6GHz and CISK in semiconductor lasers for chaotic communications

Chaotic synchronization in injection semiconductor lasers with optical feedback applied to optical secure communications is presented. The two chaotic systems can be synchronized with a gradually process to gradually steady in full space. Synchronous transient response to a pulse of injecting light is studied. Influences of the white noise on the synchronous error, and the synchronous characteristic with optical feedback are studied in detail. Chaos masking with a sinusoidal frequency of 6GHz signal and chaotic injecting shift keying (CISK) in the system are numerically simulated in optical secure communications. The both systems show a good ability of robust security and anti-uncover.