Difference between edfa and raman amplifier pdf

Calculations and measurements of raman gain coefficients. Raman amplifier noise factor is defined as the osnr at the input of the amplifier to the osnr at the output of the amplifier. Raman amplifiers are broadband and wavelength agnostic. It is used in the telecommunications field and in various types of. A lot of works have been reported in the literature on.

Implementation of three functional devices using erbium. Both profiles are presented in figure 5 in the stokes shifts range of 025. Typically, dra is used in conjunction with conventional. Comparative performance of ramansoa and raman edfa hybrid. Doped fiber amplifier edfa including arbitrary gain band, better adjustability of gain shape, and better linearity. If you continue browsing the site, you agree to the use of cookies on this website.

The main difference between the soa and edfa amplifiers is the active area where the gain generation happens. Optical ampsraman and erbium doped fiber amplifiers edfas pp. Characteristics of raman amplifiers in fiber optic. Noise figure analysis of distributed fibre raman amplifier g. The power difference between coherent signal and incoherent noise is a result of. Feb 11, 20 raman amplifier types there are basically two types of raman amplifiers as given here. Edfas, with the raman pump module serving as a preamplifier to the edfa. In the edfa case it is generated directly in the optical fibre but in the case of soa it happens directly in the structure of the semiconductor. Common fiber optical amplifiers include erbiumdoped fiber amplifier or edfa optical amplifier, raman fiber amplifier, and silicon optical amplifier soa. It is based on threelevel amplification mechanism in the c.

Erbiumdoped fiber amplifier edfa and raman amplifier ra are the most popular ones, which are used widely in the optical communications systems. Is it just a matter of edfas being cheaper and raman amplifiers having greater gain ranges, or. Raman amplifier gain equations gr is called the raman gain coefficient units of mw. Raman amplifiers provide a simple, single platform for longhaul and ultralonghaul amplifier needs.

Rare earth doped fiber amplifiers erbium edfa 1500 nm, praseodymium. Are there areas where raman amplifiers are clearly better. Edfa vs raman amplifier as far as i know, edfa and raman amplifiers are the two main optical options for signal amplification in longerhaul fiber links. New pumping methods and materials are also improving the performance of raman amplifiers. The circulator provides a convenient means of injecting light backwards in to the transmission path with minimal optical loss. Direct comparisons between edfas and distributed raman amplifiers are complicated by the difference between the lumped and distributed types, but if the total pumping power necessary to get a. Hybrid edfa amplifier, the system analyzed by using one stage 5mraman amplifier.

Edfa uses the principle of stimulated radiation of edf fiber to amplify the optical. Edfa, semiconductor optical amplifier soa and fiber raman amplifier. Chandigarh group of colleges, ladran, mohali, india. Raman gain can occur at any signal wavelength by proper choice of the pump wavelength. 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. 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 profile outlined above in section 1 is a zero kelvin cross section. Direct comparisons between edfas and distributed raman amplifiers are complicated by the difference between the lumped and distributed types, but if the total pumping power necessary to get a bandwidth of 100 nm is 600 mw, it can be seen that raman amplifiers cannot be dismissed as inherently less efficient than edfas. Characteristic of discrete raman amplifier at different. As far as i know, edfa and raman amplifiers are the two main optical options for signal amplification in longerhaul fiber links. Performance analysis of raman edfa hybrid optical amplifier in dense wavelength division. Gain flattening of edfa using hybrid edfaraman amplifier. Comparison of the optical amplifiers edfa and soa based on.

Edfa amplifier archives tutorials of fiber optic products. Here offers a table that shows the differences between edfa and raman optical amplifiers for your reference. The difference between edfa and raman amplifier the main di erence. The raman amplifier has greater gain ranges while edfa amplifier costs less. Raman technology is complex a proper design based on raman amplification from the ground up results in equipment as simple, if not simpler, to operate than an edfabased product. Performance analysis of raman edfa hybrid optical amplifier in dense wavelength division multiplexed is a contribution to design of modern high capacity transmission systems. Mar 03, 2011 edfa stands for erbium doped fiber amplifier and it is one type of many different optical amplifiers. In many cases the raman and edfa modules are combined into a single hybrid ramanedfa module, thus reducing costs. It is reported that ramanedfa shows better overall system performance as compared to ydfaedfa.

