# Multimode fiber based single-shot full-field measurement of optical pulses

## TL;DR

This paper introduces a novel single-shot method using multimode fibers to measure optical pulses in full-field, capturing both amplitude and phase in spectral and temporal domains with high sensitivity.

## Contribution

It presents a new technique leveraging multimode fiber speckle patterns for comprehensive, real-time optical pulse characterization in a simple and sensitive manner.

## Key findings

- Successfully retrieves amplitude and phase of optical signals
- Operates in spectral and temporal domains
- Demonstrates high sensitivity and versatility

## Abstract

Multimode fibers are widely explored for optical communication, imaging and sensing applications. The interference of fiber guided modes generates a speckle pattern, which has been used for high-precision spectroscopy, temperature, and strain sensing. Here we demonstrate a single-shot full-field temporal measurement technique based on a multimode fiber. The complex spatiotemporal speckle field is created by a reference pulse propagating through the fiber, and it interferes with a signal pulse. From the time-integrated interference pattern, both the amplitude and the phase of the signal are retrieved in spectral and temporal domains. The simplicity and high sensitivity of our scheme illustrate the potential of multimode fibers as versatile and multi-functional sensors.