Digital library video clips, presentation files, etc. The fundamental principle of this new technology is the production of an amplifying medium through optical pumping. Coaxial dualcore resonant leaky fibre for optical amplifiers. In this study we first compare laser induced damage thresholds lidts of different ytterbium doped core concentrations used in high peak power fiber amplifiers. Er doped fiber pin diode tap coupler wdm 980 1550nm pin diode pump source optical isolator tap coupler er doped fiber pin diode wdm 980 1550nm pump source erbium doped fiber amplifier base design optional design example the adva edfa erbium doped fiber amplifier products extend the transmission distance between equipment. Rp photonics encyclopedia fiber amplifiers, edfa, ydfa. An erbium doped amplifier can amplify light wavelength ranging from app 1500 nm to more than 1600 nm. Ase noise characterization of an allfiber sagnac interferometer. We report and characterize an amplifier which provides gain to a record six spatial modes simultaneously. Exp 14 erbium doped fibre amplifier edfa seite 4 dr. A laser efficiency of 20 % is obtained with an output power of about 8 w for 40 w pumping power. The core of the fiber is doped with erbium and is typically pumped with 980 or 1480 nm to produce gain around 1550 nm cband or 1590 nm lband. Implementation of three functional devices using erbiumdoped fibers.
The system used in the simulation is shown in figure 1. We demonstrate amplification over a 240 nm wide window in the range 1810 2050 nm with up to 36 db gain and noise figure as low as 4. The complete amplifier package including the edf is of a fairly standard 2 see. Erbium doped fiber amplifier edfa is an optical amplifier used in the cband and lband, where the loss of telecom optical fibers becomes lowest in the entire optical telecommunication. Its core is the erbiumdoped optical fiber, which is typically a singlemode fiber. One of the most important factors limiting the transmission. Combining the contributions from four international experts in edfas, this new volume expands the readers conceptual understanding of edfas and covers the developmental issues of edfas that are relevant to modern telecom applications. Written by three bell labs pioneers, the book stresses the importance of the interrelation of materials properties, optical properties, and systems aspects of optical fiber amplifiers. The msedfa has achieved low polarization dependent gain, large signal gain and small signal gain of 0. Optical amplifiers, edfa, erbium doped fiber, gain, noise figure 1. Purpose of the experiment understand the principle of operation of the erbiumdoped fiber amplifier edfa. The perfect and stable circuit of optic power output andcontrolling circuit of thermoelectric refrigeration deviceof laser module assure the user the best quality and stable working for a long time.
The ytterbium threelevel system is compared with fourlevel systems that were studied previously. At least the loss limitation can be partially canceled out by the introduction of optical. In a preliminary experiment we achieved 14 db gain and 60 mw of amplified signal. Rayleigh backscattering and amplified spontaneous emission in. Stability of a 500 km erbiumdoped fiber amplifier cascade dtu orbit. Sensor, erbiumdoped fibre amplifier, fibre bragg grating. 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. A model for the erbium doped fibre amplifier edfa is presented and discussed. Cdata 1550nm erbiumdoped fiber amplifier hf3003815 series adopts imported optical module, pump laser and erbium doped amplifier. 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.
They are a series of high gain, low noise amplifiers for transmission, inline and preamplification applications operating in the. Fiber lasers, pm amplifiers rightwave highly doped erbium edf, ytterbium and thulium doped edf. Erbium fiber amplifiers is a comprehensive introduction to the increasingly important topic of optical amplification. Device and system developments brings telecommunications professionals up to date. The amplifier is based on erbium doped fiber, and can be incorporated directly into an optical network, avoiding the need to convert optical signals to electrical signals for amplification and relaunch. Implementation of three functional devices using erbium. This amplifier provides a peak gain of 25 db at 2040 nm with a 15 db gain window spanning. A comparison of results for signals at wavelengths 1532 and 1552 nm is given. This fiber amplifier has operated for 2 months without any degradation or observed optical damage. It is first studied an allfibered continuous laser. The model is used in a detailed analysis of the waveguide design of 980nm pumped edfas operated in the smallsignal gain region. Experiment on erbiumdoped fiber amplifiers li qian advanced labs for special topics in photonics ece 1640h university of toronto april 28,1998 1. The influence of the amplified spontaneous emission on the optimum. Thorlabs offers two lines of erbiumdoped active optical fibers.
