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AN OPTICAL-FIBER NETWORK FOR FREQUENCY COMPARISONS ESTABLISHED IN BOULDER.

In a joint program with the city of Boulder, the Department of Commerce, the University of Colorado (UC), and the National Center for Atmospheric Research, an optical-fiber network--BRAN (Boulder Research and Administrative Network)--has been installed connecting various organizations dispersed throughout the city. A number of network fibers have been assigned to NIST; including a dark pair (no included optoelectronic interfaces) of fibers. These fibers connect optical systems at NIST to systems at JILA on the UC campus. The distance along the fiber between these two sites is approximately 3.5 km. Exceptional microwave and optical frequency standards are located in these two locations, which provide the opportunity to study the performance of this direct fiber connection.

In preliminary experiments, NIST and JILA have demonstrated high short-term-stability transfer of frequency across the network. They first modulated the output of a 1.3 [micro]m laser at 2.3 GHz using a source locked to a hydrogen maser in the NIST time scale. This was transferred to the university over BRAN and then back to the division. The uncompensated diurnal variations of the time delay between the two sites were about 140 ps, and can be controlled well below this level.
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Publication:Journal of Research of the National Institute of Standards and Technology
Geographic Code:1USA
Date:Mar 1, 2001
Words:200
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