Reflected intensity noise owing to offset coupling in case of excitation of triangular index fiber through upside down tapered cylindrical microlens on the end face of the fiber

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Theoretical framework estimates reflected intensity noise and coupling efficiency in optical fibers, indicating design improvements.

Increased lateral mismatch results in higher reflected intensity noise and lower coupling efficiency, affecting performance.
The study demonstrates an analytical method using ABCD matrix formalism to evaluate key metrics of the coupling system.
Results indicate that reflected intensity noise poses significant challenges for optical communication, especially with specific fiber configurations.
The findings are relevant for designers working on optical couplers to enhance performance through better alignment methods.

Lahiri et al. (2025) studied this question.

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