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在光通信中,光源与单模光纤的匹配,就需要光源为单一模式(波长)的振荡。普通的激光器产生的光是多模的,而分布反馈激光器能够产生单一模式的光振荡。因为它利用的光栅分光原理。分布反馈激光器的主要特征为在InP波导材料上制成波纹光栅。这个光栅很薄约0.1微米厚,而且光栅条数要多而均匀。约为2400条/毫米。所以对波纹光栅质量的检测就成为整个工艺中重要的问题。对波纹光栅的主要内容为:1.光栅常数的精确测量光栅常数决定了该激光单一波长的位置,必须非常准确。仔细地调整好扫描镜参数,并校验标尺。可以直接测取光栅常数值。非常直难可靠,如照片1示,光栅常数值为0.40微米,已符合光通信中1.33微米光源的设计要求。而且光栅条
In optical communications, matching a light source with a single-mode fiber requires the light source to oscillate in a single mode (wavelength). The light produced by a conventional laser is multimode, while the distributed feedback laser produces a single mode of light oscillation. Because it uses the principle of grating spectroscopy. The main feature of distributed feedback lasers is the formation of a corrugated grating on the InP waveguide material. This grating is very thin about 0.1 microns thick, and the grating number should be more and more uniform. About 2400 / mm. Therefore, the detection of the quality of the corrugated grating has become an important issue in the entire process. The main contents of the corrugated grating: 1. Accurate measurement of grating constant grating constant determines the position of a single wavelength of the laser must be very accurate. Carefully adjust the scanner parameters, and check the ruler. The grating constant can be measured directly. Very straightforward and reliable, as shown in photo 1, the grating constant is 0.40 μm and meets the design requirements for a 1.33 μm light source in optical communications. And the grating bar