We present numerical simulations of the Dual-pulse Phase-sensitive Optical Time-domain Reflectometer which response is affected by the laser optical frequency drift. The phase signals retrieved from ...

CBP is seeking proposals from potential contractors for the FOCI contract to install and test fiber optic cables along the ...

High time-resolution monitoring of nitrogen dioxide (NO 2) is of great importance for studying the formation mechanism of aerosols and improving air quality. Based on the Griess–Saltzman (GS) reaction ...

Laser light with an ultrastable frequency in the ytterbium ion optical clock at NPL. Credit: Andrew Brookes By comparing optical clocks in six different countries, researchers have taken a major step ...

A micro-displacement sensing head based on two aligned cleaved fibers inserted into an optical fiber ring and interrogated by an optical time-domain reflectometry is presented. The sensor ...

In the past decade, the emergence of ultrathin 2D films consisting of only a few atomic layers deposited on various substrates sparked new ideas and research. This Perspective provides a nonexhaustive ...

Optical clocks are now about 100 times more accurate than the best cesium clocks and can measure time so accurately that they would lose or gain less than one second over billions of years.