Abstract
A gain-switched laser operating at a 20-GHz repetition rate exhibited chaos and period-doubling depending on the bias condition, which was the first observation for 1.55-/spl mu/m strain-compensated InGaAlAs-InGaAsP multiple-quantum-well (MQW) lasers. Unlike the case previously reported for bulk lasers, the irregular behavior was set over wide bias current conditions for the MQW laser. We show that the instability is attributable to a small gain compression factor of the MQW laser and a high-repetition frequency of the gain-switching operation. Further, we report that the irregular behavior can be successfully suppressed by seeding the laser with external coherent-light injection. The numerical simulations of a set of rate equations using parameters extracted from small-signal modulation characteristics were carried out in order to clarify the conditions for the stabilization of the gain-switching operation. The scenario behind the inhibition of irregular behavior was due to the enhanced damping phenomena of a nonlinear oscillator induced by the injection seeding light. The influence of the /spl alpha/ parameter on the optical pulse distortion under the external seeding and the parametric dependence for a single-period operation were investigated based on numerical simulation.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
