Tang, T.-Y.T.-Y.TangTseng, P.-Y.P.-Y.TsengChiu, C.-Y.C.-Y.ChiuLin, C.-N.C.-N.LinCHIH-CHUNG YANGYEAN-WOEI KIANG2020-06-112020-06-11200300913286https://scholars.lib.ntu.edu.tw/handle/123456789/497856https://www.scopus.com/inward/record.uri?eid=2-s2.0-0041974821&doi=10.1117%2f1.1578647&partnerID=40&md5=4aaae3039d907a744936b5bc92bbfc34Periodical perturbations along an optical fiber can cause power coupling between the core and cladding modes for the applications of spectral filtering and derivative operations. Such perturbations can be generated through periodical loading on fiber. By applying loading onto a fiber with two face-to-face, identical groove structures, it was found that the long-period grating effects were dependent on the relative phase of the two periodical corrugations. Particularly, when the relative phase was zero (crest to crest), spectral filtering effects disappeared completely. The comparisons of such results between the cases of jacketed and unjacketed fibers led to the conclusion that geometric deformation, instead of direct pressure-induced effects, was the dominating mechanism for generating spectral filtering functions in the double-sided loading configuration. The same conclusion can be applied to a single-sided loading device. © 2003 Society of Photo-Optical Instrumentation Engineers.Long-period fiber grating; Microbending; Mode coupling[SDGs]SDG11Cladding (coating); Deformation; Optical fibers; Pressure effects; Microbending; Fiber Bragg gratingsjournal article10.1117/1.15786472-s2.0-0041974821