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Septia Putri Ayu
Department of Physics, Universitas Riau, Pekanbaru 28293, Indonesia
Computer Science & IT Electrical & Electronics Engineering Engineering Materials Science & Nanotechnology

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Apodization profiles of fiber Bragg grating spectra in temperature sensor applications Septia Putri Ayu; Saktioto Saktioto; Rakhmawati Farma; Rahmondia Nanda Setiadi
Science, Technology, and Communication Journal Vol. 7 No. 1 (2026): SINTECHCOM Journal (October 2026)
Publisher : Lembaga Studi Pendidikan dan Rekayasa Alam Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59190/stc.v7i1.383

Abstract

The presence of side lobes in the FBG reflection spectrum is a critical challenge that can reduce measurement accuracy in optical sensor applications, necessitating a systematic evaluation of apodization techniques as a mitigation strategy. This study investigated the comparative effects of three apodization profiles, namely uniform, Gaussian, and tanh hyperbolic, on the spectral characteristics and performance of an sensors-based temperature sensor with a grating length of 10 mm, grating period of 0.535 µm, modulation index of 0.0001, and operating wavelength of 1550 nm, over a temperature range of 20°C to 100°C. The results showed that all three profiles produced an identical thermal sensitivity of 13.725 pm/°C with a deviation of 3.23% from the theoretical value of 14.183 pm/°C. The Gaussian profile demonstrated the most superior side lobe suppression with an average side lobe level (SLL) of -45.51 dB, exceeding the minimum standard of -20 dB by more than 25 dB, far surpassing the uniform (-16.90 dB) and tanh (-18.17 dB) profiles. These findings establish the Gaussian apodization profile as the most optimal configuration, delivering the highest spectral quality without compromising thermal sensitivity.
Co-Authors Rahmondia Nanda Setiadi Rakhmawati Farma Saktioto Saktioto