Low Loss Triple Cladding Antiresonant Hollow Core Fiber

In this paper, an antiresonant hollow core fiber, having a triple cladding arrangement, is presented. The addition of a third cladding ring in an optimized geometry leads to three orders of loss reduction compared to the double cladding ring fibers resulting in lowest leakage loss of 5.82×10−5 dB/km at 1.06 μm wavelength. The fiber also exhibits an excellent single mode performance with the maximum higher order mode extinction ratio of 106 and relatively low bending loss of 9.00×10−4 dB/km while the bend radius is 14 cm. Therefore, the presented fiber may have possible applications in high power laser delivery.