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Novel Sealing Technique for Practical Liquid-Core Photonic Crystal Fibers

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5 Author(s)
Gerosa, R.M. ; Grupo de Fotonica, Univ. Presbiteriana Mackenzie, Sao Paulo, Brazil ; Bozolan, A. ; de Matos, C.J.S. ; Romero, M.A.
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In this letter, we describe a simple and effective technique to prevent evaporation in liquid-core photonic crystal fibers (PCFs). The technique consists of using a micropipette to deploy a micro-droplet of an ultraviolet curable polymer adhesive in both core inputs. After it is cured, the adhesive creates sealing polymer plugs with quite satisfactory insertion loss (overall optical transmission of about 15%). Processed fibers remained liquid-filled for at least six weeks. From a practical point of view, we conducted a supercontinuum generation experiment in a water-core PCF to demonstrate a 120-minute spectral width stability and the ability to withstand at least 3-mW average power at the sealed fiber input. Similar experiments carried out with nonsealed fibers produced supercontinuum spectra lasting no longer than 10 minutes, with average powers kept below 0.5 mW to avoid thermally induced evaporation.

Published in:

Photonics Technology Letters, IEEE  (Volume:24 ,  Issue: 3 )