METHOD AND ELECTRODE ARRANGEMENT FOR INDUCING FLAT FREQUENCY MODULATION RESPONSE IN SEMICONDUCTOR LASER
In order to induce a flat frequency modulation response in a multi-electrode semiconductor laser (10′) which includes an active region (12) and at least one phase control region (14) with no active layer, a modulation current is applied to both of the active region (12) and the phase control region (14). Further, an improved electrode arrangement for inducing a flat frequency modulation response in a multi-electrode semiconductor laser (10′) is present. The semiconductor laser includes three regions: an active region (12), a phase control region (14) and a Bragg reflector region (16). Each of the active region, the phase control region and the Bragg reflector region being provided with an electrode (30a,30b′,30b˝,30c) for receiving an injection current, wherein the electrode provided for the active layer extends into the phase control region.