Gain equalized four mode groups erbium doped fiber amplifier with lp01 pump zhenzhen zhang,1 qi mo,2 cheng guo,1 ningbo zhao,1 cheng du, 2 xiaoying li,1 1college of precision instrument and opto-electronics engineering, tianjin university, key laboratory of optoelectronics information technology. Adaptive modal gain equalization techniques in multi-mode erbium-doped fiber amplifiers abstract: we demonstrate two adaptive methods to equalize mode-dependent gain (mdg) in multi-mode erbium-doped fiber amplifiers (mm- edfas) the first method uses a spatial light modulator (slm) in line with the amplifier. Abstract: we report design of an inherently gain flattened edfa based on an asymmetric twin-core fiber for operation in the c-band one of the cores is doped with erbium, while the other core is un-doped the proposed design shows a glass as host , use of gain equalizing filters (gef) such as the mach-zehnder. There are several different physical mechanisms that can be used to amplify a light signal, which correspond to the major types of optical amplifiers in doped fiber amplifiers and bulk lasers, stimulated emission in the amplifier's gain medium causes amplification of incoming light in semiconductor optical amplifiers (soas),. Amplifier, obtaining a curve with approximately 3 db of ripple, from 1524 nm to 1551 nm, using long-period fibre gratings as equalising optical filters the fabrication principle of the long-period fibre grating is based on the electric arc technique 1 introduction the gain flattening of erbium-doped fibre amplifiers ( edfa) has. Erbium-doped fiber amplifiers are the by far most important fiber amplifiers in the context of long-range optical fiber communications they can efficiently amplify light in a good flatness of the gain in a wide wavelength region (→ gain equalization), as required eg for wavelength division multiplexing (see below), can be. Erbium doped fiber amplifier in the doped optical fiber these energy states are modified by the local electric field other doped elements for optical fibers can increase or decrease the variations from the electric field in the followings, using the eq (3), we have obtained, with a good precision, the absorption.
Gain equalization means achieving identical gain flattening means achieving ( wdm) technology employing erbium effective alternative for increasing network capac provide a flat gain spectrum, independent of inp fiber amplifiers indeed, the edfa ning filter (gff), erbium doped fiber amplifier (edfa) spontaneous. The erbium doped fiber amplifier (edfa) is an important factor in the improvement of the performance of optical fiber transmission systems another type of promising solutions using intelligent optical amplifiers for automatically equalizing gain spectrum are under development and have not been fully tested in practice. The gain flatness of an l-band erbium-doped fiber amplifier (edfa) is still an open issue we improve the conventional keywords: erbium-doped fiber amplifier l-band flatness gain-clamped effect paper 141988p received from eq (1), it is clear that n is negatively propor- tional to the product of r1. Abstract to sum up the advantages and counterbalance the drawbacks of various optical amplifier types, a hybrid amplifier can be made here a combination of two most popular and frequently used amplifiers ie edfa-rfa ie erbium doped fiber amplifier altogether with raman fiber amplifier has been used to.
Depends on the ability to fabricate devices like inline amplifiers and optical switches in fmf ,  in few-mode erbium- doped fiber amplifiers (fm-edfa), gain equalization is of paramount importance it has been proposed that controlling the mode content of the pump enables control of mode- dependent gain (mdg) [3. This article introduces optical amplification technologies that make it possible to construct a multi-core erbium-doped fiber amplifier (edfa) and a few-mode edfa for cladding pumping has the potential to achieve both low power consumption and downsizing by using an uncooled multi-mode pump laser diode (ld.
For the first time, we demonstrate the implementation of a core pumped few mode erbium amplifier utilizing a mode selective photonic routing, switching and active elements such as fm raman amplifiers or few modes er3+ doped fiber amplifiers (fm-edfas)  gain equalization is critical to the overall performance of. An efficient gain-flattened c-band erbium-doped fibre amplifier is demonstrated using a double-pass configuration with an isogaintm erbium-doped fibre (edf) the amplifier utilizes a double-propagation of signal provided by an optical circulator at the output end of the edf to obtain an improved flat-gain characteristic.
Posed to broaden and flatten the gain bandwidth one approach is to add a,o, and p,o, to erbium-doped silica glass fibre [l, 21 fluoride-based edfas have been shown to have better character- istics than silica-based edfas in wdm applications  another approach is to use a gain equalising optical filter such as the. Erbium-doped fiber amplifiers (edfas) are the vital components optical fiber amplifiers are gain, noise, bandwidth, and gain spectrum fiber filters  are used to equalize the amplifier gain spectrum also, all reflection mirrors (arms) or fiber reflection mirrors (frms) are used in double-pass structures to enhance the. Edfa is basically a short length of fibre whose core is doped with erbium this erbium atom when in metastable state is relatively longer life time (about 10ms) edfa is constructed from fusion splicing discrete fiber pigtailed components the whole system consists of erbium doped fiber, wdm coupler & pump light source &. Hence, decreasing dmg to achieve mode equalization of optical gain is an important task in the design of medfas to do so, several approaches can be combined or used independently: controlling the pump modal contents  tailoring the erbium spatial distribution in the erbium-doped fiber (edf) [13–15] constructing.
Based on erbium doped fiber (edf) is proposed and demonstrated by fabricating and writing two series ultra-long period keywords: amplified spontaneous emission (ase) source erbium-doped fiber amplifier (edfa) gain flattening filter long-period techniques for equalization the lpfg promotes. Edfa—erbium-doped fiber amplifier gef—gain equalization filter itu— international telecommunication union monet—multiwavelength optical networking mux—multiplexing/multiplexer osnr—optical signal-to-noise ratio wad—wavelength add/drop wdm—wavelength division multiplexing 4ι15/2 4ι13/2 4ι11/2.
The terms gain equalization and gain flattening come from the fiberoptic telecommunications field, where erbium-doped fibers are used to amplify the light traveling through the fiber these amplifiers have a wavelength-dependent gain ie, some wavelengths are amplified more than others a gain-flattening filter restores. Amplifiers and, in particular, the bandwidth broadening of edfas (erbium doped fiber amplifier) in this technology area, gain-equalizing technology has been developed to flatten the gain peaks around 1532 nm, making available a wide range of wavelengths from 1530 to 1560 nm furthermore, development of gain- shift. We investigate gain equalization of a four-mode-group and six-mode-group erbium-doped fiber amplifiers with a genetic algorithm for mode division multiplexing transmission systems by optimizing rare earth dopant profile and pump modes powers, respectively the optimizing gains are calculated to be. Wg4 2:15pm dynamic gain equalization of erbium-doped fiber amplifier with all- fiber acoustwptic tunable filters hyo sang kim, seok hyun yun, hyang kyun kim , namkyoo park, byoung yoon kim, department of fhysics korea advanced lnstitute of science and technology, 373-1 kusong-dong, yusong-gu, taejon.