in high speed and long transmission system because the spectral width can span as much as 5 nm [6]. At 2.5Gbps and higher the wavelength center of FP laser goes out of wavelength tolerance. Not suitable for long distances. With the improvement in VCSELs technology, applications of 1310 nm and 1550 nm applications are moving from FP laser to VCSEL. A.3. Future directions and Applications Increase in bandwidth up to 15 GHz (the running value) by reducing low frequency roll off parasitic effects of bias circuits by injection locking [7]. FP lasers can generate single longitudinal mode laser [8]. FP lasers external optical modulator for optical access network [9]. Spectral width of FP laser allows transmission to distances of 40 Km at 1.7 Gbps.[5] FP offers Corse wavelength division multiplexing (CWDM) with channels at 1.3ÃŽÂ ¼m and 1.5ÃŽÂ ¼m simultaneously on a single fiber [5]. FP lasers offer benefits in LAN that use one wavelength per fiber [6]. FP laser can be used as multi wavelength source of Amplified Spontaneous Emission (ASE) for spectrum sliced [5]. The 1550 nm FP laser can support Synchronous Optical Network (SONET) [6]. A.4. Commercial availability of FP lasers Multiple Application Platform (MAP) FP laser [9] is FP laser source with key features like single mode or multi mode output, internal modulation, LAN extensions for instrumentation (LXI) compliant etc. This device has weight of almost of half kilo gram is capable of operating on different optical fibers such as Flexcorà ¢Ã¢â‚¬Å¾Ã‚ ¢ and SMF-28 [10] with operational temperature range of 10à ¢Ã‚ Ã‚ °C to 40à ¢Ã‚ Ã‚ °C. This product is commercially available. B. Distributed feedback (DFB) lasers In FP laser there is feedback of light from the mirrors, this light feedback can be provided in distributed manner by series of closely spaced mirrors/reflectors (means there is a periodic variation in the width of the cavity). There is a corrugated section in the cavity; the incident light passes through section causes series of reflections. If the corrugation period is the integral multiple of half wavelength (Bragg condition) the resulting transmitted wave will add in phase. This mechanism suppresses other longitudinal modes and allow only single longitudinal mode whose wavelength is equal to twice the corrugation period. [11] Figure.2. DFB laser structure [4] B.1. Advantages DFB lasers provides better wavelength stability than cleaved end face laser [12] The line width of DFB is less than that of reflective end face lasers [12]. Low chirp [13] Better wavelength selectivity. DFB laser is used in high performance system because of its narrow spectral output width [6]. B.2. Disadvantages The amplitude of the standing wave is fixed because of gratings Emitted wavelength near threshold current cant be controlled [14] Wavelength chirp is associated with the spatial burning of the carrier holes. Some values of rare facet phase give unacceptable performance. B.3.Future directions and applications of Distributed feedback (DFB) lasers All optical flip-flop is one of the building block for fast optical packet switching as it temporary stores the header information while the payload is routed to the correct output port. Single distributed feedback (DFB) laser diode based, all optical flip flop can be used to serve this purpose. Experimental results shows that DFB lasers can provide optical memory in an economical way and at the same time shows fast switching of optical packets (as low as 45 ps can be achieved). Using DFB lasers as an all optical flip flop 40 Gbps can be switched. [15] Used in DWDM system where tune ability of signals are required. Used in the sensing of extreme narrow line width of the signal. B.4. Commercial availability of Distributed Feedback laser The production of Quantum dot pure Green laser [16] is possible by using DFB laser technology. DFB laser gives high reliability for optical communication to form quantum dot crystal with a wavelength of 1064nm [16]. There is significant amount of reduction in power consumption for converting 1064nm quantum dot laser from electricity to light by the use of DFB laser. C. Multi Quantum well (MQW) lasers In Quantum well