Design and development of erbium doped fiber amplifiers. Towards more efficient praseodymium doped fibre amplifiers for. Towards more efficient praseodymium doped fibre amplifiers. It is used in the telecommunications field and in various types of research fields. Optical amplification technologies for space division multiplexing. A first stage fiber amplifier is seeded with a commercial microlaser producing sub.
Thorlabs offers stateoftheart ytterbiumdoped optical fibers for optical amplifiers, ase light sources, and highpower pulsed and cw fiber laser applications operating with powers in the milliwatt to 100 w range and emitting in the 1100 nm wavelength region. It has not been generally appreciated that the erbium doped fibre amplifier edfa has both a saturation output. Doped fiber amplifiers dfas are optical amplifiers that use a doped optical fiber as a gain medium to amplify an optical signal. The main difficulty with the thulium doped fiber amplifier is that the amplification is generally limited because the lifetime o f the 3 h 4 level 1. Smallsignal erbiumdoped fibre amplifiers pumped at 980 nm. Pdf fibre amplifier based on an ytterbiumdoped active. The progressive transition towards high capacity, alloptical networks has increased the. Characterization of a highpower erbiumdoped fiber laser. The combination of a highly doped core, a large coretocladding ratio, and an efficient octagonal cladding.
All discbased content for this title is now available on the web. These are just a handful of the essential questions answered in erbiumdoped fiber amplifiers. Ytterbium doped fibre amplifiers ytterbium doped fibre amplifiers 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 processes seen in other rareearth dopants. It is also possible to amplify ultrashort pulses in the 1. Edfa stands for erbiumdoped fiber amplifiers, which is an optical amplifier that uses a doped optical fiber as a gain medium to amplify an optical signal. Due to the small transition cross sections, the saturation energy is fairly high, e. Erbiumdoped fiber amplifiers is exarnined, and furthermore an account of the measurements of. First of all, the gain spectra are analyzed for the pump wavelength at 910 nm and with different input pump powers. The transport of information through electrical conductors results from a temporal change in a flow of electrons. The field of rareearth doped fibre lasers and amplifiers has expanded rapidly in recent years and there are now several groups working actively in the area. The optical amplifier has replaced the rather involved process of the fiber optic repeater station. Erbium doped fiber amplifier edfa used in wdm system. Na afloop van deze plechtigheid zal er een receptie plaatsvinden waarvoor u ook van harte wordt uitgenodigd.
Multistages or booster ytterbium doped fiber amplifier, keopsys ensure long life duration and high reliability of the devices, from the laboratory to onboard applications. We have demonstrated a power amplifier for a singlefrequency signal at 1083 nm as required in spectroscopic applications. Fiber lasers, pm amplifiers edf50 pm 27281 a pm fiber with absorption of 50 dbm at 1530 nm. Signal source and receiver unit which is used to provide input signal power to the amplifier and to measure the output power. Low noisefigure miniature erbiumdoped fibre amplifier. The topics addressed include quenching processes and the solubility of rareearth ions, transition strengths and bandwidths at the 1500nm gain. To analyze the dynamic characteristics of the highpower ytterbiumdoped doubleclad fiber amplifier considering pulses in repetition rates of khz, a dynamic ytterbiumdoped fiber model is necessary. The objective of this lesson is to demonstrate the performance of ytterbiumdoped fiber amplifiers. Fundamental design of a distributed erbiumdoped fiber amplifier for. Fibercore offers a number of different doped fibers including erbium doped fiber for various c and l amplifier configurations and ase applications. Applications of erbiumdoped fibre amplifiers in communications. The field of rareearthdoped fibre lasers and amplifiers has expanded rapidly in recent years and there are now several groups working actively in the area.
