Abstract
Abstract As per bulk-edge correspondence, the junction between two topologically distinct lattices in a topological optical fiber supports topological interface states, which enable highly stable, scattering-free, robust propagation of light. We investigate the propagation characteristics of a multi-channel topological optical fiber having co-existing multiple topological interface states in the presence of potential structural defects and deformation in shape. The tolerance analysis has been carried out by deliberately introducing structural imperfections upto ≤ 4% with reference to the annular area at the topological junction of trivial and non-trivial lattices. These studies demonstrate robust properties of multiple topological interface states despite the presence of such structural deformations. Furthermore, a deliberately introduced lateral misalignment upto a maximum of 800 nm of the topological junction exhibits a low splice loss of 0.3 dB and high confinement properties of the multiple topological interface states. These results clearly indicate that the propagation characteristics and properties of the co-existing multiple topological interface states exhibit exceptional tolerance to structural defects, junction deformations, and lateral misalignments, surpassing the performance of state-of-the-art conventional optical fibers. Hence, topological optical fibers could outperform conventional optical fibers in terms of undistorted signal transmission irrespective of fabrication-related potential structural defects.
Published Version
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