Raman amplifier soasemiconductor optical amplifier. In 1985, where the invention of erbiumdoped fiber amplifier edfa has attracted great interest in the field of communication, but the applications of. In the distance range 40120 km, raman and edfa amplifier have compareable qfactor. 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.

Jan 04, 2012 raman amplifier is another important optical amplifier other than edfa. Raman amplifier is another important optical amplifier other than edfa. What is the difference between edfa and raman amplifiers. Gain flattening of edfa using hybrid edfaraman amplifier w. An optical amplifier is a device that amplifies an optical signal directly, without the need to first convert it to an electrical signal. White paper operational issues in the deployment of raman. Wdm optical network analysis using edfa and raman amplifier. The different amplifiers, such as erbium doped fiber amplifiers edfa, raman amplifiers ra, semiconductor optical amplifier soa.

Pdf comparative study of performance of edfaraman hybrid. The frequency difference between fp and fs has to match a relationship in order to fully use of this non. Optical ampsraman and erbiumdoped fiber amplifiers pp. After knowing the basic information of edfa and raman optical amplifiers, you must consider that the raman amplifier performs better for two main reasons. What is the tradeoff between one type and the other. Research article noise gain features of fiber raman amplifier. Types of optical amplifiers, raman amplifier vs edfa. A raman amplifier uses the effect of raman scattering. Edfa uses the principle of stimulated radiation of edf b er to. Before the comparison of the different types of optical amplifiers, lets take a closer look at fiber optic amplifier. 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.

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. Amplifier booster, to increase the output power at the beginning of the link. The main difference between these two techniques is related to the gain medium where the amplification of. Introduction to optical amplifiers 417 a raman amplifier is distributed over a long span of optical fiber. Comparative performance of ramansoa and ramanedfa hybrid. Analysis of gain and nf using raman and hybrid rfaedfa. Abstract in this paper, the hybrid optical amplifier composed of single erbium doped fiber amplifier and a raman amplifier is proposed for wavelength. In the pulse method, since the metastable erbium ions in the edfa require a relatively long time to recover the ground state, if the onoff switching cycle of the optical input to the edfa is sufficiently shorter than the recovery time, the ase can be measured directly by measuring the output of the edfa while the optical signal is off. Dear ehab, the edfa and raman amplifiers are based on two different physical phenomenons. Improvement of raman gain with different parameters in.

Implementation of three functional devices using erbiumdoped fibers. May 01, 2016 hi can someone please tell me what is the major difference between using an optical amplifier and an edfa in a system design. The principal advantage of raman amplification is its ability to provide distributed amplification within the transmission fiber, thereby increasing the length of spans between amplifier and regeneration sites. Pdf comparison of edfa and raman amplifiers effects on rz. Is it just a matter of edfa s being cheaper and raman amplifiers having greater gain ranges, or is there something more major that i am missing. Dec 16, 2014 edfa, semiconductor optical amplifier soa and fiber raman amplifier. Raman amplification uses the raman effect to achieve energy conversion and amplify the optical signal. Both are optical amplifiers and both are present in the optical folder of the amplifier library of the optisystem. Comparative performance of ramansoa and raman edfa. Calculations and measurements of raman gain coefficients of. Today, we are going to study and compare different types of optical amplifiers in this paper.

The two key elements of the raman optical amplifier are the pump laser and the directional coupler. In this study, by simulating a dwdm optical link with a. 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. Edfa vs raman optical amplifier fiber optic communication. At least the loss limitation can be partially canceled out by the introduction of optical. An ultrahigh gain and efficient amplifier based on raman. Dyriv taras shevchenko national university of kyiv, g, academician glushkov prospect, kyiv, ukraine. Finisars hybrid raman edfa module enables costeffective deployment of ultralong haul networks as well as the extension of existing longhaul, regional and metro networks, without the need for 3r oeo regeneration.

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. To compare performance of the hybrid amplifiers, the eye. The ramanactive medium is often an optical fiber, although it can also. The main difference between these two techniques is related to the gain medium where the amplification of signal takes place. At this part, we analyze the gain and nf by using the two stages hybrid amplifier with edfa. Abstract in this paper, the hybrid optical amplifier composed. 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.

