The effects of thermally-induced refractive index change on the guiding properties of different large mode area fibers have been numerically analyzed. A simple but accurate model has been applied to obtain the refractive index change in the fiber cross-section, and a full-vector modal solver based on the finite-element method has been used to calculate the guided modes of the fibers operating at high power levels. The results demonstrate that resonant structures added to the fiber cross-section can be exploited to provide efficient suppression of high-order modes with a good resilience to thermal effects.
Proceedings of Spie, the International Society for Optical Engineering, 2013, Vol 8601
Fiber lasers; Finite element method; Photonic crystal fibers; Fibers
Main Research Area:
SPIE Photonics West : Fiber Lasers X: Technology, Systems, and Applications, 2013