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Spectral properties of Tilted Bragg Gratings with different tilt angles and variable surrounding conditions DOI:10.15199/48.2019.04.34

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Fiber Bragg Gratings (FBGs) have become as an important field in technology of optical sensing due to their advantages in comparison to electronic counterparts. Most important advantages of this structures used as sensing elements are extremely small size, immunity to electromagnetic interference and ability to multiplexing of many structures in single fiber. They are generally very sensitive to temperature[1] changes and elongation of fiber with inscribed grating [2-4]. An important feature of FBGs used as sensing structures is that they are sensitive to many physical quantities which could lead to undesirable cross-sensitivity which occur in the same spectral response for changes of different quantities affecting the FBG. This property generally leads to requirement of temperature compensation. Scheme of internal structure and spectral characteristics of FBGs are presented in Fig. 1. The inconveniences resulting from spectral properties of conventional FBGs could be solved by performing a technological modifications e.g. by creating a chirp (variable period of internal refractive index perturbations in fiber core) to obtain desirable spectral properties. Fig.1. Scheme of internal refractive index structure in fiber core with inscribed Conventional FBG and spectral response in transmitted and reflected light Another possibility to change the spectral behaviour of gratings is creating the structure with introduced particular angle between planes of fiber core periodic fringes and fiber cross-section plane. In case of conventional gratings, planes of refractive index perturbations are parallel to crosssection plane of fiber while in tilted grating structure planes of internal fringes are angled in relation to cross-section plane with ΘTFBG angle [5,6]. Tilted fiber Bragg gratings (TFBGs) stand out by enhancement of resonances of backward-propagating cladding modes which is most evident effect of tilt angle introducing.[...]

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