SUBNANOSECOND TUNABLE DISTRIBUTED-BRAGG-REFLECTOR LASERS WITH AN ELECTROOPTICAL BRAGG SECTION

For the first time, a DBR laser with an electrooptical Bragg section i s reported for fast wavelength tuning operation. This structure is bas ed on the photonic integration of a Fabry-Perot buried ridge stripe la ser with a ridge waveguide modulator in which the grating is etched, B y proper structure design and adjustment of the Franz-Keldysh quaterna ry gap used in the Bragg section, a 2.5-nm tuning range with six disti nct modes is obtained for a -4 V voltage applied to the Bragg section, Under this tuning, the optical-output power variation is limited to 2 .5 dB for a 370-mu m DBR length, Using this concept, me measured the b est switching time between different wavelength channels ever reported on DBR lasers, on this device: 500 ps independently of the wavelength shift.