Finisars 70x90 mm fixed gain fg edfa product line supports a full range of c or lband fixed gain wdm edfas, as well as narrow band, cwdm and single channel edfas. The ap3370 edfa module could be combined with ap3314 power meter modules in the platform. Flattening filter, the variable gain ranges from 15db to 25db within wide input power range. High power edfa, 1550nm cband turnkey polarization maintaining high gain amplifier 1 watt and 10 watt models available polarization maintaining fiber nonpm model also available user control of current level to internal pump laser diodes includes loss of input power detection with pump shutdown safety features. They enable the characterization of the gain, noise figure, and output power under unsaturated and saturated signal input regime.
The signal to be amplified and a pump laser are multiplexed into a. Pdf edfa gain optimization for wdm system researchgate. Gain and noise figure performance of erbiumdoped fiber amplifiers. Various technical details the most common pump wavelength for edfas is around 980 nm. The development of erbiumdoped fiber amplifiers edfa in the latter half of the 1990s supported amplification of signals using wavelengthdivision multiplexing wdm and permitted the spread of longdistance, large capacity communications, such as optical submarine cables and optical subscriber systems. The emcore mafa 5000 series micro erbium doped fiber amplifier.
The next time you need, linear video or multiscreen, mpeg, docsis or xphy tm, ip or rf resources to support the operation of multivendor, multitechnology products deployed in your hfc or fttx network, mhz can help. Edfa erbiumdoped fiber amplifier edfa is the most widely used fiberoptic amplifiers, mainly made of erbiumdoped fiber edf, pump light source, optical couplers, optical isolators, optical filters and other components. A figure 1 shows nf gain measurement using the level interpolation method. 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. Input the light source to the edfa and input the edfa. The high density hd erbium doped fiber amplifier edfa is designed to fit into a prisma xd chassis or a standard full height prisma ii chassis with the use of a host module. It acts basically as a sort of a lasing chamber without the mirrors, so it amplifies laser signals as they go through the usually single mode. Consequently, the tunable laser is the most important test equipment in optical amplifier edfa testing, in particular because these amplifiers are the key elements in wdm systems. This makes the module suitable for preamplifier, inline, and booster applications. For the uninitiated, edfa erbium doped fiber amplifier. The optimum length of edfa is 7m and use forward pumping configuration for reduce effect o f noise. Edfas consist of optical couplers to combine pump and signal lights injected to active fiber, unidirectional.
Up to two hd edfa modules can be populated into a host module which requires a single service slot in the prisma ii chassis. The internal use of stability high power semiconductor laser, the high stability of wdm, isolator, and high gain erbiumdoped fiber. Optical amplifiers, edfa, erbium doped fiber, gain, noise figure. A dynamic multiwavelength simulink model for edfa conference paper pdf available in canadian conference on electrical and computer engineering 4. Why in saturated gain region gain is lower than in unsaturated small signal gain region. Ultrafast automatic gain controlled optical fiber amplifier. In a multichannel wdm amplifier, a gain flattening filter gff is usually placed following the output isolator in order to flatten the gain spectrum, as shown in. Design and development of erbium doped fiber amplifiers. The gain provided by the pre amplifier and booster amplifier might not be enough due to the optical loss caused by long haul transmission. Pdf single stage cband erbiumdoped fiber amplifier edfa. Therefore, efficient amplifier control techniques are required to suppress such transients. Benjamin corning photonic technologies, corning incorporated, spzv00, corning, new york, usa,14831 l.
Optical amplifiers venkat venkataramanan instute for opcal. A four stage erbium doped amplifier circuit is implemented. Edfa amplifier archives tutorials of fiber optic products. Amplifier gain leveling with a filter centered at 1531 nm the results of this lesson demonstrated a qualitative agreement with the results obtained by giles and desurvire in 1, considered to be one of the most important references in the edfa modeling. Gain flattening of edfa using hybrid edfaraman amplifier w. The edfa provides a high output power, requiring fewer amplifiers in a given system design. An erbium doped fiber amplifier edfa consists of a piece of fiber of length l, whose core is uniformly doped with erbium ions. Pdf gain and noise figure performance of erbium doped fiber. We report large pumpmediated inhomogeneity in an lband phosphosilicatebased edfa, pumped in the.
