Related Experiment Video
Updated: Mar 17, 2026

Implementation of a Reference Interferometer for Nanodetection
Published on: April 26, 2014
Multipoint sensing with a low-coherence source using single-arm frequency-shifted interferometry
Abstract:
We demonstrate that multiple-site sensing along an optical fiber can be done with incoherent continuous-wave light. Using a broadband low-coherence noise source, a slow detector, and an optical modulator, we construct a single-arm frequency-shifted interferometer (SA-FSI) capable of simultaneously sensing multiple weak-reflection sites distributed either in parallel or in series along fiber links. By scanning the driving frequency of an electro-optic amplitude modulator in the range of 2.7-3.2 GHz at steps of 41.7 KHz, we demonstrate a spatial resolution of 0.3 m and a measurement range of over 1 km.
Related Concept Videos
Phase Contrast and Differential Interference Contrast Microscopy
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations
Infrared (IR) Spectroscopy: Overview
Different compounds display unique properties due to their...

