Analytical solution to calculate the smallsignal singlepass gain of a fiber amplifier. Purpose of the experiment understand the principle of operation of the erbiumdoped fiber amplifier edfa. Plot the gain versus pump power for various fiber lengths at a single wavelength 2. Finally, hybrid amplifiers were compared to edfas in a freerunning frequency. When it reaches db, the gain will decrease as the input increases. Several amplification techniques have been developed to provide gain in the sband region such as fluoride based tmdoped fiber amplifiers 123 and raman amplifier 4. Ramanedfa hybrid bidirectional amplifier for fiberoptic time. Because the gain recovery time of a semiconductor amplifier 10 ps to 100 ps timescale is shorter than the repetition period, the gain medium recovers before the next pulse in the pulse train arrives at the semiconductor amplifier. Here, signal input power is fixed at 30 dbm and signal wavelength at 1500 nm. But if the raman amplifier is combined with edfa in any configuration cascaded or parallel, then the large gain flatness can be achieved even with the highest possible gain. Erbium doped fibre amplifiers edfa, featuring high gain over a large bandwidth, low intrinsic losses and long fluorescence times, have emerged over the past decades as key enabling components in wdm. Edfa simulink model for analyzing gain spectrum and ase stephen z. Edfas are comprised of passive optical components, erbiumdoped fiber, and pump lasers. Gain g and noise figure nf measurements collected for the cband edfa as a.
Smallsignal gain is the gain in an amplifier when the signal power launched to the. The signal which is to be amplified and a pump laser are. A comprehensive study on edfa characteristics mdpi. Edfa is an amplifier that is best used because of its low loss and high gain. At present, the hoas are promising and generally utilized innovation for the present rapid broadband applications to upgrade the network system execution without utilizing expensive methods.
J into lband edfa having primary pump 980 nm longwavelength erbiumdoped fiber amplifier gain enhanced by copropagating with signal wavelength 1570 nm ase end reflectors, ieee photon. Join us at the angeltech live iii on 12th april 2021 registration is open and free. Edfa is an optical amplifier that uses a doped optical fiber as a gain medium to amplify an optical signal. Figures 5a and 5b show the largesignal gain and noise figure as functions of wavelength from 1520 nm to 1570 nm at an. The fg edfa can be softwareconfigured as a pre amplifier, booster or inline amplifier, thus allowing a single partnumber to address different network functions. Erbium doped fiber amplifier edfa is an optical amplifier that uses a doped optical fiber as a gain medium to amplify an optical signal. Customised preamplifier edfa for dwdm solution fs australia. Hi guys, i am currently simulating edfa raman amplifier in terms of output gain base on the journal gain flattening of edfa using hybrid edfa raman amplifier with reduced channel spacing. Measuring optimal length of the amplifying fiber in. The gain of these two stages amplifier can be independently set in a certain range.
Erbium doped fiber amplifier edfa has been at the fore front in optical amplification field due to its ability to produce substantial gain under low pumping power plus its versatility in providing amplification in sband 4, 5, cband, and lband 6. Input the light source to the edfa and input the edfa. A figure 1 shows nf gain measurement using the level interpolation method. A method for improving parametric amplifier gain bandwidth is introduced and analyzed. Error free operation has been achieved for all data streams, with an average power penalty of 2. Figure 5 presents 4 surviving channels after the edfa amplifier. The invention is directed to a multistage optical amplifier having a gain stage between a gff and an optical attenuator. Optical amplifieredfa erbiumdoped fiber amplifier for wdm.
Erbium doped fiber amplifier edfa is a high performance, small size of the fiber amplifier products. These amplifiers offer high optical gain, low noise figure and high saturation optical power which are fully integrated with various kinds of dwdm system. Pdf edfa gain optimization for wdm system researchgate. Edfa transient assessment for bursty traffic request pdf. In erbium doped fiber amplifier, for the most part two pump wavelengths are required for work to boost the signal. Cn101174896a method for measuring gain and noise factor of. Typical absorption gain spectrum for erbium doped fiber. Gains of 50 db are achieved with modern amplifiers. Pdf gain characteristic of erbium doped fiber amplifier. Enhancement in the gain of edfa in fiber optic communication. Pumping power variations can further extend the research 3 j.
