Bandwidth-enhanced chaos synchronization in strongly injection-locked semiconductor lasers with optical feedback is numerically studied based on laser rate equations. The bandwidth of the chaotic carrier frequency in a semiconductor laser with optical feedback is expanded roughly three times by strong optical injection compared with the bandwidth when there is no optical injection. Using a bandwidth-enhanced semiconductor laser as a chaotic transmitter and receiver, we synchronized transmitter and the receiver lasers in a complete chaos synchronization scheme.

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In chaotic communications, the rate of data transmission is limited by chaotic carrier frequency. The carrier frequency is much enhanced by a strong optical injection in semiconductor lasers. Broad-band chaos synchronization of semiconductor lasers with strong optical injection and also in the presence of self-optical feedback is numerically studied