On thermal distribution in optical fibers with active core

Martin Grábner; Pavel Peterka; Pavel Honzátko

doi:10.1117/12.2592921

18 April 2021 On thermal distribution in optical fibers with active core

Martin Grábner, Pavel Peterka, Pavel Honzátko

Author Affiliations +

Proceedings Volume 11773, Micro-structured and Specialty Optical Fibres VII; 117731C (2021) https://doi.org/10.1117/12.2592921
Event: SPIE Optics + Optoelectronics, 2021, Online Only

Conference Poster

Abstract

The high power optical fibers with a doped active core are subject to heating due to non-radiative absorption of pumping power in the core area. The heat generated in the central part of a fiber is conducted to its outer parts resulting in temperature distribution on the fiber cross section. Efficient cooling is needed in order to avoid thermal damage of the fiber, in particular on the boundary between silica cladding and fiber coating. Temperature distribution in the fiber and its surrounding can be estimated by solving a steady-state heat conduction problem in a domain of fiber cross-section characterized by different values of thermal conductivity of different materials present. In this work, the problem is solved numerically by a finite element method for several kinds of fiber cross sections including a fiber with an octagonal cladding structure. It is shown that the temperature on the critical boundary cladding-coating is increasing linearly with the heat load with the slope determined by the boundary radius. The effect of different shapes of metal slot guiding the fiber is demonstrated.

Conference Presentation

Citation Download Citation

Martin Grábner, Pavel Peterka, and Pavel Honzátko "On thermal distribution in optical fibers with active core", Proc. SPIE 11773, Micro-structured and Specialty Optical Fibres VII, 117731C (18 April 2021); https://doi.org/10.1117/12.2592921

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