Dispersion in optical fibers and timing for particle identification

TL;DR

This paper investigates the time dispersion characteristics of mono-mode and multi-mode optical fibers at 532 nm to improve laser calibration systems for particle identification in high-energy physics experiments.

Contribution

It provides a detailed measurement of dispersion properties of optical fibers used in particle detector calibration, highlighting fibers with less than 4 ps/m dispersion for optimal timing accuracy.

Findings

Dispersion less than 4 ps/m achieved with 10 μm core fibers

Mono-mode fibers exhibit favorable dispersion properties

Multi-mode fibers also analyzed for calibration applications

Abstract

In the framework of the TOF Wall laser calibration system of the HARP experiment, a study of time dispersion properties of mono-mode and multi-mode optical fibers in the green band (532 nm) has been carried out. Dispersion less than 4 ps/m has been obtained with $\approx$10 $\mu$m core diameter fibers.