Abstract
This work presents fabricated silica microstructured optical fiber with special equiangular spiral six-ray geometry, an outer diameter of 125 µm (that corresponds to conventional commercially available telecommunication optical fibers of ratified ITU-T recommendations), and induced chirality with twisting of 200 revolutions per minute (or e.g., under a drawing speed of 3 m per minute, 66 revolutions per 1 m). We discuss the fabrication of twisted microstructured optical fibers. Some results of tests, performed with pilot samples of designed and manufactured stellar chiral silica microstructured optical fiber, including basic transmission parameters, as well as measurements of near-field laser beam profile and spectral and pulse responses, are represented.
Highlights
Twisted optical fibers have been known since the early 1980s: here the concept of fiber spinning was originally introduced for the first time in the work of [1], and it is based on rotation of preform during the fiber drawing [1] or direct spinning of the drawn fiber instead of preform [2]
It is supposed that spiral geometry of microstructured optical fibers (MOFs) combined with induced chirality would improve modal stability
For the weak induced chirality sample of ESSR-MOF, the optical pulse keeps its envelope without any DMD12 of 16 distortions over the whole researched offset range, while for ESSR-MOF with twisting, 66 revolutions per meter optical pulse splits under strong offset launching conditions
Summary
Twisted optical fibers have been known since the early 1980s: here the concept of fiber spinning was originally introduced for the first time in the work of [1], and it is based on rotation of preform during the fiber drawing [1] or direct spinning of the drawn fiber instead of preform [2]. There are known published works (both theory and containing practice implementation), declaring twisted MOFs as polarization-maintaining fiber optic devices with generation optical activity [11,12,13,14,15], fiber optic probes for strain and twist sensing [16] as well as for current and magnetic field sensing [17], spectral and mode filters [18], optical tweezers, and optical angular orbital momentum (OAM)-based telecommunications [19,20,21,22,23,24,25,26,27]. According to the performed series of tests, which demonstrated low attenuation and the ability to impact differential mode delay, fabricated pilot samples of ESSR-MOF with induced chirality show good potentiality for utilization in the various above-mentioned applications of twisted MOFs, which undoubtedly requires additional future research
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