Amplified Dispersive Fourier-Transform Imaging for Ultrafast Displacement Sensing and Barcode Reading

TL;DR

This paper introduces a novel ultrafast barcode reader and displacement sensor using internally-amplified dispersive Fourier transformation, achieving record speeds of 25 MHz for real-time optical measurements.

Contribution

It presents a new technique that amplifies and maps spectrally encoded information into time domain, enabling ultrafast sensing and barcode reading at unprecedented speeds.

Findings

Achieved 25 MHz acquisition speed, four orders faster than previous methods.

Demonstrated real-time displacement sensing and barcode reading capabilities.

Simplified optical system using dispersive fiber and single photodetector.

Abstract

Dispersive Fourier transformation is a powerful technique in which the spectrum of an optical pulse is mapped into a time-domain waveform using chromatic dispersion. It replaces a diffraction grating and detector array with a dispersive fiber and single photodetector. This simplifies the system and, more importantly, enables fast real-time measurements. Here we describe a novel ultrafast barcode reader and displacement sensor that employs internally-amplified dispersive Fourier transformation. This technique amplifies and simultaneously maps the spectrally encoded barcode into a temporal waveform. It achieves a record acquisition speed of 25 MHz -- four orders of magnitude faster than the current state-of-the-art.