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Ring structures in microstructured polymer optical fibres

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Abstract

Recent developments in polymer microstructured optical fibres allow for the realisation of microstructures in fibres that would be problematic to fabricate using glass-based capillary stacking. We present one class of such structures, where the holes lie on circular rings. A fibre of this type is fabricated and shown to be single moded for relatively long lengths of fibre, whereas shorter lengths are multimoded. An average index model for these fibres is developed. Comparison of its predictions to the calculated properties of the exact structure indicates that the ring structures emulate homogeneous rings of lower refractive index resulting in the ring structured fibres behaving approximately as cylindrically layered fibres.

©2001 Optical Society of America

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Figures (4)

Fig. 1.
Fig. 1. Optical micrograph of the cross section of the preform neck-down region. The image width corresponds to approximately 1.5 mm. Several ring structured sections can be seen with different sized holes. The structure on which the optical experiments were conducted and which was modelled is that in the lower left corner with the larger holes.
Fig. 2.
Fig. 2. Electron micrograph of a cross section of the microstructured polymer optical fibre.
Fig. 3.
Fig. 3. (a) A circular ring of holes is expected to behave like a circular layer of lower refractive index (b), the corresponding refractive index profile is shown in (c). Several equally spaced rings of holes of equal air-filling fraction will result in an index profile such as that shown in (d), i.e. a Bragg fibre.
Figure 4.
Figure 4. The average index profile calculated for the structure described in the text. The averaging method used was to take the arithmetic mean of the refractive index over 360° for fixed values of the radius. This gives a value for the average between the two limits of Eq. (1). The average index profile is constructed out of 40 layers.

Tables (1)

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Table 1. Mode class and effective indices of the first five modes as calculated by the multipole method and the average index model, using the arithmetic mean of the refractive index.

Equations (2)

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( f n inc 2 + 1 f n matrix 2 ) 1 2 n av fn inc 2 + ( 1 f ) n matrix 2 .
n av = fn inc + ( 1 f ) n matrix ,
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