基于内壁芯光纤的调制器件  

Modulator device based on optical fiber with core on inner wall

作　　者：赵恩铭[1] 郑瑶[1] 刘岩鑫[1] 苑立波[1] 佟成国[1] 杨兴华[1] 

机构地区：[1]哈尔滨工程大学理学院,黑龙江哈尔滨150001

出　　处：《光学精密工程》2013年第4期884-888,共5页Optics and Precision Engineering

基　　金：国家自然科学基金资助项目(No.61007053);国家教育部博士点基金资助项目(No.20092304120022);中央高校基础科研业务费专项资金资助项目

摘　　要：提出一种基于中空内壁悬挂芯光纤构造而成的光纤集成调制器。该光纤具有孔道结构,纤芯悬挂于孔道内壁。合成了含有超顺磁性Fe3O4纳米颗粒的磁流体,通过将空心光纤与多模光纤熔融连接,将磁流体封装在空心光纤内部,作为悬挂纤芯的包层。磁流体通过倏逝场对光产生吸收作用,由外磁场控制吸收强度,实现对纤芯的光调制。波长为632.8nm的光经过拉锥耦合点耦合进入、传出调制元件。实验结果表明,在不同磁场强度下,仅仅2.0×10-2μL的磁流体就可以对系统光衰减产生明显影响。当磁场强度为38 914A/m时,饱和调制深度为43%;系统的响应时间低于120ms。该系统还可用于光开关,光纤滤波器和磁传感器等。A fiber integrated modulator is proposed based on a new kind of optical fiber with a fiber core on wall of sized, t optical he inner wall. This optical fiber has a pore structure and its core is suspended on the inner he pore. The magnetic fluid containing super paramagnetic Fe3O4 nanoparticles is synthe- en it is encapsulated in the hollow optical fiber through molten connecting with a multimode ber and used as the cladding of the fiber core. By an evanescent field, the magnetic fluid gen- erates absorption effect on the light and its intensity is controlled by an external magnetic field, so that the light modulation is implemented. Moreover,the light at a wavelength of 632.8 nm is coupled in and out of the modulating element by tapering the coupling point. The experimental results show that only 2.0 ×10-2 μL of the magnetic fluid in the system can significantly impact the optical attenu- ation under different magnetic field strengths. When the magnetic field strength is 38 914 A/m , the saturation modulation depth is 43 %, and the system response time is below 120 ms. The system can also be used in li switches, optical fiber filters and magnetic sensors

关 键 词：内壁纤芯 光纤调制器 磁场 磁流体 

分 类 号：TN253[电子电信—物理电子学]