Highly Birefringent Low Losses Hollow-Core Antiresonant Fiber

In this paper, a proposal on highly birefringent and low losses hollow core antiresonant fiber is presented and analyzed, capable of exhibiting better performances than the recent related achievements. The addition of high index layers and elliptical nesting on our optimized structure improved the birefringence by nearly one order: highest value is 2.6×10−4 at 1520 nm wavelength and maintains a birefringence level of > 1×10−4 for 100 nm bandwidth. It also achieves a lowest confinement loss of 6.33×10−3 dB/m at 1520 nm by covering a range of 200 nm within which loss remains < 1 dB/m. Moreover, the presented fiber claims very low bending loss of 9.06×10−3 dB/m at a short bend radius (6 cm) and maintains a bending loss of < 0.01 dB/m from 4 cm bend radius to onwards. Therefore, our proposed fiber, having above excellent properties, may be useful for designing future polarization controlling devices in the area of optical communication.