lasers the active region is very narrow which causes quantum confinement to occur. The wavelength which emits is dependent on the width of the active region rather than the band gap. This feature gives shorter wavelength than conventional lasers [17]. Figure.3. Cavity structure of MQW laser [4] C.1. Advantages Enhanced gain due to quantum well structure and gain co-efficient is usually 3 times or more than single layer FP laser [13] Produce shorter oscillation wavelength Smaller linewidth enhancement factor (ÃŽÂ ±), at larger linewidth enhancement factor the laser instability is enhanced [13]. Small optical losses Better confinement of laser actions because of multiple active regions. Low threshold current High modulation speed Low temperature dependency C.2. Disadvantages The internal structure of MQW laser is designed such that it is more susceptible to back reflections. C.3. Future directions and Applications Modulating retro reflector combines optical retro reflector and optical modulator (MQW lasers). Strained quantum well technology can become the core technology for high performance semiconductor device by expanding the flexibility of band engineering [18]. Optical repeaters, as it gives saturated output power to about 3dBm. C.4.Commercial availability of MQW lasers SANYO GaAlAs index guided laser diodes with MQW structure, these are infrared powerful lasers source [19] of maximum power up to 200mW and wavelength range of 782nm to 830nm is commercially available. SONY GaAlAs index guided laser diodes with MQW structure; these are infrared powerful lasers source [19] gives optical power range from 90mW up to 60W. This huge optical output power gives high brightness. D. External Cavity Diode Lasers (ECDL) ECDL can also be used to achieve the single longitudinal mode wavelength. ECDL is a semiconductor based laser with one end of the laser diode has anti reflective coating and laser resonator is completed with collimating mirror and external mirror. As they are tunable lasers so for wavelength selection they use diffraction gratings. End mirror contains collimating lens and diffraction grating. The anti reflective coated end of the diode gets feedback from the diffracted beam. Tuning of the emitted wavelength is done through the rotation of the diffracting grating. There is some more variation for this setup. [11, 20] Figure.4. EDCL setup Ref: www.clu-in.org D.1.Advantages Side mode suppression ratio (SMSR) is better than -40 dB and has narrow intrinsic line width Pulse repetition rate can easily be selected [21] Filter can be inserted for the fixing of emission wavelength in mode locked diode laser [21] etc. D.2. Disadvantages The direction of output beam changes by rotating the diffraction grating which not suitable for many optical communication applications. In fixed direction of the output beam, the zero order reflection of the beam bounced by the mirror is lost. D.3.Future directions and applications Tunable continuous wave THz radiation can be generated by the use of dual mode ECDL from 250 MHz to several THz [22] Without mode hopping wavelength tuning over 40 nm around 1550 nm is expected by new configuration of EDCL with all dielectric thin film Fabry Perot filters. [23] Atomic clock: ECDL is used in the optical system of the atomic clock; it is used for the cooling and the detection of clock transition. [24] Mode locked ECDL are mostly used in optical communication (DWDM) for data transmission. [21] Testing and measurement in optical fiber communication Non-linear frequency conversion. D.4. Commercial availability of ECDL TEC-100 and TEC-120 [25] External cavity diode Littrow laser system gives optical output power up to 200mW and running range (mod-hop free) up to 30GHz. DLX-100 [26] External cavity tunable diode gives output power up to 1W and mod-hop free tuning up to 15GHz. E. Vertical Cavity Surface Emitting Lasers (VCSEL) VCSEL achieves single longitudinal mode operation in different manner. The active region is placed between two highly reflective surfaces/mirrors. These two reflective surfaces have alternated high and low refractive index. The reflectivity of the surfaces is between 99.5-99.9% that is why