The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Optical frequency transfer via a 1840 km fiber link has been investigated. Twenty fiber amplifiers and two fiber Brillouin amplifiers are needed to compensate for 420 dB of loss. Active noise compensation reduces the instability to 2.7 × 10−15 at 1 s with 4 × 10−19 after 100 s and an accuracy of a few parts in 1019.
Distributing a stable, absolute optical reference frequency via fiber network would serve research and development in academia and industry. Lasers stabilized to high-finesse Fabry–Pérot cavities can achieve fractional frequency instabilities of less than 10−15 for periods up to several seconds. Their instabilities increase for longer averaging times due to a variable frequency drift, with a linear...
When comparing independent simultaneous measurements of the same, non-constant frequency, synchronization errors between the frequency counter's gate time intervals lead to an apparent frequency deviation between the measurements. Here we present a technique that allows for a remote measurement of the counters' synchronization offset with sub-microsecond accuracy using a phase-stabilized fiber link.
We describe a system that combines a cavity-stabilized laser, a hydrogen maser and a cesium fountain clock. It provides an optical reference frequency that over the course of half a day drifts with less than 100 µHz/s. Furthermore it allows for a convenient measurement of an absolute frequency in the optical domain.
Optical frequency transfer via a 920 km fiber link has been investigated. Active noise compensation enables the transfer of a stable optical frequency with a stability of 3.8 × 10−14 at 1 s reaching 4 × 10−18 after 104 s and an accuracy of 3.6 × 10−19.
We aim at distributing the most precise frequency references provided by optical clocks, both from specialized labs to end users, and between specialized labs for comparing optical clocks. Transmitting an optical carrier over standard telecom fibre, we have transported frequency information over up to 900 km distance, with fidelity close to theoretical limits and reaching a precision of a few parts...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.