FR2630834A1 - Improvement to optical links and to termination devices for such links - Google Patents

Abstract

The present invention relates to an optical link with termination devices for optical fibres coming from optical cables, these termination devices having a spreading and/or connection function. The optical link of the invention involves arranging the fibres 1, which are placed loosely in their protective sheath 11, at the outlet of the termination devices, in a sealed flexible sheath G containing, for example, an anti-microphonic substance. Application to all subscriber-connection and distribution exchanges (centres), cords, jumpers, and to all types of optical cables.

Description

 The present invention relates to an optical link, either between a fiber optic cable and an end piece of equipment, or between two optical cables.

 The present invention aims to improve the optical connections, on the one hand, by perfecting the connection proper, on the other hand, by improving the blooming and / or connection device placed at the ends of the link, this device end serving as an interface with the end equipment.

 Flourishing devices are well known. Their main function is to protect, flourish, optical fibers from optical cables to other optical cables and / or distribute them to the equipment to which they are assigned. Thus, French patent 86 05 523 of the applicant describes a spreading device comprising an end fitting which can be fixed coaxially to the end of the cable, this end fitting comprising a section of revolution having first longitudinal external grooves, in each first groove being housed one end of a protective sheath, a split ring having a longitudinal slot and surrounding said section of revolution. The aforementioned flourishing device further comprises means for tightening the split ring by narrowing the slot in order to push in and wedge the fiber protection sheaths in the first grooves.

A sheath surrounding the cable end and the end piece allows this clamping ring to be fixed to the cable.

 Such a device already has very great advantages. The present invention aims to improve this device for developing optical fibers from optical cables so that such a bursting device stops the transmission of vibrations that can generate noise.

 The invention aims to improve the quality of the optical link both at the level of the development device and at the interface link between the cable and the end equipment.

 The invention aims to implement simple means for the manipulator and particularly effective for the most disturbing frequency ranges.

 The invention aims to improve the optical connections by giving the flourishing devices, in addition to the functions already known, a connection function between fibers which can be removable.

 The optical link associated with its expansion and / or connection heads according to the invention provides multiple advantages such as great ease of pre-wiring in the workshop, a reduced cost for wiring and therefore repairs and installations at low prices and reduced time on site, specialized manipulators no longer being necessary on site. In fact, during breakdowns, the link test operations are greatly facilitated by dismantling the end heads and repairing the complete optical link in the workshop without neutralizing the optical transmission.

 The connection for optical fibers, said optical fibers 1 coming from cable ends (2, 2 ') comprises end devices t8, 8', (6, 5) (4, 5) (3, s)) placed at each end of cables (2, 2 ') (20, 20') and / or equipment at the outlet of said end devices 8, 8 ', (6, 5) (4, 5) (3, 5 )); the bare optical fibers l with clearance in their protective sheaths 11 are placed in a sheath G.

 The connection of the invention comprises a grooved sheath.

 Sheath G is a sheath formed from stapled articulated rings.

 Sheath G is a reinforced smooth plastic sheath.

 The sheath G is held by means of a thread or grooves (701, 680, 570) carried by a bore of a tubular conduit (70, 68, 57), said tubular conduit (70, 68, 57) surrounding this sheath G, said tubular conduit (70, 68, 57) cooperating with means (88, 68, 52) for making said cable end (2, 2 ', 20, 20') integral with this sheath G.

 The tubular conduit (70, 68, 57) is made integral with a spreading device (8, 6, 4, 3) by means of clamping means (88, 68, 52), said clamping means (88, 68,52) consisting essentially of a nut (88, 68, 52) resting on a shoulder of said tubular conduit (70, (68, 57).

 The spreading head 8 comprises an end piece 83 which can be fixed coaxially to the end of the cable 2, this end piece 83 comprising a section of revolution 832 having longitudinal external grooves 8322 in which are housed protective sheaths 11 which play with a fiber 1 optical, said section 832 being surrounded by a split retaining ring 84, said ring 84 having a bore 841 having grooves 842 cooperating with said grooves 8322 to hold in position the sheaths 11 containing with play the optical fibers 1, said ring 84 being itself surrounded and tightened by means of a ring 86 engaging for example by screwing around a sheath 85 surrounding said end piece 83, said ring 86 itself being surrounded by the nut 88 for fixing said sheath G , this nut 88 engaging in the thread 857 of the sleeve 85.

