Abstract
We report for the first time on tapering inhibited coupling (IC) hypocycloid-core shape Kagome hollow-core photonic crystal fibers whilst maintaining their delicate core-contour negative curvature with a down-ratio as large as 2.4. The transmission loss of down-tapered sections reaches a figure as low as 0.07 dB at 1550 nm. The tapered IC fibers are also spliced to standard SMF with a total insertion loss of 0.48 dB. These results show that all-fiber photonic microcells with the ultra-low loss hypocycloid core-contour Kagome fibers is now possible.
Highlights
The advent of Inhibited-Coupling (IC) guiding Hollow-Core Photonic Crystal Fibers (IC HCPCF) [1] and the dramatic improvement in confinement loss have recently resulted from the fiber core-shaping by making a hypocycloid-like contour [2]
We report for the first time on tapering inhibited coupling (IC) hypocycloid-core shape Kagome hollow-core photonic crystal fibers whilst maintaining their delicate core-contour negative curvature with a down-ratio as large as 2.4
The tapered IC fibers are spliced to standard single mode fiber (SMF) with a total insertion loss of 0.48 dB
Summary
The advent of Inhibited-Coupling (IC) guiding Hollow-Core Photonic Crystal Fibers (IC HCPCF) [1] and the dramatic improvement in confinement loss have recently resulted from the fiber core-shaping by making a hypocycloid-like contour (i.e. negative curvature) [2] This new branch of HC-PCF outperforms their photonics band-gap (PBG) guiding counterparts both in term of transmission bandwidth and attenuation in the visible and near-IR. The effect of the negative curvature on the loss reduction was observed even with a single ring cladding design [7,8] with transmission loss of ~30 dB/km around 3-4 μm wavelength range [9] Due to these optical performances, such fibers became very attractive and it is worthy to be able to splice them to standard single mode fiber (SMF) for further application in gas photonics and integration via efficient photonics microcells (PMCs) [10]. A systematic study on the transition lengths and down ratios have been investigated, resulting in a minimum downtaper loss of 0.07 dB at 1550 nm and a record SMF to Kagome splice loss of 0.48 dB combined with good mechanical fuse compatible with a tension of several hundred grams
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