Invention Grant
- Patent Title: Bend insensitivity in single mode optical fibers
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Application No.: US12072869Application Date: 2008-02-28
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Publication No.: US08374472B2Publication Date: 2013-02-12
- Inventor: John Michael Fini , Poul Kristensen
- Applicant: John Michael Fini , Poul Kristensen
- Applicant Address: US GA Norcross
- Assignee: OFS Fitel, LLC
- Current Assignee: OFS Fitel, LLC
- Current Assignee Address: US GA Norcross
- Main IPC: G02B6/36
- IPC: G02B6/36 ; G02B6/02

Abstract:
An optical fiber that is relatively insensitive to bend loss comprises a core region and a cladding region configured to support and guide the propagation of light in a fundamental transverse mode, the cladding region including (i) an outer cladding region having a refractive index less than that of the core region, (ii) an annular cladding pedestal region having a refractive index higher than that of the outer cladding region and comparable to that of the core region, and (iii) an annular cladding inner trench region disposed between the core region and the pedestal region, the inner trench region having a refractive index less than that of the outer cladding region. In one embodiment, the fiber also includes a (iv) an annular cladding outer trench region disposed between the pedestal region and the outer cladding region, the outer trench region having a refractive index less than that of the outer cladding region. In addition, to suppress HOMs the pedestal region is configured to resonantly couple at least one other transverse mode of the core region to at least one transverse mode of the pedestal region. Such fiber is advantageously used as access fiber, but may have other applications, such as sensor fiber.
Public/Granted literature
- US20090060437A1 Bend insensitivity in single mode optical fibers Public/Granted day:2009-03-05
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