Based on this and using an occupation number model, we determined the limiting spectral efficiency of information transfer in such an amplifier. Erbium doped fiber amplifier edfa is an optical repeater device that is used to boost the intensity of optical signals being carried through a fiber optic communications system. A pump radiation is injected in the core of an erbium doped fiber edf together with the signal to be amplified. Device and system developments brings telecommunications professionals up to date.
Different pumping categories of erbium doped fiber. In this paper we design a 120 nm bandwidth erbiumdoped fiber amplifier using a seed light injection method for the first time. Modelling of multimode erbiumdoped fibre amplifiers for. This phd thesis, undertaken within the framework of modegap, covers the design and optimization of highperformance inline multimode erbiumdoped fiber amplifiers mmedfas or fewmode fm edfa for nextgeneration sdm transmission systems based on modedivision multiplexing mdm. In particular, the possibility of obtaining very small or very largemode area with this new kind of optical fibers has been exploited to realize new fiber lasers 6. Optimization tool for erbium doped fibre amplifiers electrical and. With over 30 years experience of the specialty optical fiber industry, fibercore ltd, the world leader in its field, is exclusively dedicated to the design, manufacture and commercialization of specialty fibers. Amplified spontaneous emission ase is taken into account so that the gain of asesaturated erbiumdoped fiber amplifiers is calculated properly. A 7core erbium doped doubleclad fiber amplifier with sidecoupled pumping kazi s. Erbium doped fiber amplifiers edfa is widely used multiplexed signals in the wavelength region of 8 nm in fiber optical networks. 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. Eindhoven university of technology master dynamical. In this paper we analyze gain and noise figure of a c and an l band edfa verifying experimentally.
Design of multimode erbiumdoped fiber amplifiers for low. Optimized of erbiumdopedfiber amplifiers edfa parameters. Helmy department of electrical and computer engineering, university of toronto, 10 kings college road, toronto, on m5s 3g4, canada. Uptonow, edfas are the optical amplifiers that have demonstrated the greatest potential in the context of sdm, especially when compared to raman amplifiers or parametric amplifiers. A difference in strongsignal gain between copropagating and counterpropagating signal pump schemes in the presence of pump excitedstate absorption is predicted, and this is confirmed by experiment. Digiovanni ofs laboratories, 19 schoolhouse road, somerset, new jersey 08873. Modeling the gain and amplified spontaneous emission spectra. Boosting of an optical signal without any conversion of.
We have used a modified black box model to calculate the gain and amplified spontaneous emission spectra for an erbiumdoped fiber amplifier. Randy giles, member, ieee, and emmanuel desurvire, member, ieee invited paper abstracterbiumdoped fiber amplifiers are modeled using the propagation and rate equations of a homogeneous, twolevel laser me dium. Importance of erbiumdoped fiber uniformity perhaps the most critical parameter for erbiumdoped fiber in high performance amplifiers is the uniformity of the gain spectrum from one coil to the next. Fundamental design of a distributed erbiumdoped fiber amplifier for. Numerical methods are used to analyze the effects of optical modes and erbium confinement on amplifier performance, and to calculate both the gain and amplified spontaneous emission ase spectra. The core element of a fiber amplifier is a piece of rareearthdoped fiber, which can provide. Modeling a single doped quantum dot fiber amplifier. Eindhoven university of technology master an optical amplifier.
Numerical solution of a general rateequation model of an erbiumdoped fiber amplifier highlights several important features of the device. Edfa erbium doped fiber amplifier tutorial exfiber optical technologies co. The headway in consumer electronics is anticipated to trigger the interest for erbiumdoped fiber amplifier in coming years. Numerical methods are used to analyze the effects of optical modes and erbium confinement on amplifier performance, and to calculate both the gain and amplified spontaneous.
Available in boost, inline, and preamp configurations, the different models cover various transmission scenarios at points all along the optical communications path. A 7core erbium doped doubleclad fiber amplifier with side. Erbiumdoped fiber amplifiers are the by far most important fiber amplifiers in the context of longrange optical fiber communications. A fiber amplifier with a small signal net gain of 41 db at 1535 nm and 21 db over the full cband is demonstrated using a newly developed 8cmlong erbiumdoped phosphate fiber excited with a 1w, 975nm multimode laser diode. Based on the method, a novel splitband edfa configuration is designed. In this paper, a simulation of an edfa has been studied to characterize gain, noise figure of a forward. Erbium is the most interesting element as edfa can operate in a broad range within 1550 nm window at which the silica attenuation in minimum 16,17.
Erbium doped fiber amplifiers is a bonafide work done by mr. It is effective for wavelength multiplexing several signals and for different pumping. Atomic level ions and atoms are critical for the amplification phenomena. It is shown that the transients associated with gain saturation and gain recovery during multichannel amplification have long characteristic times, i. In this case, by setting in 1 the time derivative equal to zero, combining. Noise performance of erbiumdoped fiber amplifiers with. Theoretical modeling of erbiumdoped fiber amplifiers with. Based on this and using an occupation number model, we determined the limiting spectral. Optical amplifiers, edfa, erbium doped fiber, gain, noise figure. All a band of almost 30 to 35 nm extending from 1530 to1565 channels modulated with modulation rate to achieve data. Written by one of the pioneers in the field, this unique reference provides. Pdf highconcentration erbiumdoped fibers used in lband erbiumdoped fiber amplifier edfa. Pdf the solution of the rate equations that describe an erbiumdoped fiber amplifier is investigated, and the possibility of obtaining an analytical. Osa theoretical modeling of erbiumdoped fiber amplifiers.
