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ime and Frequency Signal Transmission Over Single Optical Fiber

A. S. Karpichev, P. V. Zinovev, A. V. Vytnov

Transactions of IAA RAS, issue 60, 39–43 (2022)

Keywords: signal transmission over optical fiber, frequency transfer, time transfer, remote devices synchronization

Abstract

In recent years, fiber-optic transmission lines have taken an increasingly strong position in the transmission of both digital and analog signals for various purposes. In observatories of Quasar VLBI Network optical fibers are used for transmission of time and frequency signals from hydrogen masers to remote devices. Time and frequency signals use independent optical transmission lines. Merging time and frequency signals in single optical fiber allows to raise accuracy of line calibration. The paper shows experimental results of such communication method that requires a single optical fiber to transmit both time and frequency signals. Combining optical signals is achieved by using telecommunication CWDM-multiplexer, widely used in telecommunication equipment. Cable delay change in time and frequency stability (Allan variance) was measured within a 24-hour experiment. Cable delay was measured with a help of time interval counter. Allan variance was measured with the help of frequency comparator. The result reveals that combined time and frequency signals can be transmitted over a single optical fiber. Such transmission method can be used in modern VLBI radio telescopes. This makes it possible to measure the propagation delay of signals in the transmission line in real time with accuracy better than 100 ps.

Citation

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A. S. Karpichev, P. V. Zinovev, A. V. Vytnov. ime and Frequency Signal Transmission Over Single Optical Fiber // Transactions of IAA RAS. — 2022. — Issue 60. — P. 39–43.

@article{karpichev2022,
  abstract = {In recent years, fiber-optic transmission lines have taken an increasingly strong position in the transmission of both digital and analog signals for various purposes. In observatories of Quasar VLBI Network optical fibers are used for transmission of time and frequency signals from hydrogen masers to remote devices. Time and frequency signals use independent optical transmission lines. Merging time and frequency signals in single optical fiber allows to raise accuracy of line calibration.
The paper shows experimental results of such communication method that requires a single optical fiber to transmit both time and frequency signals. Combining optical signals is achieved by using telecommunication CWDM-multiplexer, widely used in telecommunication equipment. Cable delay change in time and frequency stability (Allan variance) was measured within a 24-hour experiment. Cable delay was measured with a help of time interval counter. Allan variance was measured with the help of frequency comparator.
The result reveals that combined time and frequency signals can be transmitted over a single optical fiber. Such transmission method can be used in modern VLBI radio telescopes. This makes it possible to measure the propagation delay of signals in the transmission line in real time with accuracy better than 100 ps.},
  author = {A.~S. Karpichev and P.~V. Zinovev and A.~V. Vytnov},
  doi = {10.32876/ApplAstron.60.39-43},
  issue = {60},
  journal = {Transactions of IAA RAS},
  keyword = {signal transmission over optical fiber, frequency transfer, time transfer, remote devices synchronization},
  pages = {39--43},
  title = {ime and Frequency Signal Transmission Over Single Optical Fiber},
  url = {http://iaaras.ru/en/library/paper/2118/},
  year = {2022}
}

TY  - JOUR
TI  - ime and Frequency Signal Transmission Over Single Optical Fiber
AU  - Karpichev, A. S.
AU  - Zinovev, P. V.
AU  - Vytnov, A. V.
PY  - 2022
T2  - Transactions of IAA RAS
IS  - 60
SP  - 39
AB  - In recent years, fiber-optic transmission lines have taken an
increasingly strong position in the transmission of both digital and
analog signals for various purposes. In observatories of Quasar VLBI
Network optical fibers are used for transmission of time and
frequency signals from hydrogen masers to remote devices. Time and
frequency signals use independent optical transmission lines. Merging
time and frequency signals in single optical fiber allows to raise
accuracy of line calibration.  The paper shows experimental results
of such communication method that requires a single optical fiber to
transmit both time and frequency signals. Combining optical signals
is achieved by using telecommunication CWDM-multiplexer, widely used
in telecommunication equipment. Cable delay change in time and
frequency stability (Allan variance) was measured within a 24-hour
experiment. Cable delay was measured with a help of time interval
counter. Allan variance was measured with the help of frequency
comparator.  The result reveals that combined time and frequency
signals can be transmitted over a single optical fiber. Such
transmission method can be used in modern VLBI radio telescopes. This
makes it possible to measure the propagation delay of signals in the
transmission line in real time with accuracy better than 100 ps.
DO  - 10.32876/ApplAstron.60.39-43
UR  - http://iaaras.ru/en/library/paper/2118/
ER  -