Fig. 4: Numerical evaluation of the locking ratio. | Communications Physics

Fig. 4: Numerical evaluation of the locking ratio.

From: Injection-locking dynamics of two self-pulsing nanocavities optically coupled on photonic integrated circuit

Fig. 4

a Power Spectra Density (PSD) of the output signal of a single cavity as function of the laser wavelength (y-axis) at an input power of 5.5 dBm. The fundamental peak of the modulation is observed ranging in between ~1 and 2.1 MHz over 420 pm. Here the linear scale is preferred to have better contrast. b PSD of the two coupled cavities for the same input power as in (a). Extra peaks appear at specific laser wavelengths where the two optical resonances overlap (back and green rectangles overlap). c Evolution of the locking ratio between uncoupled (red line) and coupled cavities (black dots) as function of the wavelength. d The colored part of this graph refers uniquely to the region where the two resonances overlap (black and green rectangles overlap in (b). The red dotted rectangle refers to the locking regions extension of (b, c).

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