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Related Experiment Video

Updated: Oct 14, 2025

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Reflection-type photoplethysmography pulse sensor based on an integrated optoelectronic chip with a ring structure.

Jiabin Yan1,2,3, Ziqi Ye1,2, Fan Shi1

  • 1The Grünberg Research Centre, Nanjing University of Posts and Telecommunications, Nanjing 210003, China.

Biomedical Optics Express
|November 8, 2021
PubMed
Summary

A novel Gallium Nitride (GaN) integrated optoelectronic chip offers a compact and cost-effective solution for reflection-type photoplethysmography (PPG) pulse sensing. This technology demonstrates superior performance for cardiovascular signal measurement compared to traditional methods.

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Area of Science:

  • Optoelectronics
  • Materials Science
  • Biomedical Engineering

Background:

  • Reflection-type photoplethysmography (PPG) sensors are crucial for measuring cardiovascular signals in consumer electronics.
  • Current off-chip solutions utilize separate light-emitting diodes (LEDs) and photodetectors (PDs), leading to larger form factors and higher costs.

Purpose of the Study:

  • To propose and verify a novel Gallium Nitride (GaN) integrated optoelectronic chip for reflection-type PPG pulse sensing.
  • To investigate the performance of an integrated chip with a unique ring structure for enhanced cardiovascular signal detection.

Main Methods:

  • Development of a GaN integrated optoelectronic chip featuring two multiple-quantum well (MQW) diodes.
  • Utilizing central and peripheral MQW diodes as LED and PD, respectively, for optimal sensitivity.
  • Performance evaluation of the integrated PPG sensor using fingertip and wrist measurements.

Main Results:

  • The integrated optoelectronic chip, based on a blue LED epitaxial wafer, demonstrated superior device performance for PPG sensing.
  • Higher amplitude PPG pulse signals were recorded from fingertips compared to wrist measurements.
  • The GaN integrated optoelectronic chip proved feasible for reflection-type PPG sensors.

Conclusions:

  • The proposed GaN integrated optoelectronic chip offers a viable, smaller, and more cost-effective alternative for PPG pulse sensors.
  • This integrated approach enhances the potential for advanced cardiovascular monitoring in consumer devices.