Abstract
Hollow-Core Photonic-Bandgap Fibres (HC-PBGFs) offer several distinct advantages over conventional fibres, such as low latency and radiation hardness; properties that make HC-PBGFs interesting for the high energy physics community. This contribution presents the results from a gamma irradiation test carried out using a new type of HC-PBGF that combines sufficiently low attenuation over distances that are compatible with high energy physics applications together with a transmission bandwidth that covers the 1550 nm region. The radiation induced attenuation of the HC-PBGF was two orders of magnitude lower than that of a conventional fibre during a 67.5 h exposure to gamma-rays, resulting in a radiation-induced attenuation of only 2.1 dB/km at an accumulated dose of 940 kGy.
Highlights
The air-filled propagation medium suggests excellent radiation hardness because typical radiation damage in fibre is caused by defects in silica glass
The radiation induced attenuation (RIA) as a function of total dose is shown in figure 3 together with optical transmission spectra before and after irradiation
After 940 kGy the RIA of the HC-PBGF was 2.1 dB/km while the conventional fibre had become practically opaque with a RIA of 210 dB/km
Summary
The air-filled propagation medium suggests excellent radiation hardness because typical radiation damage in fibre is caused by defects in silica glass. Because the transmission properties of HC-PBGFs are very sensitive to structural changes in the core and cladding we investigated the behaviour of this fibre type under severe irradiation. An equivalent length of conventional single-mode fibre (Corning SMF28e+) was irradiated at the same time as a reference.
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