Frequency response amplifiers do not have the same gain at all frequencies. Pdf gain and noise figure performance of erbium doped. Gain spectrum and bandwidth, gain saturation, and amplifier noise. Edfa theory in this section, the rate and propagation equations characterizing an edfa operating in c band and pumped at 1480 nm are given. The optical input power controls the edfa saturation state and. Wdm and eon transport networks to ensure the required connection qot level at the receivers. The products support either cooled or uncooled pumps, thus allowing the optimal combination of size, power consumption and performance to be achieved for each application. The most common example is the erbium doped fiber amplifier edfa, where the.
Machine learning assisted edfa gain ripple modelling. Jan 27, 2009 can you provide a pointer to information about the edfa you are using, and be more specific about the power levels you want to run at. In the agc mode the amplifier gain is kept constant, whereas in apc mode the amplifier output power is kept constant. Edfa education kit manual page 2 of 26 generated by stimulated emission.
Rasmussen abstruct comprehensive theoretical analysis on the design of a distributed erbium doped fiber amplifier for longdistance. Jan, 2019 an optical amplifier is a device that amplifies an optical signal directly, without the need to first the most common example is the erbium doped fiber amplifier edfa, where the core of a silica the amplification window of an optical amplifier is the range of optical wavelengths for which the amplifier yields a usable gain. The addition of gain equalization filters can increase the band to more than 25 nm. A gain flattened version and a pre amplifier version for a lower input power 30 dbm, are also available. Cisco prisma ii hd edfa optical amplifier from mhz. A figure 1 shows nfgain measurement using the level interpolation method. An erbium doped fiber amplifier with automatic gain control was designed using the alloptical gain control technique. Advanced optical components erbiumdoped fiber amplifier. The pump current of the erbiumdoped fiber amplifier is adjustable through the instruments front panel, allowing the user to vary the gain and output power of the amplifier. Gain spectrum, gain saturation, and amplifier noise.
These lband edfa instruments are erbium doped fiber amplifiers edfa which offer excellent power stability and high output power. The amplifier consists of an erbium doped fiber amplifier and a discrete raman amplifier, which has isolated raman fibers pumped simultaneously at two, three wavelengths. Gain and noise figure analysis of erbium doped fiber. The gain provided by the preamplifier and booster amplifier might not be enough due to the optical loss caused by long haul transmission. Erbium doped fiber amplifier 30mw400mw edfa booster. Erbium doped fiber amplifier 30mw400mw edfa booster amplifier advanced lcd type. Erbium doped fiber amplifier edfa is a high performance, small size of the fiber amplifier products. Dwdm cband edfa booster, optical amplifier, with automatic power reduction apr,2 slots 20 22. Pdf in this work, a singlestage cband erbiumdoped fiber amplifier edfa has been constructed and characterized. Edfa gain block module is an ideal building block for oem systems integration where there is a requirement to amplify a 1550 nm signal for a broad range of applications including catv systems, rfmicrowave fiber optic links, sensing and control systems, and more. A good flatness of the gain in a wide wavelength region gain equalization, as required e. The signal to be amplified and a pump laser are multiplexed into a doped fiber and the signal is amplified.
The most basic edfa design amplifiers light over a fairly narrow band. Pdf erbiumdoped fiber amplifier edfa is an optical amplifier used in the cband and lband, where the loss of telecom optical fibers becomes lowest. The pumping at 980 nm provides lower noise figure than pumping at 1480 nm. A metastable energy level at 4i2, with a long decay time 10 ms, is essential for collecting ions for a population inversion. The gain of an amplifier is governed, not only by the components transistors etc. Two bands have developed in the third transmission window the conventional, or cband, from approximately 1525 nm 1565 nm, and the long, or lband, from. An edfa is typically operated in one of two operating modes. Edfas can be pumped at 980 nm or 1480 nm, and with different configurations.
