{'fraction_non_alphanumeric': 0.026184538653366583, 'fraction_numerical': 0.007481296758104738, 'mean_word_length': 5.581967213114754, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Broadband chaos generation by semiconductor lasers subject to bright and dark optical comb injections

Broadband random signal generations using nonlinear laser dynamics have been widely studied [1]. For potential applications such as spread-spectrum communication and ultra wideband ranging [2,3], signals with bandwidths as broad as possible are required. To enhance the bandwidth of laser chaos, schemes combining optical injection with either optical feedback or optoelectronic feedback have been proposed [1,4]. While the bandwidth of the chaos state is generally broader at a higher injection level, a reversed period-doubling bifurcation route out of chaos could happen under strong injection [5]. Therefore, a perturbation scheme that generates chaos at a high injection level is often desired.