新型缓变锥型PCF结构接口耦合损耗特性

提出一种新型的缓变锥型光纤接口器件。该接口器件是一个长度为150mm左右的缓变锥型光子晶体光纤。利用有限元方法对模场直径差别较大的不同光纤进行拼接时的损耗问题进行研究。研究结果表明:在模场直径分别为9μm和10.4μm的光纤之间加入锥型光纤后可以有效降低耦合损耗,并且在不同波长下耦合损耗都维持在一个较低水平。因此,该接口器件能够实现光纤拼接时物理结构的过渡和不同模场直径的转换,从而使拼接损耗降到最低。

Coupling loss characteristics of the novel tapered photonic crystal fiber interface

A novel graded tapered fiber optic interface device is proposed. The interface device is a tapered graded photonic crystal fiber (PCF) about 150 mm in length. Using the finite element method, we studied the loss between different fibers with great difference in mode field diameters when they were splicing. The results showed that the coupling loss can effectively reduce after joining the tapered optical fiber between the fibers with the mode field diameter 9 m and 10.4m, and coupling losses are maintained at a low level at different wavelengths. Thus, the interface device can achieve the transition of the physical structure when the optical fibers splice and the conversion between the optical fibers with different mode field radius, thereby minimizing the splicing loss.