講演情報
[9p-E219-8]Nonlinearity-Induced Exceptional Point Dynamics in a Tapered Passive–Lossy Dual-Core Optical Fiber
〇(D)Asit Das1, Bishnu. P Pal1, Somnath Ghosh1 (1.Mahindra Univ.)
キーワード：
Exceptional point、Nonlinearity、Tapering
Exceptional points (EPs) are unique non-Hermitian degeneracies at which both eigenvalues and eigenvectors simultaneously coalesce. These singularities have attracted considerable interest in photonics because of their remarkable applications in enhanced sensing, optical switching, and mode manipulation. Optical structures with asymmetric gain–loss distributions provide an effective platform for investigating EP-assisted light propagation and modal interactions. In addition, Kerr nonlinearity introduces an intensity-dependent refractive index change, offering an extra degree of freedom for controlling light dynamics. In this work, we investigate the influence of Kerr nonlinearity on the modal characteristics and EP behavior of a tapered passive–lossy dual-core optical fiber. The nonlinear refractive index perturbation modifies the effective refractive index and coupling strength of the supported modes, resulting in an intensity-dependent shift of the EP from its linear operating point. This interplay between non-Hermiticity and nonlinearity enables dynamic EP tuning and offers new opportunities for reconfigurable photonic devices, including all-optical switching, sensing, and adaptive mode-control applications.