Bending behaviors of all-solid silica large mode area Bragg fibers

Catherine Baskiotis; Denis Molin; Géraud Bouwmans; Frans Gooijer; Pierre Sillard; Yves Quiquempois; Marc Douay

doi:10.1117/12.809089

19 February 2009 Bending behaviors of all-solid silica large mode area Bragg fibers

Catherine Baskiotis, Denis Molin, Géraud Bouwmans, Frans Gooijer, Pierre Sillard, Yves Quiquempois, Marc Douay

Proceedings Volume 7195, Fiber Lasers VI: Technology, Systems, and Applications; 719520 (2009) https://doi.org/10.1117/12.809089
Event: SPIE LASE: Lasers and Applications in Science and Engineering, 2009, San Jose, California, United States

Abstract

Fibers used for high power delivery are designed to ensure single-mode operation (in order to guarantee good output beam quality), large effective areas (A_eff) and resistance to bend-induced distortions (in order to avoid non-linear effects). For simple step index fibers, the maximum Aeff of the fundamental mode that can practically be achieved at 1.06μm is ~350μm². All-solid-silica Bragg fibers with large cores were proposed as an alternative solution for high power delivery through their fundamental core mode. These fibers consist of a low-refractive index core surrounded by a multilayer cladding that acts as a Bragg mirror. The loss spectrum of such fibers consists of a concatenation of several transmission windows separated by high-loss peaks. Here, we simultaneously study, for the first time (at our knowledge), the bending impact on Bragg fibers for the three critical properties required for high power delivery: large A_eff, single-mode propagation and low bend losses for the fundamental mode. Thanks to their specific guiding mechanism, A_eff as large as ~500μm² at 1.06μm can be achieved in Bragg fibers, while maintaining single-mode operation and bend losses lower than 0.1dB/m. Our numerical results are validated by experimental measurements on a PCVD Bragg fiber with a 40μm diameter core.

Citation Download Citation

Catherine Baskiotis, Denis Molin, Géraud Bouwmans, Frans Gooijer, Pierre Sillard, Yves Quiquempois, and Marc Douay "Bending behaviors of all-solid silica large mode area Bragg fibers", Proc. SPIE 7195, Fiber Lasers VI: Technology, Systems, and Applications, 719520 (19 February 2009); https://doi.org/10.1117/12.809089

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