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.

© 2018 IEEE

Impact of the heat load on the laser performance of chirally-coupled-core fibers

Shicheng Zhu, Jinyan Li, Li Li, Kexiong Sun, Chang Hu, Xinyu Shao, and Xiuquan Ma
Opt. Express 27(26) 37522-37531 (2019)

Static and dynamic mode instabilities in dual-core fiber amplifiers

Jesper Lægsgaard, Federica Poli, Annamaria Cucinotta, and Stefano Selleri
J. Opt. Soc. Am. B 36(3) 757-767 (2019)

Thermal modeling of gain competition in Yb-doped large-mode-area photonic-crystal fiber amplifier

Lorenzo Rosa, Enrico Coscelli, Federica Poli, Annamaria Cucinotta, and Stefano Selleri
Opt. Express 23(14) 18638-18644 (2015)

Thermally induced mode loss evolution in the coiled ytterbium doped large mode area fiber

Lingchao Kong, Jinyong Leng, Pu Zhou, and Zongfu Jiang
Opt. Express 25(19) 23437-23450 (2017)

Spatially resolved modal spectroscopy of Er:Yb doped multifilament-core fiber amplifier

Julien Le Gouët, Julien Delaporte, Laurent Lombard, and Guillaume Canat
Opt. Express 20(5) 5566-5575 (2012)