Calculations and measurements of raman gain coefficients of. Raman amplifier soasemiconductor optical amplifier. For very long fiber spans, the optical signal may be. The raman active medium is often an optical fiber, although it can also be a bulk crystal, a waveguide in a photonic integrated circuit, or a cell with a gas or liquid medium. Raman gain can occur at any signal wavelength by proper choice of the pump wavelength. To compare performance of the hybrid amplifiers, the eye diagrams of detected signals were analyzed and the. Ramanonly amplification combined discrete and distributed or discrete only1,2 and all distributed raman amplification3 have recently demonstrated applications in wdm transmission systems. Home forums fiber edfaraman hybrid amplifier gain edfaraman hybrid amplifier gain dennis jacq joined may 2016 participant hi guys, i am currently simulating edfaraman amplifier in terms of output gain base on the journal gain flattening of edfa using hybrid edfaraman amplifier with reduced channel spacing. Edfa uses the principle of stimulated radiation of edf fiber to amplify the optical. The aim of this article is to establish a comparison between the edfa erbium doped. May 25, 2017 an ultrahigh gain and efficient amplifier based on raman amplification in plasma.
Comparison between the central wavelengths of blue circle nrs spectra and. White paper operational issues in the deployment of raman amplifiers updated november 2012 1 introduction distributed raman amplification dra is a key technology for modern optical communications systems, and especially in coherent links and mesh networks. This paper presents an experimental study on the performance comparison of three different schemes of singlepump dispersioncompensating fiber dcfbased raman erbiumdoped fiber amplifier edfa hybrid amplifiers together with a dcfbased ramanonly amplifier in terms of static properties, dynamic properties, and system impact. Abstract in this paper, comparison of various advance data modulation formats in 4. Research article noise gain features of fiber raman amplifier georgiis. Chandigarh group of colleges, ladran, mohali, india. Discrete lumped raman amplifier ra the amplifier consists of a coil of dedicated fiber together with pumps. What is the difference between edfa and raman amplifiers in long distance dwdm. Optical ampsraman and erbiumdoped fiber amplifiers pp. Edfa, semiconductor optical amplifier soa and fiber raman amplifier. However, additional issues arise in raman ampli cation that are not present in edfa. An ultrahigh gain and efficient amplifier based on raman amplification in plasma.
An optical amplifier is a device that amplifies an optical signal directly, without the need to first convert it to an electrical signal. Edfas are widely used in comparison to other similar amplifiers and optical devices for larger wavelength optical communication system because of its advantages of. Comparison of the optical amplifiers edfa and soa based on the. Semiconductor optical amplifiers soas fiber raman and brillouin amplifiers rare earth doped fiber amplifiers erbium edfa 1500 nm. Gain flattening of edfa using hybrid edfaraman amplifier w. If you continue browsing the site, you agree to the use of cookies on this website. Comparison of edfa and raman amplifiers effects on rz and nrz. An optical amplifier may be thought of as a laser without an optical cavity, or one in which feedback from the cavity is suppressed.
Raman amplifier noise factor is defined as the osnr at the input of the amplifier to the osnr at the output of the amplifier. Rp photonics encyclopedia raman amplifiers, fiber amplifier. To compare performance of the hybrid amplifiers, the eye diagrams of detected signals were analyzed and the maximum transmission distances were found. A raman amplifier is an optical amplifier based on raman gain. Gain flattening of edfa using hybrid edfaraman amplifier. Raman amplification provides more flexibility than edfa. The pump laser, in this case, has a wavelength of 1535 nm. In optical amplifiers using erbium or other rare earth ions as the medium, the gain wavelength band is determined by the energy level of the ions, whereas in raman amplifiers. For the uninitiated, edfa erbium doped fiber amplifier. In this paper various configurations of raman amplifier have been studied.
