The Rubin Observatory in Chile has begun a 10-year sky survey, using the world’s largest digital camera to find asteroids, ...

Abstract: Long-distance distributed fiber-optic sensing based on optical pulse coding is widely applied in structural health monitoring and geological disaster early warning. However, erbium-doped ...

An Osaka Metropolitan University-led research team investigated the decay time of coherent longitudinal optical (LO) phonons both in a GaAs 1−x N x epilayer and in a GaAs single crystal, to clarify ...

Optical lattice clocks are emerging timekeeping devices based on tens of thousands of ultracold atoms trapped in an optical lattice (i.e., a grid of laser light). By oscillating between two distinct ...

As fibre optic networks grow in both size and complexity, so does the need to monitor their performance in real time. The Optical Time Domain Reflectometer (OTDR) is a familiar instrument used by ...

Abstract: A novel Brillouin optical time-domain reflectometer using an adaptive frequency analysis (AFA) algorithm enhances spatial resolution by 2.5 times at 10 MHz frequency resolution compared to ...

A time domain reflectometer (TDR) measures reflections along a cable. It is similar in principle to radar. To measure those reflections, the TDR transmits an incident signal into the cable and watches ...

In a new study, researchers carried out the most extensive coordinated comparison of optical clocks to date by operating clocks and the links connecting them simultaneously across six countries.

In this look at transmission line theory, we will assume an RG-58 type of coaxial cable which has a characteristic impedance of 50 Ω. Where we let C stand for the capacitance per unit length, 30 pF ...

The AQ7290 is equipped with new functions that improve operability and workability. Six standard and high-performance models are available in the AQ7290 series, offering a selection of two or three ...