Large scale infrastructure for precise time and frequency bidirectional transmission

Josef Vojtech; Ondrej Havlis; Martin Slapak; Vladimir Smotlacha; Tomas Horvath; Lada Altmannova; Radek Velc; Jan Kundrat; Rudolf Vohnout; Sarbojeet Bhowmick; Michal Hazlinsky; Martin Cizek; Jan Hrabina; Lenka Pravdova; Ondrej Cip; Jaroslav Roztocil

doi:10.1117/12.2592328

1 August 2021 Large scale infrastructure for precise time and frequency bidirectional transmission

Josef Vojtech, Ondrej Havlis, Martin Slapak, Vladimir Smotlacha, Tomas Horvath, Lada Altmannova, Radek Velc, Jan Kundrat, Rudolf Vohnout, Sarbojeet Bhowmick, Michal Hazlinsky, Martin Cizek, Jan Hrabina, Lenka Pravdova, Ondrej Cip, Jaroslav Roztocil

Author Affiliations +

Proceedings Volume 11830, Infrared Remote Sensing and Instrumentation XXIX; 1183002 (2021) https://doi.org/10.1117/12.2592328
Event: SPIE Optical Engineering + Applications, 2021, San Diego, California, United States

Abstract

Precise time and ultra-stable optical frequency transfers over fiber networks are deployed relatively often these days. When size of such infrastructure for precise time and frequency bidirectional transmission is becoming significant, aspects associated with infrastructure operational cost and time needed for deployment of time and frequency transmission must be considered. First can be decreased via fiber sharing with telecommunication traffic, however spectral allocation must be considered carefully to avoid mutual disturbance of time and frequency transmission versus data and allow future accommodation of growing demands. In text, we show and discuss alternative spectral bands to be used for time and frequency transmission. Time to deployment can be quite excessive especially when transmission must be established via multiple networks or network domains, also there is a chance of blocking. In case of precise time and optical radio frequency transmission it is possible to use conversion from optical to electrical and back to optical domain with wavelength change. This possibility removes danger of blocking and improves time to deployment for such services. We also address possibility to change wavelength or just extend reach by using simple re-amplify and reshape approach.

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Josef Vojtech, Ondrej Havlis, Martin Slapak, Vladimir Smotlacha, Tomas Horvath, Lada Altmannova, Radek Velc, Jan Kundrat, Rudolf Vohnout, Sarbojeet Bhowmick, Michal Hazlinsky, Martin Cizek, Jan Hrabina, Lenka Pravdova, Ondrej Cip, and Jaroslav Roztocil "Large scale infrastructure for precise time and frequency bidirectional transmission", Proc. SPIE 11830, Infrared Remote Sensing and Instrumentation XXIX, 1183002 (1 August 2021); https://doi.org/10.1117/12.2592328

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