Search

The origin of intermittent bursts appearing in the output power of a laser diode is examined.

The importance of period-tripling behavior in various experimental studies made on directly modulated laser diodes is presented. The numerical analysis conducted indicate that the period-three solution coexist with the chaotic attractor created by a period-doubling cascade, a situation that results in a hysteresis loop. The important role of noise in achieving agreement between the experimental results and the numerical studies is further supported by the obtained route to chaos.

A study was conducted on the route to chaos produced by directly modulated semiconductor lasers subjected to a varied modulation index to determine the truncation of Feigenbaum sequence in these types of lasers. Results showed a coexistence between the period-doubling route to chaos and a period-three solution for certain values of modulation index. Moreover, noise fluctuations were found to be responsible for the effective truncation of the period doubling sequence in the route to chaos.