Multimode fiber based high-dimensional light analyzer

TL;DR

This paper introduces a compact multimode fiber-based device that simultaneously measures wavelength and polarization with high precision, leveraging mode reshuffling and neural networks for enhanced sensitivity in optical analysis.

Contribution

The work presents a novel MMF-based high-dimensional light analyzer with mode reshuffling and a dedicated neural network, achieving simultaneous high-precision wavelength and SOP measurements.

Findings

Wavelength resolution of 0.045 pm achieved

SOP resolution of 0.0088 demonstrated

Enhanced sensitivity through mode reshuffling and neural network optimization

Abstract

The wavelength and state of polarization (SOP) are fundamental properties of an optical field which are essential for applications in optical communications, imaging and other fields. However, it is challenging for existing spectrometers and polarimeters to measure these parameters simultaneously, resulting in reduced spatial and temporal efficiency. To overcome this limitation, we propose and demonstrate a compact multimode fiber (MMF)-based high-dimensional light analyzer capable of simultaneously performing high-precision measurements of both wavelength and SOP. Core-offset launching is introduced in the MMF to reshuffle the mode coupling. A neural network named WP-Net has been designed dedicated to wavelength and SOP synchronization measurements. Physics-informed loss function based on optical prior knowledge is used to optimize the learning process. These advancements have enhanced the sensitivity, achieving a wavelength resolution of 0.045 pm and an SOP resolution of 0.0088.