We report the fabrication of widely tunable ridge waveguide distributed Bragg reflector (DBR) lasers with InGaAsP butt-joint as grating material. The shape of the butt–joint interface is found to have significant effect on the properties of the lasers. It is shown that irregular mode jumps during wavelength tuning can be avoided by a V-shaped butt–joint interface. From the fabricated device, 23 channels with 0.8 nm spacing and greater than 35 dB side mode suppression ratios are obtained. The different tuning characteristics of the ridge waveguide and the previously reported buried ridge stripe DBR lasers are discussed. Combined with the wide tuning range and the simple structure, the ridge waveguide DBR lasers are promising for use in wavelength division multiplexing passive optical networks (WDM-PONs).

采用选择区域外延生长技术和对接再生长技术，设计并制作了10信道分布反馈激光器阵列与多模干涉耦合器的单片集成器件。器件中采用了新的技术，集成了钛薄膜热电阻用于波长调谐。集成器件烧结到热沉上后，在25 ℃温控条件下测试，激光器阵列的平均信道间隔为1.29 nm，阈值电流为22~30 mA；当激光器注入电流为200 mA，各信道的平均出光功率为0.5 mW。集成热电阻的调谐效率约为5 nm/W,通过施加合适的热电流调谐,该集成器件可以覆盖34路信道间隔为50 GHz的波长范围。集成器件可单波长选择输出，也可10信道同时运作合波输出。

Selective area growth (SAG) is performed to fabricate monolithically integrated distributed feedback (DFB) laser array by adjusting the width of a SiO2 mask. A strain-compensated-barrier structure is adopted to reduce the accumulated strain and improve the quality of multi-quantum well materials. Varying the strip width of the SAG masks, the DFB laser array with an average channel spacing of 1.47 nm is demonstrated by a conventional holographic method with constant-pitch grating. The threshold current from 14 to 18 mA and over 35-dB side mode suppression ratio (SMSR) are obtained for all DFB lasers in the array.