Author Affiliations
Abstract
1 Institute of Lightwave Technology, Beijing Jiaotong University, Beijing 100044, China
2 Key Laboratory of All Optical Network and Advanced Telecommunication Network of Ministry of Education, Beijing Jiaotong University, Beijing 100044, China
In a D-shaped twin-core fiber (DTCF), the central core is insensitive to the variation of the external environment, while the other core is highly sensitive. As an electro-optic polymer coated on a DTCF, the coupling between the two cores varies with voltages applied to the polymer. Based on this, a superior all-fiber modulator is proposed that bears little coupling loss, prohibits mode mismatch, and provides a more stable working circumstance. A half-wave driving voltage (Vπ) of 1.26 V is achieved. Moreover, a high modulation depth of 40 dB can be realized for a voltage of 2.7 V at a 1550 nm wavelength.
060.2310 Fiber optics 060.4080 Modulation Chinese Optics Letters
2016, 14(10): 100603
Author Affiliations
Abstract
Key Lab of All Optical Network and Advanced Telecommunication Network of Ministry of Education, Institute of Lightwave Technology, Beijing Jiaotong University, Beijing 100044, China
A high sensitivity magnetic fluid (MF) filled side-hole fiber magnetic field sensor based on surface plasmon resonance (SPR) is designed and investigated. Within the side-hole fiber, the water-based MF is injected into the two side holes, and both of the holes are coated with gold to realize the measurement of the magnetic field by using the SPR effect. The refractive index of the MF changes with different external magnetic fields, resulting in the resonant wavelength moving to other wavelengths. Furthermore, when the external magnetic field increases from 30 to 210.9 Oe, the magnetic field sensitivity can reach to 1.063 nm/Oe.
240.6680 Surface plasmons 060.2370 Fiber optics sensors 160.3820 Magneto-optical materials Chinese Optics Letters
2016, 14(11): 110603
1 北京交通大学全光网络与现代通信网教育部重点实验室, 北京 100044
2 北京交通大学光波技术研究所, 北京 100044
光纤激光传感系统作为一种新型的光纤传感技术，结合了光纤传感的高灵敏度、可分布式测量和不易受电磁干扰等优点，以及光纤激光器的窄线宽和高光信噪比等优势，能够很好地应用于油田、矿山、桥梁、电力以及飞机等领域的测量和安全监控。从两个方面介绍了目前光纤激光传感系统的研究进展，一方面是基于单参量测量的光纤激光传感系统，系统所探测的参量包含了温度、应变、折射率、电流、声波和风速等；另一方面是基于双参量测量的光纤激光传感系统，主要是解决温度与横向应力、应变和折射率等交叉敏感的问题。
传感器 光纤传感 光纤激光器 单参量测量 双参量测量
北京交通大学 光波技术研究所, 北京 100044
电光调制器作为光通信系统中最重要的器件之一, 其性能决定了光通信系统的传输性能, 而电光调制器的电极结构、种类和设计都对调制器的性能有重要的影响。针对基于光纤布拉格光栅(FBG)的新型电光调制器电极展开了研究和设计, 并通过数值计算方法, 对模场重叠因子、电极结构参数以及模场重叠因子和FBG中心波长漂移量 的关系做了讨论, 并由此对基于FBG的聚合物电光调制器的电极做了一系列的分析和研究。文中的研究对基于FBG的电光调制器的制作具有一定的指导意义, 能够促进电光调制器的发展。
电光调制器 电极结构 中心波长漂移量 模场重叠因子 electro-optic modulator structure of electrode central wavelength shift overlap of mode field 红外与激光工程
2016, 45(5): 0520003
北京交通大学 全光网与现代通信网教育部重点实验室, 北京 100044
将相移光纤光栅(PSFBG)有机聚合物相结合, 利用相移光纤光栅的窄带透射峰特性, 设计了一种D型结构的全光纤电光调制器, 并对其进行理论分析。主要研究了聚合物到纤芯中心的距离、聚合物厚度以及聚合物折射率对相移光纤光栅中心波长漂移量的影响, 分析了高频调制电压下相移光纤光栅的传输谱的变化。研究结果表明, 通过选择合适参数, 当聚合物折射率变化为10-4时, 中心波长漂移量可以达到10-2 nm; 同时, 高频电压调制下, 相移光纤光栅传输谱的形状以及中心波长还会受光栅长度和调制频率的影响。
电光调制器 有机聚合物 相移光纤光栅 中心波长漂移 electro-optic modulator organic polymer phase-shifted fiber Bragg grating (PSFBG) center wavelength-shifted (Δλ)
