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Optical coherence effects on a fiber-sensing Fabry-Perot interferometer
Applied Optics
|April 20, 2010
Summary
The temporal coherence of a laser source significantly impacts fiber-optic Fabry-Perot interferometer performance. Key parameters like peak transmission, finesse, and sensing sensitivity depend on the ratio of mirror separation to the laser
Area of Science:
- Optics and Photonics
- Fiber Optic Sensors
Background:
- Fiber-optic Fabry-Perot interferometers are crucial optical sensing devices.
- The performance of these interferometers is influenced by the properties of the light source, particularly its temporal coherence.
Purpose of the Study:
- To describe the effect of temporal coherence from a light source on a fiber-optic Fabry-Perot interferometer.
- To establish a relationship between interferometer parameters and the coherence length of the laser source.
Main Methods:
- Analysis of the ratio between end-mirror separation (h) and coherence length (L(c)) of a single-frequency laser.
- Derivation of a criterion for the maximum permissible mirror separation, h(c).
Main Results:
- Peak transmission and finesse are highly dependent on the h/L(c) ratio.
- A critical mirror separation, h(c) = (0.1/2π)L(c), is identified.
- Sensing sensitivity is shown to be associated with the h/L(c) ratio.
Conclusions:
- The temporal coherence of the light source is a critical factor in determining the transmission characteristics of fiber-optic Fabry-Perot interferometers.
- Optimizing the h/L(c) ratio is essential for maximizing interferometer performance and sensing sensitivity.