light oscillates perpendicularly through the layers and emits from the top or the bottom of the device. [27] E.1. Advantages It has high wavelength stability It is less sensitive to temperature (can operate reliably up to 80 à ¢Ã‚ Ã‚ °C) Less refrigeration is required for VCSEL as it operation do not emit much heat. It provides high powered per unit area ( up to 1200W/cm2) It emits circular beam as a transmitter which leads to small optical loss. Figure.5. VCSEL structure [4] E.2. Disadvantages Because of high mirror reflectivity in the VCSEL internal structure lowers the optical output power. They emit low output power (in mW) because of their small active medium volume. InP based VCSEL suffers from having low conduction band offset, low conduction band offset means low confinements of electron which results improper temperature stability of active material gain. To produce longer wavelength in VCSEL, mechanism of double fusion is used. This mechanism increases the cost as it is complicated procedure [28]. E.2. Future directions and applications of Vertical External Cavity Surface-Emitting Laser (VECSEL) [20, 32] There is an issue of optical power supply for Si-photonics transceiver which are being developed for high density optical interconnect on parallel processors can ideally solved by VECSEL as the emits in 1330 nm and 1550 nm. [29] High speed modulation up to 25 Gb/sec can be achieved by using VCSEL at low current of 7.4 KA/cm2. [30] Fast modulation frequency (in GHz) made its use in optical fiber communication as transmitter Ideal for local and metro area networks as they produce low output power. Threshold less laser [31] etcà ¢Ã¢â€š ¬Ã‚ ¦ E.3. Commercial availability of (VCSEL) VCSEL technology has flourished and gives wide range of products with ultra low noise, narrow line width, high optical output power (up to 1kW) and high speed modulation (speed >5GHz) [27]. For high optical output power up to 1KW, a module for cooling of this system is used and fiber is pigtailed for high brightness VCSEL array. VCSELs are commercially available in blue, green and UV lasers [27]. iii. Comparison of semiconductor lasers In this section DFB, ECDL, MQW and VCSEL are compared with respect to different parameters and their suitability as optical transmitter in different optical networks. Parameters Tuning agent Output power ( in dBm) Tuning speed Modulation speed Lasers DFB Temperature 13 Slow (m-sec) Fast (multi-GHz) MQW Quantum confined stark effect ~7 Fast( Fast(multi-GHz) VCSEL MEMs Optically pumped 6 Electrically pumped -3 Fast(ÃŽÂ ¼-sec) Fast ( few GHz) ECDL Peizo transducer ~13 Slow(m-sec) Slow ( Table.1: Comparison of semiconductor lasers Table.1 shows relative analysis of semiconductor lasers. Each semiconductor laser has got competitive advantage with respect to different parameter. Table.2 gives a comprehensive view of the semiconductor lasers and their application in a specific network type as an optical transmitter. Semiconductor Laser Network type FP laser Short to medium range (Local Metro) Networks DFB Laser Long haul network MWQ Laser Short to medium range (Local Metro) Networks ECDL Long haul network VCSEL Short to medium range (Local Metro) Networks Table.2: Semiconductor lasers with their network type support Lasers Max spectral output width FP 5 nm VCSEL 0.5 nm DFB 0.1 nm Table.3: Spectral width comparison of short range lasers Spectral output width measure the range of the wavelengths produce by a laser. From table.3 it is evident that DFB laser has the narrowest spectral output width, which makes DFB laser the best choice for high performance short range optical transmission systems. iv. Conclusion This paper gives a review on the semiconductor lasers, their working, applications, commercial availability and future directions. Relative analysis of these lasers shows that they have competitive advantage in one or other laser parameters and this analysis also shows that which semiconductor laser is appropriate to which type of optical network. Semiconductor lasers have wide applications in optical fiber communication. Lots of exciting research is going on in this field and there is still room of improvements.

