嵌入式系统在光纤识别仪中的应用

Application of embedded system on optical fiber identifier

随着光纤通信的快速发展,对光纤通信的测试也提出了各种要求.为了在不影响光纤正常通信的情况下对光纤进行在线检测,提出了如下的解决方案:由于光纤弯曲时光线不满足全反射的条件,有光线泄漏出来,而这些光线具有光纤中传输信号的特征,我们根据光纤弯曲的理论在不影响光纤通信的条件下给光纤施加适当的弯曲,并由此设计合理的光检测器结构和放大电路,利用嵌入式系统为硬件支撑,研制出光纤识别仪.该仪器能够通过对光检测器检测到的光纤泄漏光信号进行分析,在不中断通信的情况下对光纤进行检测,识别其中的信号.在实际应用当中显示了良好的性能.

With rapid development of optical communications, various types of requirements are in demand on detecting optical communications. In view of the above, this paper gives a solution as below in order to on-line detect the optical fiber without affecting the normal optical communications. Since the optical light won＇t fellow the condition of total internal reflection when optical fiber is bended, some of optical lights are leaked from optical fiber, and these lights contains the features of the signal transmitting in the fiber. According to the theory of optical fiber bending, proper bending is made on the optical fiber without affecting normal optical communications. On these grounds, the structure and the amplifier circuit for a suitable optical detector are designed. At the same time using embedded systems as hardware support. Finally, a device called optical fiber identifier is developed. With this device an optical signal of optical fiber leakage detected by the optical detector can be analysed and identified through the detection of optical fiber without interrupting the communications. This device shows good performance during the practical application.