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Title: Concentric core optical fiber with multiple-mode signal transmission

A concentric core optical fiber provides for the simultaneous but independent transmission of signals over a single optical fiber. The concentric optical fiber is constructed of a single-mode or multimode inner optical fiber defined by a core and a cladding of a lower index of refraction than the core and an outer optical fiber defined by additional cladding concentrically disposed around the cladding and of an index of refraction lower than the first mentioned cladding whereby the latter functions as the core of the outer optical fiber. By employing such an optical fiber construction with a single-mode inner core or optical fiber, highly sensitive interferometric and stable less sensitive amplitude based sensors can be placed along the same length of a concentric core optical fiber. Also, by employing the concentric core optical fiber secure telecommunications can be achieved via the inner optical fiber since an intrusion of the concentric optical fiber will first cause a variation in the light being transmitted through the outer optical fiber and this variation of light being used to trigger a suitable alarm indicative of the intrusion.
Inventors:
 [1]
  1. (Lenoir City, TN)
Issue Date:
OSTI Identifier:
870945
Assignee:
Martin Marietta Energy Systems, Inc. (Oak Ridge, TN) ORNL
Patent Number(s):
US 5627934
Contract Number:
AC05-84OR21400
Research Org:
LOCKHEED MARTIN ENRGY SYST INC
Country of Publication:
United States
Language:
English
Subject:
concentric; core; optical; fiber; multiple-mode; signal; transmission; provides; simultaneous; independent; signals; single; constructed; single-mode; multimode; inner; defined; cladding; index; refraction; outer; additional; concentrically; disposed; mentioned; whereby; latter; functions; employing; construction; highly; sensitive; interferometric; stable; amplitude; based; sensors; placed; length; secure; telecommunications; achieved; via; intrusion; variation; light; transmitted; trigger; suitable; alarm; indicative; signal transmission; inner core; optical fiber; concentrically disposed; single optical; core optical; concentric core; single optic; /385/

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