Doping radius effects on an erbium-doped fiber amplifier
In an erbium-doped fiber amplifier (EDFA), erbium ions act as a three-level system. Therefore, much higher pump energy is required to achieve the population inversion in an erbium-doped fiber (EDF). This higher pump energy requirement complicates the efficient design of an EDFA. However, efficient use of the pump power can improve the EDFA performance. The improved performance of an EDFA can be obtained by reducing the doping radius of the EDF. A smaller doping radius increases pump–dopant interactions and subsequently increases the pump–photon conversion efficiency. Decreasing the doping radius allows a larger proportion of dopant ions, which are concentrated near the core, to interact with the highest pump intensity. However, decreasing the doping radius beyond a certain limit will bring the dopant ions much closer and introduce detrimental ion–ion interaction effects. In this Letter, we show that an optimal doping radius in an EDF can provide the best gain performance. Moreover, we have simulated the well-known numerical aperture effects on EDFA gain performance to support our claim.
基金项目：The authors acknowledge the support from King Fahd University of Petroleum and Minerals (KFUPM), King Abdulaziz City for Science and Technology (KACST) via KACST-TIC in Solid State Lighting (Nos. EE2381 and KACST TIC R2-FP-008).
Khurram Karim Qureshi：Department of Electrical Engineering, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
Md. Mahbub Hossain：Electronics and Communication Engineering Discipline, Khulna University, Khulna 9208, Bangladesh
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Md. Ziaul Amin, Khurram Karim Qureshi, Md. Mahbub Hossain, "Doping radius effects on an erbium-doped fiber amplifier," Chinese Optics Letters 17(1), 010602 (2019)