It is reported that ramanedfa shows better overall system performance as compared to ydfaedfa. This paper presents an experimental study on the performance comparison of three different schemes of singlepump dispersioncompensating fiber dcfbased ramanerbiumdoped fiber amplifier edfa hybrid amplifiers together with a dcfbased ramanonly amplifier in terms of static properties, dynamic properties, and system impact. We have realized the different hybrid amplifiers and. The result of these simulation will be analyzed in terms of gain characteristics. As far as i know, edfa and raman amplifiers are the two main optical options for signal amplification in longerhaul fiber links. To eliminate these losses optical for broadband band amplification, and are. Comparison of the optical amplifiers edfa and soa based on. In this comparison, the gain and noise figure profiles plotted as a function of signal wavelength are calculated for different values of input signal power, edfa pump power and ra pump powers for the three types of amplifiers, edfaraman hybrid, raman only and edfa only amplifier. Abstractwe have investigated the performance comparison of different hybrid optical amplifiers ramanedfa,raman. Gain flattening of edfa using hybrid edfa raman amplifier w ith reduced channel spacing. Comparative study of all optical amplifiers semantic scholar.
The proposed configuration consists of 16, 32 and 64 gbps channels at speed of 10 gbps. Nf the difference in signalnoise ratio at the input and out put of the. In this paper, we experimentally demonstrate a blackbox raman assisted psa amplifier with 6db total insertion loss including 2db idler generation loss. Calculations and measurements of raman gain coefficients of different fiber types 1 chapter 1 introduction 1. Erbiumdoped fiber amplifier edfa and raman amplifier ra are the most popular ones, which are used widely in the optical communications systems. The aim of this article is to establish a comparison between the edfa erbium doped fibre amplifier and soa semiconductor optical amplifier optical amplifiers in the wdm wavelength division. The temperature dependence of cband edfa gain spectrum was compensated passively by using distributed raman amplifier with reverse temperature dependence. A raman amplifier uses the effect of raman scattering. White paper introduction to edfa technology june 2009 1 introduction shortly after their commercialization in the early 1990s, erbium doped fiber amplifiers edfas became a key enabling technology for optical communication networks, and have since comprised the vast majority of all optical amplifiers deployed in the field. Abstractwe numerically compare the performance of a bidi rectionally pumped raman and an erbiumdoped fiber amplifier. The circulator provides a convenient means of injecting light backwards in to the transmission path with minimal optical loss. Pdf comparison of the optical amplifiers edfa and soa. White paper operational issues in the deployment of raman. In this comparison, the gain and noise figure profiles plotted as a function of signal wavelength are calculated for different values of input signal power, edfa pump power and ra pump powers for the three types of amplifiers, edfa raman hybrid, raman only and edfa only amplifier.
Therefore, a novel parameter is introduced the nonlinear weight to allow a direct comparison between system configurations with different power distributions. Comparative performance of ramansoa and raman edfa. Erbium doped fiber amplifier is the major type of the fiber amplifier used to boost the signal in the wdm fiber optic system, as we know it is wdm that increase the capacity of the fiber. Pdf comparison of edfa and raman amplifiers effects on rz. 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. The formation dynamics of the optical noise in a silica single mode fiber smf as function of the pump power variation in the counter pumped fiber raman amplifier fra is experimentally studied.
This blackbox amplifier gives more than 25db net gain on a. The ratio between the power of amplified spontaneous emission and the power of incoherent optical noise is quantitatively determined by detailed analysis of experimental data in the pump powers range. Today, we are going to study and compare different types of optical amplifiers in this paper. In 1985, where the invention of erbiumdoped fiber amplifier edfa has attracted great interest in the field of communication, but the applications of edfas have not been confined to telecommunications, such as, the amplification of pulses to provide a source of very high peak powers. Hybrid ramanerbiumdoped fiber amplifiers are designed in order to maximize the span length and to minimize the. Compared to a edfa, the main advantages of raman ampli cation are an improved noise gure and improved gain atness. The better q factor is provided by the raman amplifier 26.
Osa a detailed experimental study on singlepump ramanedfa. Abstractwe have investigated the performance comparison of different hybrid optical amplifiers ramanedfa,ramansoa,soaedfa,edfaramanedfa. Comparative performance of ramansoa and ramanedfa hybrid. Comparison of the optical amplifiers edfa and soa based on the ber and qfactor in cband article pdf available in advances in optical technologies 20171. Performance study of macrobending edfaraman hybrid optical. What is the tradeoff between one type and the other. Hybrid raman erbiumdoped fiber amplifiers are designed in order to maximize the span length and to minimize the. Both gain and gain shape can be adjusted by pump powers.
