Infokommunikacionnye tehnologiiInfokommunikacionnye tehnologii2073-3909Povolzhskiy State University of Telecommunications and Informatics5623610.18469/ikt.2017.15.1.03Research ArticleMETHOD FOR PRECISION MACRO-DEFECT FORMING IN SILICA OPTICAL FIBER STRUCTUREAndreevVladimir Alexandrovich-BourdineAnton Vladimirovichbourdine@psuti.ruBurdinVladimir Alexandrovichburdin@psati.ruVasiletsAlexander Alexandrovicha.vasilets@mail.ruGavryushinSergey Alexandrovichsagasg@inbox.ruEvtushenkoAlexander S.alex2194ru@yandex.comKazakovVadim Sergeevichvadim.kazakov5@gmail.comMorozovOleg Gennadievichmicrooil@mail.ruSevrukNikita Lvovichnikasevruk@mail.ruSokolovEugeniy Dmitrievichcarlcarlson@list.ruPovolzhskiy State University of Telecommunications and InformaticsKazan National Research Technical University named after A.N. Tupolev15032017151182920122020Copyright © 2017, Andreev V.A., Bourdine A.V., Burdin V.A., Vasilets A.A., Gavryushin S.A., Evtushenko A.S., Kazakov V.S., Morozov O.G., Sevruk N.L., Sokolov E.D.2017This work presents method for precision microstructure defects “tapers” and “up-tapers” forming in conventional silica telecommunication multimode optical fibers by commercially available field fusion splicer with modified software sets. We developed technique for micro-defect geometry parameters estimation via analysis of photo-image performed after defect writing and displayed on fusion splicer monitor. Some research results of defect geometry dependence on fusion current and fusion time values re-set in splicer program are represented that provided ability to choose their “the best” combination. 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