Modal interferometer sensor optimized for transverse misalignment

TL;DR

This paper investigates how transverse misalignment affects the transmission and power in an SMS fiber sensor, revealing optimal misalignment conditions and temperature effects through numerical simulations.

Contribution

It introduces a detailed analysis of transverse misalignment effects on SMS sensor transmission using finite element modeling, highlighting optimal misalignment for maximum transmission.

Findings

Maximum transmission occurs at non-zero misalignment due to excited modes.

Transmitted power is significantly affected by temperature only when aligned.

Finite Element Method effectively models mode distribution in misaligned sensors.

Abstract

We study the transmission coefficient and the transmitted power through an SMS sensor with transverse misalignment. We use the Finite Element Method to calculate the modes distribution by numerically solving the wave equation. The results show that the maximum transmission can be obtained when the misalignment is greater than zero due to the $n \neq m$ LP$_{nm}$ excited modes. Additionally, the transmitted power as function of the temperature shows that it is significant only in the aligned case.