Recently raman amplifiers have started to attract much attention because the noise figure is smaller and it is less expensive than the edfa. Comparison between different configurations of hybrid raman. The ratio between the power of amplified spontaneous emission and the power of incoherent optical noise is quantitatively determined by detailed analysis of experimental data. Introduction to optical amplifiers 417 a raman amplifier is distributed over a long span of optical fiber.
At input signal30 dbm, the gain of edfaraman hybrid amplifier is 18 db, 12. The maximum repeaterless transmission distance for the worst case scenario at 25ghz channel spacing is 120 and 100km for ramanedfa and ydfaedfa respectively. 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. Edfa amplifier archives tutorials of fiber optic products. Semiconductor optical amplifiers soas fiber raman and brillouin amplifiers 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. Ramanonly amplifier type i, ramanedfa hybrid amplifiers. To compare performance of the hybrid amplifiers, the eye. Feb 11, 20 raman amplifier types there are basically two types of raman amplifiers as given here. In this paper, we experimentally demonstrate a blackbox ramanassisted psa amplifier with 6db total insertion loss including 2db idler generation loss.
Before the comparison of the different types of optical amplifiers, lets take a. The carefully prepared comprehensive documentation includes a pdf manual and an interactive online help system. The bending radius is 4 mm with edfa length 10 m with forward pump power in the range 100500 mw and raman amplifier length 1255 km with backward pump power variations 80200 mw is considered in our model. Gain flattening of edfa using hybrid edfaraman amplifier w ith reduced channel spacing. Raman gain coefficient is strongly dependent on the frequency shift between the pump and signal frequencies. Kalera, 20, 1 performance evaluation of edfa, raman and soa optical amplifier for wdm systems compared on the basis of transmission distance 40200 km and dispersion 210 psnmkm with and without nonlinearities. A comparison of optical amplifiers in optical communication systems edfa, soa and raman. Compared with raman amplifier, edfa amplifier also features many advantages, such as, low cost, high pump power utilization, high energy conversion efficiency, good gain stability and high gain with little crosstalk. Comparison between different configurations of hybrid. Dec 16, 2014 edfa, semiconductor optical amplifier soa and fiber raman amplifier. Comparison of various configurations of hybrid raman. The erbiumion doped fiber is pumped by feeding the light from a laser pump.
Characteristics of raman amplifiers in fiber optic. An increase in performance is demonstrated using erbium doped fiber amplifier edfa with proper gain control scheme that allows a dt s operates with simplex code. The difference between edfa and raman amplifier the main di erence. Comparison of advance data modulation formats in 4. Is it just a matter of edfas being cheaper and raman amplifiers having greater gain ranges, or is there something more major that i am missing. They perform experiment by comparing the performance of three types of singlepump highly efficient dcf raman edfa hybrid amplifier in terms of gain, noise figure and stimulated brillouin scatteringinduced penalty. Home forums general difference between using optical amplifier and edfa difference between using optical amplifier and edfa fayiqa naqshbandi joined april 2015 spectator i would like to know what is the main difference between using edfa and optical amplifier when both can be used to give near about same performance is there more info. Pdf the difference between edfa and raman amplifier. Typically, dra is used in conjunction with conventional. Edfa uses the principle of stimulated radiation of edf b er to.
Abstract in this paper, the hybrid optical amplifier composed. Optical ampsraman and erbium doped fiber amplifiers edfas pp. Today, we are going to study and compare different types of optical. Comparison of edfa and raman amplifiers effects on rz and nrz encoding techniques in dwdm optical network with bit rate of 80 gbs.
Performance comparison of different hybrid amplifiers. Fiber raman amplifier is specially designed for amplification of optical signals in longdistance optical transmission systems and dense wavelength division multiplexed optical transmission systems, and can achieve high gain and low noise amplification for optical signals in. Table 1 comparison between optical amplifier features edfa soa raman. Comparison of edfa and raman amplifiers effects on rz and. Ramanbased distributed temperature sensor using simplex. Except this, is there any main features, advantages or disadvantages about these two optical amplifiers that i am. A comparison of optical amplifiers in optical communication. Experimental demonstration of ramanassisted phase sensitive. Boosting of an optical signal without any conversion of. The most practical optical amplifiers to date include the soa and edfa types.
