Analysis of the thz power scalability indicates that due to the. Elec 6871 fiberoptic communications systems and networks page 2 project report. Thulium doped fiber amplifier tdfa for sband wdm systems fady i. The anisotropic ytterbium doped tapered double clad amplifier with 50. The most common example is the erbium doped fiber amplifier edfa, where the core of a silica fiber is doped with trivalent erbium ions and can be efficiently pumped with a laser at or near a wavelength of 980 nm or 1480 nm, and exhibits gain in the 1550 nm region. Rp photonics encyclopedia tutorial fiber amplifiers, part. Rare earth amplifiers become a major component as an active device in fiber optic communication systems because of there is no requirement of electrooptical conversion during the amplification process. By adjusting the powers and orientation of input pump modes, modal dependent gain can be tuned over a large dynamic range. A passively modelocked fiber laser is then built up. Pdf thulium doped fiber amplifier tdfa for sband wdm systems.
Demand on higher bandwidth bring about to use the other rare earth doped fiber such as thulium doped fiber amplifiers tdfas. The ytterbium doped fiber amplifier offers a number of attractive features, including a broadgain bandwidth and a high efficiency, due in large part to its freedom from various competing. Elnahal department of electrical engineering islamic university of gaza gaza, gaza strip, palestine. In the present paper, the erbiumytterbium codoped fiber amplifier eydfa has been irradiated by a neutron beam of different doses for various exposure times from an am241be9 neutron source. Edfa erbium doped fiber amplifier tutorial exfiber optical technologies co. A modern wideband and flat gain erbiumdoped fiber amplifier edfa is suggested and accomplished, by employing a recently fabricated hafniabismutherbium doped fiber hbedf and zirconiaerbium doped fiber zredf as a hybrid active fiber. Rp photonics encyclopedia tutorial fiber amplifiers. Implementation of three functional devices using erbium. Implementation of three functional devices using erbiumdoped fibers. An efficient wideband hafniabismuth erbium codoped fiber. Introduction erbiumdoped fiber amplifiers are the by far most important fiber amplifiers in the context of longrange optical fiber communications. Pdf erbiumdoped fiber amplifier edfa is an optical amplifier used in the cband and lband, where the loss of telecom optical fibers. Thulium doped fiber amplifier tdfa for sband wdm systems conference paper pdf available in open journal of applied sciences 204 october 2012 with 1,321 reads how we measure reads. Learn about rare earth ions, gain and pump absorption, steady state, ase, forward and backward pumping, doubleclad fibers, pulse amplification, amplifier noise and multistage amplifiers.
Islam is the member of institute of electrical and electronic engineers ieee and the fellow of institute of engineers bangladesh ieb. There are 3 groups of energy levels denoted by u, m and g representing the upper, metastable and ground states respectively. Numerical modeling of the thermally induced core laser leakage in high power copumped ytterbium doped fiber amplifier volume 6 lingchao kong, jinyong leng, pu zhou, zongfu jiang. Unlike other cladding pump or dualclad fibers, fibercores dualclad erbiumytterbium doped fiber fcp1500y was originally designed as a highpower communications amplifier fiber. Ultralarge mode area single frequency anisotropic mopa. A more complete description can be found in the references. The ytterbiumdoped fiber amplifier offers a number of attractive features, including a broadgain bandwidth and a high efficiency, due in large part to its freedom from various competing processes seen in other rareearth dopants. An amplifier utilizing the fiber demonstrated that the proposed fiber yielded 6 db higher sbs threshold than a fiber without using the codoping scheme. In particular, the erbiumdoped fiber amplifier edfa is one.
W average power is generated using 10 w from a parabolic fiber amplifier. Modeling and experiments of the gain and noise figure for an. Design project of elec466elec6871 erbium doped fiber amplifier design project description 1. Numerical modeling of the thermally induced core laser. Introduction to optical amplifiers 417 a raman amplifier is distributed over a long span of optical fiber. It is used in the telecommunications field and in various types of research fields. Erbium doped fiber amplifier and erbium doped fiber laser. Laser driver for high power erbium doped fiber amplifier edfa 6 p a g e the energy level diagram of erbium doped region of the core is as shown in figure 2. Pyfiberamp is a rate equation simulation library for rareearthdoped fiber amplifiers and fiber lasers partly based on the giles model.
