Abstract
Recent advancement of low loss, broad bandwidth, high damage-threshold hollow-core anti-resonant fiber (HC-ARF) [1] has attracted a great amount of interests in optical researches. To achieve merit features of the lab-on-a-fiber applications, HC-ARF must have sufficient polarization maintaining capability. However, on one hand, in hollow-core fiber, mechanical stress induced birefringence voids; on the other hand, different from hollow-core bandgap fiber that can utilize surface mode to achieve high birefringence [2], HC-ARF does not allow any core mode to substantially overlap with glass, making it difficult to attain large birefringence from geometric asymmetry. In this work, we theoretically design a HC-ARF that can overcome this limitation.
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