Study of the Characteristics of Few-Mode Microstructured Optical Fibers with 6 Cores Made of Highly Doped GeO2 Silica and Induced Chirality

The necessity of using silica-based few-mode microstructured optical fibers with induced longitudinal twisting (chirality) is experimentally substantiated. The case with a 6-core made of highly doped GeO
2
silica for building the cross-section of an optical fiber is considered. Prototypes of microstructured optical fibers are fabricated and studied to exhibit the quasi-annular optical filed distribution. The results of experimental studies of the mentioned optical elements are presented and dependence of the basic characteristics on the parameters of the technological cycle of their production is estimated.