WO2007019158A2 - Composants de fibres optiques passifs resistants a l'intrusion - Google Patents

Composants de fibres optiques passifs resistants a l'intrusion Download PDF

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Publication number
WO2007019158A2
WO2007019158A2 PCT/US2006/030038 US2006030038W WO2007019158A2 WO 2007019158 A2 WO2007019158 A2 WO 2007019158A2 US 2006030038 W US2006030038 W US 2006030038W WO 2007019158 A2 WO2007019158 A2 WO 2007019158A2
Authority
WO
WIPO (PCT)
Prior art keywords
layer
fiber
fibers
splice
covering
Prior art date
Application number
PCT/US2006/030038
Other languages
English (en)
Other versions
WO2007019158A3 (fr
Inventor
Cary R. Murphy
Mark H. Bridges
David E. Vokey
Original Assignee
Network Integrity Systems, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Network Integrity Systems, Inc. filed Critical Network Integrity Systems, Inc.
Publication of WO2007019158A2 publication Critical patent/WO2007019158A2/fr
Publication of WO2007019158A3 publication Critical patent/WO2007019158A3/fr

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/255—Splicing of light guides, e.g. by fusion or bonding
    • G02B6/2558—Reinforcement of splice joint
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4439—Auxiliary devices
    • G02B6/444—Systems or boxes with surplus lengths
    • G02B6/4453—Cassettes

