STABILIZED FIBER OPTIC FREQUENCY DISTRIBUTION SYSTEM

Lori E. Primas, George F. Lutes, Richard L. Sydnor

Abstract:	A technique for stabilizing reference frequencies transmitted over fiber optic cable in a frequency distribution system is discussed. The distribution system utilizes fiber optic cable as the transmission medium to distribute precise reference signals from a frequency standard to remote users. The stability goal of the distribution system is to transmits 100 MHz signal over a 22 km fiber optic cable and maintain a stability of i part in 101" for 1000 seconds averaging times. Active stabilization of the link is required to reduce phase variations produced by environmental effects, and is achieved by transmitting the reference signal from the frequency standard to the remote unit and then reflecting back to the reference unit over the same optical fiber. By comparing the phase of the transmitted and reflected signals at the reference unit, phase variations on the remote signal can be measured. An error voltage derived from the phase difference between the two signals is used to add correction phase. An improved version of a previous electronic stabilizer has been built and results of its performance are reported.
Published in:	Proceedings of the 20th Annual Precise Time and Time Interval Systems and Applications Meeting November 29 - 1, 1988 Sheraton Premiere Hotel Vienna, Virginia
Pages:	23 - 34
Cite this article:	Primas, Lori E., Lutes, George F., Sydnor, Richard L., "STABILIZED FIBER OPTIC FREQUENCY DISTRIBUTION SYSTEM," Proceedings of the 20th Annual Precise Time and Time Interval Systems and Applications Meeting, Vienna, Virginia, November 1988, pp. 23-34.
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