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以高质量的LiNbO3晶体为衬底,采用离子注入技术制备出低损耗的LiNbO3光波导。测试了其背散射谱,并对相应的结果做了分析,为解决光波导的横向扩散问题提供了一条可行途径。 相似文献
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It is believed that gel spun polyethylene(PE)fibers have a somewhat extended chain crystalstructure,because of the disentangling of the chains which takes place in semi-dilute solutionand the ultra high draw ratio used.Ten years ago,PE shish-kebabs grown from dilute solutionwere proved to have extended chain backbone which causes the raising of its melting point.These crystals were found to have a triclinic crystal phase,This study shows a different result forgel spun ultra high drawn PE fiber.The unit cell remains orthorhombic even if the draw ratioreaches 50;as the draw ratio increases,the length in a and b axes are shortened while that in c ax-is changes quite insignificantly.When the draw ratio is over 10,two endothermic melting peakscan be seen in the DSC curves with corresponding peak temperature of 136.7-145.3℃.The lat-ter peak is attributed to the amount of extended chain crystal. 相似文献
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提出了一种新型的用作解复用器的阵列波导光栅(AWG),采用自聚焦平板波导和普通的透镜作为输入和输出平板波导,用圆柱形阵列波导代替以前的方形波导。对整个器件进行了理论分析和数值仿真,并对器件的结构进行了优化,验证了设计的可行性。 相似文献
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分析了光纤拉曼放大器(FRA)双瑞利散射(DRS)噪声特性;给出了噪声在拉曼光纤中的传输模型,基于噪声功率分析,得到了信号瑞利散射噪声功率之比和功率代价的表达式,信号的DRS和原信号一起到达接收机,导致交调,使接收机的灵敏度降低。 相似文献
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本文介绍了交流电压标准源的电路原理和主要电路,以及提高性能指标的措施。 相似文献
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