Fundamental design of a distributed erbiumdoped fiber amplifier for long distance transmission. We report a claddingpumped broadband lband amplifier based on a phosphosilicate erbium ytterbium doped fiber. Reliable information about the coronavirus covid19 is available from the world health organization current situation, international travel. It provides customers with the capability to extend their 100ghz, up to 40 channels, 2. Various types of optical amplifiers have been developed in ofcs to amplify optical signals. Regenerative erdoped fiber amplifier system for high. An erbiumdoped waveguide amplifier or edwa is a type of an optical amplifier. This paper was published in optics express and is made available.
The pump power and thuliumdoped fiber tdf length for singlepass thuliumdoped fiber amplifiers tdfa are theoretically optimized to achieve the optimum gain and noise figure nf at the center of sband region. High gain efficiency amplifier based on an erbium doped aluminosilicate holey fiber. Information from its description page there is shown below. A signal pulse train with a wavelength tuning range of 18 nm is produced by a passive modelocked fiber laser based on a nonlinear polarization rotation technique. Our line of benchtop optical amplifiers includes ytterbium doped fiber amplifiers ydfas, a praseodymium doped fluoride fiber amplifier pdfa, and erbium doped fiber amplifiers edfas. Abstractwe present experimental results of distributed 1550 nm gain measurements from a dualpumped 1050 nm thuliumdoped fiber amplifier using optical frequencydomain reflectometry. A regenerative erdoped fiber amplifier system for a highrepetitionrate optical pulse train is investigated for the first time. Gain, noise figure and forward ase spectrum of a forwardpumped erbium doped fiber amplifier. A powerscalable approach for thz generation is demonstrated using optical rectification in gap pumped by a high power ultrafast ybdoped fiber amplifier operating at 1.
The pdfa incorporates a relatively short length of. Author of hps fiber optics handbook, he has been active in the development of fiber optics instrumentation technology, measurement standardization and applications since l982. The dwdm edfa is a lownoise, gainflattened cband optical erbium doped fiber amplifier edfa designed to extend the distance in dense wavelengthdivision multiplexing dwdm optical infrastructure. Rare earth doped fiber amplifiers are finding increasing importance in optical communications systems. Fundamental design of a distributed erbiumdoped fiber amplifier for. The first stage preamplifier is an erbium doped fiber amplifier edfa based on heavily erbiumdoped fiber liekki er80 pumped bidirectionally by two 700mw, 980nm singlemode pumps. We show that significant reductions in total pump power andor fiber length are realized with the addition of a few milliwatts at 1550 nm. Lab 1 characterization of erbium doped fiber amplifiers 1. Read gain variations for an erbium doped fiber amplifier in a temperaturerange from 45 k to 320 k, journal of optical communications on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Read properties of laser and amplified signal in a gain.
Semiconductor optical amplifiers small package potential use for lowcost applications potential use for optical switching opti 500 c, spring 2011, lecture 23, introduction to optical amplifiers 1 types of optical amplifiers. Np photonics cband ase source is a low cost, high performance ase. In the present paper, the erbiumytterbium co doped fiber amplifier eydfa has been irradiated by a neutron beam of different doses for various exposure times from an am241be9 neutron source. Pdf thulium doped fiber amplifier tdfa for sband wdm. Pdfa is defined as praseodymium doped fiber amplifier somewhat frequently. This fiber amplifier has operated for 2 months without any degradation or observed optical damage. The amplifier gains as a function of fiber length with a fiber of radius 1. We demonstrates allfiber master oscillator power amplifier delivered 70w output power at 1033. Osa power scalable compact thz system based on an ultrafast. At least the loss limitation can be partially canceled out by the introduction of optical. Typically, the optical pump is introduced at the end of a length of fiber in order to provide optical gain that increases towards the end of the fiber. Available formats pdf please select a format to send.
The edfa amplification region varies from application to application and can be. Performance impacts due to excitation of undesired pump modes, mode coupling and macrobending loss within the erbium doped. Design considerations and system performances tutorial singlestage eryb amplifier using singlemode eydf xp products to reach a few watts of output power, the amplifier must be designed with an eryb fiber optimized for high extractable gain and high efficiencies. The design of erbiumdoped fiber amplifiers ieee xplore. Introduction erbiumdoped fiber amplifiers are the by far most important fiber amplifiers in the context of. Principles and applications, an important exploration of the theninfant technology of erbium doped fiber amplifiers, and erbium doped fiber amplifiers. Optoelectronic components for a 100w erbiumdoped fiber.