The spreading head 4 is essentially formed by a sheath bearing on the outer cable sheath 20 supporting a section 400 placed perpendicular to this sheath 40 at a certain distance from the free cable end 20, this section 400 comprising a plurality of passages 410 placed coaxially with said cable 20, each passage 410 receiving a half-connector 41, said sheath 40 extending in a tubular conduit beyond said section 400, said tubular conduit 42 being threaded to receive the nut 52 another ----- tip 5, the latter
tip 5 being essentially formed by a section 500 placed perpendicular to its tubular conduit 50, said section 500 comprising a plurality of passages 501, each passage 501 receiving a half-connector 51, said tubular conduit 50 cooperating with a ring 57 interposed between said conduit 50 and said nut 52 for securing the sheath G 'surrounding the fibers 1' provided with their own sheaths 11 'of said optical link.

 The spreading head comprises an end piece 33 which can be fixed coaxially to the end of the cable 2, the end piece 33 comprising a section de.révolution radiating longitudinal external grooves 3322 in which are housed the protective sheaths 11 which play with a fiber optics 1 each, said section of revolution being surrounded by a split retention ring 34, said ring 34 having a bore having grooves cooperating with said grooves 3322 to hold in position the sheaths 11 containing with play the optical fibers 1, said ring 34 being itself surrounded and tightened by means of a ring 36 engaging for example by screwing around a sheath 35 surrounding said end piece 33, said ring 36 being itself surrounded by the nut 38 for fixing the sheath G , this nut 38 engaging in the thread 381 of the sleeve 35, the end piece 33 having behind said grooves 3322 a crown 330 provided with passages 331 allowing the fixing of half -connectors 31 coaxially with said end piece 33, said crown 330 extending beyond by means of a tubular conduit 332 provided with an external thread 334, cooperating with the nut 52 of a --- end piece 5, the latter half connector 5 being essentially formed by a section 500 placed perpendicular to its tubular conduit 50, said section 500 comprising a plurality of passages 501, each passage 501 receiving a half-connector 51, said tubular conduit 50 cooperating with a ring 57 interposed between said conduit 50 and said nut 52 for securing the sheath G 'surrounding the fibers 1' provided with their own sheaths 11 'of said optical link.

 The passages (501, 401) of said sections (500, 400) serving to support said half-connectors (51, 41) of said burst heads (5, 4) are distributed in concentric circles centered around the axis of the cable 20.

 The passages (501, 401) of said sections (500, 400) serving as support for said half-connectors (51, 41) of said burst heads (5, 4) are distributed on the same circle centered around the axis of the cable 20.

 Is placed in the sheath G and / or in the end devices E8, 8 ', (4, 5) (3, 5)) an antimicrophonic product essentially formed of a gel loaded with an antimicrophonic material. The gel is a tixotropic gel for example.

 The gel is loaded with one of the following materials: fiberglass, rock fiber, cork, expanded glass beads, expanded polystyrene.

 The invention relates to a burst head for an optical link comprising means (33, 34, 35, 36, 38) for rigidly fixing to an optical cable 2, said means 33 comprising means 330 for receiving optical half-connectors 31, said means 33 also comprising behind said half-connectors 31 means 332 for cooperating with an end piece 5, said end piece 5 being essentially formed by a tubular body 50 supporting in its center the half-connectors 51 intended to be connected two in pairs with said half-connectors 31, a nut 52 cooperating with said means 332, said burst head thereby ensuring a connection function.

 Other advantages and characteristics will appear on reading the following description illustrated by drawings.

 FIG. 1 represents an overall view of an optical link according to the invention.

 FIG. 2 shows, in detailed section, a spreading head according to the invention as used in FIG. 1.

 FIG. 3 represents a variant of FIG. 1.

 Figure 4 shows, in section; a connection device with multipoint outputs according to FIG. 3.

 FIG. 5 represents, in section, a variant of the splice E of FIG. 1.

