Optimized mode-field adapter for low-loss fused fiber bundle signal and pump combiners

0457544 - ÚFE 2016 RIV US eng C - Conference Paper (international conference)
Koška, Pavel - Baravets, Yauhen - Peterka, Pavel - Písařík, M. - Bohata, J.
Optimized mode-field adapter for low-loss fused fiber bundle signal and pump combiners.
Proceedings of SPIE-FIBER LASERS XII: TECHNOLOGY, SYSTEMS, AND APPLICATIONS. Vol. 9344. BELLINGHAM: SPIE, 2015 - (Ballato, J.; Shaw, L.), 93442I. ISBN 978-1-62841-434-9. ISSN 0277-786X.
[Conference on Fiber Lasers XII - Technology, Systems, and Applications. San Francisco (US), 09.02.2015-12.02.2015]
R&D Projects: GA MPO FR-TI4/734
Institutional support: RVO:67985882
Keywords : Fiber laser * Mode-field adapter * Double clad fiber
Subject RIV: BH - Optics, Masers, Lasers

In our contribution we report novel mode field adapter incorporated inside bundled tapered pump and signal combiner. Pump and signal combiners are crucial component of contemporary double clad high power fiber lasers. Proposed combiner allows simultaneous matching to single mode core on input and output. We used advanced optimization techniques to match the combiner to a single mode core simultaneously on input and output and to minimalize losses of the combiner signal branch. We designed two arrangements of combiners' mode field adapters. Our numerical simulations estimates losses in signal branches of optimized combiners of 0.23 dB for the first design and 0.16 dB for the second design for SMF-28 input fiber and SMF-28 matched output double clad fiber for the wavelength of 2000 nm. The splice losses of the actual combiner are expected to be even lower thanks to dopant diffusion during the splicing process
Permanent Link: http://hdl.handle.net/11104/0257927