PT-symmetry breaking in dual-core phosphate-glass photonic crystal fiber

Mattia Longobucco; Le Xuan T. Tai; Viet Hung Nguyen; Jaroslaw Cimek; Ryszard Buczynski; Marek Trippenbach

doi:10.1117/12.2691197

9 March 2024 PT-symmetry breaking in dual-core phosphate-glass photonic crystal fiber

Mattia Longobucco, Le Xuan T. Tai, Viet Hung Nguyen, Jaroslaw Cimek, Ryszard Buczynski, Marek Trippenbach

Proceedings Volume PC12882, Optical Components and Materials XXI; PC1288204 (2024) https://doi.org/10.1117/12.2691197
Event: SPIE OPTO, 2024, San Francisco, California, United States

Abstract

We studied numerically 1000 nm, 1 ps pulse width propagation in a PT-symmetric nonlinear directional coupler in the form of dual-core photonic crystal fiber. The base material of the fiber is phosphate glass, while gain and loss channels are implemented by ytterbium-based and copper-based doping, respectively. The propagation models were based on coupled generalized nonlinear Schrödinger equations solved with the Split-Step method: 1) extended model including coupling coefficient dispersion, self-steepening nonlinearity and its spectral dependence, stimulated Raman contribution, cross-phase modulation and Gaussian-like gain and loss coefficient frequency function; 2) simplified model with second-order dispersion term, linear coupling and first-order nonlinearity. We predicted two states of light propagation: 1) linear pulse energy oscillation between gain and loss channels (PT-symmetry state) at 100 pJ; 2) retention of the pulse in the excited gain channel (broken PT-symmetry) at 445 pJ. The presented results open perspective on the demonstration of fiber-based all-optical switching devices.

Conference Presentation

Citation Download Citation

Mattia Longobucco, Le Xuan T. Tai, Viet Hung Nguyen, Jaroslaw Cimek, Ryszard Buczynski, and Marek Trippenbach "PT-symmetry breaking in dual-core phosphate-glass photonic crystal fiber", Proc. SPIE PC12882, Optical Components and Materials XXI, PC1288204 (9 March 2024); https://doi.org/10.1117/12.2691197

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