Abstract:.A hollow anti-resonant fiber with nested and double cladding structure is proposed. By optimizing the structural parameters, the confinement loss reaches 4 × 10 − 4 dB / km at 1.55 μm, and the ratio of high-order mode loss to fundamental mode loss also reaches 20,000. In the O + E + S + C + L + U band, the loss is <0.01 dB / km and the ratio of high-order mode loss to fundamental mode loss is >103, indicating that the designed fiber has excellent single-mode characteristics and wide bandwidth. In a… Show more
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