 FIG. 6 represents, in section, a spreading and connection head with multipoint output according to the invention for optical links according to FIG. 7.

 Referring to FIG. 1, an optical link, according to the invention, for connecting a cable end 2 to an end device not shown or between two cable ends (2, 2 '), essentially consists of a sheath G receiving the fibers 1 coming from the ends of cables 2, this sheath G taking support at each end of the connection in complete safety at the level of the blooming devices (8, 8 ′) as will be described in the following of the description.

 This sheath G acts as a garter; the fibers 1 are themselves surrounded by their own protective sheath 11 with a certain freedom. Around these sheaths 11, in the sheath G, there is introduced according to the invention a filling product preventing the transmission of parasitic frequencies. These filling products ensuring sound insulation are chosen appropriately as a function of the parasitic frequencies to be damped. These filling products can for example consist of mixtures based on tixotropic gel loaded with glass fiber or rock fiber. Tixotropic gel is a gel whose dynamic viscosity is lower than the static viscosity.

For example, this gel softens in the presence of vibrations.

The appropriate viscosity depends on the frequency range to be damped. The fillers to be introduced into the gel may also be organic powders, expanded glass biliys, compositions based on polybutatens or microcrystalline hydrocarbon waxes.

 Compositions based on silicone or on a petroleum derivative comprising fillers based on cork, expanded polystyrene, mica powder, or of the aforementioned type, can also respond to the insulation problem of the invention.

 The sheath G of the invention is supported at the level of a burst head of the cable 2 to be connected and extends according to the invention to another burst head 8 'identical in the example of FIG. 1 to allow connection to another 2 'cable. In the case where it is necessary to make a splice between the fibers 1 and 1 'emerging from each cable head (2, 2'), it is possible to place each group of sheath 11 (resp 11 ') containing the fibers 1 (resp 1 ') for the end 2 (resp the end 2') in a sheath G (resp G '), each group of sheaths 11 (resp 11') being surrounded by the filling product suitably chosen as mentioned above and place the splice E connecting said fibers 1 and 1 'in the sheaths G and G' abutted, these sheaths being joined by means of a sleeve M.

 The sheath G of the invention can be a composite based on hardened polymers such as copolymers of ethylene and propylene optionally mixed with chlo rosulfane polyethylene. The sheath G can also be formed on the basis of polyamide in semi-rigid plastic.

 The sheath G is advantageously chosen to be grooved or even smooth but reinforced by means of interlaced fibers, for example glass or textile or metallic fibers.

Indeed, it is necessary that the sheath G has a resistance to tensile bending torsions in order to safely protect the optical fibers it contains. It is well known that fluted sheaths, for example of the type described in application 87 07 332 of the applicant, meet these mechanical requirements.

 A sheath G formed of stapled articulated rings would also be suitable and would provide advantages during handling, for example at the level of splices when it is necessary to release the fibers which it protects. This sheath G can also be metallic and have the same characteristics of flexibility and extension.

 Referring to FIG. 2, the device for blossoming the optical fibers 1 exiting from one end of the cable 2 comprises an end piece 83 which can be fixed coaxially at the end of the cable 2 and more particularly around the stripped rod 21 it is ~ a rush cable. This end piece 83 comprises a section of revolution 832 having first longitudinal external grooves 8322. In each first groove 8322 is housed one end of protective sheath 11 containing with play an optical fiber 1. This protective sheath 11 has a diameter substantially greater than the depth of the grooves 8322 and is enclosed by a split retaining ring 84. In fact, the ring 84 surrounds the section of revolution 832 and comprises a slot, not shown, which, by its narrowing, wedges the sheaths 11 for protecting the optical fibers in the longitudinal grooves 8322. The ring 84 advantageously comprises a bore 841 having grooves 842 which can be circular, sawtooth or have any other shape allowing the sheaths 11 of the optical fibers 1 to be held in position. The not shown slot of the ring 84 has a width substantially greater than the diameter of the fiber 1. The means for tightening the ring 84 essentially consist of a tightening ring 86 having a frustoconical bore 861 cooperating with an external frustoconical surface 840 of the ring 84. The tightening ring 86 is slid longitudinally, for example by screwing around a sheath 85 surrounding the end piece 83. The end piece 83 has already been described in the aforementioned request by the plaintiff. It comprises a flange 830 having grooves 8301 aligned with the grooves 8322 receiving the optical fibers 1.