Personal Computers vs Console

Personal Computers are much more advanced than any console available on the market today or any other day. In the PC world players reap many more benefits in online and offline gaming. These benefits keep growing in numbers as developers of the consoles continue to argue between themselves about who provides the better support or who offers more games at better quality. Actually, there is no contest as Ed Ricketts of Techradar. com states, †While Xbots and the Sony Defense Force argue among themselves, and Wii-ers throw even more ridiculous shapes pretending to play he tambourine or something, there is another group of gamers who quietly, and happily enjoy the best of the gaming platform yet. The PC†. Ed makes a strong point here. As Sony and Xbox developers argue, we PC gamers continue to offer outside support for games in Beta or even full-release games. Games that are no longer supported by the software developer due to outdated games or recently shut down companies, are still supported by the online gaming community through constant and tedious efforts. This is a showing of the true dedication to improve the experiences for everyone who enjoy PC aming. Personal Computers do not suffer from the hardware restrictions of a console, they can be easily fixed, upgraded, and maintained. Consoles are delicate and difficult to service. If there is hardware failure on a game console it has to be sent to the company for repairs. This can take weeks, or it can be serviced locally for a heavy fee. Although most PC's are used only for simple processes such as; Microsoft Office, a multitude of browsers and e-mail services, they are not restricted to the same limitations as consoles. Consoles can only use software provided by the developers, or require illegal emulators to run out sourced software. The advantages of a PC are not limited by anything but the continuous evolution of technology. When a new technology is released gamers in the PC world are the first to experience it, as companies such as Sony, Xbox(Microsoft), and Nintendo, struggle to keep up with modern technology. Consoles suffer from the inability to upgrade until the release of the next new console, which is still typically outdated technology. When the PS2 and the Xbox first came out their technology was already two years old! Aside from the PC supporting higher resolutions and soon-to-be exponential refresh rates, it can adapt to both newer and older games as it is reverse compatible always! Another statement by Ed Ricketts that is well founded was, †With the aforementioned higher resolutions and textures, chances are a new PC game already looks better than its console counterpart right now. Even if one cannot run a PC with all the visuals tweaked to the max, processor and graphic cards prices drop so quickly that it is hardly ank-breaking to refit a personal computer. â€Å"(2008) Ed has a valid point, we in the PC world can suffer from heavy expenses to upgrade a computer but, as technology is outdated almost every four months the prices drop quickly for new but slightly outdated hardware. These hardware updates will always take the PC beyond the limitations of any console. User interface is a very important aspect of ele ctronics. As such, a lot of time and research has been put into controller and keyboard designs. Computers use the same. QWERTY key layout that was first patented in 1868 (Liebowitz, Margolis 1996). Because of this, the keyboard that you find on your computer has had more than 140 years research and development to find a suitable style for users. This has resulted in an almost universal keyboard design and layout that is virtually identical across the market making it very seamless and almost unnoticeable when you switch from one Keyboard to another, regardless of what the brand on the computer is. On the other hand, the first gaming console introduced to the public was only released in 1978 (Kirby, 1982). Since then many gaming consoles have been developed and released to the public, each with its own take on how a controller should feel in the hand. With this, every console on the market with the exception of PlayStation 1, 2, and 3, have completely different controller design which makes switching from one console to another sometimes tedious. With time all consoles developed will eventually conform to a single design. There is no doubt to be a single interface device for all console games but until that time if one eeks the comfort of familiarity, the keyboard is a reliable source. As one looks back on the times and the changes that the country has endured, in regards to electronics, there has to be some thanks given to those who have made society’s lives easier. Obviously, life is simplified by the advances that have been made to PC’s and gaming consoles. Look back at the times and appreciate what the â€Å"nerds† have given to the world. Life will never be th e same and it will be forever advancing. PC VS. console gaming is by far a different world. Be it PC or console, there is lways going to be people who prefer one over the other. References Ricketts, E. (2008). TechRadar. Retrieved from http://www. techradar. com/news/gaming/12-reasons-pc-gaming-is-better- Liebowitz, S. , & Margolis, S. E. (1996). Typing errors. Reason, 28(2), 28. Retrieved from EBSCOhost. Kirby C. Odyssey? (North America Philips — Magnavox): The Lost Opportunity. Black Book – Video Game Industry (December 1982) [e-book]. Bernstein Global Wealth Management; 1982:57-58. Available from: Business Source Complete, Ipswich, MA. Accessed April 7, 2011.

