Doped fiber amplifiers dfas are optical amplifiers that use a doped optical fiber as a gain medium to amplify an optical signal. Introduction to optical amplifier types and applications e. Optical amplification of ofc signal nitttr chandigarh. Pump band is narrow, so the pumping laser has to be. Some for high power booster some for midrange power some for preamplification some for processing on chip to compensate for loss some for optical signal processing in photonic circuit for optical. A background noise mechanism common to all types of erbiumdoped fiber. Modulation multiplexer phase signal analog communication. Edfa, semiconductor optical amplifier soa and fiber raman amplifier. Semiconductor optical amplifiers booster optical amplifiers are amplifiers which use a semiconductor to provide the gain medium. Special types such as regenerative amplifiers and chirpedpulse amplifiers are used to. Raman amplifier types there are basically two types of raman amplifiers as given here. These systems eliminate the need for eo and oe conversions.
As we know, there are several types of optical amplifiers. Types of amplifiers and their circuits with working. A raman optical amplifier is little more that a highpower pump laser, and a wdm or directional coupler. Soa and the fibertype amplifier erbiumdoped edfa or praseodymiumdoped. At least the loss limitation can be partially canceled out by the introduction of optical. An amplifier, electronic amplifier or informally amp is an electronic device that can increase the power of a signal a timevarying voltage or current.
Optical amplifiers an important element of wdm systems xavier fernando adroit group ryerson university nortel optera system optical amplifiers conventional repeaters in nwdm systems are very inefficient. The different amplifiers, such as erbium doped fiber amplifiers edfa, raman amplifiers ra, semiconductor optical amplifier soa, ytterbium doped fiber amplifier ydfa, erbium ytterbium codoped fiber amplifier eycdfa and thulium doped fiber amplifier. The second value is for units with the osc z determines if the unit supports integrated optical. An amplifier that conducts during the full cycle, or has a conducting angle of 360 degrees is known as a class a power amplifier. Connection types digital audio connections name plug jackport descriptionuses optical aka toslink a digital, fiberoptic connection used to send digital audio signals from a source. Fang department of electrical and computer engineering, university of california santa. Optical amplifiers venkat venkataramanan instute for opcal sciences university of toronto. Among them, the main amplifier technologies are doped fiber amplifier eg. Optical amplifiers for intermediate line amplifier ila elimination the first db value for maximum span optical budget represents budget for units without the osc. Finisar optical amplifiers selection guide finisar offers a wide selection of optical amplifiers, ranging in optical and electrical specification parameters, and in a variety of form factors and communications interfaces.
The most commonly used optical amplifiers are the erbium doped fiber amplifier. Different oa types serve different operational needs. Part 1 of this faq began an overview into the arcane world of all optical amplifiers including where and why they are needed. Optical signal out several types of optical amplifiers have since been demonstrated to replace the oe electronic regeneration systems. Amplifier classes and the classification of amplifiers. Integrated optical amplifiers on silicon waveguides.
Semiconductor optical amplifiers soas, as the name suggests, are used to amplify optical. Many of the advances in optical networks have been made possible by the advent of the optical amplifier. Fiber optical communication lecture 10, slide 4 amplifier types doped fiber amplifiers use excitation of ions in the host fiber the erbiumdoped fiber amplifier edfa is most common optically pumped by laser light at higher energy shorter wavelength raman and brillouin amplifiers use nonlinear processes to transfer. Types of optical amplifiers, raman amplifier vs edfa. Fiber optical communication lecture 10, slide 4 amplifier types doped fiber amplifiers use excitation of ions in the host fiber the erbiumdoped fiber amplifier edfa is most common optically pumped by laser light at higher energy shorter wavelength raman and brillouin amplifiers. The optical amplification occurs in the transmission fiber itself, distributed along the transmission path. Simplified schematic illustrations of two types of laser amplifiers pump current active region ar antireflection coating ar signal in signal out a traveling wave amplifier a fabryperot amplifier. Rp photonics encyclopedia optical amplifiers, optical.