Erdoped fiber lasers edfls can be viewed as edfas operating in the particular regime where coherent oscillation of ase occurs due to some feedback means. However, for practical optical fiber communication systems, the. Doped fiber amplifier and fiber laser file exchange. Pdfa praseodymium doped fiber amplifier acronymfinder. Oclcs webjunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus. Customized sdh erbiumdoped fiber amplifier datasheet fs. This high power source produces a broadband output spectrum of. In this work we present a novel design of an optical amplifier with high gain elaborated. For single mode propagation, v erbium doped fiber amplifier tutorial exfiber optical technologies co. Aug 05, 2002 this twovolume set combines erbium doped fiber amplifiers. A laser efficiency of 20 % is obtained with an output power of about 8 w for 40 w pumping power. Eryb doubleclad dc fibers are used in laser or amplifier systems for power scaling andor singlefrequency applications.
May 26, 2015 the first implementation of active fiber optic amplifier was demonstrated in 1994 with erbium doped fiber amplifier edfa. Edfls are used as sources for coherent light signal generation, while edfas are used as wavewave amplifiers for coherent light signal regeneration. The term doping refers to the process of using chemical elements to facilitate results. Osa multimode fiber amplifier with tunable modal gain using. The simple example below demonstrates a corepumped ybdoped fiber amplifier. It is crucial to study the effect of radiation on the fiber amplifier devices. How is praseodymium doped fiber amplifier abbreviated. Rare earth doped fiber amplifiers erbium edfa 1500 nm, praseodymium.
Pulsed dualstage fiber mopa source operating at 1550 nm. In the latter case, wallplug efficiencies, excluding cooling of the pump diode lasers, in excess of 15% were also achieved. Thulium doped fiber amplifier tdfa for sband wdm systems. Pdf erbiumdoped fiber amplifier edfa is an optical amplifier used in the c band and lband, where the loss of telecom optical fibers. Thorlabs optical amplifiers are available as complete benchtop systems or as pigtailed butterfly packages. A large signal input power is considered in this case, since high signal input helps to produce high output power, which is necessary to boosterpower amplifiers. High gain efficiency amplifier based on an erbium doped. Tmdoped fiber amplifier with supercontinuum output. At er doped fiber laser pumping, the maximum peak power of the gainswitched seed pulse is 227. The edfa amplification is achieved by the stimulated emission of the input signal photons. Device and system developments, a new volume designed to expands the reader s conceptual understanding of edfas and cover the. Sep 14, 2016 we build a tm doped fiber amplifier based on a gainswitched seed laser. It can be seen that the optimal length for a maximum gain of 19 db is calculated to be z f 8 cm with pump power 50 mw, about two orders shorter of magnitude than the rareearthdoped silica fiber amplifiers. Theory on the timedynamic simulations is not yet included.
Unfortunately or fortunately, we have discovered that at the lasing time there is no amplification or the signal travels the erbium doped fiber core without any amplification or absorption. Customized sdh erbiumdoped fiber amplifier parameters symb min typ max operating wavelength nm. The most common example is the erbium doped fiber amplifier edfa, where the. Doped fiber amplifiers dfas are optical amplifiers that use a doped optical fiber as a gain medium to amplify an optical signal. A new erbiumdoped fibre amplifier edfa is demonstrated using a combination of newly developed erbium zirconia codoped fiber zredf and the commercial silicabased erbiumdoped fiber siedf as the gain medium. In this paper, new configuration is proposed, investigated and analyzed. Fiber laser and fiber amplifier are merged in one configuration which called erbium doped fiber laser and amplifier edfla or integrating edfl and edfa in one design. In an earlier work, a bismuthbased erbium doped fiber amplifier biedfa with a wideband operation was proposed using a dual series stage in conjunction with a doublepass configuration.
Fewnanosecond pulses propagating in an ybdoped fiber amplifier are distorted because of gain saturation. In this paper we investigate the properties of a 10 w doubleclad er. Nddoped fiber lasers and fiber amplifiers at 9xx nm by. The gaussian pulse with its exponential leading edge retains its shape better than the square or sawtooth pulses. It is first studied an allfibered continuous laser. Tutorial selecting the optimal eryb doped optical fiber. Statement by author the thesis titled nddoped fiber lasers and fiber amplifiers at 9xx nm prepared by. Elec 6871 fiber optic communications systems and networks page 2 project report. The development of erbiumdoped fiber amplifier edfa. Modeling and experiments of the gain and noise figure for. Perhaps the most important version is erbium doped fiber amplifiers edfas due to their ability to amplify signals at the low loss 1. To our knowledge, we report the first fourier domain modelocked laser fdml constructed using optical parameter amplifier opa in conjunction with an erbiumdoped fiber amplifier edfa, centered at.
