Efficient PF-POF external LPG index Transducer

Abstract

The fabrication of long-period grating in multimode polymer optical fibers for low refractive index for liquids sensing is reported in this paper. Good sensitivity to sugar concentration on water is obtained.

Fabrication of Polymer Optical Fibre (POF) Gratings

“…The reported CYTOP POF gratings are based on the commercial multimode (MM) graded-index (GI) POF [48,49], although SM POF with CYTOP core has recently been drawn through a preform by further polymerization of MMA around MM GI POF by Zhou et al [50]. COC is an amorphous transparent copolymer, which has already been used for the fabrication of POF for their attractive feature of low moisture absorption (0.01%) and good chemical resistance though its T g is lower than the typical PMMA [31,51,52,53,54].…”

“…The bulk polymerization often gives more flexibility for the modification of the material properties through doping to improve the photosensitivity [22,64,65,66,67,68,69] as well as other functionalities. MM graded-index (GI) perfluorinated POF (CYTOP) is manufactured by Chromis Fiberoptics, Inc. (Warren, NJ, USA) through extrusion [48,92]. Recently, COC SI POF has also been fabricated by Woyessa et al, through the tube-in-rod method with injection molded preforms [95].…”

“…So far, based on different kinds of mechanisms and writing methods, many LPGs have been fabricated in SM and MM POF, SI and GI POF, as well as mPOFs as listed in Table 4 [48,67,71,72,73,75,76,78,79,82,84,87,109,110,123,135,136,138,142,147]. The point-by-point technique is the most used method used for POF LPG fabrication.…”