Abstract
We experimentally characterized a birefringent microstructured polymer fiber of specific construction, which allows for single mode propagation in two cores separated by a pair of large holes. The fiber exhibits high birefringence in each of the cores as well as relatively weak coupling between the cores. Spectral dependence of the group and the phase modal birefringence was measured using an interferometric method. We have also measured the sensing characteristics of the fiber such as polarimetric sensitivity to hydrostatic pressure, strain and temperature. Moreover, we have studied the effect of hydrostatic pressure and strain on coupling between the cores.
Highlights
Photonic crystal fibers (PCFs) made of silica have been the subject of extensive research for over a decade [1]
We present the results of investigations of a highly birefringent dual-core microstructured polymer optical fibers (mPOFs) and report on the polarimetric and intermodal sensitivity of this fiber to hydrostatic pressure, strain and temperature
As is the case in silica fibers, the sensitivity dΒ/dp in mPOF is mostly associated with the material birefringence induced in the core region by applied pressure
Summary
Photonic crystal fibers (PCFs) made of silica have been the subject of extensive research for over a decade [1]. The diameter of small holes in the microstructured cladding vary in the fiber cross section in the range of 2-6 μm, the large holes have elliptical shape with axes measuring 14 × 17.5 μm and the separation of the cores’ centers is about 11μm Both cores are single mode and possess high birefringence induced by lack of hexagonal symmetry in their surroundings. The estimated power division between the supermodes confined in the excited core, leads to the conclusion that relatively weak coupling takes place in the investigated fiber. This is in agreement with the results of numerical simulations obtained for the actual fiber geometry, Fig. 2.
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