Fabrication of quantum well lasers with intraloss modulator for generating highly, ultrashort optical pulse

随着人类信息社会的进步，大容量、高速率的数据传输光系统的作用将更加重要。对于这一目的，短光脉冲传输系统和相干光通信系统都是很有前途的。具体地，可以将短光脉冲通信系统作为本传输系统的扩展来研究。因此，在这十年中，短光脉冲通信系统比相干通信系统更具实用性。然而，在现阶段，产生短光脉冲的技术还没有建立起来。实际上，锁模系统需要外部反射镜，并且增益开关需要高功率。在这个研究项目中，我们用单片集成的调制器和超快的光逻辑电路Un…制作了一台砷化镓量子阱激光器更多的Iform和局部泵浦光束。首先，为了建立集成量子阱激光器的制备技术，对制备工艺进行了优化，并在表20-30PSEC光脉冲产生中获得了成功。此外，通过改变调制器部分的外加电压，我们证明了波长是可以控制的。我们还研究了两段式分布反馈激光器，并在量子井激光器中实现了局域和均匀两种泵浦光束的超快逻辑运算。该器件实现了AND和NOR门操作，开关速度为10PSEC。综上所述，我们研究了具有单片集成调制器的GaAs型量子阱激光器，论证了其可行性。此外，还在量子井激光器中实现了均匀抽运和局域抽运的超快光逻辑电路。这些器件对于未来的高速光传输系统和光信息系统是有用的。较少

The role of large capacity and high speed data transmission optical systems will be more important with the progress of the information human society. For this prupose, the short optical pulse transmission system is promising as well as the coherent optical communication system. In particular, the short optical pulse communication system can be investigated as an extension of the present transmission system. Therefore, the short optical pulse communication system is more practical compared to the coherent communication system within these ten years. However, at present stage, the techique to generate short optical pulses has not been established. In fact, the mode locking system requires external mirrors and the gain switching needs high power. On the other hand, the Q-swicthing is promising to overcome those problems.In this research program, we fabricated a GaAs quantum well laser with a monolithically integrated modulator and, in addition, an ultrafast optical logic circuit using un … More iform and local pumping optical beams. First, to establish fabrication technique for the integrated quantum well lasers, the fabrication processes are optimized and succeeded in a table 20-30 psec optical pulse generation. In addition, by changing the applied voltage at the modulator section, we demonstrated the wavelength can be controlled. A distributed feedback laser with the two-section was also investigated.We also fabricated an ultrafast logic operation with two kinds of pumping beam, local and uniform beam in the quantum well lasers. The AND and NOR gate operation were achieved in the device with a switching speed of 10 psec. This type of devices leads to future all optical logic circuit systems.In summary, we investigated the GaAs quantum well laser with a monolithically integrated modulator, demonstrating its feasibility. In addition, the ultrafast optical logic circuit using uniform and local pumping optical beams was demonstrated in the quantum well lasers. These devices are useful for future high speed optical transmission systems and optical information systems. Less