title: Complexity and bandwidth enhancement in unidirectionally coupled semiconductor lasers with time-delayed optical feedback.
abstract: We numerically investigate the frequency bandwidth and the autocorrelation characteristics of chaotic temporal wave forms in unidirectionally coupled semiconductor lasers with time-delayed optical feedback. We evaluate the complexity of the chaotic temporal wave forms by using Lyapunov exponents. We found that larger maximum Lyapunov exponents can be obtained for smaller peak values of the autocorrelation function at the delay time of the optical feedback. On the contrary, the maximum Lyapunov exponent is independent from the frequency bandwidth of the chaotic temporal wave forms.
authors.affiliation: Department of Electronics Engineering and Computer Science, Fukuoka University, 8-19-1 Nanakuma, Johnan-ku, Fukuoka 814-0180, Japan.
authors.forename: Kazutaka
authors.initials: K
authors.lastname: Kanno
authors.affiliation: Department of Information and Computer Sciences, Saitama University, 255 Shimo-okubo, Sakura-ku, Saitama City, Saitama, 338-8570, Japan.
authors.forename: Atsushi
authors.initials: A
authors.lastname: Uchida
authors.affiliation: Department of Electronics Engineering and Computer Science, Fukuoka University, 8-19-1 Nanakuma, Johnan-ku, Fukuoka 814-0180, Japan.
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Bunsen