Ultra-large bandwidth hollow-core guiding in all-silica Bragg fibers with nano-supports

摘要

We demonstrate a new class of hollow-core Bragg fibers that are composed ofconcentric cylindrical silica rings separated by nanoscale support bridges. Wetheoretically predict and experimentally observe hollow-core confinement overan octave frequency range. The bandwidth of bandgap guiding in this new classof Bragg fibers exceeds that of other hollow-core fibers reported in theliterature. With only three rings of silica cladding layers, these Bragg fibersachieve propagation loss of the order of 1 dB/m.