GB2169098A - Optical cables - Google Patents

Optical cables Download PDF

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Publication number
GB2169098A
GB2169098A GB08530480A GB8530480A GB2169098A GB 2169098 A GB2169098 A GB 2169098A GB 08530480 A GB08530480 A GB 08530480A GB 8530480 A GB8530480 A GB 8530480A GB 2169098 A GB2169098 A GB 2169098A
Authority
GB
United Kingdom
Prior art keywords
optical cable
sheath
cable according
optical
strength member
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
GB08530480A
Other versions
GB2169098B (en
GB8530480D0 (en
Inventor
Alan James Peacock
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telephone Cables Ltd
Original Assignee
Telephone Cables Ltd
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 Telephone Cables Ltd filed Critical Telephone Cables Ltd
Publication of GB8530480D0 publication Critical patent/GB8530480D0/en
Publication of GB2169098A publication Critical patent/GB2169098A/en
Application granted granted Critical
Publication of GB2169098B publication Critical patent/GB2169098B/en
Expired legal-status Critical Current

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
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4401—Optical cables
    • G02B6/4429—Means specially adapted for strengthening or protecting the cables
    • G02B6/4434—Central member to take up tensile loads
    • 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
    • G02B6/4401—Optical cables
    • G02B6/4407—Optical cables with internal fluted support member
    • 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
    • G02B6/4401—Optical cables
    • G02B6/441—Optical cables built up from sub-bundles
    • G02B6/4413—Helical structure

Description

GB2169098A 1
SPECIFICATION
Optical cables This invention relates to optical cables of the type having at least one optical unit wound helically around a central strength member and surrounded by an outer protective sheath, the or each said optical unit comprising one or 10 more optical fibres loosely enclosed within a tube. Such cables will be referred to hereinafter as being "of the type specified".
Cables of the type specified are particularly suited for installation in gas pressurised sys- 15 tems. However in such systems the distance between repeaters is such that a low pneumatic resistance is essential. It is thus an object of the present invention to provide additional space within the cable for gas flow along the 20 length of the cable, over and above that provided by the interstices between the stranded optical units.
Accordingly, the invention provides an optical cable of the type specified wherein the 25 central strength member is coated with a plastic sheath having longitudinal grooves in its surface which provided paths for the passage of gas.
The longitudinal grooves may extend parallel 30 to the cable axis, or may follow a helical or undulating path along the sheath, and it will be understood that grooves of these different forms are included within the term "longitudi nal grooves".
35 Preferably, the plastic sheath is extruded around the central strength member. The cable may also include at least one electrical conductor also wound helically around the coated central strength member. The cable 40 may include a plurality of optical units and 105 electrical conductors in terwound with one another. These conductors may be plastic in sulated copper conductors which may be singles or formed into pairs or quads.
45 Further sheaths may be provided around the 110 outer protective sheath.
One embodiment of an optical cable accord ing to the invention will now be more fully described by way of example with reference 50 to the drawing.
The optical cable comprises a plurality of optical fibres 1 loosely enclosed within plastic tube 2 to form optical units. In this embodiment three fibres 1 are shown within each 55 such tube 2 of which nine are shown.
The tubes 2 are helically wound around a central strength member 3 which has been coated with a plastics extrudate 4 having longitudinal grooves 5 running along its length.
60 These grooves 5 allow more gas to flow along the cable than can flow along the interstices between the tubes 2.
The tubes 2 stranded around the central strength member member 3 are finally en- 65 closed within at least one protective sheath 6.
Although only one such sheath is shown, several sheaths having different properties may of course be utilised, as desired.
One or more of the optical units may be 70 replaced by electric conductors which may be in the form of insulated copper conductors of any convenient form, preferably having substantially the same external diameter as the optical units.
The longitudinal grooves may either be straight or extend in a helical fashion around the extrudate. In the latter case they may be of opposite hand to the helically wound optical units. Also in some cases the grooves may follow an undulating path.

Claims (8)

1. An optical cable having one or more optical units wound helically around a central 85 strength member and surrounded by an outer protective sheath wherein the central strength member is coated with a plastic sheath having longitudinal grooves in its surface which provide paths for the passage of gas.
2. An optical cable according to Claim 1 including one or more electrical conductors also wound helically around the central strength member.
3. An optical cable according to Claim 2 95 including a plurality of optical units and a plurality of electrical conductors interwound with each other.
4. An optical cable according to any preceding Claim wherein the grooved sheath has 100 been extruded around the central strength member.
5. An optical cable according to any preceding Claim wherein the longitudinal grooves extend parallel to the cable axis.
6. An optical cable according to any preceding Claim wherein the longitudinal grooves extend helically around the sheath.
7. An optical cable according to any preceding Claim wherein the longitudinal grooves follow an undulating path along the sheath.
8. An optical cable of the type specified substantially as shown in and as hereinbefore described with reference to the accompanying drawing.
Printed in the United Kingdom for Her Majesty's Stationery Office, Dd 8818935, 1986, 4235Published at The Patent Office, 25 Southampton Buildings, London, WC2A 1 AY, from which copies may be obtained.
GB08530480A 1984-12-19 1985-12-11 Optical cables Expired GB2169098B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB848432122A GB8432122D0 (en) 1984-12-19 1984-12-19 Optical cables

