On-Chip Sub-Picometer Continuous Wavelength Fiber-Bragg-Grating Interrogator

Abstract Miniaturized fiber-Bragg-grating (FBG) interrogators are of interest for applications in the areas where weight and size controlling is important, e.g., airplanes and aerospace or in-situ monitoring. An ultra-compact high-precision on-chip interrogator is proposed based on a tailored arraye...

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Bibliographic Details
Main Authors: Yuan Zhuang, Jun Zou, Jiqiang Zhang, Lu Zhang, Jiahe Zhang, Leixin Meng, Qing Yang
Format: Article
Language:English
Published: SpringerOpen 2024-01-01
Series:Photonic Sensors
Subjects:
Online Access:https://doi.org/10.1007/s13320-023-0694-9
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Summary:Abstract Miniaturized fiber-Bragg-grating (FBG) interrogators are of interest for applications in the areas where weight and size controlling is important, e.g., airplanes and aerospace or in-situ monitoring. An ultra-compact high-precision on-chip interrogator is proposed based on a tailored arrayed waveguide grating (AWG) on a silicon-on-insulator (SOI) platform. The on-chip interrogator enables continuous wavelength interrogation from 1 544 nm to 1 568 nm with the wavelength accuracy of less than 1 pm [the root-mean-square error (RMSE) is 0.73 pm] over the whole wavelength range. The chip loss is less than 5 dB. The 1 × 16 AWG is optimized to achieve a large bandwidth and a low noise level at each channel, and the FBG reflection peaks can be detected by multiple output channels of the AWG. The fabricated AWG is utilized to interrogate FBG sensors through the center of gravity (CoG) algorithm. The validation of an on-chip FBG interrogator that works with sub-picometer wavelength accuracy in a broad wavelength range shows large potential for applications in miniaturized fiber optic sensing systems.
ISSN:1674-9251
2190-7439