Sound creates light: German researchers transfer ultra-stable frequency across a 480-km-long optical fiber link

German researchers at the Physikalisch-Technische Bundesanstalt have found an elegant solution to transmit an optical frequency with extreme precision: they employ fiber Brillouin amplification. The new method simplifies the comparison of newly developed optical clocks and it is likely to have applications in other areas where precise synchronization is needed, for example in radio astronomy. Experts in geodesy have already approached the PTB researchers with suggestions for joint projects.

Read the whole article on Physorg

More from Physorg