Gain equalization of erbium doped fibre

Twincore erbium-doped fibre amplifier with passive spectral gain equalisation april 1993 electronics letters automatic spectral gain equalisation is demonstrated using controlled spatial hole. Abstract mingthis thesis is about the gain equalization of erbium doped fibre amplifiers (edfa), which is a key technology for enabling wavelength-division multiplexed (wdm) optical communication systems. A partial double-pass s-band erbium-doped fibre amplifier sulaiman wadi harun, nor kamilah saat gain-equalization can be achieved [4] in fact, a shorter length of erbium-doped fiber is required for efficient l-band amplification in double-pass amplifier structure [5] besides having advantage of gain. A typical setup of a simple erbium-doped fiber amplifier (edfa) is shown in figure 1 its core is the erbium-doped optical fiber, which is typically a single-mode fiberin 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 (co-directional and counter-directional pumping.

Optical filters for fibre lasers and amplifiers g rego1,2,3, m melo1, it is well known that one of the most used optical fibre for achieving gain is the erbium doped fibre above, as well as in the gain equalization of amplifiers 3 edfa gain flattening. The addition of gain equalization filters can increase the band to more than 25 nm other exotic doped fibers increase the amplification band to 40 nm or more furthermore, data rate independence in edfas means a system upgrade requires changing only the launch and receive terminals. This paper presents a new enhanced design of fibre bragg grating for flattening the gain profile of an erbium-doped fibre amplifier in transmission configuration this grating has modulation of refractive index change and constant chirp rate, wherein both profiles of the parameters are properly. The fibre has two cores, one doped with erbium and the other undoped the feature of this amplifier is its simplicity: only a length of dual core fibre there is no need for gain-equalization.

K fouli, m s thesis ii abstract the gain of an edfa (erbium doped fibre amplifier) is in general wavelength-dependent, leading to different amplification levels among wdm (wavelength division multiplexing) channels. We show experimental performance comparison of different equalization methods in erbium-doped optical amplifiers based on silica and zblan host materials. Positions, is proposed for flattening the gain spectrum of an erbium-doped fibre amplifier a ‘multiwavelength fiber-amplifier cascades with equalization employing mach-zehnder optical filter’, ieee photonics technol lett, 1995, 7, pp 1501-1503.

An l-band erbium-doped fibre amplifier consisting of a length of dual-core fibre is reported it has a flat gain from 1565 to 1615 nm with a maximum gain variation of 06 db, and noise figure less than 39 db. Gain equalization is a technique for making the gain spectrum of an optical amplifier device flatter over a certain optical frequency range this is used for telecom amplifiers, for example. Topics include modeling optical amplification in erbium-doped fibers, noise in edfas, characteristics of erbium-doped fibers, gain saturation, gain clamping, gain equalization, design considerations for c-band and l-band amplification, polarization-dependent effects in edfa, and transient gain dynamics. The erbium-doped fiber amplifier is characterized by its high gain efficiency of several db of gain per mw of pump power in addition, this is obtained in amplifiers that are only tens of meters long. Edfa gain control methods prateeksha sharma1#,bipan kaushal2#,shrija jain3 #e&ec department, pec university (gain equalization filter) they are used to reduce the gain equalisation is realised by inserting tapered long period gratings within the erbium doped fibre core we can also use fiber bragg grating (as shown in fig 3) fig 3(a.

Home archived optical amplifiers in fiber optic communication systems in the case of fiber amplifiers, especially the edfa (erbium doped fiber amplifier) and the ra (raman amplifier), however, the situation was quite different other approaches use gain equalization via controllable attenuators or inverse filtering. Flattening the gain spectrum of an erbium-doped fibre amplifier by connecting an er 3+-doped sio 2-al 2 o 3 fibre and an er 3+-doped multicomponent fibre access full text. Adding gain equalization filters can increase the band to more than 25 nm other exotic doped fibers increase the amplification band to 40 nm because edfas greatly enhance system performance, they find use in long-haul, high data rate fiber optic communication systems and catv delivery systems. The gain flattening of erbium – doped fiber amplifiers (edfa) has been a research issue in recent years with the uniformity of gain involves two aspects, gain equalization and gain flattening gain equalization means achieving identical doped fibre length and pump power of gain-flattened edfas, electronics letters, vol 32, pp 2161.

Gain equalization of erbium doped fibre

gain equalization of erbium doped fibre 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 pump beam to control the modal powers in the pump the second method uses an slm immediately after the mm-edfa to directly control the modal powers in the signal.

The most common example is the erbium doped fibre amplifier (edfa), where the core of a silica fibre is doped with trivalent erbium ions and can be efficiently pumped with a laser at a wavelength of 980 nm or 1,480 nm, and exhibits gain in the 1,550 nm region. Broadband and gain-flattened erbium-doped fiber amplifiers are being widely developed to meet the requirements posed by wavelength-division-multiplexed transmission systems/networks pursuing the ultimate capacity one approach is the improvement of erbium-doped fiber itself for broader gain. The present invention relates to a method and devices that make use of transmission edge filters based on apodized linearly chirped (lc) fiber bragg gratings (fbgs) to provide the variable attenuation required for power equalization among different wavelength channels in an erbium-doped fiber amplifier. (ijccie) vol 1, issue 1 (2014) issn 2349-1469 eissn 2349-1477 uncluttered gain roll out in erbium doped fiber amplifier mariya garba mustapha, mohammed ajiya, and dahiru sani shuaibu uniformity of gain involves two aspects, gain equalization and abstract— the gain flattening of erbium – doped fiber gain flattening.

Automatic spectral gain equalisation is demonstrated using controlled spatial hole-burning in an erbium-doped twincore fibre gain equalisation rates up to 011 db difference between input signal levels are demonstrated and should increase the useful bandwidth of cascaded amplifiers. Differential modal gain (dmg) between all the supported spatial modes [12] gain equalization is critical to the overall performance of the sdm transmission system as high dmg results in system outrage. The sample file edfa basic conceptsosd shows the basic characterization of the erbium doped fiber amplifier (edfa) there are three design layouts: gain spectrum, gain saturation, and amplifier noisethey enable the characterization of the gain, noise figure, and output power under unsaturated and saturated signal input regime. Erbium-doped fiber laser er-doped fiber lasers (edfls) can be viewed as edfas operating in the particular regime where coherent oscillation of ase occurs due to some feedback means a standard definition could be the following: edfls are used as sources for coherent light signal generation, while edfas are used as wave-wave amplifiers for.

Read gain equalization methods in erbium‐doped fiber amplifiers, microwave and optical technology letters on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Summary form only given one of the major problems facing multiwavelength-division-multiplex (wdm) lightwave systems with erbium-doped fiber amplifier (edfa) cascades is gain-equalization.

gain equalization of erbium doped fibre 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 pump beam to control the modal powers in the pump the second method uses an slm immediately after the mm-edfa to directly control the modal powers in the signal.
Gain equalization of erbium doped fibre
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