Erbium doped fiber amplifier are being utilized as a part of scientific and medical applications to satisfy the prerequisite for interchanges. The erbium ion is a crucial factor for the generation of the stimulated and spontaneous emission. The first case can be described by a threelevel laser model whereas the second case is a quasithreelevel system. We propose a novel numerical method based on genetic algorithm ga to solve the evolution equations that are the basis of modeling multichannel erbiumdoped fiber amplifiers edfas. Fmedfas have an architecture similar to singlemode erbium doped fiber amplifiers smedfas. Boosting of an optical signal without any conversion of the. The gain and noise performance are then examined under forward and reverse pumping. This thesis describes theoretical and experimental studies on two subjects. Rp photonics encyclopedia erbiumdoped fiber amplifiers.
Simple continuouswave, gainswitched and qswitched fiber lasers. Gain and noise figure performance of erbiumdoped fiber amplifiers. Introduction erbiumdoped fiber amplifiers are the by far most important fiber amplifiers in the context of longrange optical fiber communications. The performance of compact multimode pumped erbium doped phosphate fiber amplifiers is presented. Invited paper en efficient simulation model of the erbiumdoped. Contribute to jomiripyfiberamp development by creating an account on github. Pyfiberamp is a rate equation simulation library for rareearthdoped fiber amplifiers and fiber lasers partly based on the giles model. An analytic method is described for fully characterizing the gain of an erbiumdoped fiber amplifier edfa that is based on easily measured monochromatic absorption data. Here, we study multimode erbiumdoped fiber amplifiers mmedfas for signals spatially multiplexed in 12 modes six spatial modes in two polarizations.
A fiber amplifier with a small signal net gain of 41 db at 1535 nm and 21 db over the full cband is demonstrated using a newly developed 8cmlong erbium doped phosphate fiber excited with a 1w, 975nm multimode laser diode. Pdf the exact gain shape profile of erbium doped fiber amplifiers edfas are depends on fiber length and er 3 ion densities. Compact multimode pumped erbiumdoped phosphate fiber amplifiers. Amplified spontaneous emission ase is taken into account so that the gain of asesaturated erbium doped fiber amplifiers is calculated properly. The noise performance of an erbium doped fiber amplifier edfa is characterized by modeling optical amplifiers as fourlevel or threelevel systems. Modeling the gain and amplified spontaneous emission. This phd thesis, undertaken within the framework of modegap, covers the design and optimization of highperformance inline multimode erbium doped fiber amplifiers mmedfas or fewmode fm edfa for nextgeneration sdm transmission systems based on modedivision multiplexing mdm. Pdf modeling erbiumdoped fiber amplifiers semantic scholar. Design optimization for efficient erbiumdoped fiber amplifiers. Erbiumdoped fiber amplifiers edfa, featuring high gain over a large wavelength. Numerical solution of a general rateequation model of an erbium doped fiber amplifier highlights several important features of the device. Modeling erbiumdoped fiber amplifiers, in journal of lightwave technology, vol. Optical ampsraman and erbium doped fiber amplifiers edfas pp. Erbiumdoped fiber amplifier edfa is an optical repeater device that is used to boost the intensity of optical signals being carried through a fiber optic communications system how it works.
Some of the notable results achieved with erbiumdoped fiber amplifiers are 5 1 db optical gain 7, 100mw saturated output power 8, and 3db noise figure 9. A new kind of dopantsemiconductor nanocrystal quantum dot doped into a fiber forming a quantumdotdoped fiber and thereby configuring a quantumdotdoped fiber amplifier qdfa is presented. Edfas are now used for the combined c and l bands 18to accommodate bandwidthhungry internet based applications of the near. An optical fiber is doped with the rare earth element erbium so that the glass fiber can absorb light at one frequency and emit light at another frequency. The analytic expressions presented, which involve the solution of one transcendental equation, can predict signal. We propose a novel numerical method based on genetic algorithm ga to solve the evolution equations that are the basis of modeling multichannel erbium doped fiber amplifiers edfas. Pdf data communication systems are increasingly employing optical fiber.
Edfa can amplify signals over 1550 nm1558nm with frequency spacing is 0. Latest results and future perspectives on fewmode erbium. Novel splitband erbiumdoped fiber amplifier sciencedirect. Erbiumdoped fiber amplifiers are traditionally pumped with either 980 nm or 1480 nm laser diodes, which correspond to exciting 11 2 4i and 2 4i levels respectively. It is shown that when the wavelength of the seed light varies from 1520 to 1570 nm, the gain at 1610 nm reaches maximum near 1553 nm and increases as the seed light power. The 9000edfa series are high quality, erbium doped fiber amplifiers used to extend signals in longhaul optical communications applications. Because corning produces fiber via the ovd process, it is by far the most uniform in the world. 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. We describe an analytic method that calculates accurately within a 1. Pdf modeling highconcentration lband edfa at high optical. At least the loss limitation can be partially canceled out by the introduction of optical.