Choosing Top Ten Persuasive Essay Topics Is Simple

Choosing Top Ten Persuasive Essay Topics Is Simple Students ought to be permitted to pray in school. They need more practical subjects to learn how to use different things. They should keep their mobile in silence so as to not disturb the class. They are supposed to write persuasive speech as part of their assignments. Well, first, you are going to want to find good persuasive speech topics. Thus, a speech should be organized. You've been requested to provide a persuasive speech. If you still don't understand how to prepare an intriguing speech, EssayShark can assist you. In order to reach terrific benefits, you should learn to persuade. The ideas you'll find here will surely inspire you and provide you some new ideas. You will be happy to know that it has best deals like gift vouchers etc. and should you shop above thousand then you'll get totally free delivery too. If you do have to go over a number of topics, it's much better to compose individual emails for every one of them. Finding the Best Top Ten Persuasive Essay Topics Possessing the most effective informative speech essay ideas isn't enough. There are several factors you should concentrate on when choosing a persuasive speech topic. A persuasive essay is a powerful tool when you will need to supply a new vision of a specific to pic for the reader. All persuasive essays are like argumentative essays. For one to have the ability to earn an amazing persuasive speech, an individual must pick a topic that the listeners can relate to. It's great whenever you are interested in what it is that you are telling about the audience. It's also wise to attempt to comprehend your audience's dominant perspective. To begin with, you have to be aware of your intended audience very well. Appropriate writing and presentation is the secret to success. Whenever your speech is written properly, you are aware that you'll have the ability to convince your audience by means of your viewpoint. You do not need to be formal when writing your thoughts. When choosing persuasive speech topics, you also need to take into consideration where you could be comfortable. How to Get Started with Top Ten Persuasive Essay Topics? Sure, with this kind of a substantial selection of topics to pick from, picking just one may be challenging. Use what you read to assist you create some search terms, and to assist you choose your own position. It's hard picking a topic for your speech because there are many choices so look at these factors when deciding. Spending time to select the most suitable topic will help you submit a great assignment. You should be aware of whether they know anything about this issue, which side they are on and so forth. In precisely the same time, you can get a popular topic, but just in an instance, you've got something new and important to say. There are many intriguing topics that could be become a persuasive essay if you take the opportunity to consider about doing it. Naturally, giving a fantastic persuasive speech requires more than simply selecting a very good topic. Each time you wish to make sure your persuasive speech success, you ought to go far past the topic and words you have prepared. It's best in the event you choose a topic in which you get a genuine interest in as you'll be doing plenty of research on it and if it's something which you take pleasure in the procedure will be significantly easier and more enjoyable. You ought to know that all stages of speech preparation are important, and not just just choosing the ideal topic.

Gender Differences On Negative Emotions During The...

Not knowing where these biases have come from, but it has been instilled in human beings at a young age that females show gentle emotions, and males show more aggressive emotions. â€Å"Sayings such as ‘boys don’t cry’ and ‘sugar and spice and everything nice—that’s what little girls are made of’ reflect cultural beliefs and expectations that girls show cheeriness or sadness, whereas boys are strong and calm, showing anger if necessary† (Chaplin Aldao, 2013). Before this study, there were only empirical reviews of happiness expression. There has been no empirical review of gender differences on negative emotions during the childhood and adolescence stages. â€Å"Learning is a key feature of healthy social emotional development† (Chaplin Aldao, 2013). As stated in the article, an infant communicates through a series of emotions when it needs something, like when the child is hungry or when the child needs its diaper changed, or when the child just wants attention in general. The child â€Å"develops flexible patterns of facial, vocal, and behavioral expressions of emotions that allow them to communicate their feelings†¦Ã¢â‚¬  (Chaplin Aldao, 2013). Social relationships are developed by children’s emotional expressions. If children are not able to express themselves or are limited to emotion expression, it is a higher risk that the child may develop a compromised socioemotional functioning and a risk for developing psychopathology. â€Å"†¦Boys are more likely to have conduct problems such asShow MoreRelatedA Research Study On Social Anxiety1462 Words   |  6 Pagesplayed by environmental aspects. On the other hand, cognitive process modify the thoughts of an individual during the course of development (Albano Kendall, 2002). This research highlights that in early adolescence thinking abilities are developed adequately for individuals to recognise and develop their own cognitive worlds (Albano Kendall, 2002). 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