Open AccessMinimization of Fresnel reflection by anti-reflection fiber Bragg grating inscribed at the fiber ends
Author(s) -
Tzong Yow Tsai,
Zhi Cheng Lee,
Hong Xi Tsao,
S. T. Lin
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.011510
Subject(s) - optics , fiber bragg grating , materials science , fresnel equations , reflection (computer programming) , phosfos , long period fiber grating , inscribed figure , graded index fiber , optical fiber , refractive index , fiber optic sensor , physics , geometry , computer science , mathematics , programming language
In this paper, we proposed and numerically demonstrated a novel method to effectively minimize Fresnel reflection from a perpendicularly cleaved fiber using a uniform fiber Bragg grating (FBG) inscribed at the fiber end. By matching the reflectivity of an in-line FBG with the reflectivity caused by the glass-air boundary, the FBG acts as a virtual boundary, which provides destructive interference and suppresses Fresnel reflection. We achieved an anti-reflection FBG with a return loss of more than 80 dB by ensuring that the product of the index contrast and grating period number is almost constant, with a value of 0.2695.