CAJ | 학술논문

偏振分束器是光学中的重要器件，它将入射光按其偏振特性进行分离，它主要应用于需要对偏振态进行有效控制的光学系统中。微型化光波导偏振分束器已成为光通信领域的研究趋势。双芯光纤偏振分束器承接了双芯的特殊优势，是一类基于模式干涉的偏振分束器，根据耦合长度的不同将两种偏振态分离开来，这一类的分束器具有设计灵活、体型小、价格低廉、应用广泛等优点。本文基于椭圆芯双芯光纤，先从理论方面介绍了偏振分束的原理，再利用Rsoft软件模拟分析了x、y方向的耦合长度及其x、y方向的耦合长度差值随纤芯长短轴比例、入射光波长、纤芯包层折射率差、纤芯间归一化距离的变化趋势。最后，通过优化设计，获得了长度为22.29cm、消光比可以达到20dB以上的偏振分束器。
편진분속기시광학중적중요기건，타장입사광안기편진특성진행분리，타주요응용우수요대편진태진행유효공제적광학계통중。미형화광파도편진분속기이성위광통신영역적연구추세。쌍심광섬편진분속기승접료쌍심적특수우세，시일류기우모식간섭적편진분속기，근거우합장도적불동장량충편진태분리개래，저일류적분속기구유설계령활、체형소、개격저렴、응용엄범등우점。본문기우타원심쌍심광섬，선종이론방면개소료편진분속적원리，재이용Rsoft연건모의분석료x、y방향적우합장도급기x、y방향적우합장도차치수섬심장단축비례、입사광파장、섬심포층절사솔차、섬심간귀일화거리적변화추세。최후，통과우화설계，획득료장도위22.29cm、소광비가이체도20dB이상적편진분속기。
Polarization beam splitter is an important device in optics, it separates the incident light according to its polarization features, and is mainly used in the optical system whose polarization characteristic needs to be controlld effectively. The miniatur-ization of the polarization beam splitter has become the trend of research in the optical communication. Twin- core optical fiber po-larization beam splitter inherits the special advantage of twin-core, is a kind of polarization beam splitter based on interference pat-terns,and is according to the difference of coupling length between two different polarization of incident light.This kind of beam splitter has the characteristics of flexible design, small size, low cost, wide application, etc.Based on the twin-core optical fiber with elliptical core, this paper first introduces the principle of the polarization beam splitting from the aspects of theory. Then the variation trends of x and y polarization coupling length and their difference with the long and short axis ratio of the elliptical core, the wavelength of incident light, the refractive index difference between core and cladding, and the normalized distance are simu-lated by using the Rsoft. Through optimization designing, a polarization beam splitter with 224mm long and extinction ratio higher than 20dB is acquired.