This work reports results of dispersion analysis, performed for the fundamental mode of silica microstructured optical fiber (MOF) with six GeO2-doped cores. We used commercially available software COMSOL Multiphysics® 6.1 with rigorous full vectorial finite element method, while earlier on fabricated and presented MOF with six step-index GeO2- doped cores end face photo image was applied to get averaged parameters for input data. Therefore, modeled multi-core MOF has typical “telecommunication” outer diameter 125 µm, it contains six cores with diameter 9.0 µm and step refractive index profile with height n=0.0275, 121 air holes with diameter 5.0 µm and pitch 7.8 µm. In this work we present results of the fundamental mode 1st…3rd order dispersion parameters, computed over all ratified “telecommunication” wavelength bands.
The experimental study of attenuation distribution changes of optical fiber in cable due cyclic temperature variations is represented in paper. It was observed that attenuation coefficient changes due temperature effect varies in irregular manner, that can be caused by redistribution of fiber curvature along cable. The fiber segments corresponding to the outer cable coils on the drum are most affected by temperature cycling, that can be due high thermal inertia of cable drum. The length of fiber segment with noticeable attenuation rising is approximately 500 m. The irregular local attenuation changes demonstrate the optical fiber curvature redistribution in cable due cyclic temperature variation and also can be used for estimation of variation of mechanical stresses.
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