Doped fiber amplifiers dfas use a doped optical fiber as a gain medium. Design and analysis of variable gain amplifier with erbium doped. Optical ampsraman and erbiumdoped fiber amplifiers pp. China leading provider of edfa optical amplifier and edfa fiber amplifier, shanghai b and a technology co. Fs dwdm edfa erbium doped fiber amplifier booster, 20db gain, dbm output, cband greatly increases optical power for otn networks by amplifying signals. The proposed gainclamped edfa gcedfa has good gain clamping characteristics up to 12. Double pass configuration depressed cladding dc edfa shows gain enhancement of about 12 db to 14 db for pump power more than 100 mw. Three different amplifier types booster, inline amplifier, and pre amplifier can be used depending on the required distance and existing locations. The gain flattening filters provide in line compensation of the spectral gain profile of edfas. The present invention discloses a method for measuring the gain and noise coefficients of the erbiumdoped optical amplifier.
The most practical optical amplifiers to date include the soa and edfa types. In this work, a singlestage cband erbiumdoped fiber amplifier edfa has been constructed and characterized. Com offers dwdm edfa with agc operation mode which ensures constant gain and enables the saturated output power to change with the input power automatically. These products are available in a wide variety of gain configurations targeting different output powers. Pdf gain clamped lband edfa using a fiber bragg grating in two. The edfa was designed to give a gain of approximately 18 db. Pdf an experimental study on sband depressed cladding edfa. Pinter ryerson university department of electrical and computer engineering email protected december, 2003 abstract a simulink model for investigating erbiumdoped fiber amplifier edfa dynamics has been developed by novak and gieske 2002 and reproduced by jiang 2002. Gain flattening of edfa using hybrid edfaraman amplifier w ith. A length of silica fiber, whose core is doped with rare earth element erbium. Pdf an experimental study on sband depressed cladding. My problem is the resulting gain that i get from the hybrid amplifier seems like its not affected by the raman amplifier at all. Variable gainflattened lband erbiumdoped fiber amplifier.
Optimization tool for erbium doped fibre amplifiers. Cn101174896a method for measuring gain and noise factor. Alloptical gainclamped erbiumdoped fiber amplifier with improved. Edfa s are widely used in wavelength division multiplexed systems because as mentioned before, electrical amplification is complex and expensive for multiwavelength systems. For amplifiers saturated by amplified spontaneous emission, it is possible to increase the gain by detuning the pump wavelength. These edfa es are available in both single channel and dwdm configurations. Soon after the early application of edfa, coarsewavelength division multiplexing cwdm was used to boost amplifiers, increasing bandwidth capacity per fiber.
Erbiumdoped fiber an overview sciencedirect topics. Dwdm cband edfa booster, optical amplifier, with automatic power reduction apr,2 slots 20 22. Broadband erbiumdoped fiber amplifier edfa was useful to increase the number of. Introduction t he 980nm pump band is the most efficient for erbium doped fiber amplifiers edfa s. Smallsignal erbiumdoped fibre amplifiers pumped at 980 nm. The gain enhancement is due to the reflected input signal back to the dcedf and amplifies the signal for the second time. Relatively lownoise performance can be achieved with suitable amplifier design, taking into account particularly the erbium. Edfa amplifier archives tutorials of fiber optic products.
More specifically, in accordance with an illustrative embodiment of the present invention, an optical amplifier system comprises multiple gain stages arranged serially for providing gain to an optical signal propagating therein. Pdf enhancement in the gain of edfa in fibre optic. Wdm optical network analysis using edfa and raman amplifier. In edfa, a relatively highpowered beam of light is mixed with the input signal using a wavelength selective coupler. All edfa es are available in bench top, 1u 19 rackmount, gain block or module formats. The internal use of stability high power semiconductor laser, the high stability of wdm, isolator, and high gain. Modeling of gain in edfa and its behavior in c and l band. In deep saturation at high input power, this gain will drop to 10 db or less. Amplificateur optique edfa pdf to download pdf you need. This next generation variable gain amplifier module is composed with two stages amplifier.
Erbiumdoped fiber amplifier edfa is an optical amplifier used in the cband and lband, where the loss of telecom optical fibers becomes lowest in. Pdf in the design of erbium doped fiber amplifier edfa, improving. This type of fiber is called erbiumdoped fiber, and is the key component in amplifying an optical signal in an edfa. Experiment on erbiumdoped fiber amplifiers li qian advanced labs for special topics in photonics ece 1640h university of toronto april 28,1998 1. The amplifier can provide more than db onoff gain on all 32 dwdm channels. Erbium doped fiber erbiumdoped fibre amplifier optical input. Finally, hybrid amplifiers were compared to edfas in a free running frequency. Fiberstore can provide dwdm edfa amplifiers in different channel from 4080 channels.
