A three‐segment laser, when separately pumped, shows both frequency switching and continuous tuning with a modulation current applied to the middle segment. The wavelength changes are attributed to gain peak shift with the carrier concentration and carrier‐induced index change. A total wavelength change of 61 A˚, a continuous tuning range of 4.1 A˚, and a tuning rate of −0.74 A˚/mA are obtained. The laser may be useful in optical FM fiber communication.