A comparative perspective on Differential Modal Gain reduction techniques for optimized few mode EDFA systems

Qayoom, Taban; Qazi, Gausia; Hakim, Najeeb-ud-din

doi:10.1016/j.ijleo.2021.166285

Cited by 2 publications

(1 citation statement)

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“…In 2017, D. Vigneswaran et al proposed the mode-selective bidirectional pumping scheme for the uniform gain pattern for different LP modes with the minimal DMG close to 0 dB [10]. In 2021, Qayoom Taban et al used the center-depressed erbium-ion doping profile to improve the pumping efficiency of the FM-EDFA supporting six mode groups, with the LP 21a -mode pump power of 55.567 mW and the minimum DMG of approximately 4.41 dB [11]. It is well-known that the DMG can be reduced by optimizing pump modes, refractive index profile, and erbium-doping concentration, or combining the above methods, in which the erbium-ion concentration distribution is the basis of optimizing the pumping scheme and the FM-EDF's length in the simulation or design of FM-EDFAs.…”

Section: Introductionmentioning

confidence: 99%

Experimental Measurement of Absorption Coefficients for Effective Erbium-Doping Concentration to Optimize Few-Mode Erbium-Doped Fiber Amplifiers with Low Differential Mode Gain

Jiang

et al. 2021

Photonics

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According to the analytical expression for modal gain of few-mode erbium-doped fiber amplifiers (FM-EDFAs), we propose a method of measuring the absorption loss coefficients of few-mode signals in few-mode erbium-doped fibers (FM-EDFs) by extrapolating the mode–gain curve dependent on the average population inversion. The absorption loss coefficient of an FM-EDF was measured in our experimental platform and used to estimate the effective erbium-ion doping concentration. The feasibility of the extrapolation method was verified by simulation and comparison with the transmission method. Furthermore, the FM-EDFAs with high modal gain and low differential mode gain (DMG) could be optimized by adjusting the FM-EDF’s length and pump power. The analysis process presented here is very useful for the efficient design of FM-EDFAs from a practical point of view.

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Section: Introductionmentioning

confidence: 99%