Alge codoped large mode area fiber with high sbs threshold. A gain of more than 10db has been achieved from 1553 to 1610nm in a 5m long fiber in a doublepass amplifier configuration. When the pulse is turned off, damped oscillations are observed too with the same. The scienti c interest in ber lasers stems from the rich nonlinear. The signal to be amplified and a pump laser are multiplexed into the doped fiber, and the signal is amplified through interaction with the doping ions. The ytterbiumdoped fiber amplifier offers a number of attractive features, including a broadgain bandwidth and a high efficiency, due in large part to its freedom from various competing. As an example, we consider an erbium doped fiber amplifier, as it could be used in optical fiber communications, e. Wideband and flat gain series erbium doped fiber amplifier.
Pdfa stands for praseodymium doped fiber amplifier. A 120mhzrepetitionrate pulse train of singlecycle thz radiation with 6. It is a close relative of an edfa, erbiumdoped fiber amplifier, and in fact edwas basic operating principles are identical to those of the edfa. Helmy department of electrical and computer engineering, university of toronto, 10 kings college road, toronto, on m5s 3g4, canada. Laser diode module, dpss laser, fiber coupled laser for sale. In this thesis two subprojects associated with ytterbium doped fibers are discussed. The pump light is guided within an allsilica structure, using a fluorinated secondary cladding to create the pump guide boundary, without the need for low index. Please see the pdf emission tab for more information on light emission in pr doped fluoride fibers pdf. Both of them can be used to amplify infrared light at wavelengths in optical communication bands between 1500 and 1600 nm. Gain variations for an erbium doped fiber amplifier in a. The gain and noise figure of the eydfa have been calculated theoretically and recorded after and before the irradiation. Supercontinuum generation is observed when this amplified pulsed laser source is injected.
An erbiumdoped fiber amplifier edfa is a device that amplifies an optical fiber signal. A comprehensive physicsbased tutorial on fiber amplifiers. We propose a novel approach of making large effective area laser fiber with higher threshold for the stimulated. Doped optical fiber amplifiers pt2 archives optiwave. Claddingpumped lband phosphosilicate erbiumytterbium co. Characterization of erbium doped fiber amplifiers project. In this way, a raman amplifier can be combinedfa booster or inlineed with a n. Fundamental design of a distributed erbiumdoped fiber amplifier for longdistance transmission. Oct 21, 2016 ytterbium doped optical amplifiers have become common tools for industrial applications due to their high efficiency, relatively low cost and potentially very high output power level. Bambha prepared by sandia national laboratories albuquerque, new mexico 87185 and livermore, california 94550 sandia national laboratories is a multiprogram laboratory managed and operated by sandia corporation.
In the amplifier, peak power of the amplified pulse reaches 1. High gain erbiumdoped fiber amplifier for the investigation of. Numerical simulations have been used to model highrepetition rate ultrafast ytterbiumdoped fiber amplifier systems assuming continuouswave input signals under variable situations, such as. Numerous and frequentlyupdated resource results are available from this search. Flatgain wideband erbium doped fiber amplifier by combining two difference doped fibers. This amplifier utilized two pieces of bismuth erbium doped fiber biedf with a total length of 264 cm. A small signal input power is considered in this case, where results with high gain and small noise figure values are desirable. Simple continuouswave, gainswitched and qswitched fiber lasers. Please see the pdf emission tab for more information on light emission in prdoped fluoride fibers pdf. We propose a method for controlling modal gain in a multimode erbium doped fiber amplifier mmedfa by tuning the mode content of a multimode pump. Jiawei song has been submitted in partial fulfillment of requirements for a masters degree at the university of arizona and is deposited in the university library to be made available to borrowers under rules of the library. Ofs bends the rules of optical fiber by offering a complete portfolio of bendoptimized technologies that meet the most demanding requirements of communications, fibertothehome ftth, cable television, medicine, industry and other applications. Several types of optical amplifiers have since been demonstrated to replace the.
1072 840 1493 1179 1422 652 948 565 673 886 405 840 1327 1290 1221 701 1372 1580 877 632 1163 1224 986 1390 171 676 428 303 174 39 195 1327 166 294 769 803 1417 1428