Miniaturized High-Speed FBG Interrogator on Photonic AWG Chip #Photonics #WorldResearchAwards




Introduction

Arrayed waveguide gratings (AWGs) play a central role in fiber Bragg grating (FBG) interrogation systems, yet conventional AWG-based interrogators are typically bulky, complex, and difficult to deploy in harsh or space-constrained environments. These limitations restrict their applicability in advanced sensing scenarios requiring portability, robustness, and real-time response. This research addresses these challenges by presenting a highly miniaturized FBG interrogator based on a photonic AWG chip, designed to deliver high precision and high-speed wavelength demodulation for demanding engineering applications.

Photonic AWG Chip Design and Miniaturization

The core of the proposed system is an ultra-compact photonic AWG chip measuring only 280 µm × 150 µm. This chip-level integration significantly reduces system size while maintaining high spectral resolution. By embedding the AWG within a compact photonic chip module, the interrogator achieves substantial miniaturization without compromising optical performance, making it suitable for deployment in complex and constrained field environments.

Integrated Interrogator System Architecture

The developed FBG interrogator integrates three key modules: a photonic chip module, an optoelectronic detection and processing module, and an output interface module. The complete system occupies a volume of just 160 mm × 100 mm × 80 mm. This modular yet compact architecture enables efficient signal acquisition, processing, and output, supporting real-time operation and seamless integration into existing sensing and monitoring platforms.

High-Precision and High-Speed Wavelength Interrogation

Experimental wavelength interrogation tests demonstrate that the proposed interrogator achieves a wavelength accuracy of 9.87 pm with a high-speed sampling rate of up to 10 kHz. This performance enables precise and real-time FBG demodulation under rapidly varying temperature conditions. The high temporal resolution ensures accurate tracking of dynamic thermal and mechanical changes, which is critical for advanced sensing applications.

Engineering Validation under Extreme Conditions

To assess reliability and robustness, the interrogator was subjected to rigorous engineering validation experiments. Dynamic FBG wavelength demodulation was performed under high-temperature shock conditions within a turbo-engine environment. The system maintained stable and accurate performance, confirming its ability to operate reliably under extreme thermal stresses and harsh industrial conditions.

Research Impact and Engineering Applications

The successful integration of a photonic AWG chip into a compact FBG interrogator represents a significant advancement in optical sensing technology. By combining miniaturization, high precision, and high-speed operation with proven reliability under extreme conditions, this research opens new opportunities for FBG-based monitoring in aerospace, energy, and industrial systems. The proposed interrogator demonstrates strong potential for broader engineering applications requiring real-time, high-performance sensing in challenging environments.

Global Particle Physics Excellence Awards


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#photonicawg #fbginterrogator #fiberbragggrating #opticalsensing #integratedphotonics #miniaturizedsystems #realtimemonitoring #highspeeddemodulation #wavelengthinterrogation #precisionmeasurement #aerospaceengineering #turboengine #thermalmonitoring #smartstructures #harshenvironments #engineeringvalidation #opticalinstrumentation #advancedphotonics #researchinnovation #worldresearchawards

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