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Related Experiment Video

Updated: Mar 21, 2026

Development of Whispering Gallery Mode Polymeric Micro-optical Electric Field Sensors

Development of Whispering Gallery Mode Polymeric Micro-optical Electric Field Sensors

Published on: January 29, 2013

Integrated-optic current sensors with a multimode interference waveguide device.

Sung-Moon Kim, Woo-Sung Chu, Sang-Guk Kim

|May 4, 2016

Summary

This summary is machine-generated.

This study introduces a novel optical current sensor using multimode interference (MMI) devices. The sensor eliminates the need for costly bias feedback control, maintaining stable operation despite bias point drift.

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Last Updated: Mar 21, 2026

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Area of Science:

Integrated Optics
Optical Sensing
Waveguide Devices

Background:

Interferometric sensors typically require bias feedback control, increasing complexity and cost.
Maintaining a stable operating point is crucial for sensor accuracy.

Purpose of the Study:

To develop a cost-effective optical current sensor without feedback control.
To demonstrate a sensor that maintains signal integrity despite bias point drift.

Main Methods:

Integration of a multimode interference (MMI) waveguide device onto an optical current sensor chip.
Utilizing polymeric integrated optics and functional optical waveguide devices.
Employing passive quadrature demodulation.

Main Results:

A 90° phase-shifted transfer function was obtained from the MMI outputs.
The sensor successfully maintained its output signal without bias feedback control.
Demonstrated robustness against drift in the operating bias-point.

Conclusions:

The integrated MMI device enables a feedback-free optical current sensor.
This approach reduces cost and complexity while ensuring reliable performance.
The developed sensor is suitable for applications requiring stable optical current measurement.