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Updated: Oct 30, 2025

Real-Time Monitoring of Neurocritical Patients with Diffuse Optical Spectroscopies
Published on: November 19, 2020
Photonic Integrated Interrogator for Monitoring the Patient Condition during MRI Diagnosis
Mateusz Słowikowski1,2, Andrzej Kaźmierczak1, Stanisław Stopiński1,3
1Institute of Microelectronics and Optoelectronics, Warsaw University of Technology, 00-662 Warsaw, Poland.
Abstract:
In this work, we discuss the idea and practical implementation of an integrated photonic circuit-based interrogator of fiber Bragg grating (FBG) sensors dedicated to monitoring the condition of the patients exposed to Magnetic Resonance Imaging (MRI) diagnosis. The presented solution is based on an Arrayed Waveguide Grating (AWG) demultiplexer fabricated in generic indium phosphide technology. We demonstrate the consecutive steps of development of the device from design to demonstrator version of the system with confirmed functionality of monitoring the respiratory rate of the patient. The results, compared to those obtained using commercially available bulk interrogator, confirmed both the general concept and proper operation of the device.
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