Tahito AIDA and Yoshiki IINO

NHK Science & Technical Research Laboratories, Kinuta 1-10-11, Setagaya-ku, Tokyo, 157 Japan

(Received March 6, 1995; Accepted June 19, 1995)

Effects of small signal injection on an electro-optical bistable system with a very large delay are theoretically and experimentally investigated from the viewpoint of linear stability analysis. The resonance phenomena and frequency locking are observed when sinusoidal and rectangular small signals are additively injected into the system. Experiments confirm that theoretical results obtained by linear stability analysis are good predictions of the effects of both resonance and frequency-locking phenomena and show the dependence of these phenomena on the system parameters. As an application of the frequency locking phenomenon to the dynamical memory, the phase identification of the memory oscillation using the frame pulse externally injected is successfully executed.

Key words : ring resonator, bistable system, delayed feedback, nonlinear oscillation, signal injection, fre-quency-locking, resonance