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Intensity noise reduction in a multiwavelength distributed Bragg reflector fiber laser
Shilpa Pradhan1, Graham E Town, Doug Wilson
1Department of Electronics and Centre for Lasers & Applications, Macquarie University, Sydney, New South Wales, Australia. pradhan@ics.mq.edu.au
Optics Letters
|September 27, 2006
Summary
Noise in multiwavelength fiber lasers was reduced by 20 dB using negative feedback. This method modulates the laser pump diode
Area of Science:
- Optics and Photonics
- Laser Physics
Background:
- Distributed Bragg reflector (DBR) fiber lasers are crucial for various applications.
- Intensity noise is a significant limitation in DBR fiber laser performance.
- Multiwavelength operation introduces unique noise characteristics.
Purpose of the Study:
- To demonstrate effective noise reduction in a multiwavelength DBR fiber laser.
- To investigate the impact of negative feedback on laser intensity noise.
- To explore strategies for mitigating both in-phase and antiphase noise components.
Main Methods:
- Implementation of a negative feedback system to control laser output.
- Modulation of the drive current of the laser pump diode.
- Analysis of intensity noise spectra to quantify reduction.
Main Results:
- Achieved a 20 dB reduction in in-phase intensity noise.
- Demonstrated the efficacy of the negative feedback approach.
- Identified key parameters influencing noise levels.
Conclusions:
- Negative feedback is a viable strategy for significant noise reduction in multiwavelength DBR fiber lasers.
- The presented method effectively suppresses in-phase noise.
- Further research can explore advanced techniques for antiphase noise reduction.
