Submarine optical fiber line with interconnected different cable types

• US 4,836,641 A
• Filed: 07/11/1988
• Issued: 06/06/1989
• Est. Priority Date: 07/27/1987
• Status: Expired due to Fees

• Current Assignee: Societa' CAVI Pirelli SPA
• Original Assignee: Societa' CAVI Pirelli SPA
• Inventors: Priaroggia, Paolo G.
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): HEALY, BRIAN
• Application Number:
  US07/217,565
• Time in Patent Office: 330 Days
• Field of Search: 350/96.20, 350/96.21, 350/96.22, 350/96.23, 174/70 R, 174/70 S
• US Class Current: 385/100
• CPC Class Codes: G02B 6/4427 Pressure resistant cables, e.g. undersea cables
• CPC Class Codes: G02B 6/4448 Electro-optic

Abstract

A submarine, optical fiber telecommunication line having optical fiber cables with external armor interconnected with optical fiber cables with only internal armor by opto-electronic repeaters and tubular bodies. The repeaters, the tubular bodies and the cables can withstand the tensile and hydrostatic stresses to which they are subjected during laying and after laying. At the shore ends, the repeaters are mechanically connected at one of their ends to cables with external armor. The other ends of the repeaters are mechanically connected to the tubular bodies which are mechanically connected to the sheaths and the internal armor of cables with only internal armor. The tubular body has an internal partition to which the internal armor is mechanically connected and has an internal sealing plug for preventing axial flow of water.

Claims

1. A submarine optical fiber cable line comprising:

an opto-electronic repeater having a water-tight envelope, said envelope being made of materials and having dimensions which permit it to withstand stresses imparted to it while it is being laid underwater and after it is laid underwater;

at least two submarine optical fiber cables connected at their ends to, respectively, one end of said repeater and the other end of said repeater, at least one of said cables connected to said repeater being an optical fiber cable having a central rope capable of withstanding the stresses imparted to the cable during laying, having longitudinally extending optical fibers disposed around said rope and having a sheath around said optical fibers, said one cable being without armor outside said optical fibers capable of withstanding, by itself, the stresses imparted to said one cable during laying and after it is laid; and

a tubular body intermediate and interconnecting said one cable with said repeater, said tubular body being mechanically connected at one end to said envelope, being mechanically connected at its other end to said sheath and having a strength sufficient to withstand the stresses imparted thereto by said repeater and said one cable and by the water in which it is laid, said tubular body having a rigid partition secured thereto and extending transversely to the bore of said tubular body, said partition being mechanically connected to said rope and having a strength sufficient to withstand the stresses imparted to said rope during the laying of said one cable and after it is laid and said partition having at least one through-opening for the passage of said optical fibers of said one cable.

2. A submarine line as set forth in claim 1 further comprising fluid sealing means within said tubular body for preventing axial flow of fluid in the bore of said tubular body.

3. A submarine line as set forth in claim 1 wherein said tubular body comprises at least two tubular sections, wherein said partition is a plate intermediate said sections and extending transversely to the axes of said sections, said sections being mechanically secured to each other and holding said plate therebetween and wherein there are securing means secured to said rope and to said plate for mechanically connecting said rope to said plate and withstanding the stresses applied thereto by said rope.

4. A submarine line as set, forth in claim 2 wherein said plate has a through-hole which said rope extends and said securing means comprises a pair of clamps respectively at opposite sides of said plate and clamped onto said rope, at least one of said clamps engaging said plate.

5. A submarine line as set forth in claim 2 wherein said repeater has optical fibers extending therefrom into said tubular body and said one cable has its optical fibers extending into said tubular body and wherein said fluid sealing means comprises a sealing body of polymeric material between said optical fibers extending from said repeater and said optical fibers extending from said one cable, said sealing body being in water-tight engagement with said tubular body and having a plurality of axially extending optical fibers embedded therein with end portions thereof extending from opposite ends of said sealing body, the last-mentioned said optical fibers having respective end portions connected respectively to said optical fibers extending from said repeater and to said optical fibers extending from said one cable.

6. A submarine line as set forth in claim 4 wherein said sealing body is disposed intermediate said partition and said optical fibers extending from said one cable.

7. A submarine line as set forth in claim 5 wherein said tubular body comprises three tubular sections, a first section being connected to said repeater, a second section being connected to said sheath and a third section being disposed intermediate and being connected to and held between said first section and said second section and wherein said sealing body substantially fills said third section.

8. A submarine line as set forth in claim 1 wherein any otherwise empty space within said tubular body is filled with a water-repellent grease.