The hybrid module consists of a count\ erpropagating raman pump unit and a variable gain \vg\ edfa. Optical amplifiers amplify an optical signal directly, without the need to first convert it to. 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. Helmy department of electrical and computer engineering, university of toronto, 10 kings college road, toronto, on m5s 3g4, canada. Several types of optical amplifiers have since been demonstrated to replace the. A hybrid configuration of raman amplifier and erbiumdoped fiber amplifier edfa is proposed to obtain a better performance in term of gain, noise figure and flat gain. The primary difference is that they do not have a resonator. Comparison of edfa and bidirectionally pumped raman amplifier. The difference between edfa and raman amplifier slideshare.

Comparison of edfa and raman amplifiers effects on rz and nrz encoding techniques in dwdm optical network with bit rate of 80 gbs. Recently raman amplifiers have started to attract much attention because the noise figure is smaller and it is less expensive than the edfa. White paper applications for distributed raman amplification. Further, though the initial length of pdf is 5 m, the density of praseodymium ion is lower one level 1x10 24 m3 than that of the edfa system. May 25, 2017 raman amplification arising from the excitation of a density echelon in plasma could lead to amplifiers that significantly exceed current power limits of conventional laser media. Calculations and measurements of raman gain coefficients of different fiber types 3 the important parameters to describe the gain of the fra are the raman gain coefficient and raman gain coefficient over effective area, also called effective raman gain, which is the desired parameter in a raman amplifier. Pdf the difference between edfa and raman amplifier. 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. After knowing the basic information of edfa and raman optical amplifiers, you must consider that the raman amplifier performs better for. Discrete lumped raman amplifier ra the amplifier consists of a coil of dedicated fiber together with pumps. Raman amplifiers for telecommunications selected topics.

An optical amplifier may be thought of as a laser without an optical cavity, or one in which feedback from the cavity is suppressed. For example, gain bandwidths of up 100 nm have been demonstrated 9, 10, 2125, and the 100 nm can fall anywhere in the transparency window between. I am confused what is the major difference between two. Distributed raman amplifier dra uses the transmission fiber itself as the medium, into which a backward pump is injected.

Gain flattening of edfa using hybrid edfa raman amplifier w ith reduced channel spacing. For the uninitiated, edfa erbium doped fiber amplifier. Comparison of edfa and raman amplifiers effects on rz and nrz. An optical amplifier pump laser reference design based on. This paper simulated the characteristics of raman amplifier by. Abstractwe numerically compare the performance of a bidi rectionally pumped raman and an erbiumdoped fiber amplifier. A raman amplifier is an optical amplifier based on raman gain, which results from the effect of stimulated raman scattering. In this way, a raman amplifier can be combinedfa booster or inlineed with a n. Raman amplifier for optical amplification we need stimulated raman scattering. Pp ap here are some typical numbers for the raman amp. The better q factor is provided by the raman amplifier 26. Comparison of edfa and raman amplifiers effects on. 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. An optical amplifier pump laser reference design based on the amc7820 rick downs data acquisition products abstract the amc7820 is an integrated circuit designed for analog monitoring and.

An optical signal can be amplified in the optical domain without being converted to electronic domain and back. The aim of this article is to establish a comparison between. Research article noise gain features of fiber raman amplifier georgiis. In the distance range 40120 km, raman and edfa amplifier have. An erbiumdoped fiber amplifier edfa is a device that amplifies an optical fiber signal. 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. Similar to the edfa system, the effects on the output features of the pdfa system is first studied with various length of pdf. The pump laser, in this case, has a wavelength of 1535 nm. Rp photonics encyclopedia raman amplifiers, fiber amplifier. Difference between using optical amplifier and edfa optiwave. To compare performance of the hybrid amplifiers, the eye diagrams of detected signals were analyzed and the.

Comparison of edfa and raman amplifiers effects on rz and. Pdf in this paper, comparative study of the gain and noise figure for edfa raman hybrid. This work demonstrates the simulation of two different types of optical fiber amplifiers ofa utilizing optisystem10, namely, 3 m length of erbium doped fiber amplifier edfa and 7 km length of. The maximum repeaterless transmission distance for the worst case scenario at 25ghz channel.