Pump power fiber laser semiconductor optical amplifier fiber amplifier optical amplifier. Now, the different types of power amplifiers are described below. Semiconductor optical amplifier is one type of optical amplifier which uses a semiconductor to provide the gain medium. Optical amplifiers for intermediate line amplifier ila. There are three important types of optical amplifiers. This selection guide seeks to help endusers to identify the amplifier. Part 2 will briefly describe the four types and identify the two most commonly used for optical. Optical amplifiers venkat venkataramanan instute for opcal. Rare earth doped fiber amplifiers are of two types edfa erbium doped. New pumping methods and materials are also improving the performance of raman amplifiers.
Integrated optical amplifiers on silicon waveguides john e. Fiber optical communication lecture 6, slide 7 amplifier types doped fiber amplifiers use excitation of ions in the host fiber the erbiumdoped fiber amplifier edfa is most common optically pumped by laser light at higher energy shorter wavelength raman and brillouin amplifiers. Bowers, hyundai park, yinghao kuo, and alexander w. Our line of benchtop optical amplifiers includes ytterbiumdoped fiber amplifiers ydfas, a praseodymiumdoped fluoride fiber amplifier pdfa, and erbiumdoped fiber amplifiers. Handbook of operational amplifier applications rev. The different amplifiers, such as erbium doped fiber amplifiers edfa, raman amplifiers ra, semiconductor optical amplifier soa, ytterbium doped fiber amplifier ydfa, erbium ytterbium codoped fiber amplifier eycdfa and thulium doped fiber amplifier tdfa have different properties that make them suitable for a variety of applications and. They have a similar structure to fabryperot laser diodes but with antireflection design elements at. Distributed raman amplifier dra uses the transmission fiber itself as the medium, into which a backward pump is injected. For example, an amplifier based on bulk laser crystal can amplify multimode beams and can also handle beams with different angular positions and directions in certain ranges, which makes it possible to construct a multipass amplifier see above other optical amplifiers. Optical fiber transmission has revolutionized networking and communication systems. The most commonly constructed amplifier classes are those that are used as audio amplifiers, mainly class a, b, ab and c and to keep things simple, it is these types of amplifier classes we will look at here in more detail.
Performance of various types of amplifiers in dwdm. Introduction of optical amplifier tutorials of fiber. Multiple communication devices, like optical transmitters and receivers, are used in optical. Basic concepts most optical amplifiers use stimulated emission an optical amplifier is basically a laser without feedback optical gain is realized when the amplifier is pumped optically or electrically to achieve population inversion gain depends on wavelength, internal light intensity and amplifier medium three types. There are three most important types of optical amplifiers. Optical amplifiers thorlabs optical amplifiers are available as complete benchtop systems or as pigtailed butterfly packages. An optical amplifier is a device that amplifies an optical signal directly, without the need to first. Chapter 7 lasers after having derived the quantum mechanically correct suszeptibility for an inverted atomic system that can provide gain, we can use the twolevel model to study the laser and its dynamics.
They have a similar structure to fabryperot laser diodes but with anti. Small package potential use for lowcost applications potential use for optical switching. Handbook of operational amplifier applications bruce carter and thomas r. It is the simplest and most common type of power amplifier. Rare earth doped fiber amplifiers erbium edfa 1500 nm, praseodymium pdfa 0 nm the most practical optical amplifiers to date include the soa and edfa types. Wavelength demultiplexing oe conversion electrical amplification retiming pulse shaping eo conversion wavelength multiplexing optical amplifiers. Optical signals are amplified up to 10 db in the network optical fiber. Optical fibre, cables and systems i foreword malcolm johnson director itu telecommunication standardization sector as we approach the half century mark for the dawn of the era of optical. Erbium doped fiber amplifiers edfas best performance wide spread use. Boosting of an optical signal without any conversion of. An optical fiber amplifier is a fiber optic device used to amplify optical signals directly without conversion into electrical signals. There are three most commonly used types of optical amplifiers, as shown from left to right.
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