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24 November 2021 Large-mode-area multi-resonant all-solid photonic bandgap fiber with bending induced high-order-modes leakage
Xiao Chen, Liangjin Huang, Huan Yang, Yi An, Zhiping Yan, Zhiyong Pan, Pu Zhou
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Proceedings Volume 12060, AOPC 2021: Advanced Laser Technology and Applications; 1206004 (2021) https://doi.org/10.1117/12.2601634
Event: Applied Optics and Photonics China 2021, 2021, Beijing, China
Abstract
All-solid photonic bandgap fiber (AS-PBGF) has been an unrivalled platform for the effective mode area (EMA) scaling of large-mode-area fiber and the selective spectral filtering. Super-large EMA scheme assisted by the multiple resonance mechanism is also achievable while maintaining the robust single-mode (RSM) operation. In the current work, we have proposed aother modified multi-resonant AS-PBGF with some high-index nodes are replaced by the background material. By extending the multi-resonant coupling concept, a specially designed microstructural cladding, with multiresonant cores in the inner layers and leakage channels in the outermost layer, is employed to generate broadband resonance and modal dissipation of high-order-modes (HOMs) under bent configuration. Sufficient confinements on the modal distribution of fundamental mode (FM) are retained by adjusting the arrangement of Ge-doped rods in the microstructure cladding precisely, and the rotational symmetry of the proposed AS-PBGF makes it insensitive to bending direction. The missing Ge-doped rods in each layer are properly designed to stress differential bending loss between FM and HOMs with high loss ratio. Bending loss of FM less than 0.05 dB/m and high loss ratio over 200 times are always available and independent of bending direction. An EMA greater than 900 μm2 and a loss ratio up to ~ 495 can be obtained under the bending radius of 45 cm.
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Xiao Chen, Liangjin Huang, Huan Yang, Yi An, Zhiping Yan, Zhiyong Pan, and Pu Zhou "Large-mode-area multi-resonant all-solid photonic bandgap fiber with bending induced high-order-modes leakage", Proc. SPIE 12060, AOPC 2021: Advanced Laser Technology and Applications, 1206004 (24 November 2021); https://doi.org/10.1117/12.2601634
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KEYWORDS
Silica
Electronic support measures
Structured optical fibers
Germanium
Resistance
Resonance enhancement
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