Publications (3)

Publication Number Publication Date
GB8530480D0 GB8530480D0 (en) 1986-01-22
GB2169098A true GB2169098A (en) 1986-07-02
GB2169098B GB2169098B (en) 1988-09-14

Family

ID=10571465

Family Applications (2)

Application Number Title Priority Date Filing Date
GB848432122A Pending GB8432122D0 (en) 1984-12-19 1984-12-19 Optical cables
GB08530480A Expired GB2169098B (en) 1984-12-19 1985-12-11 Optical cables

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB848432122A Pending GB8432122D0 (en) 1984-12-19 1984-12-19 Optical cables

Country Status (4)

Country Link
EP (1) EP0186992B1 (en)
CN (1) CN1004588B (en)
DE (1) DE3572041D1 (en)
GB (2) GB8432122D0 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5157752A (en) * 1991-10-24 1992-10-20 Northern Telecom Limited Optical fiber cable with intermingled water blocking means and method of making same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4784461A (en) * 1986-11-04 1988-11-15 Northern Telecom Limited Optical cable with improved strength

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1601303A (en) * 1977-04-27 1981-10-28 Lignes Telegraph Telephon Manufacturing cable elements comprising optical fibres by a vertical machine
GB2094020A (en) * 1981-01-09 1982-09-08 Cables De Lyon Geoffroy Delore A method of manufacturing an optical fibre cable
EP0076637A1 (en) * 1981-10-06 1983-04-13 Northern Telecom Limited Optical cable
GB2123164A (en) * 1982-06-11 1984-01-25 Standard Telephones Cables Ltd Optical fibre cables

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2805276A (en) * 1951-06-22 1957-09-03 Western Electric Co High-frequency transmission cables
GB1043234A (en) * 1962-06-20 1966-09-21 Ass Elect Ind Improvements relating to electric cables
DE2163351A1 (en) * 1971-12-21 1973-06-28 Bbc Brown Boveri & Cie FLEXIBLE SINGLE LINE POWER CABLE
GB1601003A (en) * 1978-03-15 1981-10-21 Bicc Ltd Optical cable
JPS54130037A (en) * 1978-03-31 1979-10-09 Kokusai Denshin Denwa Co Ltd Optical fiber sea bottom cable and method of fabricating same
CA1093877A (en) * 1978-06-07 1981-01-20 Frederick D. King Optical waveguide cables
DE2855588A1 (en) * 1978-12-22 1980-07-03 Aeg Telefunken Kabelwerke Long range data transmission fibre optic cable arrangement - uses gaseous or liquid flow medium in optical cable hoses to drive generator turbines for booster station supply
FR2460492A1 (en) * 1979-06-28 1981-01-23 Cables De Lyon Geoffroy Delore FIBER OPTIC UNDERWATER CABLE
DE3225581C2 (en) * 1982-07-08 1986-09-11 Siemens AG, 1000 Berlin und 8000 München Communication cable for pressurized gas monitoring
GB2123978B (en) * 1982-07-12 1985-09-11 Telephone Cables Ltd Optical fibre cable

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1601303A (en) * 1977-04-27 1981-10-28 Lignes Telegraph Telephon Manufacturing cable elements comprising optical fibres by a vertical machine
GB2094020A (en) * 1981-01-09 1982-09-08 Cables De Lyon Geoffroy Delore A method of manufacturing an optical fibre cable
EP0076637A1 (en) * 1981-10-06 1983-04-13 Northern Telecom Limited Optical cable
GB2123164A (en) * 1982-06-11 1984-01-25 Standard Telephones Cables Ltd Optical fibre cables

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5157752A (en) * 1991-10-24 1992-10-20 Northern Telecom Limited Optical fiber cable with intermingled water blocking means and method of making same

Also Published As

Publication number Publication date
CN85109060A (en) 1986-06-10
GB2169098B (en) 1988-09-14
EP0186992A1 (en) 1986-07-09
DE3572041D1 (en) 1989-09-07
CN1004588B (en) 1989-06-21
GB8432122D0 (en) 1985-01-30
GB8530480D0 (en) 1986-01-22
EP0186992B1 (en) 1989-08-02

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee