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提出了一种基于大芯径塑料包层光纤的嵌入式微结构光纤器件,该结构的锥区末端具有均匀的折射率分布与光场分布。理论分析结果表明,耦合系数随着锥区直径的减小呈现指数形式增大,增大锥区的长度可以使器件的损耗减小。实验上采用固定式加热方法和移动式加热方法分别制作了这种器件,使用移动大热区拉锥系统可以使锥区的长度增大近5倍。利用波长632.8nm的He-Ne激光,测试了该器件不同长度锥区的损耗,锥区长度为0.7cm时损耗约为2.63dB,而锥区长度为3.4cm时损耗约为1.06dB,锥区长度对器件损耗的影响与理论分析一致,可以通过改进器件的结构实现低损耗传输。
An embedded microstructure optical fiber device based on large core plastic cladding optical fiber is proposed. The end of the cone has uniform refractive index distribution and light field distribution. The results of theoretical analysis show that the coupling coefficient increases exponentially with the decrease of cone diameter, and increasing the length of cone can reduce the loss of the device. Experimental use of fixed heating method and mobile heating methods were made of such devices, the use of mobile hot zone taper system can make the length of the cone area nearly 5 times. The loss of conical region with different length was tested by He-Ne laser with wavelength of 632.8nm. The loss was about 2.63dB when the cone length was 0.7cm and 1.06dB when the cone length was 3.4cm. The effect of length on device loss is consistent with the theoretical analysis, and low-loss transmission can be achieved by improving the device’s structure.