Abstract
We present a simple model which allows us to predict the spectral behaviour of gain-switched Fabry-Pérot (F-P) laser diodes submitted to a weak quasi-monochromatic cw (or pulsed) injection signal. Different experiments are reported for illustration, some of them being new. The model describes the competition between the injection-driven field and the spontaneousnoise driven field during pulse build-up. The relative amplitudes of the two fields are evaluated at the gains-witching time as well as the spectral content of the injection-driven field. Different types of modal selection are found depending on the injection conditions. In the case of cw injection, there is a wide range of injection frequencies leading to single-mode emission, but two-mode lasing is also predicted for lasers exhibiting strong intrinsic chirp. These results are confirmed in experiments carried out on a 1.5 μm Fabry-Pérot laser driven by different cw dfb injection lasers. In the case of pulsed injection, the laser behaviours are similar but the model also shows the influence of the pulsed-injection arrival time on the mode selection process. This is experimentally illustrated in the case of a pulsed 1.3 μm laser operated in self-injection, the injected signal resulting from a weak spectrally-filtered optical feedback.
Résumé
Les auteurs présentent un modèle simple qui permet de prédire le comportement spectral de diodes laser Fabry-Pérot (F-P) fonctionnant en régime de commutation de gain et soumises à une injection quasi-monochromatique, de faible amplitude, continue ou impulsionnelle. Différentes expériences sont rapportées en illustration, certaines étant originales. Le modèle décrit la compétition entre le champ issu de l’injection et celui issu de l’émission spontanée lors de la construction d’impulsion. Les amplitudes des deux champs sont évaluées à l’instant de commutation de même que le contenu spectral du champ issu de l’injection. Différents types de sélection modale sont obtenues suivant les conditions d’injection. En injection continue, il existe une plage étendue de fréquences pour lesquelles l’émission est monomode, mais un comportement bimode est aussi prédit pour des lasers qui présentent une forte dérive de fréquence intrinsèque (chirp). Ces résultats sont confirmés par des expériences menées sur un laser F-P à 1,5 μm piloté par différents lasers dfb d’injection. En injection impulsionnelle, les comportements sont analogues, mais le modèle montre en outre l’influence du temps d’arrivée de l’impulsion injectée sur le processus de sélection modale. Ceci est illustré expérimentalement dans le cas d’un laser impulsionnel à 1,3 μm fonctionnant en auto-injection, l’impulsion injectée résultant d’une faible réalimentation optique filtrée spectralement.
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Bouchoule, S., Lourtioz, JM. Injection-seeding and self-injection-seeding of gain-switched Fabry-Pérot laser diodes. Ann. Télécommun. 49, 595–606 (1994). https://doi.org/10.1007/BF03001314
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DOI: https://doi.org/10.1007/BF03001314
Key words
- Semiconductor laser
- Fabry-Pérot resonator
- Spectral properties
- Pulsed laser
- Laser mode
- Theoretical model
- Experimental result
- Injection locking