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Multi-Harmonic Modulation in a Fiber-Optic Gyroscope.

Martin Miranda¹, Nobuyuki Takei^1,2, Yuki Miyazawa¹

¹Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8503, Japan.

Sensors (Basel, Switzerland)

|May 13, 2023

Summary

This summary is machine-generated.

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We introduce a novel modulation technique for fiber-optic gyroscopes, achieving the highest performance reported. This method enhances precision by using multiple sinusoidal harmonics for smoother, cleaner output signals.

Area of Science:

Optics
Instrumentation
Sensor Technology

Background:

Optimizing bias modulation is key to enhancing fiber-optic gyroscope (FOG) precision.
Current methods like sinusoidal and square-wave modulation have limitations.
A need exists for improved modulation techniques offering superior performance.

Purpose of the Study:

To propose and demonstrate a novel modulation technique for FOGs using multiple harmonics of sinusoidal modulation.
To evaluate the performance of this new method compared to existing techniques.
To achieve unprecedented levels of precision in FOGs.

Main Methods:

Utilized multiple harmonics of sinusoidal modulation as an intermediate alternative.
Employed a high modulation frequency to mitigate thermal phase noise.

Keywords:

fiber-optic gyroscope multiple harmonics relative-intensity noise sinusoidal bias modulation thermal-phase noise

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Last Updated: Jul 30, 2025

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Published on: March 20, 2017

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Integrated advantages of sinusoidal and square-wave modulation for a clean output.

Main Results:

Achieved a smooth modulation with a clean, spike-free output signal.
Demonstrated a satisfactory signal-to-noise ratio.
Attained an angular random walk of 5.2(2)μdeg/h and bias instability of ~10μdeg/h.

Conclusions:

The proposed multiple harmonics modulation offers a superior alternative for FOGs.
This technique integrates the benefits of existing methods, providing enhanced performance.
The achieved results represent the highest performance reported for fiber-optic gyroscopes to date.