Effect of parasitic elements of a ridge laser on its modulation characteristic

The effect of parasitic elements of a laser on its modulation characteristic is investigated theoretically and experimentally. It is shown that this characteristic depends on the thickness d of the insulating dielectric film, differential resistance R_d, and length L of the laser resonator. For example, at d = 0.15 μm, R_d = 9 Ω, and L = 300 μm, the upper modulation frequency at a level of –3 dB is 500 – 1500 MHz, and at d = 1.2 μm, R_d = 5 Ω, and L = 200 μm, it reaches 12 GHz.