The erbium doped fiber is pumped with a laser, at a wavelength of 980 nm or 1480 nm and produce. In the last case, there are two levels in the light generation. The first stage consists of large core double cladding fiber pumped by a single fiber pigtailed laser diode bar operating at 976nm. Bruce nyman, gregory cowle, in optically amplified wdm networks, 2011. Erbium rare earth ions are added to the fiber core material as a dopant in typical levels of a few hundred parts per million.
Index terms erbium, erbium doped fiber amplifier, energy level, optical amplifier. An erbiumdoped fiber amplifier edfa is a device that amplifies an optical fiber signal. 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. Figure 2 equivalent to figure 4 b 1 in this second case, the saturation effect of an amplifier is shown using two wavelength multiplexed signals at 1545 nm and 1555 nm. Implementation of three functional devices using erbium. In this paper, initial investigations on a highgain, shortlength phosphate glass erbium ytterbium doped fiber amplifier are presented. Erbium doped fiber amplifier is a optical amplifier, it amplifies weak input optical signals directly without any conversions pumped with a laser diode. The gain and commotion figure at every variety of both length and siphon control are exploratory, reenacted by utilizing matlab programming. Its core is the erbiumdoped optical fiber, which is typically a singlemode fiber.
With product ranges available offering polarization maintaining, bendinsensitive, rareearth doped, claddingpump and. 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. For added safety, the user may connect an interlock. We report on the recent development of multicore fiber amplifiers suitable for amplifying space division multiplexed signals. An erbium amplifier, also called optical amplifier or an erbiumdoped fiber amplifier or edfa, is an optical or ir repeater that amplifies a modulated laser beam directly, without optoelectronic and electrooptical conversion. Eindhoven university of technology master an optical amplifier. Complete analysis of erbiumdoped fiber amplifiers technical paper christian hentschel, edgar leckel. The pump current of the ytterbiumdoped fiber amplifier is adjustable through the instruments front panel, allowing the user to vary the gain and output power of the amplifier. The amplifier cavity contains a length of erbium doped fiber with two narrowband braggmatched fiber grating reflectors. 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. In this video, i have covered erbium dopped fiber amplifier edfa with following outlines. Erbiumdoped fiber an overview sciencedirect topics. Microsecond gainswitched master oscillator power amplifier 1958 nm with high.
Ytterbiumdoped fiber amplifier article pdf available in ieee journal of quantum electronics 337. These are just a handful of the essential questions answered in erbiumdoped fiber amplifiersthe first book to integrate the most influential current papers on this breakthrough in fiberoptics technology. Three possible models or approximations can be used in the erbium doped fiber edf. Erbiumdoped fiber amplifiers are modeled using the propagation and rate equations of a homogeneous twolevel laser medium. Hence, it is named as edfa erbium doped fiber amplifier. Phosphate glass is an attractive material for optical amplifiers, because it exhibits a high solubility for rareearth ions. 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 global market for erbiumdoped fiber amplifier is segmented by geography into regions of north america, south america, europe, the middle east and africa, and asia pacific. Edfa erbium doped fiber amplifier tutorial exfiber optical technologies co.
At least the loss limitation can be partially canceled out by the introduction of optical. These models solve the dynamics of different energy states of erbium ions and optical wave evolution that propagates in active medium. Doped fiber amplifiers dfas are optical amplifiers that use a doped optical fiber as a gain medium to amplify an optical signal. As a consequence, optical amplifiers need to be most. Here we discuss the main features that influence design and possible applications of ytterbiumdoped fiber amplifiers.
Erbiumdoped fiber amplifiers, device and system developments. 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. This invention is a rare earth doped optical amplifier with increased gain and lowered pump thresholds. Following are the merits of erbium doped fiber amplifiers.
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. One approach is to replace the erbium fiber with an erbium. Several numerical models of optical fiber amplifier have been developed. Introduction as it found in the massive literature of photonics, laser and amplifier take an important part in the current. The amplifying scheme is based on a 3 level lasing system rather than the more prevalent 4 level lasing system. In optical communication network, signals travel through fibers for very large distances. Pdf modeling erbiumdoped fiber amplifiers semantic scholar. Design and development of erbium doped fiber amplifiers. 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.
This allows a high concentration of those activeions into a. Fundamental design of a distributed erbiumdoped fiber amplifier for. In terms of revenue, asia pacific is expected to hold a dominant share in the global market in 2016. Lumibird proposes the widest range of highquality cw erbium doped fiber amplifier edfa. A first stage fiber amplifier is seeded with a commercial microlaser producing sub 1ns pulses at 12kpps. 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. 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.
As erbium doped fiber amplifiers became widely accepted there was immediate interest in finding ways to reduce the cost and size of the amplifier. Design and analysis of erbium doped fiber amplifier for. 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. Thorlabs praseodymium doped fiber amplifier pdfa offers high gain 20 db small signal gain, high output power 16 dbm, and a low noise figure amplifier or preamplifier. Erbiumdoped fiber amplifiers are the by far most important fiber amplifiers in the context of longrange optical fiber communications. Author of hps fiber optics handbook, he has been active in the. Optical amplifier usage in preamplification, power amplification, and inline amplification for longhaul systems provides a higher level of performance. Device and system developments brings telecommunications professionals up to date. Erbiumdoped fiber amplifiers is exarnined, and furthermore an account of the. Various types of optical amplifiers have been developed in ofcs to amplify optical signals. When a normal optical fiber core is doped with trivalent erbium ions, erbium doped fiber is formed.
