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Mode selection and amplification from optical frequency combs by optical injection locking: a numerical study of
Applied Optics
|October 18, 2022
Summary
Optical frequency comb injection locking introduces excess noise due to residual side modes. This study analyzes noise behaviors and their dependence on system parameters for low-noise design.
Area of Science:
- Optics
- Laser Physics
- Optical Engineering
Background:
- Optical frequency combs (OFCs) are crucial for precision measurements.
- Optical injection locking is used for mode selection and amplification in OFCs.
- Noise in OFC systems, particularly from residual side modes, requires detailed investigation.
Purpose of the Study:
- To numerically investigate noise behaviors in OFCs subjected to optical injection locking.
- To analyze the impact of residual side modes and inter-mode noise.
- To understand the mechanisms causing excessive noise during comb laser injection.
Main Methods:
- Numerical simulation of noise in OFC systems.
- Analysis of interference between residual side modes and resonances.
- Examination of noise generation within Arnol'd tongues due to optical phase forcing.
Main Results:
- Comb laser injection generates excessive noise compared to single-mode laser injection.
- Interference between residual side modes and resonances is a primary noise source.
- Sub-gigahertz comb mode spacing exacerbates noise issues.
Conclusions:
- Optical injection locking of OFCs can introduce significant noise, especially with narrow mode spacing.
- Understanding noise dependencies on comb mode spacing, seeding power, and detuning is vital.
- This research aids in designing and operating low-noise OFC systems.