Novel numerical method to model multichannel erbiumdoped. Erbium doped fiber amplifiers are traditionally pumped with either 980 nm or 1480 nm laser diodes, which correspond to exciting 11 2 4i and 2 4i levels respectively. 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. In the mmedfas, minimizing the differential modal gain dmg is of paramount importance to prevent system. The choice of the model of erbiumdoped fiber amplifiers edfas is a key issue. Implementation of three functional devices using erbium. In this paper we design a 120 nm bandwidth erbium doped fiber amplifier using a seed light injection method for the first time. Modeling of gain and noise in erbiumdoped fiber amplifiers. The optical signal is injected into this fiber, along with the light from a special pump laser that is designed to excite the erbium ions. Erbium fiber amplifiers is a comprehensive introduction to the increasingly important topic of optical amplification. In fiber amplifiers, low modedependent gain mdg minimizes the loss of capacity and the potential for outage 7. Modeling of gain in erbiumdoped fiber amplifiers ieee.
The most common example is the erbium doped fiber amplifier edfa, where the. Influence of fiber parameters to the erbiumdoped fiber amplifier. Erbiumdoped fiber amplifier market size, share, growth. Compact multimode pumped erbiumdoped phosphate fiber. Wavelength division multiplexing is a technology for combine number of different. Here, we study multimode erbium doped fiber amplifiers mmedfas for signals spatially multiplexed in 12 modes six spatial modes in two polarizations. This thesis presents a novel complex and precise simulation model combining an.
Pdf numerical and analytical modeling of polarization. The gain dynamics of erbiumdoped fiber amplifiers are studied both experimentally and theoretically. Erbium doped fibre amplifiers edfa, featuring high gain over a large. Black box model of erbiumdoped fiber amplifiers in c and l bands a. A 7core erbium doped doubleclad fiber amplifier with.
In particular, the erbiumdoped fiber amplifier edfa is one example of an optical fiber amplifier that is widely. With product ranges available offering polarization maintaining, bendinsensitive, rareearth doped, claddingpump and photosensitive fibers. Modelling of multimode erbiumdoped fibre amplifiers for mode. Theory on the timedynamic simulations is not yet included. After the pioneering work on fiber lasers 11, 2, research on rareearth doped fibers remained nearly dormant until the demonstration of highgain erbium doped. The performance of compact multimode pumped erbiumdoped phosphate fiber amplifiers is presented. The headway in consumer electronics is anticipated to trigger the interest for erbium doped fiber amplifier in coming years. The noise performance of an erbiumdoped fiber amplifier edfa is characterized by modeling optical amplifiers as fourlevel or threelevel systems.
Pdf analytic modeling of erbiumdoped fiber amplifiers. The detriment in the noise figure previously associated. Analytic modeling of erbiumdoped fiber amplifiers on the basis of intensitydependent overlapping factors. Doped fiber amplifiers dfas are optical amplifiers that use a doped optical fiber as a gain medium to amplify an optical signal. Numerical methods are used to analyze the effects of optical. Pdf modeling erbiumdoped fiber amplifiers semantic. Thorlabs corepumped erbiumdoped fiber amplifiers edfas offer 20 dbm 100 mw output power with a low noise figure of erbium doped fiber amplifiers are modeled using the propagation and rate equations of a homogeneous twolevel laser medium. Modeling of gain in erbiumdoped fiber amplifiers abstract.
Black box model of erbiumdoped fiber amplifiers in c and l bands. W 1 control interface rs232 connector type female with 2 x 3 pins environmental information operating case temperature c 0 65 storage temperature c 20 80. 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. Erbiumdoped fiber amplifier are being utilized as a part of scientific and medical applications to satisfy the prerequisite for interchanges. 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. Implementation of three functional devices using erbiumdoped fibers. Oct 23, 2019 pyfiberamp is a rate equation simulation library for rareearth doped fiber amplifiers and fiber lasers partly based on the giles model. Characterization and modeling of erbiumdoped fiber. Black box model of erbiumdoped fiber amplifiers in c and.
Numerical and analytical modeling of polarizationdependent gain in erbiumdoped fiber amplifiers. Simple, experimentallyverified expressions are presented for the signal gain, pump absorption and output noise spectrum of erbiumdoped fiber amplifiers having arbitrary numbers of signals and pumps of arbitrary power levels and propagation directions. Broadband wdm could only combine two channels at 10 and. In the last case, there are two levels in the light generation. Erbiumdoped fiber amplifiers are modeled using the propagation and rate equations of a homogeneous twolevel laser medium. These are just a handful of the essential questions answered in erbiumdoped fiber amplifiers. Modeling erbiumdoped fiber amplifiers ieee journals. Design and development of erbium doped fiber amplifiers. Analytic modeling of highgain erbiumdoped fiber amplifiers. Optical ampsraman and erbiumdoped fiber amplifiers pp.
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