单模光纤模场半径快速测量仪的设计及制作  

Design and fabrication of a device for quick measuring the mode-field radius of single-mode optical fibers

作　　者：杨高波[1] 徐铁峰[1] 周亚训[1] 杨燕[1] 

机构地区：[1]宁波大学光通信与网络技术研究所,浙江宁波315211

出　　处：《光通信研究》2004年第3期55-57,共3页Study on Optical Communications

基　　金：国家自然科学基金资助项目(60272034)

摘　　要：用FPGA可编程控制器来控制步进电机带动放置在光纤端面远场区域的一个透光圆孔屏障沿光轴线移动,从而调节PIN光电管接收到的光信号强度.用锁相放大器来提高光电信号的信噪比,信号被快速采样后输入FPGA控制器,经过数据处理后显示所测单模光纤的模场半径.测量仪具备较好的测量精度和重复精度.A barrier with circular-hole is placed in far-field area of a fiber, and the source light's intensity received by PIN tube is adjusted by moving the barrier along the optical anxis with a stepper motor, which is controlled by a FPGA chip. A phase-locked amplifier is used to improve the signal-to-noise ratio of photoelectricity signal, and the FPGA chip is also utilized to incept the sampling signal and calculate the mode-field radius of single-mode optical fibers quickly. The device has good measuring and repeating precision.

关 键 词：单模光纤 模场半径 测量仪 远场 锁相放大器 光电信号 FPGA控制器 设计 

分 类 号：TN818[电子电信—信息与通信工程]