Definitions

  • the present invention relates to passive fiber optic components for a fiber optic network that are modified to add security and intrusion resistance.
  • IDSs Intrusion Detection Systems
  • an optical fiber network comprising: at least two optical fibers arranged for transmission of light signals along the fibers containing data; at least one passive optical component in the network connected to at least one of the fibers; and a covering layer of an opaque material over the passive optical component arranged to contain and/or absorb stray emissions from the light signals in order to inhibit eaves-dropping attempts.
  • the layer of an opaque material encloses the passive optical component.
  • a layer of the opaque material at least partly covering the fiber adjacent its connection with the passive optical component.
  • the layer is formed at least partly by a foil which is opaque to light.
  • the layer contains pigment which is opaque to light.
  • the layer is bonded to an exterior surface of the passive component.
  • the layer forms a separate covering which is closed around the passive component.
  • the passive component comprises a splice tray and wherein the layer is provided by a separate covering which encompasses the splice tray.
  • the separate covering is a flexible bag.
  • the splice tray includes a lid which can be attached to the tray both of which are formed from the layer of an opaque material.
  • the covering is sealed with a tamper-evident device that can actively or passively alarm upon an attempt at breaching the opaque covering.
  • the passive component comprises a splice between two butting ends of the fibers and wherein the layer is provided by a sleeve which surrounds the splice and adjacent portions of the fibers.
  • the passive component comprises a fiber connector connected to one end of a fiber and wherein the layer is provided by a sleeve which surrounds the connector and an adjacent portion of the fiber.
  • a splice tray for mounting in an optical fiber network for connecting at least two optical fibers arranged for transmission of light signals along the fibers containing data, the splice tray including a layer of an opaque material arranged to contain and/or absorb stray emissions from the light signals in order to inhibit eaves- dropping attempts.
  • a splice connector for mounting in an optical fiber network for connecting at least two optical fibers arranged for transmission of light signals along the fibers containing data, the splice connector including a covering sleeve of an opaque material arranged to contain and/or absorb stray emissions from the light signals in order to inhibit eaves-dropping attempts.
  • a fiber connector for mounting in an optical fiber network for connecting an optical fiber to a component arranged for transmission of light signals along the fiber containing data, the fiber connector including a covering sleeve of an opaque material arranged to contain and/or absorb stray emissions from the light signals in order to inhibit eaves-dropping attempts.
  • an encasement sleeve for protecting or enabling a slice or connection of fibers including but not limited to fusion splices and couplers, comprised of a sleeve of an opaque material arranged to contain and/or absorb stray emissions from the light signals in order to inhibit eaves-dropping attempts.
  • Figure 1 is a schematic side elevational view of an encasement sleeve of a fiber optic network according to the present invention.
  • Figure 2 is a cross-sectional view of the encasement sleeve of Figure 1.
  • Figure 3 is a cross-sectional view of a modified version of the splice connector of Figure 1.
  • Figure 4 is a schematic side elevational view of a portion of a fiber of a fiber optic network according to the present invention.
  • Figure 5 is an isometric view of a typical fiber optic splice tray of a fiber optic network according to the present invention.
  • Figure 6 is an isometric view of a typical fiber optic splice tray of a fiber optic network according to the present invention including a separate covering layer of a flexible material.
  • Figure 7 is side elevational view of a fiber connector of a fiber optic network according to the present invention.
  • Figure 8 shows a cross-sectional view of the fiber connector of Figure 7.
  • FIG 9 shows, a typical fiber optic network of the type with which
  • Figure 9 shows a typical network installation and areas of vulnerability including connector 9 connecting fiber to equipment, fusion splice 10 splicing the connector to bare fiber 11 which continues into and is looped within splice tray 12. Exiting fiber is connected at 13, and that connector is fusion spliced 14 to fiber network.
  • the network can of course include components as well known to one skilled in the art but as shown there are a number of passive components in the network.
  • the couplers are used in a monitoring system schematically indicated at 20 for monitoring the fibers for intrusion events as described in prior US applications by the present inventors for "AN INTRUSION DETECTION SYSTEM FOR USE ON MULTI-MODE OPTICAL FIBER USING AN OFFSET LAUNCH AND TAP COUPLER", as set out in United States application filed May 26, 2005, Serial No: 11/137,777 and "AN INTRUSION DETECTION SYSTEM FOR USE ON SINGLE MODE OPTICAL FIBER USING A POLARIMETER", as set out in United States application filed June 15, 2005, Serial No: 11/152,681 the disclosures of which are incorporated herein by reference, as well as couplers used for network distribution and monitoring.
  • Figure 2 illustrates the splice connector 15 which includes an opaque sleeve such as those commonly used for protecting a splice.
  • the sleeve contains an opaque barrier that inhibits the emission of light.
  • the opaque barrier comprises a layer of a foil, a coating of a metal alloy and/or a pigment contained in the material of the layer where the pigment is provided in sufficient quantity to prevent penetration of light to a measurable standard.
  • two fibers are joined by a fusion splice 22, they are typically encapsulated in a device that hermetically seals and protects the exposed bare fiber, as well as adding an optional strengthening member possibly in the form of a metal rod to protect this sensitive section from breakage.
  • a device that hermetically seals and protects the exposed bare fiber, as well as adding an optional strengthening member possibly in the form of a metal rod to protect this sensitive section from breakage.
  • There are several mechanisms for leakage associated with such a device including mechanical stress caused by the shrinkage of the protective jacket, micro- bending and macro-bending from the protective jacket, and scattering from the point of connection of the two fibers. This causes light, in which transmitted intelligence is present, to leak out from around the physical package; and it is not uncommon for a loss of 0.1dB to be introduced here.
  • the opaque sleeve 21 surrounds the splice 22, the strengthening member and the adjacent portions of the two fibers 10 and 11.
  • Figure 3 illustrates an opaque sleeve 24 similar to that of Figure 1 above.
  • the sleeve contains both an opaque barrier 25 which inhibits the emission of light, as well as an internal absorptive coating 26
  • Such coatings are well known, as for example shown in US Patents 5,892,476 and 7,074,351
  • Figure 4 shows a fiber 10 coated with an opaque barrier. This includes, but is not limited to a coating 28 applied directly to the fiber, a sleeve 27 surrounding the fiber, or furcation tubing.
  • the sleeve 27 surrounds the end of the fiber and contains a material so that it is opaque to the light emitted. While the sleeve may be applied at a splice, it is also contemplated herein that the sleeve be applied to a single fiber at a location other than a splice.
  • the single optical fiber includes a covering sleeve, material, or deposition comprised of opaque material that contains and/or absorbs stray emissions from the light therein.
  • Figure 5 shows a typical fiber optic splice tray 16 covered with an opaque and/or absorptive shield 30.
  • bare optical fibers are routinely wound to a radius sufficient to allow so- called macro-bend loss. This emission of the escaping light and evanescent wave contains the information transmitted in the fiber, and could be picked up by sensitive electronics.
  • a flexible cover separate from the tray is applied in the form of a shield or bag 30 that encompasses the splice tray and optionally could be sealed with an opaque adhesive.
  • this could be sealed with a tamper-evident device 31 that can actively or passively alarm upon an attempt at breaching the opaque cover.
  • Figure 6 shows a typical fiber optic splice tray 32 with an opaque and/or absorptive cover 33.
  • the cover and tray are manufactured from an opaque absorptive material or coated with same as described above.
  • this could be sealed with a tamper-evident device that can actively or passively alarm upon an attempt at breaching the opaque cover.
  • Figures 7 and 8 show a typical fiber connector 9 with an opaque and/or absorptive jacket 35 for inhibiting leakage of cladding modes and other connector related loss mechanisms.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Coupling Of Light Guides (AREA)

