多通道干涉大范围可调谐半导体激光器是波分复用系统中的新型关键器件，设计了一套针对此激光器高精度电流注入、温度控制、波长锁定等问题的控制系统。将该激光器的整套控制方案集成单板。在该控制系统下，测试得到激光器输出波长在1 524~1 572 nm中每间隔0.4 nm的120个ITU标准波长光谱图，调谐范围超过48 nm，并且在整个调谐范围内，边模抑制比超过了45 dB，波长偏差与ITU标准波长相差小于±10 pm，线宽小于100 kHz。

We propose a design of single-mode orbital angular momentum (OAM) beam laser with high direct-modulation bandwidth. It is a microcylinder/microring cavity interacted with two types of second-order gratings: the complex top grating containing the real part and the imaginary part modulations and the side grating. The side grating etched on the periphery of the microcylinder/microring cavity can select a whispering gallery mode with a specific azimuthal mode number, while the complex top grating can scatter the lasing mode with travelling-wave pattern vertically. With the cooperation of the gratings, the laser works with a single mode and emits radially polarized OAM beams. With an asymmetrical pad metal on the top of the cavity, the OAM on-chip laser can firstly be directly modulated with electrical pumping. Due to the small active volume, the laser with low threshold current is predicted to have a high direct modulation bandwidth about 29 GHz with the bias current of ten times the threshold from the simulation. The semiconductor OAM laser can be rather easily realized at different wavelengths such as the O band, C band, and L band.