Related Experiment Video
Updated: Feb 25, 2026
07:45
Quasi-light Storage for Optical Data Packets
Published on: February 6, 2014
11.4K
Filtered pseudo random modulated fiber amplifier with enhanced coherence and nonlinear suppression
Optics Express
|August 10, 2017
Summary
A novel filtered pseudo-random modulation technique improves coherent beam combining efficiency and stimulated Brillouin scattering (SBS) suppression in fiber amplifiers. This method enhances amplifier performance for high-power, narrow-linewidth applications.
Area of Science:
- Fiber optics
- Nonlinear optics
- High-power lasers
Background:
- Pseudo-random phase modulation signals offer stimulated Brillouin scattering (SBS) suppression in Yb-doped fiber amplifiers.
- However, these signals degrade visibility in coherent beam combining, reducing efficiency with path length deviations.
Purpose of the Study:
- To introduce a novel filtered pseudo-random modulation approach for improved coherent beam combining efficiency and coherence length.
- To enhance stimulated Brillouin scattering (SBS) suppression in high-power fiber amplifiers.
Main Methods:
- Utilized a low-pass radio frequency (RF) filter to mitigate high-frequency components of pseudo-random binary sequences (PRBS).
- Suppressed optical spectrum sidelobes, approximating a Gaussian visibility function.
- Investigated performance in a kW-class fiber amplifier (954 W).
Main Results:
- Achieved improved coherence lengths by up to 27%.
- Demonstrated concurrent SBS threshold enhancement of approximately 10% due to reduced spectral overlap.
- Validated theoretical and experimental data for enhanced coherence length and SBS suppression.
Conclusions:
- The filtered pseudo-random modulation approach offers simultaneous benefits for SBS suppression and coherence length.
- This technique significantly impacts the performance of high-power, narrow-linewidth, all-fiber amplifiers.
