Open AccessWideband, large mode field and single vector mode transmission in a 37-cell hollow-core photonic bandgap fiber
Author(s) -
Yong You,
Huiyi Guo,
Yundong Hao,
Zhi Wang,
Yange Liu
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.431701
Subject(s) - materials science , optics , single mode optical fiber , cladding (metalworking) , photonic crystal fiber , wideband , mode field diameter , transmission loss , bend radius , bandwidth (computing) , equilibrium mode distribution , optical fiber , insertion loss , optoelectronics , wavelength , radiation mode , plastic optical fiber , multi mode optical fiber , physics , telecommunications , bending , computer science , metallurgy , composite material
Stable generation and propagation of ultrafast high-order mode beams has become an important research direction. A core diameter not more than 10 times the wavelength is regarded as the upper limit for single mode transmission. However, a high-power laser requires a core diameter 20 to 40 times the wavelength to achieve high-power and stable output, which exceeds the design limit of the traditional fiber. In this paper, a novel 37-cell hollow core photonic bandgap fiber (HC-PBF) that only supports pure TE 01 mode over a bandwidth of 50 nm with the lowest loss of 0.127 dB/km is proposed. The HC-PBF has a core diameter of more than 40 μm. Single mode guidance is achieved by adjusting the lattice size in a particular of the cladding. The best single mode performance with a loss ratio as high as 150,000 between TE 01 mode and other modes with minimum loss is obtained. The fiber also has low bend-loss and thus can be coiled to a small bend radius of 1 cm having 1.6 dB/km bend loss. The tunability of the single-mode window and the manufacturing feasibility of the proposed fiber are also discussed.