Simultaneous transfer of optical frequency and time over 306 km long-haul optical fibre link

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081731%3A_____%2F16%3A00468524" target="_blank" >RIV/68081731:_____/16:00468524 - isvavai.cz</a>

Result on the web

<a href="http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=2595358" target="_blank" >http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=2595358</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1117/12.2264514" target="_blank" >10.1117/12.2264514</a>

Result language

angličtina

Original language name

Simultaneous transfer of optical frequency and time over 306 km long-haul optical fibre link

Original language description

Optical fibre links for distributing optical frequencies and time stamps were researched and experimentally tested in the past fifteen years. They have been used mainly for stability comparison of experimental optical clocks. But recent development puts demands on a technology transfer from laboratory experiments to the real industry. The remote calibration of interrogators of Fibre Bragg Grating strain sensory networks is one of important examples. The first step of the adoption the time and frequency broadcasting should be the drop-out free long-term operation of this technology between research laboratories connected via long-haul fibre links. We present a 306 km long-haul optical fibre link between the cities of Prague and Brno in the Czech Republic where a coherent transfer of stable optical frequency and a stable time signal has been firstly demonstrated. The link between ISI CAS Brno and CESNET Prague uses an internet communication fibre where a window of 1540-1546 nm is dedicated for the coherent transfer and 1PPS signal. The link is equipped with 6 bidirectional EDFA amplifiers. The optical frequency standard based on the highly-coherent laser Koheras Adjustik working at 1540.5 nm and stabilized with a saturation absorption spectroscopy technique was used for the coherent wave transfer. The suppression of the Doppler shift induced by the optical fibre was based on an accoustooptical modulator with a servo-loop including a fast PID controller processing the beat-note frequency given by mixing of the Adjustik laser (Brno) and the reflected frequency of this laser from the far end of 306 km long-haul fibre link (Prague). We verified the Doppler shift suppression for the coherent wave with a measuring method analysing the transport delay of the 1PPS signal.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

10306 - Optics (including laser optics and quantum optics)

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2016

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

20th Slovak-Czech-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics (Proceedings of SPIE 10142)

ISBN

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ISSN

0277-786X

e-ISSN

—

Number of pages

6

Pages from-to

1-6

Publisher name

SPIE

Place of publication

Bellingham

Event location

Jasná

Event date

Sep 5, 2016

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

000393152700021