JPS62272208A - Fusion splicing device for constant polarization optical fiber - Google Patents

Abstract

PURPOSE:To reinforce the connection of optical fibers without twisting the fibers by fitting a twist preventing device to a fusing machine after fusing the optical fiber cores to clamp the cores so as not to rotate the cores round respective axes and then removing the device from the fusing machine. CONSTITUTION:After fusion splicing the optical fiber cores 10, the twist preventing device 40 is set up on stands 54 for a splicing device body 16. Then, the cores 10 are clamped down on the outsides of respective rotary mechanisms 24 by clamping means 56 and then rotary clamps 29 are opened. After the end of screening, fiber clamps 20 and sheath clamps 22 are opened. Since the rotary mechanisms 24 are inclined in the front down direction, the spliced optical fiber core 10 is formed like a V-shape having a large aperture, and when the cores 10 are removed from the device 40, a sag is generated. Therefore, the left and right halves 43, 44 of an arm 42 are slightly opened to remove the sag. Then, the whole device 40 is removed from the body 16 while clamping the cores 10. Then, the spliced part is reinforced without twisting the cores.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] This invention relates to a fusion splicing device for dual polarization optical fibers, and in particular, to a splicing device for dual polarization optical fibers after fusion splicing. The invention relates to a mechanism for preventing twisting.

[Background of the Invention] In FIG. 1, lO is the entire optical fiber core, 12
is an optical fiber, and 14 is a sheath part.

Further, 16 is a main body of the connecting device, and 18 is a discharge electrode.

The optical fiber 12 is held down by a fiber clamp 20, and the sheath portion 14 is held down by a sheath clamp 22, thereby adjusting the center of the optical fiber 10 in the x and y directions and in two directions.

A rotation mechanism 24 is provided as a feature unique to a constant polarization optical fiber.

The fixed part 3 of the rotating clamp 29 is attached to the tip of the fixed arm 26.
0 and an IIf moving part 32 of a rotary clamp 29 are provided at the tip of the movable arm 28, and by rotating the cam 34, the optical fiber core 10 is laterally sandwiched between the rotary clamp 29.

Using the dial 36, while clamping the optical fiber core 10, rotate the entire arm 26 and 28 around its axis to align the birefringence axis (θ axis).Note that the birefringence axis (θ axis) is aligned using a motor rather than a manual operation. In some cases, it may be rotated automatically.

[Problems to be Solved by the Invention] When the θ-axis is aligned as described above, twist is applied to the outer optical fiber from the one-turn clamp 29.

After fusion, the optical fiber core 1110 is removed from the fusion splicer and the joint is reinforced. In order to remove the core 10 from the fusion splicer, a fiber clamp 20° and a sheath clamp 22 are used.
When all of the one-turn clamps 29 are released, the torsion is removed.
It will be added directly to the connection.

Since the characteristics of a polarization-controlled optical fiber are sensitive to torsion at the connection portion, it is desirable to reinforce the connection portion in a state where no torsion is applied to the connection portion.

[Means for Solving the Problem] The present invention attaches a torsion prevention device 40 to the fusion splicer after welding the optical fiber coated wire 10, thereby clamping the optical fiber coated wire 10 so that it cannot rotate around its axis. The above-mentioned requirement is satisfied by having the fusion splicer and then removing it from the fusion machine.

[Embodiment] In FIGS. 1 and 2, reference numeral 40 denotes a torsion prevention device, which as a whole consists of an arm 42 and a clamping means 56, which will be described first.

The 7-mem 42 is, for example, an elongated bar-shaped member with a square cross section. Can be divided into left half 43 and right half 44, left half 4
The end of the right half 44 is slidably fitted onto the connecting rod 46 protruding from the end surface of the right half 44, and the sliding range is limited by the pin 48 attached to the connecting rod 46 and the long hole 50 formed in the right half 44 Limited.

Clamping means 56 are made to protrude from both ends of the arm 42.

FIG. 2 shows an enlarged cross-section taken along line II--■ in FIG. 1.

58 is a round bar-shaped shaft, the base of which is fixed to the arm 42;
A U-shaped yt60 is formed at the tip.

The optical fiber core 10 is inserted into this groove 60.

A sleeve 62 is slidably placed over the shaft 58. Its base part is slidably inserted into the four parts 41 provided on the arm 42, and is biased to the left in FIG. 2 by a spring 64.

A pin 66 is attached to the shaft 58 and engaged with a long hole 68 provided in the sleeve 62 to prevent the sleeve 62 from coming off and to limit the range of movement of the sleeve 62. sleeve 6
An operating knob 70 is fixed to 2.

Put your finger on the knob 70, move the sleeve 62 toward the arm 42 (the state shown in FIG. 2), insert the optical fiber core 10 into the groove 6o, and release your finger.
It returns with a force of 4, and the optical fiber core 10 is inserted into the groove 6 with its tip.
Press it against the side of 0 and clamp it. As a result, the optical fiber core 10 cannot rotate around the axis.

On the top surface of the connection device main body 16, there are two wooden round bar-shaped slots. Kendo 54 Keep it upright.

The long hole 52 provided in the arm 42 is fitted into it, and the entire torsion preventing device 4o is detachably attached to the connecting device main body 16.

[Work] (1) After the fusion splicing of the optical fiber core 10 is completed.

As described above, the twist prevention device ff140 is set on the stand 54 of the connection device main body 16. Then, the clamping means 56 holds the optical fiber core mlO in each rotating mechanism 2.
Clamp on the outside of 4.

(2) Then, open the rotating clamp 29. After the screening is completed, further open the fiber clamp 20° and the sheath clamp 22.

(3) Since the rotation mechanism 24 is tilted downward, the connected optical fiber core 1o has a large V-shape, which allows it to be removed from the device and slackened.

Therefore, the left half 43 and right half 44 of the arm 42 are slightly opened to eliminate slack.

Then, the entire torsion prevention device 2t40 is removed from the connection device main body 16 while the optical fiber core wire 10 is still clamped.

Then, reinforce the connections.

1. Effects of the invention] Constant polarization optical fiber that is sensitive to twisting of the connection.

It becomes possible to reinforce the bond while it remains fused.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view of an embodiment of the present invention, and its II-
An enlarged cross section of II is shown in FIG. lO: Optical fiber core wire 12: Optical fiber 14: Sheath portion 16: Connection device body 20: Fiber clamp 2
2-screw clamp 24: Rotating mechanism 26: [7i
I constant arm 28: Movable arm 29: Rotating clamp 3
0: Fixed part 32: Movable part 40: Torsion prevention device fi42: Arm 46: Connection line 56: Clamping means 58: Shaft
60: groove 62 sleeve

Claims (2)

[Claims] (1) In a polarization-controlled optical fiber fusion splicer equipped with a mechanism capable of clamping the optical fiber core and rotating it around its axis, a torsion prevention device has clamping means attached to both ends of an elongated arm. The arm can be detachably attached to a stand provided on the main body of the connecting device, and when the arm is attached, the optical fiber can be clamped at the tip of the clamping means. A fusion splicing device for polarization-controlled optical fibers, characterized by the following. (2) The fusion splicing device for polarization-controlled optical fibers according to claim 1, wherein the arm is extendable and retractable in the length direction.