Compared to booster optical amplifiers boas and semiconductor optical amplifiers soas, erbium doped fiber amplifiers edfas can amplify femtosecond pulses to significantly higher peak power levels. Erbium doped fibre amplifiers edfa, featuring high gain over a large bandwidth, low intrinsic losses and long fluorescence times, have emerged over the past decades as key enabling components in wdm systems. The fiber has an elliptical core design with high erbium concentration making it attractive for very short fiber use in the laser cavity. The amplifier is based on erbium doped fiber, and can be incorporated directly into an optical network, avoiding the need to convert optical signals to. This machine adopts imported optical module, pump laser and erbium doped amplifier. The objective of this lesson is to demonstrate the amplification of a sequence of gaussian pulses by an ytterbiumdoped fiber amplifier using the dynamic model. A model is presented for erbium doped fiber amplifiers that operate by an upconversion process in which two pump photons at 800 nm are absorbed and can provide an inverted population and hence the ability to amplify signal photons at 850 nm.
Erbium doped fiber amplifier edfa an amplifier is used to boost optical signals to higher power, often used both at launch and within a signal network to maintain a high signal power. The choice of the active and passive components is the key to highperformance ytterbium fiber amplifiers. All supported by our gainmaster simulation software to help you design even the most complex edfas. Erbium doped fibers provide the basic building blocks for fiber optic amplifiers more specifically erbium doped fiber amplifiers edfas used in broadband optical networks and catv applications. Thorlabs corepumped erbiumdoped fiber amplifiers edfas offer 20 dbm 100 mw output power with a low noise figure of amplifiers. White paper introduction to edfa technology optical. Amonics\ specialty products, lband erbium doped fiber amplifiersedfa, are made with high power pump laser and high stability pump combiners, robust in high power boosting. In the shown case, the active fiber is pumped with light from two laser diodes bidirectional pumping, although unidirectional pumping in the forward or backward direction codirectional and counterdirectional pumping. The major glass types potentially useful in this application are considered and compared to silica. Limitations on gain in rareearth doped fiber ampli ers due to ampli ed spontaneous emission andrew miskowiec and thomas max roberts advisor. We report a new ytterbiumdoped active tapered fibre used in the output amplifier stage of a fibre laser system for the generation of megawatt peak power ultrashort pulses in the microjoule.
The edfa amplification region varies from application to application and can be. In terms of gain saturation, fiber amplifiers are very different from semiconductor optical amplifiers soas. Luhs meos gmbh 79427 eschbach august 1998 july 2003 2 basics 2. The scope of this paper is to analyze the output signal power with pump power and length variation in cascaded edfa simulation model performance. The adva edfa erbium doped fiber amplifier products extend the transmission distance between equipment. Based on proprietary allfiber technology, they have been. As for sdm optical amplifiers, corepumped multimode and multicore edfas.
Both approximate expressions and exact numerical solutions for ase and rbs as well as for the amplifier noise figure are examined. Liekki yb120020125dc is a highly doped, double cladding fiber ideally suited for compact, highaveragepower, pulsed amplifier applications where largemodearea and short fiber length are critical for suppression of nonlinear effects. Bulk lidts are determined in fiber preforms composed of two types of fused silica jackets and ytterbiumgermanium doped corescladdings respectively. Over the last few years the erbiumdoped fibre amplifier has emerged as the preferred amplifier for use in transmission systems operating around 1. Output signal power analysis in erbiumdoped fiber amplifier. Ece1640h advanced labs instructions erbium doped fiber amplifier edfa 2 introduction the erbium doped fiber amplifier edfa has made tremendous progress since its invention in 1986. Pdf erbium doped glasses for fiber amplifiers at 1500 nm. Eindhoven university of technology master an optical amplifier. The stability pump optical laser and unique apc automatic power control circuit are employed in it as the key component. An analysis of rayleigh backscattering rbs and amplified spontaneous emission ase in strongly pumped ytterbium fiber amplifiers is presented. Erbium doped fiber edf is a 3 level optical gain medium providing amplification by stimulated emission at 1550nm when pumped at 980nm. Helmy department of electrical and computer engineering, university of toronto, 10 kings college road, toronto, on m5s 3g4, canada. Details on the amplification mechanisms involved are provided in the amplifier comparison section at the bottom of this tab.
