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Related Experiment Video

Updated: Nov 28, 2025

Design, Instrumentation and Usage Protocols for Distributed In Situ Thermal Hot Spots Monitoring in Electric Coils using FBG Sensor Multiplexing

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Silicon-microring-based interrogator for TDM-FBG sensors enabled by pulse compression.

Fan Yang, Wenjia Zhang, Qingwen Liu

|December 1, 2020

Summary

We developed a silicon microring resonator interrogator for fiber Bragg grating (FBG) sensors. This system achieves high-resolution strain sensing with a dynamic strain resolution of 20 nε/√Hz.

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Area of Science:

Photonics and Optical Sensing
Integrated Optics
Fiber Optic Sensors

Background:

Fiber Bragg Grating (FBG) sensors are widely used for various sensing applications.
Interrogation of multiple FBG sensors in a time-division multiplexing (TDM) scheme presents challenges in resolution and complexity.
Existing interrogation systems often require bulky or expensive components.

Purpose of the Study:

To propose and demonstrate a novel, high-resolution interrogator for TDM-FBG sensors.
To leverage silicon microring resonator (MRR) technology for efficient optical sensing.
To achieve enhanced dynamic strain resolution using advanced signal processing techniques.

Main Methods:

Development of a silicon MRR-based interrogator incorporating slope-assisted filtering and pulse compression.
Utilizing Golay coded optical pulses for interrogation of an FBG sensor array.
Implementing direct detection and signal processing with a tunable MRR filter.
Experimental validation using a 2x1 TDM-FBG sensor array for strain sensing.

Main Results:

Successful demonstration of a TDM-FBG sensor interrogation system based on silicon MRR.
Achieved a high dynamic strain resolution of 20 nε/√Hz in experimental tests.
The proposed system shows potential for compact and cost-effective FBG sensor interrogation.

Conclusions:

The proposed MRR-based interrogator offers a promising solution for high-resolution TDM-FBG sensing.
The integration of slope-assisted filtering and pulse compression significantly enhances sensing performance.
This technology paves the way for advanced optical sensing systems in various fields.