Anti-resonant hollow-core fibers featuring segmented interior cavities and nested anti-resonant structures

An optical fiber comprising:

• a cladding structure extending along a fiber length providing a hollow interior fiber region;
• and
• a plurality of anti-resonant (AR) elements distributed within the hollow interior fiber region, each of the plurality of AR elements formed as walled structures with walls extending along the fiber length, wherein at least some of the plurality of AR elements are nested to form one or more nested sets of AR elements, wherein at least one of the nested sets of AR elements comprises a first AR element of the plurality of AR elements, wherein an interior region of the first AR element is segmented into two or more interior cavities by one or more segmentation walls extending along the fiber length, wherein at least one of the two or more interior cavities of the first AR element includes two or more second AR elements of the plurality of AR elements, wherein the plurality of AR elements is configured to guide light along the fiber length at least partially within the hollow interior fiber region based on optical antiresonance.