Abstract
In NASA’s Deep Space Network (DSN), the phase stability of the clock synchronization link interconnecting various antenna sites ultimately determines the system’s tracking accuracy. Use of a multimode optical fiber to improve the stability of this loop was shown previously to be comparable with the best coaxial cables.1 Other studies have shown that the phase temperature coefficient (TC) of bare optical fibers is largely dominated by core refractive- index changes resulting from electron polarizability shifts2 and cladding-induced stress-optic effects.3,4 Ruggedized cabled fibers can exacerbate the latter effect, but oddly these have remained largely unexplored.5 In this paper, the phase TC of two ruggedized optical-fiber cable structures is studied: one single-mode fiber housed in a loose-tube cable and a multimode fiber housed In a solid cable.
© 1984 Optical Society of America
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