Thus, the optical fibers coming from the end 2 of the cable can run first in the grooves 301 and then in the grooves 8322. The flange 830 serves as an axial stop for the ring 84.

 It is also known that the sheath 85, cable side 2, has a bore 852 surrounding this end of cable 2 and, at its other end, a bore 851 large enough to cover the second section 831 of frustoconical shape of the end piece 83 and y enclose with sufficient space for freedom the second grooves 8314 receiving the fibers 1 from the cable 2.

 In addition, the sheath 85 has a radial slot 853 cooperating with a protruding lug 833 of the end piece 83 in order to secure the sheath 85 and the end piece 83 in rotation.

The clamping ring 86 covering the split ring 84 cooperates by screwing with the sheath 85, the screwing of the clamping ring 86 bringing the sheath 85 and the ring 84 towards each other and against respective stops not shown worn by the nozzle 83. A nut 9 shown in Figures 1 and 2 screwable around the thread 855 of the sleeve.

85 cooperates with a flange 856 of this sheath 85 to enclose a plate P. This plate P can for example be the wall or the partition of a case of a box or of a bay according to the envisaged application, as well as it will appear in the following description.

 There is, according to the invention, a second thread 857 on the sheath 85 in the vicinity of the flange 856, on the same side of the plate P as this flange or even even on this flange 856 precisely t this thread 857 allows the screwing of another nut 88 covering the tightening nut 86 along its entire length, the latter already enclosing the grooved endpiece 83 fitted with optical fibers 1 in their sheaths 11. This other nut 88 therefore has a first bore 881 meshing in the thread of the sleeve 85 on the wall side P and, at its other end, a second bore 882. This second bore 882 extends behind the nut 86 and has an appropriately chosen diameter. Indeed, bore 882 has a shoulder 883 which comes to bear on the flange 71 of a ring 7 placed coaxially at the end of the clamping ring 86 around the fibers 1 provided with their sheaths 11. Thus, when the nut 88 is screwed on, the ring 7 is crushed against the ring 86. This ring 7 comprises a body 70 bored allowing to maintain and surround the sheath G of the invention around the fibers 1 emerging from the development head 8 thanks to a thread or grooves 701 placed in the bore 700 of the body 70, this which prevents the fibers 1 from being crushed or twisted when the nut 88 is tightened. Indeed, the ring 7 is simply maintained by means of the flange 71 during the screwing of the nut 88, without damaging the sheaths 11 containing the fibers 1. A possible crimping can complete the maintenance of the sheath G around the bundle of fibers 1 sleeved 11.

 The process for introducing the sheathed fibers 1 from the spreading head 8 into the sheath G is easy to implement. A method of inserting optical fibers into a tubular conduit has been described in patent 85 10 143 of the applicant; a clamping tool, not shown, is placed around the bundle of sheathed fibers 1 and guides the sheathed fibers 1 in the sheath G without damaging them. Then, the tightening of the nut 88 secures the sheath on the bursting head 8.

 It then suffices to inject the antimicrophonic product into a recess made in the nut 88 to optionally fill the burst head 8 and to close this recess not shown in the figure.

 It is possible to introduce the antimicrophonic product at the ends, for example E splices or connecting pieces.

 Figure 3 is a variant of Figure 1 for which, on one side, the cable end 2 is spread by means of a spreading head 8 according to the invention. The fibers 1 emerging from this spreading head 8 are likewise protected by means of a sheath G of the invention containing for example the anti-vibration filling product of the invention. On the other hand, the other end of the sheath G is applied to a spreading head 4.

 --- FIG. 4 represents a variant of the spreading head 4 for an optical cable 20 with free fibers, for example in which the cable 20. is surrounded by a sheath 40.

