Modeling mutually coupled non-identical semiconductor lasers on photonic integrated circuits.

Area of Science:

• Photonics and Optical Engineering
• Nonlinear Dynamics
• Semiconductor Laser Physics

Background:

• Optical coupling between lasers is crucial for photonic integration.
• Understanding laser dynamics under varying parameters is essential for device design.
• The Lang-Kobayashi model is a standard for simulating semiconductor laser behavior.

Purpose of the Study:

• To model and analyze the dynamics of two optically coupled, face-to-face single-mode lasers.
• To investigate the impact of coupling strength and frequency detuning on laser output.
• To identify bifurcations leading to different dynamical regimes.

Main Methods:

• Utilized modified Lang-Kobayashi equations to describe laser interaction.
• Solved the delay differential equation system numerically.
• Analyzed frequency changes and identified bifurcation points.

Main Results:

• Characterized dynamical regimes including one- and two-color states and self-pulsations.
• Demonstrated the influence of coupling strength and detuning on laser frequencies.
• Identified specific bifurcations responsible for transitions between regimes.

Conclusions:

• Coupling strength and frequency detuning are critical parameters controlling the dynamics of coupled lasers.
• Bifurcation analysis provides insight into the transitions between different laser operating states.
• The findings are relevant for designing stable and tunable laser systems in photonic integrated circuits.