The primary difference is that they do not have a resonator. Amplifier booster, to increase the output power at the beginning of the link. Firstly, it has a wide band, while the band of edfa is only from 1525 nm to 1565 nm and 1570 nm to 1610 nm. In the distance range 40120 km, raman and edfa amplifier have compareable qfactor. Dyriv taras shevchenko national university of kyiv, g, academician glushkov prospect, kyiv, ukraine. In this way, a raman amplifier can be combinedfa booster or inlineed with a n.
At least the loss limitation can be partially canceled out by the introduction of optical. Calculations and measurements of raman gain coefficients. A simplified schematic illustration of an edfa optical amplifier. Types of optical amplifiers, raman amplifier vs edfa. Raman amplifier uses the stimulated raman scattering srs phenomenon, where a strong pump laser at shorter wavelength provides gain to signals at longer wavelengths. The different amplifiers, such as erbium doped fiber amplifiers edfa, raman amplifiers ra. Performance comparison of different hybrid amplifiers for. Optimizing a raman amplifier is more complicated than for an edfa. Pdf in this paper, comparative study of the gain and noise figure for edfa raman hybrid. Are there areas where raman amplifiers are clearly better. Common fiber optical amplifiers include erbiumdoped fiber amplifier or edfa optical amplifier, raman fiber amplifier, and silicon optical amplifier soa.
For this purpose, light with high power and a corresponding wavelength is pumped into the fiber. A lot of interest was raised, as to whether allraman amplification is better than the widely used counterpumped ramanedfa hybrid amplification. Comparative performance of ramansoa and raman edfa hybrid. An ultrahigh gain and efficient amplifier based on raman. In this paper, we present an analytical study of a macrobending edfaraman hybrid optical amplifier. Edfa vs raman optical amplifier fiber optic communication. New pumping methods and materials are also improving the performance of raman amplifiers. The performance of dwdm system is enhanced throgh optical amplifier. In this study, by simulating a dwdm optical link with a bit rate of 80 gbs and a link span of 80 km, the effects of edfa and ra on nrz and rz encoding techniques for modulation are investigated. Currently it is not possible to create a fully optical communication system without a software tool which simulates an optical communication line in real conditions prior to its construction. In optical communication the edfa fibre amplifiers, soa semiconductor. Home forums general difference between using optical amplifier and edfa difference between using optical amplifier and edfa karan ahuja joined april 2016 spectator hi can someone please tell me what is the major difference between using an optical amplifier and an edfa in a system design. Also at 120 km edfa, raman and soa have almost the same qfactor. Typically, the raman noise figure is 2 to 0 db, which is about 6 db better than the edfa noise figure.
Comparison of edfa and bidirectionally pumped raman amplifier. Before the comparison of the different types of optical amplifiers, lets take a closer look at fiber optic amplifier. Distributed raman amplifier dra uses the transmission fiber itself as the medium, into which a backward pump is injected. After knowing the basic information of edfa and raman optical amplifiers, you must consider that the raman amplifier performs better for two main reasons. In this work we present a comparison between simplex coded and optical amplified simplex coded raman based distributed temperature sensing dts. Pdf in this paper, comparative study of the gain and noise figure for edfaraman hybrid. Pdf a survey on gain flattening in hybrid amplifier in optical. Research article noise gain features of fiber raman amplifier. As the optical signal travels in a fiber waveguide, it suffers attenuation loss of power. This paper simulated the characteristics of raman amplifier by solving the coupled raman amplifiers equations using the runge kutta method.
Ramanbased distributed temperature sensor using simplex code. Here offers a table that shows the differences between edfa and raman optical amplifiers for your reference. A raman amplifier is an optical amplifier based on raman gain, which results from the effect of stimulated raman scattering. Comparison of edfa and raman amplifiers effects on. In this video, i have covered raman amplifier with following outlines.
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