Abstract

Un réseau de fibres optiques selon l'invention présente au moins deux fibres optiques conçues pour la transmission de signaux lumineux le long des fibres contenant des données ainsi qu'une série de composants optiques passifs dans le réseau connectés à au moins une des fibres, tel qu'un connecteur de fibres optiques pour la connexion à une borne et des connecteurs d'épissure qui sont recouverts par une couche de revêtement constituée d'un matériau opaque sur le composant optique passif conçue pour contenir et/ou absorber des émissions parasites des signaux lumineux de manière à empêcher les tentatives d'écoute clandestine. Des plateaux d'épissure peuvent être constitués de matériau opaque ou peuvent être enfermés par un revêtement séparé formé à partir d'un matériau opaque.
PCT/US2006/030038 2005-08-03 2006-08-02 Composants de fibres optiques passifs resistants a l'intrusion WO2007019158A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US70492205P 2005-08-03 2005-08-03
US60/704,922 2005-08-03

Publications (2)

Publication Number Publication Date
WO2007019158A2 true WO2007019158A2 (fr) 2007-02-15
WO2007019158A3 WO2007019158A3 (fr) 2007-04-12

Family

ID=37727865

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2006/030038 WO2007019158A2 (fr) 2005-08-03 2006-08-02 Composants de fibres optiques passifs resistants a l'intrusion

Country Status (1)

Country Link
WO (1) WO2007019158A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009015875A3 (fr) * 2007-07-30 2009-04-02 Ewe Netz Gmbh Manchon pour câbles à fibres optiques
EP2607938A1 (fr) * 2011-12-21 2013-06-26 Draka Comteq B.V. Procédé et système pour installer une partie d'un réseau de communication, ainsi qu'un réseau de communication

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4148553A (en) * 1976-11-22 1979-04-10 International Telephone & Telegraph Corp. Multifiber cable splicer
US4733933A (en) * 1984-01-20 1988-03-29 Hughes Aircraft Company Fiber optic structure and method of making
US5656996A (en) * 1996-03-13 1997-08-12 Global Associates, Ltd. Electronic security bonding device
US6282353B1 (en) * 1999-10-29 2001-08-28 Amherst Holding Co. Fiber splice protection sleeve

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4148553A (en) * 1976-11-22 1979-04-10 International Telephone & Telegraph Corp. Multifiber cable splicer
US4733933A (en) * 1984-01-20 1988-03-29 Hughes Aircraft Company Fiber optic structure and method of making
US5656996A (en) * 1996-03-13 1997-08-12 Global Associates, Ltd. Electronic security bonding device
US6282353B1 (en) * 1999-10-29 2001-08-28 Amherst Holding Co. Fiber splice protection sleeve

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009015875A3 (fr) * 2007-07-30 2009-04-02 Ewe Netz Gmbh Manchon pour câbles à fibres optiques
EP2607938A1 (fr) * 2011-12-21 2013-06-26 Draka Comteq B.V. Procédé et système pour installer une partie d'un réseau de communication, ainsi qu'un réseau de communication

Also Published As

Publication number Publication date
WO2007019158A3 (fr) 2007-04-12

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