Stable microwave oscillations due to external-cavity-mode beating in laser diodes subject to optical feedback

2002/09/17 by T. Erneux, Thomas Erneux, A. Gavrielides +2
Engineering · Physics and Astronomy · #Advanced Fiber Laser Technologies #Photonic and Optical Devices #Semiconductor Lasers and Optical Devices

paper · doi:10.1103/physreva.66.033809

openalex publication_date 2002/09/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

Laser diodes subject to a delayed optical feedback may exhibit high-frequency oscillating intensities as a result of a beating between two external-cavity-modes (ECMs). We analyze the conditions for the stability of these microwave oscillations in the framework of the Lang-Kobayashi equations for a single-mode edge-emitting semiconductor laser [R. Lang and K. Kobayashi, IEEE J. Quantum Electron. QE-16, 347 (1980)]. We show that two different scenarios are possible. If the linewidth enhancement factor is relatively large (\ensuremathα=2\ensuremath-5), the beating occurs between a stable ECM (mode) and an unstable ECM (antimode). The stability of the time-periodic solution is then limited in parameter space. But if the linewidth enhancement factor is sufficiently low (\ensuremathα<~\ensuremathα_c\ensuremath≃1), a beating between two stable modes is possible allowing stable high-frequency oscillating outputs.

Citations

• External optical feedback effects on semiconductor injection laser properties

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