Abstract

Chaos in semiconductor lasers has enabled several applications, such as encryption in optical communications and random number generation [1]. Many of these applications require a large chaos bandwidth. In conventional technique including optical injection (OI) and optical feedback (OF), the chaos bandwidth is typically limited by the laser relaxation oscillation frequency. In this work, we experimentally demonstrate that injection of optical frequency comb can lead to broadband chaos. We report here a chaos with a bandwidth of 32.8 GHz and a spectral flatness up to 0.78. These optimized performances are maintained over an extensive range of injection parameters. The chaos performances are controlled by varying the injection current, the injection parameters, and the injected comb properties.

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