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Reduction of Fresnel Back-Reflection at Splice Interface Between Hollow Core PCF and Single-Mode Fiber

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3 Author(s)
Couny, F. ; Univ. of Bath, Bath ; Benabid, F. ; Light, P.S.

Optical feedback from the Fresnel reflection at the air-silica interface of a splice between a hollow core photonic crystal fiber (HC-PCF) and a conventional fiber can cause laser instability or damage. The reported solution consists of the preparation of angle cleaved fibers, spliced together using a filament fusion splicer. A reduction of 44 dB of the return loss is observed. The method will considerably reduce potential damage such as fiber fusion in case of a fiber laser. The method is also demonstrated to decrease the Fabry-Perot effect in setups such as saturable absorption when the spliced HC-PCF is used as a gas cell device.

Published in:

Photonics Technology Letters, IEEE  (Volume:19 ,  Issue: 13 )