Pdf the gain flatness of erbiumdoped fiber amplifier edfa is a key device for wavelength division multiplexing. 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. Such amplifiers can have high gain and low noise figure. Pp ap here are some typical numbers for the raman amp. Nagel, multistage erbiumdoped fiber amplifier designs, j. Gain flattening of edfa using hybrid edfaraman amplifier. Raman amplifier gain equations gr is called the raman gain coefficient units of mw.
Amplifiers edfa basic edf amplifier design erbiumdoped fiber amplifier edfa most common commercially available since the early 1990s works best in the range 1530 to 1565 nm gain up to 30 db input 1480 or 980 nm pump laser. At least the loss limitation can be partially canceled out by the introduction of optical. Edfas in certain applications including power amplifiers for free space optical. Mafa 5000 series edfa gain blocks provide input and output optical isolation. The optical input power controls the edfa saturation state and gain. The amplifier performance for different control channel wavelengths and feedback. Erbium doped fiber amplifier 30mw400mw edfa booster amplifier advanced lcd type. Edfa single pass gain calculator file exchange matlab central. Edfa wavelength division multiplexing optical fiber.
Pdf gain clamped lband edfa using a fiber bragg grating. The edfa section of the hybrid amplifier is a standard singlestage 980 nm forwardpumped configuration with a gain flattening filter at the output designed to equalize the combined raman edfa gain shape. Includes standard parameters for erbium or ytterbiumdoped fiber amplifiers. Specification for cband amplifiers features applications. 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. It is shown that it is possible to make chromatic dispersion equal. Another technique is the depressed cladding erbium doped fiber dcedf, which contributes high bending loss in longer wavelength that allows higher amplification in sband region. The same adddrop simulation was done for the gain clamped edfa ring laser. Chapter 7 optical amplifiers wavelength division multiplexing. Usually, more than one optical amplifier in any design is called a hoa. For lower gain levels, the optimum cutoff wavelength is 800 nm. Thanks to noncavity structure of the proposed gc edfa the amplifier is free from relaxation oscillation and has 1db improved no. Assessment of commercial optical amplifiers for potential use in. Amplifiers are equalized over a continuous 73 nm 9 thz bandwidth and operate at 18.
An analysis of edfas used as preamplifiers indicates that significant improvements of the noise. Investigation of broadband sband to lband erbiumdoped fiber. Gain partitioning in a hybrid amplifier is as shown in fig. Edfa erbiumdoped fiber amplifier series wide range of power from 14 dbm to 25. Quantum limited noise figure operation of high gain erbium doped. However, there is a problem with using edfa s in wdm systems because the gain of the edfa is not uniform over the entire 1550 nm window i. In this study, the fluctuant at the output signal gain depending on the input signal power was examined and it is shown that a c band edfa can be used as a flat gain amplifier without a gain. It has high input power, high output power and medium optical gain.
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. Figure 5 shows a number of measurements using the hp 83465a edfa test system on a fitel erfa amplifier. The hoas are the enabling and capable technology for highcapacity dwdm. Islam 10 described the net gain of the hybrid ramanerbium doped fiber amplifier edfa hoa, g hybrid, as the sum of the two individual gains in db of raman and edfa, respectively. The edfa is used to amplify two simultaneous equal wavelengths are located between these fbg wavelengths. The amplifier in this case is called an erbiumdoped fiber amplifier. Erbiumdoped fiber amplifier edfa is an optical amplifier used in the cband and lband. The common types are 20dbm output cband 40 channels 26db gain booster edfa, 16dbm output cband 40 channels 14db gain booster edfa and so on.
There is a connector between the two stages amplifier, which used for midstage access, such as. Community forums what is different in edfa diffrent. In this paper, a new design for an alloptical gain clamped lband edfa is presented using a twostage configuration with a fiber bragg grating fbg. Gain flattening filter for edfa acps gain flattening filters for erbriundroped fiber amplifiers edfas are based on thinfilm filter technology and metal bonding microoptics packaging. The gain of an erbium doped fiber amplifier was measured more than 30db over a signal wavelength ranges from 1. High power transfer efficiency from pump to signal power 50%. Edfa, erbium, optical amplifier, pon, rare earths, thermal. Design and analysis of variable gain amplifier with erbium. An optical amplifier is a device that amplifies an optical signal directly, without the need to first.
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