Thermal Effects on Modal Properties of Dual-Core Yb-Doped Fibers

Federica Poli; Jesper Laegsgaard; Annamaria Cucinotta; Stefano Selleri

doi:10.1109/JLT.2018.2886047

Thermal Effects on Modal Properties of Dual-Core Yb-Doped Fibers

Federica Poli^*, Jesper Laegsgaard, Annamaria Cucinotta, Stefano Selleri

^*Corresponding author for this work

University of Parma

Research output: Contribution to journal › Journal article › Research › peer-review

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Abstract

The impact of thermo-optic refractive-index changes arising from the core heat load in a dual-core fiber amplifier is studied through finite-element based numerical simulations. Trends in coupling lengths, effective area, core overlaps of fundamental and higher-order supermodes, effects of asymmetric heat loads, and thermo-optic mode coupling parameters are quantified. It is concluded that the coupling between cores is only moderately altered by the overall heat load, but can be strongly sensitive to asymmetric loads. The influence of the core coupling strength is demonstrated to be very important on the supermode effective area, besides the shrinking due to thermal effects. While the thermo-optic index perturbations can lead to guidance of higher-order supermodes, it seems realistic to maintain single-mode operation through gain suppression of the higher-order modes. On the other hand, thermo-optic couplings between fundamental supermodes are found to be quite strong.

Original language	English
Journal	Journal of Lightwave Technology
Volume	37
Issue number	4
Pages (from-to)	1075 - 1083
ISSN	0733-8724
DOIs	https://doi.org/10.1109/JLT.2018.2886047
Publication status	Published - 1 Jan 2018

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title = "Thermal Effects on Modal Properties of Dual-Core Yb-Doped Fibers",

abstract = "The impact of thermo-optic refractive-index changes arising from the core heat load in a dual-core fiber amplifier is studied through finite-element based numerical simulations. Trends in coupling lengths, effective area, core overlaps of fundamental and higher-order supermodes, effects of asymmetric heat loads, and thermo-optic mode coupling parameters are quantified. It is concluded that the coupling between cores is only moderately altered by the overall heat load, but can be strongly sensitive to asymmetric loads. The influence of the core coupling strength is demonstrated to be very important on the supermode effective area, besides the shrinking due to thermal effects. While the thermo-optic index perturbations can lead to guidance of higher-order supermodes, it seems realistic to maintain single-mode operation through gain suppression of the higher-order modes. On the other hand, thermo-optic couplings between fundamental supermodes are found to be quite strong.",

author = "Federica Poli and Jesper Laegsgaard and Annamaria Cucinotta and Stefano Selleri",

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T1 - Thermal Effects on Modal Properties of Dual-Core Yb-Doped Fibers

AU - Poli, Federica

AU - Laegsgaard, Jesper

AU - Cucinotta, Annamaria

AU - Selleri, Stefano

PY - 2018/1/1

Y1 - 2018/1/1

N2 - The impact of thermo-optic refractive-index changes arising from the core heat load in a dual-core fiber amplifier is studied through finite-element based numerical simulations. Trends in coupling lengths, effective area, core overlaps of fundamental and higher-order supermodes, effects of asymmetric heat loads, and thermo-optic mode coupling parameters are quantified. It is concluded that the coupling between cores is only moderately altered by the overall heat load, but can be strongly sensitive to asymmetric loads. The influence of the core coupling strength is demonstrated to be very important on the supermode effective area, besides the shrinking due to thermal effects. While the thermo-optic index perturbations can lead to guidance of higher-order supermodes, it seems realistic to maintain single-mode operation through gain suppression of the higher-order modes. On the other hand, thermo-optic couplings between fundamental supermodes are found to be quite strong.

AB - The impact of thermo-optic refractive-index changes arising from the core heat load in a dual-core fiber amplifier is studied through finite-element based numerical simulations. Trends in coupling lengths, effective area, core overlaps of fundamental and higher-order supermodes, effects of asymmetric heat loads, and thermo-optic mode coupling parameters are quantified. It is concluded that the coupling between cores is only moderately altered by the overall heat load, but can be strongly sensitive to asymmetric loads. The influence of the core coupling strength is demonstrated to be very important on the supermode effective area, besides the shrinking due to thermal effects. While the thermo-optic index perturbations can lead to guidance of higher-order supermodes, it seems realistic to maintain single-mode operation through gain suppression of the higher-order modes. On the other hand, thermo-optic couplings between fundamental supermodes are found to be quite strong.

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DO - 10.1109/JLT.2018.2886047

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Thermal Effects on Modal Properties of Dual-Core Yb-Doped Fibers

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