第21卷
第4期
2013年4月
1004-924X(2013)040884-05
文章编号
光学精密工程
Optics and Precision Engineering
基于内壁芯光纤的调制器件赵恩铭，郑瑶，刘岩鑫，苑立波，修成国，杨兴华“（哈尔滨工程大学理学院，黑龙江哈尔滨150001)
Vol. 21No. 4
Apr.2013
摘要：提出一种基于中空内壁悬挂芯光纤构造面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Fe;O。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。磁流体通过修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人、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-μL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38914A/m时，饱和调制深度为43%；系统的响应时间低于120
ms。该系统还可用于光开关，光纤滤波器和磁传感器等。关键词：内壁纤芯；光纤调制器；磁场；磁流体
中图分类号：TN253
文献标识码：A
doi:10. 3788/OPE. 20132104. 0884
Modulator device based on optical fiber with core on inner wall
ZHAOEn-ming,ZHENGYao,LIUYan-xin,YUANLi-bo,
TONGCheng-guo，YANGXing-hua
(Collegeof Science,HarbinEngineeringUniversity,Harbin1500l,China)
Correspondingauthor,E-mail:yangrh@hrbeu.edu.cn
Abstract: A fiber integrated modulator is proposed based on a new kind of optical fiber with a fiber core on the inner wall. This optical fiber has a pore structure and its core is suspended on the inner wall of the pore. The magnetic fluid containing super paramagnetic Fe O, nanoparticles is synthe sized, then it is encapsulated in the hollow optical fiber through molten connecting with a multimode optical fiber 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 X 102 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 light switches, optical fiber filters and magnetic sensors.
Key words: fiber core on inner wall; optical fiber modulator; magnetic field;magnetic fluid
收稿日期：2012-10-17；修订日期：2012-11-28.
基金项目：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