The fg edfa can be softwareconfigured as a pre amplifier, booster or inline amplifier, thus allowing a single partnumber to address different network functions. The next time you need, linear video or multiscreen, mpeg, docsis or xphy tm, ip or rf resources to support the operation of multivendor, multitechnology products deployed in your hfc or fttx network, mhz can help choose from a customized package of remote fractional engineering hours you can use over an extended. Inline amplifier is installed in the fiber optic link every 80100km as shown in the following. The structure of a typical edfa is shown in figure 1. Introduction to optical amplifier types and applications ebi d d fib lifi edfa erbiumdoped fiber amplifier edfa external pumping and amplifier gain powerconversion efficiency and gain profile. The internal use of stability high power semiconductor laser, the high stability of. 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. Rapid changes in the input power level to the edfa cause dynamic gain transients, which degrade transmission quality. Edfa gain and signal output power are usually measured as a function of wavelength and input signal. 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.
Its core is the erbiumdoped optical fiber, which is typically a singlemode fiber. Thorlabs corepumped erbiumdoped fiber amplifiers edfas offer 20 dbm 100 mw output power with a low noise figure of medfa c1 functional description the optics of the map series edfa module consists of an erbiumdoped fiber amplifier edfa gain stage with supporting optical components specifically designed to achieve maximum output power at the bulkhead mounted optical connector while maximizing inputoutput isolation. The fg edfa can be softwareconfigured as a preamplifier, booster or inline amplifier, thus allowing a single partnumber to address different network functions. Therefore pre amplifier version of edfa chooses 980 nm for pumping wavelength. 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. Gain analysis of edf amplifier based wdm system using. Fiber amplifier edfa optical output power and module configuration see note 1. A booster amplifier usually provides low gain and high output power.
The erbiumdoped fiber amplifier edfa is the most deployed fiber amplifier as its amplification window coincides with the third transmission window of silicabased optical fiber. 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. A typical setup of a simple erbiumdoped fiber amplifier edfa is shown in figure 1. White paper introduction to edfa technology optical. Fundamental design of a distributed erbiumdoped fiber amplifier for. Pdf a dynamic multiwavelength simulink model for edfa. Related threads on gain saturation in edfa amplifiers saturated bjt and amplifier. Finisars 70x90 mm fixed gain fg edfa product line supports a full range of c or l.
However the amplifier factorg decreases much faster than the gain coefficientg. In steady state, dn2 dt 0, the ratio of level 1 and level 2 population to the total population can be written as. The difference depends on the amplifier gain characteristics. Erbium doped fiber amplifier edfa is a optical amplifier that uses a fiber which has been lightly doped with rare earth ion i. At least the loss limitation can be partially canceled out by the introduction of optical ampli. Rp photonics encyclopedia erbiumdoped fiber amplifiers. This type of fiber is called erbiumdoped fiber, and is the key component in amplifying an optical signal in an edfa. The simulation of edfa requires the simultaneous calculation of the rate equations, which define. A gainflattened version and a preamplifier version for a lower input power 30 dbm, are also available. Erbium doped fiber amplifiers edfas are key devices in. Gain and noise figure performance of erbium doped fiber amplifiers edfa a. In order to suppress the gain transient in a short time. Fiber amplifier edfa optical output power and module configuration. At least the loss limitation can be partially canceled out by the introduction of optical.
In addition, remote control of the pump current is supported by sending serial commands via a usb 2. These products are available in a wide variety of gain configurations targeting different output powers. Automatic gain control agc, or automatic power control apc. Thanks to the amplification settings, the power meters permit an active power control to. Gain and noise figure performance of erbium doped fiber amplifiers edfa article pdf available january 2011 with 2,765 reads how we measure reads. Our products achieve gain deviation gain inhomogeneity in lband phosphosilicatebased erbiumdoped fiber amplifiers li qian1, davide fortusini and s. Such ions can be thought of as simple twolevel systems, i. Thanks to the amplification settings, the power meters permit an active power control to keep output power constant. It is uses this doped optical fiber as a gain medium to amplify an optical signal. Edfas avoid most active components because photons amplify the signal. These affordable turnkey benchtop instruments allow users to view and control pump power individually as well as view the overall power from the.
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