This sheath 40 is made integral with the wall P by means of a collar 451 against which it comes to bear. On the other side of the wall P, the tubular conduit 40 has an external thread 42 which allows the screwing of a nut 91 making it possible to hold the wall P between the flange 451 and this nut 91. It will be noted that this nut 91 also comprises a plug 92 placed at the end of a chain 910, for example making it possible to plug the free end of the sheath 40, that is to say on the side opposite to the cable 20. The conduit 40 also comprises, perpendicular to its axis of symmetry, a section 400 provided with a plurality of conduits 410 or recesses substantially coaxial with said conduit 40 intended to receive the half-connectors 41. Thus, FIG. 4a represents a view of this wall 400 in its plane, therefore substantially in the wall plan P.

 The spreading head 4 for optical cable 20 of the invention thus allows to receive within it a plurality of half-connectors 41 receiving the fibers 1 from this cable and to be ready to be connected to other ends of fibers 1 '. Before connection, the plug 92 closes the duct 40 on the open side and thus protects fibers 1 and connectors 41. FIG. 4a shows a regular distribution of the recesses 410, and therefore of the half-connectors 41, over the entire circular surface of section 400 but it is obvious that the distribution of the half-connectors could be made in one or more circles.

 A tip 5 shown in Figure 4 supporting the half-connectors 51 cooperating with the half-connectors 41 of the development head 4 is essentially formed of a body 50 substantially tubular also having a cross section 500, perpendicular to its axis.

This section 500 is also provided with holes or passages 501 serving as supports for the half-connectors 51 intended to be connected to the half-connectors 41 of the head 4.

A A ring 57 abuts against a flange 53 of said tubular body 50. This ring 57 is internally provided with grooves 570 and comes to grip the sheath
G 'of an optical link according to the invention, containing fibers 1' themselves surrounded by their protective sheaths 11 '. This sheath G 'has a diameter substantially greater than the diameter of said tubular body 50. The ring 57 has a shoulder 571 against which the nut 52 comes to bear. So when you want to connect the nozzle 5
at head 4, the nut 52 is simply screwed around the thread 42 of head 4 and the respective half-connectors 51 and 41 come into contact without damaging the sheaths (G ', G) or the fibers (1', 1) A not shown cap, similar to cap 92, can allow sea iron / tubular conduit 50 of the nozzle 5-on the side opposite the sheath G.

according to the invention
A multi-point connector / (6) is shown in axial section in FIG. 5. I1 essentially comprises a substantially tubular body 60 placed on either side of a wall P. The wall P comes, for example, to bear against a flange 651 practiced around the conduit 60 in the vicinity of its middle. A nut 91 engaging in the thread 62 outside said tubular conduit 60, on the other side of the wall P, makes the multipoint connector 6 of the invention integral with the wall P. This nut 91 is often associated freely with an end plug 92 which closes one of the ends of said tubular conduit 60.

 In the plane of the collar approximately 651, transversely to the axis of the tubular conduit 60, the multi-connector 6 has a substantially full section 600, provided with passages 610, as shown in FIG. 5a in front view. These passages are also coaxial with said tubular conduit 60 and serve to receive half-connectors 61.

Thus, the fibers 1 surrounded by their sheaths 11 and the optical link of the invention are connected directly to the half-connectors 61. In fact, the sheath G of the invention surrounding these sheathed fibers 1 has a diameter greater than the diameter of said conduit tubular 60 and is applied by means of a nut 68. This nut 68 meshes with a rod 681 carried by the outer surface of said tubular conduit 60 in the vicinity of the end of the sheath G. An O-ring not shown, placed for example. between the end of the sheath G and the rod 681, for example ensures the tightness of the connector 6 of the invention. Splines 680 or a thread of the nut 680 are hooked into the sheath G.

 A tip 5, identical to that of FIG. 4, engages by means of its nut 52 in the thread 62 of its sleeve 60, thereby bringing together and connecting the respective half-connectors 51 and 61. It is understood that the distribution and the position of the passages (610, 510, or 410) are chosen appropriately so that the half-connectors (61, 51, 41) are two by two in correspondence.

 FIG. 4 thus represents an embodiment of a spreading head for the end of the cable 20 with or without a rod, therefore with a tube structure or even with a free structure, having the function of optical connection according to the invention.

