Comparative analysis on the observed non-linear dynamics between single diode lasers and lateral coupled diode lasers

The analysis of the RIN spectrum of the LCDL devices allows important information on the nonlinear behaviour of Laterally Coupled Diode Lasers (LCDL). Under certain bias conditions, the second resonance frequency characteristic of the LCDL devices is at double the relaxation oscillation frequency and, for the first time, a period doubling is observed. This effect is similar to a single diode laser when is current modulated at the double of the relaxation oscillation frequency. So, in this paper a comparative study between period doubling evolution obtained in LCDL device versus the single laser diode is made.