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Effect of external noise correlation in optical coherence resonance
J M Buldú1, J García-Ojalvo, C R Mirasso
1Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya, Colom 11, E-08222 Terrassa, Spain.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|December 12, 2001
Summary
Coherence resonance in semiconductor lasers is optimized by carefully tuning external noise. Specific noise amplitude and temporal correlation achieve the best coherent response in laser output.
Area of Science:
- Nonlinear dynamics
- Semiconductor laser physics
- Stochastic processes
Background:
- Semiconductor lasers are crucial in modern optics and communications.
- Optical feedback can induce complex dynamics, including coherence resonance.
- Understanding noise effects is vital for laser stability and performance.
Purpose of the Study:
- To investigate coherence resonance in semiconductor lasers with optical feedback.
- To analyze the influence of external nonwhite noise on laser coherence.
- To identify optimal conditions for coherence resonance.
Main Methods:
- Utilizing the Lang-Kobayashi model for semiconductor laser dynamics.
- Incorporating external nonwhite noise into the pumping current.
- Employing statistical measures to quantify coherence and resonance phenomena.
Main Results:
- Coherence resonance is observed and influenced by noise characteristics.
- Both noise amplitude and temporal correlation significantly impact the coherent response.
- Optimal coherence is achieved at specific noise amplitude and correlation time values.
Conclusions:
- External nonwhite noise plays a critical role in coherence resonance.
- The study provides a quantitative characterization of optimal coherence conditions.
- Findings are relevant for controlling and enhancing semiconductor laser performance.