 FIG. 6 represents an alternative embodiment of the spreading head 3 for cable 2 with rod according to FIG. 2 but conferring on the spreading head 3 a multipoint connection function as in the variant of FIG. 4. The description of FIG. 2 is substantially preserved for the ring parts (34, 36) for tightening on the sheath 35 placed around the conical end piece 33. The flourishing device 3 is essentially distinguished by its end piece 33 which extends on the side opposite to the cable end beyond the emergence of the fibers 1 of the grooves 3314 or more exactly of the sheaths 11 containing the said fibers 1, this end piece 33 extends in the vicinity of the axis of the spreading head 3 up to a crown 330 placed perpendicular to this axis. This crown 330 is shown in front view in FIG. 6a. It is provided with recesses or holes 331 allowing the insertion of half-connectors 31 coaxially with said spreading head 3 and said cable 2 to be bloomed. The crown 330 has a shoulder 333 against which the tightening nut 38 comes to bear to close the head 3. This nut 38 engages in a thread 357 of the sleeve 35, as in the embodiment of FIG. 2 The end piece 33 extends into a tubular conduit 332 beyond the crown 330, on the side opposite the cable end 2, this tubular conduit 332 having a thread 334 on its external surface so that the other - --- end piece 5, similar to that described in FIGS. 4 and 5, is connected and more precisely abut the respective half-connectors 31 and 51.

 Such a variant confers on the spreading head a function of multipoint connection device, the choice of the number of optical points, that is to say of connectors 31 placed on the crown 330, depending on the number of optical fibers 1 placed in the cable 2. Thus, it may be advantageous to provide a single row of connectors 31 on a circle of the crown 330 or else two rows on two concentric circles or three rows further depending on the application.

 It is understood that the abovementioned antimicrophonic product can be introduced in the same way both in the sheath G 'associated with the tip ---- 5 and at the level of the development head 3, for example at the level of a hole 380 made in the nut 38. The antimicrophonic product is injected then the hole 380 is closed in order to maintain the tightness of the optical connection thus produced.

Such an optical link is shown diagrammatically in FIG. 7.

Claims (16)