Rp photonics encyclopedia erbiumdoped fiber amplifiers. Thuliumdoped fiber amplifier for optical communications at 2 m. We investigate the operation of holmiumdoped fibre amplifiers hdfas in the 2. A miniaturesize erbium doped fibre amplifier msedfa is constructed with a saturation power of 17. Limitations on gain in rareearth doped fiber ampli ers. Ece1640h advanced labs instructions erbiumdoped fiber amplifier edfa 5 5. We report a new ytterbium doped active tapered fibre used in the output amplifier stage of a fibre laser system for the generation of megawatt peak power ultrashort pulses in the microjoule. Thorlabs offers stateoftheart ytterbium doped optical fibers for optical amplifiers, ase light sources, and highpower pulsed and cw fiber laser applications operating with powers in the milliwatt to 100 w range and emitting in the 1100 nm wavelength region. Shortly after their commercialization in the early 1990s, erbium doped fiber amplifiers edfas became a key enabling technology for optical communication. 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. Sm erbiumytterbium doped fiber newport corporation.
Power amplifier for 1083 nm using ytterbium doped fibre. It is based on a ytterbium doped silica fibre which was pumped by a mopa semiconductor laser at 978 nm. Erbium doped fibre amplifier edfa erbium doped fibre amplifier has turned out to be especially well suited. The overall gain excursion does not exceed 4db across all modes. What are the current types and architectures of amplifierbased systems. Two sections of erbium doped fibre with different modedependent gain characteristics are concatenated to equalize gain between modes.
Sdm optical amplifiers utilize an erbiumdoped fiber edf as the amplification medium in the same. An erbiumdoped fiber amplifier edfa is a device that amplifies an optical fiber signal. Edfa has large gain bandwidth, which is typically tens of nanometers and thus actually it is enough to amplify data channels with the highest data rates. Erbiumdoped fiber amplifiers, device and system developments. Fixedpoint realisation of erbium doped fibre amplifier. As a consequence, optical amplifiers need to be most thoroughly tested before their deployment.
Student laboratory experiments on erbium doped fiber. Sm erbiumytterbium doped fiber fibercores sm erbiumytterbium doped fiber df1500y is a singlemode sm erbium er and ytterbium yb doped fiber, providing extremely high levels of pump absorption and emission around the telecoms c and l band windows. A typical setup of a simple erbiumdoped fiber amplifier edfa is shown in figure 1. Diodepumped wideband thuliumdoped fiber amplifiers for. The term doping refers to the process of using chemical elements to facilitate results. The software rp fiber power can be used for analyzing and optimizing fiber amplifiers for example, see a demo case for an erbiumdoped amplifier.
Towards more efficient praseodymium doped fibre amplifiers for the oband op dinsdag 7 november 2006 om 16. Introduction erbium doped fiber amplifiers are the by far most important fiber amplifiers in the context of longrange optical fiber communications. The result are edfas that possess high output power, high gain with very low noise, and are ideal for high power edfa applications. This is due to its high fibretofibre gain, polarisationinsensitivity, quantumlimited 3db noise figure, low crosstalk and high operating bandwidth. Doped fiber amplifiers edfas are designed to increase signal transmission distance making them ideal optical amplification solutions for.
Customized sdh erbiumdoped fiber amplifier datasheet fs. One is the cband conventional band which occupies the spectrum from 1530 nm to 1560 nm and the second is lband long wavelength band which occupies the spectrum ranging from 1560 nm to 1610 nm. Xampp to up the database servers, a server of protocol transfer file ftp and. Optical fiber characterization optical measurement system fiber optic sensing description gip technology bls series are the broadband light source. A model for the erbiumdoped fibre amplifier edfa is presented and discussed. Here, we demonstrate a claddingpumped sdm erbiumdoped fiber amplifier edfa that consists of six uncoupled multimode erbiumdoped. Smallsignal erbiumdoped fibre amplifiers pumped at 980. The most important spectroscopic features of the amplifier are identified and used to formulate a theory that predicts how the amplifier gain varies. High peak power ytterbium doped fiber amplifiers w. One of the more popular optical amplifiers is the erbium doped fibre amplifier, commonly abbreviated as edfa 1, 2. Review of erbiumdoped fiber amplifier article pdf available in international journal of physical sciences 620 september 2011 with 1,862 reads how we measure reads. This is due to its high fibretofibre gain, polarisationinsensitivity, quantumlimited 3db noise figure, low.
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