Doublet structure in the optical spectrum of a semiconductor laser with optoelectronic feedback in a square-wave regime - Archive ouverte HAL Access content directly
Journal Articles Applied Physics Letters Year : 2022

Doublet structure in the optical spectrum of a semiconductor laser with optoelectronic feedback in a square-wave regime

Md Shariful Islam
A. Kovalev
V. Iachkula
  • Function : Author
E. Viktorov
D. Citrin
A. Locquet

Abstract

We observe an optical spectrum consisting of a doublet in the output of a semiconductor laser diode with optoelectronic feedback in a dynamical regime in which a self-sustained square-wave modulation is observed, depending on injection current and feedback strength. The doublet frequency splitting is strongly correlated with the duty cycle of the square wave; both parameters as well as the relative magnitude of the peaks are observed to vary with the feedback level. A rate equation model reproduces the spectral doublets. The appearance of the doublet is attributed to active medium gain saturation and refractive index dependence on the carrier density.
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Dates and versions

hal-03943887 , version 1 (17-01-2023)

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Md Shariful Islam, A. Kovalev, V. Iachkula, E. Viktorov, D. Citrin, et al.. Doublet structure in the optical spectrum of a semiconductor laser with optoelectronic feedback in a square-wave regime. Applied Physics Letters, 2022, 121 (26), pp.261101. ⟨10.1063/5.0127719⟩. ⟨hal-03943887⟩
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