基于熔融拉锥光纤对光纤传输耦合效率影响的研究

发布时间：2018-03-06 21:00

本文选题：拉锥光纤　切入点：传输耦合效率　出处：《南京邮电大学》2015年硕士论文　论文类型：学位论文

【摘要】：光纤端面形状对光纤耦合的相关指标影响较大。光纤传输系统的速率越高,反射光对系统的影响越大。反射光会沿着光纤反馈到系统的激光器光源中,引起系统的不稳定和噪声,使得光纤系统的传输信息不可靠。因此我们提出通过拉锥将光纤端面制成曲面,而锥体曲面与光纤系统匹配,可以与光纤线路进行低损耗连接,具有极低的后向反射,得到更高的回波损耗。首先从理论方面进行研究,利用BPM进行软件仿真,对不同形状拉锥光纤对光路输出光功率数据进行比较分析,即得到拉锥光纤对光路传输耦合效率的影响,分析得到当拉锥光纤锥头尺寸为锥头包层长度是80μm,纤芯长度是60μm时,此时的拉锥光纤的传输耦合效率最佳。其次从实验实践方面进行研究,基于光纤熔接机的熔接功能,在放电熔融时使夹具反向移动,使光纤在熔融状态下获得径向拉力,可以改变光纤径向尺寸分布,光纤平端面可形成具有一定锥体的曲面。本文测量了不同放电时间和放电强度条件下,相应形成的光纤端面的插入损耗和回波损耗值,并与光纤平端面对比,得到插入损耗最佳值为0.9dB,回波损耗可达到36dB,并通过测试和分析,我们首次提出耦合损耗随耦合端面距离改变的变化规律的结论。
[Abstract]:The higher the rate of optical fiber transmission system, the greater the influence of reflected light on the system. The reflected light will be fed back to the laser light source of the system along the fiber. Because of the instability and noise of the system, the transmission information of the optical fiber system is unreliable. Therefore, we propose that the end surface of the fiber can be made into a curved surface by pulling the cone, and the cone surface can be connected with the fiber line with low loss by matching the surface with the optical fiber system. With very low backward reflection, higher echo loss can be obtained. Firstly, the theoretical research is carried out, and the different shape tapered fiber is compared with the output optical power data by BPM software simulation. The effect of tapered fiber on optical transmission coupling efficiency is obtained. The results show that when the size of tapered fiber cone head is 80 渭 m, the core length is 60 渭 m. The transmission coupling efficiency of tapered fiber is the best at this time. Secondly, from the aspect of experimental practice, based on the fusion function of fiber fusion machine, the jig moves backward during discharge melting, which makes the fiber obtain radial pull force in molten state. The radial size distribution of the fiber can be changed, and the flat end face of the fiber can form a curved surface with a certain cone. In this paper, the insertion loss and echo loss value of the corresponding fiber end face are measured under different discharge time and discharge intensity. Compared with the flat end face of the fiber, the optimal insertion loss is 0.9 dB, and the return loss can reach 36 dB. By testing and analyzing, we put forward for the first time a conclusion that the coupling loss changes with the distance of the coupling end face.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN253

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