Experimental researches and testing of silica twisted six-GeO2-doped core microstructured optical fiber. Part IV: Results of spectral response measurements under direct tension

This work presents results of test series, performed for earlier on designed and successfully fabricated silica few-mode microstructured optical fibers (MOF) with six GeO2-doped cores, induced twisting 50 revolutions per meter, typical “telecommunication” outer diameter 125 µm, core diameter 8.7 µm, air hole diameter 4.6 µm, pitch 7.2 µm, and core graded refractive index profiles with height 0.0275. While Part I introduced results of differential mode delay map measurements with laser source excitation / laser-based data transmission over multimode optical fibers (MMFs) with core diameters 50 and 100 µm, combined with 6-core MOF, Part II was concerned with researches of spectral responses, measured for fiber Bragg gratings, recorded in these MOFs, and Part III was focused on laser beam profile measurements, performed for weakly and strong twisted 6-core-MOFs, Part IV reports results of MMF-MOF-MMF fiber optic structure spectral response measurements under direct tension with pull load 0…300 g.