Two-Way Time Transfer Through 2.4 GBit/s Optical SDH System

Abstract

An experiment to transfer time and frequency over 2.488 Gbits SDH (Synchronous Digital Hierarchy) systems using 175-km commercial optical fibers has been set up by CRL and NTT. We confirm that the frequency stability of the time comparison data is 10(12)/square root of tau at averaging times above 10 s. This equals that of the Cs frequency standard (H5071A) used in this experiment. The time comparison resolution is of the order of 10(-11) s (square root of time variance). The long-term stability of this system is expected to be better than 1 ns. The time comparison results of this experiment agree well the GPS common-view results.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1997
Accession Number
ADA514699

Entities

People

  • Atsushi Imaoka
  • Kuniyasu Imamura
  • Masami Kihara
  • Michito Imae

Organizations

  • NTT, Inc.

Tags

Communities of Interest

  • Space

DTIC Thesaurus Topics

  • Atomic Beam Masers
  • Cables
  • Communication Systems
  • Data Processing
  • Data Transmission
  • Electronic Mail
  • Fiber-Optic Cables
  • Fibers
  • Frequency
  • Frequency Standards
  • Information Operations
  • Measurement
  • Numbers
  • Optical Fibers
  • Square Roots
  • Standards
  • Time Intervals

Readers

  • Graph Algorithms and Convex Optimization.
  • Positioning, Navigation, and Timing (PNT) Technology.
  • Radio communications and signal processing.

Technology Areas

  • Space