 1 - Connection for optical fibers, said optical fibers (1) coming from cable ends (2) (2 ') comprising wire end devices 8, 8', (6, 5) (4, 5) (3 , 5) placed at each end of cables (2, 2 ') (20, 20') and / or equipment, connection characterized in that at the output of said end devices t8, 8 ', (6, 5) (4, 5) (3, 5 g, the optical fibers (1) contained with play in their protective sheaths (11) are placed in a sheath (G).  2 - Connection according to claim 1 characterized in that the sheath (G) is a fluted sheath.  3 - Connection according to claim 1 characterized in that the sheath (G) is a sheath formed of stapled articulated rings.  4 - Connection according to claim 1 characterized in that the sheath (G) is a smooth reinforced plastic sheath.  5 - Connection for optical fibers according to one of claims 1 to 4 characterized in that said sheath (G) is held by means of a thread or grooves (701, 680, 570) carried by a bore of a tubular conduit (70, 68, 57), said tubular conduit (70, 68, 57) surrounding this sheath (G), said tubular conduit (70, 68, 57) cooperating with means (88, 68, 52) for rendering integral with said cable end (2, 2 ', 20, 20') of this sheath (G).  6 - Connection for optical fibers according to one of claims 1 to 5 characterized in that said tubular conduit (70, 68, 57) is made integral with a blooming device (8, 6, 4, 3) thanks to clamping means (88, 68, 52).  7 - Connection according to claim 6 characterized in that said clamping means (88, 68, 52) essentially consists of a nut (88, 68, 52) resting on a shoulder of said tubular conduit (70, 68, 57 ).  8 - Optical connection according to one of claims 1 to 7 characterized in that said spreading head (8) comprises an end piece (83) fixable coaxially at the end of the cable (2), this end piece (83) comprising a section of revolution (832) having longitudinal external grooves (8322) in which are housed protective sheaths (11) containing with play an optical fiber (1), said section (832) being surrounded by a ring (84) of split retention, said ring (84) having a bore (841) having grooves (842) cooperating with said grooves (8322) to hold in position sheaths (11) containing with play the optical fibers (1), said ring (84 ) being itself surrounded and tightened by means of a ring (86) engaging for example by screwing around a sheath (85) surrounding said end piece (83), said ring (86) being itself surrounded by the nut (88) for fixing said sheath (G), this nut (88) engaging in the thread (857) of the f Urchin (85).  9 - Optical connection according to one of claims 1 to 7 characterized in that said spreading head (4) is essentially formed of a sheath (40) bearing on the outer cable sheath (20) supporting a section (400) placed perpendicular to this sheath (40) at a certain distance from the free cable end (20), this section (400) comprising a plurality of passages (410) placed coaxially with said cable (20), each passage (410) receiving a half-connector (41), said sleeve (40) extending into a tubular conduit beyond said section (400), said tubular conduit (42) being threaded to receive the nut (52) another - ---- end piece (5), the latter --- end piece (5) being essentially formed by a section (500) placed perpendicular to its tubular conduit (50), said section (500) comprising a plurality of passages (501), each passage (501) receiving a semi-connector (51), said tubular conduit (50) cooperating with a ring ( 57) interposed between said conduit (50) and said nut (52) to secure the sheath (G ') surrounding the fibers (1') provided with their own sheaths (11 ') of said optical link.  10 - Connection according to one of claims 1 to 7 characterized in that said spreading head (3) comprises a nozzle (33) coaxially fixed to the cable end (2), the nozzle (33) comprising a section of revolution having longitudinal external grooves (3322) in which are housed the protective sheaths (11) containing with play an optical fiber (1) each, said section of revolution being surrounded by a split retention ring (34), said ring (34) comprising a bore having grooves cooperating with said grooves (3322) to hold in position the sheaths (11) containing with play the optical fibers (1), said ring (34) being itself surrounded and tightened at by means of a ring (36) engaging for example by screwing around a sheath (35) surrounding said end piece (33), said ring (36) being itself surrounded by the nut (38) fixing the sheath (G), this nut (38) engaging in the thread (381) of the sleeve (35), the end piece (33) comprising behind said grooves (3322) a crown (330) provided with passages (331) allowing the attachment of half-connectors (31), coaxially with said end piece (33), said crown (330) extending beyond by means of a tubular conduit (332) provided with an external thread (334), said thread (334) cooperating with the nut (52) of a nozzle (5), the latter nozzle (5) being essentially formed by a section (500) placed perpendicular to its tubular conduit (50), said section (500) comprising a plurality of passages (501), each passage (501) receiving a half-connector (51), said conduit tubular (50) cooperating with a ring (57) interposed between said conduit (50) and said nut (52) to secure the sheath (G ') surrounding the fibers (1') provided with their sheaths (11 ') clean of said optical link.  11 - Optical connection according to one of claims 9 or 10 characterized in that said passages (501, 401) of said sections (500, 400) serving as support for said half-connectors (51, 41) of said burst heads ( 5, 4) are distributed in concentric circles centered around the axis of the cable (20).  12 - Optical connection according to one of claims 9 or 10 characterized in that said passages (501, 401) of said sections (500, 400) serving as support for said half-connectors (51, 41) of said burst heads ( 5, 4) are distributed on the same circle centered around the axis of the cable (20).  13 - Optical connection according to one of claims 1 to 12 characterized in that one places in the sheath (G) and / or in the end devices, 8 ', (4, 5) (3, 5iz un antimicrophonic product essentially formed of a gel loaded with an antimicrophonic material.  14 - Optical connection according to claim 13 characterized in that the gel is a tixotropic gel.  15 - Optical connection according to claim 13 or 14 characterized in that the gel is loaded with one of the following materials: fiberglass, rock fiber, cork, expanded glass beads, expanded polystyrene.  16 - Burst head for optical connection comprising means (33, 34, 35, 36, 38) for rigidly fixing on an optical cable (2), characterized in that said means (33) comprise means (330 ) to receive optical half-connectors (31), said means (33) also comprising behind said half-connectors (31) means (332) for cooperating with a tip (5), said tip (5) being essentially formed a tubular body (50) supporting in its center the half-connectors (51) intended to be connected two by two with said half-connectors (31), a nut (52) cooperating with said means (332), said head burst) thereby ensuring a connection function.