日本KDD研究和发展实验室从理论上和实验上研究了1.5μm波长范围的InGaAsP/InP分布反馈式(DFB)激光器的激射特性。分析了5层DFB波导中波的传播,估算出结构参数对阈值条件的影响。在设计低阈值激光器及其激射波长方面进行了主要考虑。用液相外延方法制备了具有1.53μm发射主光栅的DFB隐埋异质结构激光器。在-20℃～58℃的温度范围内实现了CW工作。室温下的CW阈值电流低至50mA。在直流与500Mbit/s的伪随机脉冲电流 The KDD research and development laboratory in Japan has theoretically and experimentally investigated the lasing characteristics of InGaAsP / InP distributed feedback (DFB) lasers in the 1.5 μm wavelength range. The wave propagation in a five-layer DFB waveguide is analyzed and the influence of structural parameters on the threshold condition is estimated. A major consideration in designing low threshold lasers and their lasing wavelengths. A DFB buried heterostructure laser with 1.53μm emission main grating was fabricated by liquid-phase epitaxy. In the -20 ℃ ~ 58 ℃ temperature range to achieve the CW work. The CW threshold current is as low as 50mA at room temperature. In the DC and 500Mbit / s pseudo-random pulse current