Bibliography includes bibliographical references p. Written by one of the pioneers in the field, this unique reference provides researchers, engineers, and system designers with detailed. Sm erbiumytterbium doped fiber newport corporation. Erbium yterbium doped fiber amplifier 1u eydfa cdata. A typical setup of a simple erbiumdoped fiber amplifier edfa is shown in figure 1. Pdf erbiumdoped fiber amplifier edfa is an optical amplifier used in the c band and lband, where the loss of telecom optical fibers.
Pdf erbiumdoped fiber amplifier edfa is an optical amplifier used in the cband and lband, where the loss of telecom optical fibers. Stability of a 500 km erbiumdoped fiber amplifier cascade dtu orbit. In addition, remote control of the pump current is supported by sending serial commands via a usb 2. 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. Where to buy erbiumdoped fiber amplifiers, edfa, telecom. 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. Keywords erbium doped fiber amplifier, erbium doped fiber laser, lasing, amplification 1. Cw erbium doped fiber amplifier 8 different families. Pdf modeling erbiumdoped fiber amplifiers semantic.
Lumibird developed patented technologies to improve pumping efficiency, reducing, therefore, power consumption and increasing lifetime. Very large mode area ytterbium fiber amplifier with. Erbium yterbium doped fiber amplifier 1u eydfa cdata eydfa series are mainly used in am catv, digital catv, fttx pon,which is a high power multiport output optical fiber amplifier. Edfa erbium doped fiber amplifier physics and radio. Keopsys has designed a particular optical fiber architecture, to avoid nonlinear effects that can damage the ytterbium amplifier. Erbiumdoped fiber optic amplifiers suppliers photonics. Fiber lasers, pm amplifiers edf50 pm 27281 a pm fiber with absorption of 50 dbm at 1530 nm. Erbiumdoped fiber amplifiers have opened the way to transmission systems using soliton pulse propagation and contribute to a significant increase in the sensitivity of receivers. Doped fiber amplifier an overview sciencedirect topics. Erbium dopped fiber amplifier edfa basics, working. Optical amplifiers, edfa, erbium doped fiber, gain, noise figure 1.
Merits of erbiumdoped fiber amplifiers fiber optic. The fiber is highly transparent at the erbium lasing wavelength of two to nine. The fiber has an elliptical core design with high erbium concentration making it attractive for very short fiber use in the laser cavity. These amplifiers operate in demanding thermal, vibration, and radiation environments. Rp photonics encyclopedia erbiumdoped fiber amplifiers. Fiber lasers, pm amplifiers rightwave highly doped erbium edf, ytterbium and thulium doped edf.
A 7core erbium doped doubleclad fiber amplifier with. Along with these gratings, a stg filter with a specified intracavity, loss is included close to the output end to control the intracavity loss and reduce the effect of stray reflections. State of art manoj ramesh rao r, johny richards r, joel manohar, mr. Introduction laser and its derivatives are playing crucial roles in a wide domain of science and technology, due to their ad.
The device uses a short length of optical fiber doped with the rareearth element erbium. 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. The main decision of this paper is to execute erbium doped fiber amplifier edfa in the scope of cband. Introduction erbium doped fiber amplifiers are the by far most important fiber amplifiers in the context of longrange optical fiber communications. The term doping refers to the process of using chemical elements to facilitate results. 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. Buyers guide products erbiumdoped fiber amplifiers.
A twodimensional linear array fiber amplifier based on the mopa configuration l q niu, c x gao, h d he et al. Modeling erbiumdoped fiber amplifiers ieee journals. The dependence of erbiumdoped fiber amplifier edfa performance on the erbium ion concentration is studied experimentally and theoretically. Erbiumdoped fiber optic amplifiers an erbiumdoped fiber optic amplifier is an optical fiber that can be used to amplify an optical input. Highgain shortlength phosphate glass erbiumytterbium. Osa multicore erbium doped fiber amplifiers for space. The erbium fiber has a limit on the coil diameter of about 2 inches to obtain high reliability.
One of the most important factors limiting the transmission. A 7core erbium doped doubleclad fiber amplifier with sidecoupled pumping kazi s. Its spectral bandwidth is in 1540 1563nm,whichis mainly designed for. Doped fiber amplifier gain and gain spectrum gain flattening of edfas noise in.
We designed and constructed 7core amplifiers, where the cores could be pumped individually or simultaneously through the cladding and studied the amplification and noise properties of these amplifiers. It is used in the telecommunications field and in various types of research fields. Fiber amplifiers are used widely in terrestrial telecommunications, and are now finding their way into uav and satellite laser communications. This erbium doped fiber act as a gain medium that amplifies an optical signal. Effects of concentration on the performance of erbiumdoped fiber. Today, they are widely used in all kinds of fiber communication systems, especially wavelength division multiplexed wdm systems 2 3. Additionally, the transmission mode of the optical fiber at the pump wavelength has a radius which is substantially equal to or greater than the radius of the. The first case can be described by a threelevel laser model whereas the second case is a quasithreelevel system.
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