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Published on: January 7, 2019
All-optical noise-subtraction scheme for a fiber-optic gyroscope
Optics Letters
|December 7, 2007
Summary
A novel intensity-noise-subtraction technique significantly reduces noise in interferometric fiber-optic gyroscopes. This method achieves up to a 35-fold reduction in noise for unmodulated systems.
Area of Science:
- Optics and Photonics
- Sensor Technology
- Inertial Navigation
Background:
- Interferometric fiber-optic gyroscopes (IFOGs) are crucial for navigation and sensing.
- Intensity noise is a primary limitation in IFOG performance.
- Existing noise reduction methods have limitations.
Purpose of the Study:
- To introduce and demonstrate a new intensity-noise-subtraction scheme for IFOGs.
- To quantify the noise reduction achieved by the proposed method.
- To validate the scheme under different operating conditions.
Main Methods:
- A novel scheme directs an attenuated secondary light beam to the photodetector.
- This secondary beam is phase-shifted relative to the main beam.
- Destructive interference between the two beams cancels intensity noise.
Main Results:
- An intensity noise reduction factor of approximately 35 was achieved for an unmodulated IFOG.
- A reduction factor of approximately 15 was demonstrated for a square-wave modulated IFOG.
- The scheme effectively suppresses source intensity fluctuations.
Conclusions:
- The demonstrated intensity-noise-subtraction scheme offers a significant improvement in IFOG performance.
- This technique provides a practical solution for mitigating a key noise source in optical gyroscopes.
- The method is effective under both modulated and unmodulated operating conditions.
