Time Transfer Through Optical Fibers (TTTOF): First Results of Calibrated Clock Comparisons

Abstract

We have developed a means for accurate time transfer using optical fibers and aim at the synchronization of clocks located at different places on an institute campus with an overall uncertainty of 100 ps or better. Such an installation shall be used as a part of the infrastructure connecting the ground station setups during forthcoming T2L2 and ACES experiments and the local installations at the PTB time laboratory. Our target transmission length is less than 1 km. To transfer time, a code-domain-multiple-access (CDMA) signal is used for modulation of a laser. Optical signals are exchanged in the two-way mode to cancel long-term fiber length variation. This is similar to the well known two-way satellite time and frequency transfer (TWSTFT) scheme. We discuss procedures for a proper calibration of such time transfer through optical fibers links and show first promising results of an experiment using a test loop on the PTB campus with a length of 2 km.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 2009
Accession Number
ADA517803

Entities

People

  • Andreas Bauch
  • Dirk Piester
  • Michael Rost
  • Miho Fujieda

Tags

Communities of Interest

  • Space

DTIC Thesaurus Topics

  • Accuracy
  • Amplifiers
  • Calibration
  • Carrier Frequencies
  • Clocks
  • Communication Systems
  • Comparators
  • Data Sets
  • Fibers
  • Frequency
  • Ground Stations
  • Materials
  • Measurement
  • Multiple Access
  • Optical Fibers
  • Standards
  • Time Intervals

Fields of Study

  • Physics

Readers

  • Optical Fiber Sensing and Electromagnetic Propagation.
  • Positioning, Navigation, and Timing (PNT) Technology.

Technology Areas

  • Directed Energy
  • Space