基于非对称双芯光子晶体光纤的宽带定向耦合器研究

A novel broadband directional coupler based on an asymmetric dual-core photonic crystal fibet(PCF)is proposed.The asymmetry in the fiher is introduced by the enlargement of one air-hole in dual-core PCF.Numerical investigation demonstrate that broadband directional coupling with spectral width as large as 370 nm and polarization-dependent loss and uniformity lower than 0.2 and 0.5 dB,respectively,can be achieved.In addition,the proposed fiber shows large tolerance to the variation of the fiber parameters.In particular,the fiber length allows at least 10%derivation from the proposed fiber length of 7.7 mm.     

Design of a Surface-Plasmon-Resonance Sensor Based on a Microstructured Optical Fiber with Annular-Shaped Holes

A novel design is proposed for highly sensitive surface-plasmon-resonance sensors. The sensor is based on a microstructured optical fiber with two layers of annular-shaped holes. A gold layer is deposited on the inner surface of the second hole-layer, in which the holes have several micrometers thickness in size, facilitating analyte infiltration and metal layer deposition. In the first layer of holes, the sector-ring~shaped arms, used as supporting strips, are utilized to tune the resonance depth of the sensor. Numerical results indicate that the sensor operation wavelength can be tuned across the C＋L-band. The spectral sensitivity of 1.0.104 nm. RIU-1 order of magnitude and a detection limit of 1.0.10-4 RIU order are demonstrated over a wide range of analyte refractive index from 1.320 to 1.335.     

光信息科学与技术专业软件教学方法探索

针对光信息专业的相关专业软件教学方法进行了探讨,分析了不同教学体系、课程教学方法、考核方式的教学效果,提出了基于实践与综合教学的软件教学体系与方法,并对实践环节和考核方式等方面进行了改革和实践,提高了学生的学习兴趣、分析和解决问题的能力,效果良好。     

光信息科学与技术专业软件教学方法探索

针对光信息专业的相关专业软件教学方法进行了探讨,分析了不同教学体系、课程教学方法、考核方式的教学效果,提出了基于实践与综合教学的软件教学体系与方法,并对实践环节和考核方式等方面进行了改革和实践,提高了学生的学习兴趣、分析和解决问题的能力,效果良好。     

基于磁流体包覆微纳光纤布拉格光栅的磁场传感特性研究

提出了一种基于磁流体包覆的微纳布拉格光纤光栅的磁场传感器。采用氢氧焰熔融拉锥和紫外光曝光的方法制作了具有不同直径的基于微纳光纤的布拉格光栅,随着光纤直径的减小,其有效折射率对环境折射率变化的灵敏度随环境折射率的增大而非线性增大,但损耗也随之增加。实验结果表明,被磁流体包覆的直径为9.24μm的微纳布拉格光纤光栅,在0 mT～40 mT和40 mT～160 mT磁场范围内,分别获得了36.2 pm/mT和3.6 pm/mT的波长灵敏度以及81.15%和94.83%的线性拟合度。     

低弯曲损耗少模光纤传输特性研究

提出一种采用少模阶跃光纤与单模光纤连接的方法,实现低弯曲损耗传输的新型光纤通信系统。采用有限元法研究了在模场直径相同的情况下少模光纤纤芯半径与折射率差的关系,以及不同参数下光纤的弯曲损耗;采用光束传播法计算了少模光纤的各种模式与普通单模光纤的基模的连接损耗。证明了采用少模光纤可以利用模式间的正交性实现有效的单模传输,并具有低的弯曲损耗和连接损耗。