氟化梯度折射率塑料光纤带宽特性计算  

Calculation of bandwidth characteristics of perfluorinated graded-index polymer optical fiber

作　　者：苗圃[1] 吴乐南[1] 

机构地区：[1]东南大学信息科学与工程学院,南京210096

出　　处：《东南大学学报（自然科学版）》2013年第3期467-472,共6页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(61271204)

摘　　要：基于氟化聚合物梯度折射率圆对称塑料光纤(PF-GIPOF)的传输参量计算,分析其传输特性,推导出频域基带功率传输函数,得到一种参数完整的色散计算模型.理论分析了光源特性、模式时延和模式损耗对带宽的影响并对色散进行拟合和计算.在波长和激光斑半径相异的光源激励下,对不同长度、不同折射率指数的PF-GIPOF的频率响应进行仿真验证.理论计算和实验结果表明,200 m长的PF-GIPOF在1 300 nm工作波长下,半径11.76μm的激光斑激励出的传导模最少,由于差分模式损耗作用,系统带宽提升了3.56 GHz,在α=2.16的折射率下可以得到最大的带宽优化.该计算模型可有效地用于PF-GIPOF通信系统的参量选取和带宽预测.According to the transmission parameters calculation of perfluorinated graded-index polymer optical fiber（PF-GIPOF）,the transfer characteristic is analyzed.The baseband power transfer function and a full dispersion model are derived.The optical source,modal delay and loss,which affect the determination of the total bandwidth,are analyzed;the dispersion is approximated and calculated.The frequency responses with different fiber lengths and refractive indices are simulated in the excitation of light source with different wavelengths and spot radii.The theoretical analysis and experimental results show that the baseband bandwidth is enhanced by 3.56 GHz in 200 m PF-GIPOF with a wavelength of 1 300 nm mainly due to strong differential mode attenuation;besides,the laser with 11.76 μm beam spot radius can excite the least modes and the bandwidth is optimized with a refractive index exponent of 2.16.The dispersion computational model is beneficial to the optical source and fiber parameters selection and the bandwidth prediction of the PF-GIPOF communication system.

关 键 词：塑料光纤 带宽 梯度折射率 传输函数 色散 

分 类 号：TN929.11[电子电信—通信与信息系统]