[OPTICAL REVIEW Vol. 20, No. 4 (2013) 314-320]
© 2013 The Japan Society of Applied Physics

Synchronization Properties and Effects of Parameter Mismatches in Unidirectionally Coupled Chaotic Vertical-Cavity Surface-Emitting Lasers

Shinnya TOMIDA1, Rui SHOGENJI2, and Junji OHTSUBO2*

1Graduate School of Engineering, Shizuoka University, Hamamatsu 432-8561, Japan
2Faculty of Engineering, Shizuoka University, Hamamatsu 432-8561, Japan

(Received October 5, 2012; Accepted May 15, 2013)

We numerically investigate the effects of parameter mismatches on chaos synchronization in vertical-cavity surface-emitting lasers (VCSELs). We assume injection-locked chaos synchronization in a unidirectionally coupled and open-loop optical feedback system. The accuracy of chaos synchronization is greatly affected by the mismatches of the device parameters and operation conditions between the two lasers. In particular, the oscillation frequency of the laser is one of the important parameters in a system of injection-locked chaos synchronization. However, the variations of the device characteristics of VCSELs are very large compared with those of other types of semiconductor lasers. We study the effects of parameter mismatches related to the oscillation frequency of VCSELs on chaos synchronization. We proved that mismatches in terms of the birefringence and the injection current play crucial roles for the quality of chaos synchronization.

Key words: vertical-cavity surface-emitting lasers, chaos synchronization, optical feedback, parameter mismatch, polarization

*E-mail address: tajohts@ipc.shizuoka.ac.jp