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Wavelength tunable and directly modulated distributed Bragg reflector (DBR) lasers with butt-joint technology are designed,fabricated and characterized.The DBR laser consists of a gain section and a DBR section.To increase the electrical isolation between the gain section and the DBR section,parts of a p-doped material in the isolation region are etched off selectively.Over 2 kΩ isolation resistance is realized ultimately without the need of ion implantation,which simplifies the fabrication process.The laser exhibits high speed modulation with a large tunable range.The 3dB direct modulation bandwidth of the device is over 8GHz in a 12nm tunable range.This widely tunable DBR laser with the simple structure is promising as a colorless light source for the next-generation time and wavelength division multiplexed passive optical network (TWDM-PON) systems.