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Using beam propagation method(BPM), key optical design parameters of InP/AlGaInAs multiple quantum well(MQW) ring laser were numerically analyzed. The influences of waveguide dimensions, curvature radius and gap size on the coupling efficiency were discussed. An InP/AlGaInAs MQW ring laser with radius of 350 μm was designed and realized. The experimental results show that the designed device, lasing at 1 563.2 nm with side mode suppression ratio higher than 20 dB, exhibited unidirectional bistability between the clockwise and counterclockwise modes. 相似文献
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在地理教学中，教师巧用多媒体教学，通过创设声音、图像、动画、影视素材、幻灯片、flash动画等情境。新课程的核心理念是关注人——“一切为了每一位学生的发展”。孔子说过：知之者莫若好之者，好之者莫若乐知者。而使用多媒体进行地理教学过程则应该是一种愉悦的情绪和积极地情感体验，可以让学生在情境中体验，感受课堂的快乐。 相似文献
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