Experimental and numerical analysis of optical frequency comb generation in gain-switched semiconductor lasers subject to optical injection

Alejandro Rosado; Jaime Díez; Ana Quirce; Antonio Pérez-Serrano; Jose Manuel G. Tijero; Angel Valle; Luis Pesquera; Ignacio Esquivias

doi:10.1117/12.2554563

1 April 2020 Experimental and numerical analysis of optical frequency comb generation in gain-switched semiconductor lasers subject to optical injection

Alejandro Rosado, Jaime Díez, Ana Quirce, Antonio Pérez-Serrano, Jose Manuel G. Tijero, Angel Valle, Luis Pesquera, Ignacio Esquivias

Author Affiliations +

Proceedings Volume 11356, Semiconductor Lasers and Laser Dynamics IX; 113560E (2020) https://doi.org/10.1117/12.2554563
Event: SPIE Photonics Europe, 2020, Online Only

Abstract

An experimental and theoretical analysis of the effect of optical injection on optical frequency combs generated by gain-switching a single mode laser is performed. Combs with a frequency separation f_R in the GHz range are generated by gain-switching a discrete mode laser (DML). The effect of optical injection on the comb has been analyzed for a wide range of the injected power and detuning of the injected master laser from the DML frequency. A rich variety of nonlinear behaviours is found when the injected power is increased for a fixed value of the detuning. At low injected powers two combs due to the gain-switched laser and the injected field are obtained with the same frequency spacing f_R. As the injected power is increased, the comb from the gain-switched laser locks to the master laser. In the parameter space spanned by detuning and optical injection strength, we obtain several regions of locked combs with a tongue shape around detuning values given by multiples of the frequency spacing of the comb f_R. When injected power is further increased combs with frequency spacing equal to rational fractions of f_R are obtained. We also obtain irregular behaviour with low values of the ratio between the intensity of comb lines and noise level. Numerical simulations are in very good agreement with the experimental results.

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Alejandro Rosado, Jaime Díez, Ana Quirce, Antonio Pérez-Serrano, Jose Manuel G. Tijero, Angel Valle, Luis Pesquera, and Ignacio Esquivias "Experimental and numerical analysis of optical frequency comb generation in gain-switched semiconductor lasers subject to optical injection", Proc. SPIE 11356, Semiconductor Lasers and Laser Dynamics IX, 113560E (1 April 2020); https://doi.org/10.1117/12.2554563

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