A deformed square microcavity laser, based on internal mode interactions, exhibits spontaneous chaotic behavior without external disturbances. Unlike traditional methods that rely on photodetectors for photoelectric conversion, we propose and demonstrate a novel approach to directly extract chaotic signals from the laser's P-electrode. This scheme successfully extracts the chaotic electrical signal with a 4.4GHz bandwidth. Our approach offers advantages in cost-effectiveness and simplicity. It holds promise for applications such as high-speed physical random number generation and radar detection.
Deformed square microcavities composed of two partly overlapped square microcavities are proposed and investigated theoretically and experimentally. Single-mode lasing with the maximum side-mode suppression ratio (SMSR) of 39 dB and 52 dB are obtained for the deformed square microcavity lasers, connected an output waveguide to the jointed region and a vertex of the square microcavities, with a side length of 10 μm, respectively. Furthermore, higher output power is obtained for the deformed square microcavity laser with a vertex output waveguide than that with an output waveguide to the jointed region.
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