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.