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Optical feedback interferometry with 40 km transmission distance based on a distributed feedback fiber laser
Optics Letters
|July 30, 2021
Summary
This study presents an all-fiber self-mixing velocimeter using laser feedback for long-distance measurements. It successfully measured non-cooperative target velocity over 40 km, overcoming traditional coherence length limitations.
Area of Science:
- Fiber optics
- Laser interferometry
- Remote sensing
Background:
- Traditional self-mixing interferometry is limited by laser coherence length.
- Long-distance remote sensing requires robust measurement techniques.
- Fiber-based systems offer flexibility and compactness.
Purpose of the Study:
- To propose and validate an all-fiber self-mixing interferometric method.
- To demonstrate extended measurement distances beyond laser coherence length.
- To assess the feasibility for remote sensing of non-cooperative targets.
Main Methods:
- Development of an all-fiber self-mixing interferometer utilizing laser feedback.
- Theoretical analysis of the self-mixing sensor's measurement range.
- Experimental verification using a non-cooperative target at extended distances.
Main Results:
- The self-mixing sensor's measurement distance is not constrained by the laser's coherence length.
- Successful velocity measurement of a non-cooperative target was achieved.
- Demonstrated capability over a 40 km transmission distance.
Conclusions:
- The all-fiber self-mixing Doppler velocimeter offers high sensitivity and a compact structure.
- It exhibits significant application prospects in remote sensing measurements.
- Its flexibility suits complex environments for non-cooperative target detection.
