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Coherence-collapsed 1.3-microm multimode laser diode for the fiber-optic gyroscope
Optics Letters
|October 28, 2009
Summary
Coherence-collapsing feedback decouples longitudinal modes in a laser diode. This broadens the linewidth, making it suitable for low-drift fiber-optic gyroscopes.
Area of Science:
- Photonics and Optical Engineering
- Laser Physics
- Fiber Optic Sensing
Background:
- Multimode laser diodes often exhibit unstable longitudinal modes.
- Fiber-optic gyroscopes require stable, low-drift performance.
- Broadened linewidths can improve gyroscope signal processing.
Purpose of the Study:
- To investigate the effect of coherence-collapsing feedback on multimode laser diodes.
- To assess the suitability of modified laser diodes for fiber-optic gyroscopes.
Main Methods:
- Application of coherence-collapsing feedback to a 1.3-micrometer (µm) multimode laser diode.
- Analysis of longitudinal mode decoupling and linewidth broadening.
Main Results:
- Coherence-collapsing feedback successfully decoupled longitudinal modes.
- Significant broadening of the laser linewidth was achieved.
- The modified laser diode demonstrated suitability for low-drift applications.
Conclusions:
- Coherence-collapsing feedback is an effective method for enhancing laser diode properties.
- This technique enables the use of multimode laser diodes in high-performance fiber-optic gyroscopes.
- Further research can explore optimization for various gyroscope designs.
