JPH11132906A - Supporting apparatus for optical fiber matrix - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a supporting apparatus which can measure an index of refraction in the optional direction of a matrix. SOLUTION: The apparatus includes a table 102 fixed to a floor face, a base 1 set on the table 102 to be openable, a cylindrical body 2 supported on the base 1 to be rotatable and suspending an optical fiber matrix 10, and a driving means 3 rotating the cylindrical body 2 integrally with the optical fiber matrix 10. In measuring, analyzing an index of refraction by a prefoam analyzer, the optical fiber matrix 10 can be rotated in a suitable direction to freely change a direction of incidence of laser light. Accordingly, the index of refraction is analyzed from multi axial directions easily, so that the prefoam analyzer with high quality is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber preform supporting device for supporting an optical fiber preform (hereinafter, abbreviated as a preform).

[0002]

2. Description of the Related Art An appropriate laser beam is incident on a base material,
In order to measure and analyze the refractive index distribution of the base material, a preform analyzer has been developed and used. When measuring the refractive index distribution of the base material, for example, as shown in FIG. 7, a base material supporting device that vertically mounts and supports the base material 10 in an immobile state is used.

That is, in this base material supporting apparatus, a hole 102A into which a base material 10 is inserted is opened in the center of a table 102 supported by legs 101, and a cylindrical quartz is surrounded by the hole 102A. Tube 11 is upright. Nuts are attached to a plurality of holes (not shown) formed in the quartz tube 11, and bolts 12 are screwed to the nuts, and the base material 10 is fastened and fixed with these bolts 12. It is configured as follows.

[0004]

Therefore, the base material to be measured by such a base material supporting device is fixed to the supporting device, and the laser side is not rotated around the center axis of the base material. As long as the measurement of the refractive index distribution by the laser beam is inevitably limited to only one direction (one axis). An object of the present invention is to provide an optical fiber preform supporting device capable of measuring a refractive index in an arbitrary direction of a preform in view of the above-mentioned drawbacks.

[0005]

Means for Solving the Problems In order to solve the above-mentioned problems, the invention according to claim 1 comprises a table fixed to a floor, a rotation holding member provided on the table so as to be openable and closable, and It comprises a cylindrical body rotatably supported on the rotation holding member and suspending the optical fiber preform, and a driving means for rotating the cylindrical body integrally with the optical fiber preform. According to a second aspect of the present invention, the cylindrical body is concentrically inserted into the starting rod of the optical fiber preform so as to be integrally mounted.

[0006]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a fragmentary cutaway view showing a support device for an optical fiber preform according to the present invention. The supporting device for the optical fiber preform of this embodiment includes:
A rectangular base 1 is provided on an upper portion of a table 102, and a stepped cylindrical body 2 is rotatably mounted at the center of the base 1.

The base 1 holds the cylindrical body 2 rotatably. As shown in FIGS. 2 and 3, the base 1 is hinged so that it can be divided into two parts (two divided bodies 1R and 1L). 1A is attached, and can be fixed by a lock member such as a hook 1B when closed. Further, a plurality of (three in this embodiment) moving pillars 13 are fixedly provided on the bottom surface of the base 1, and a roller 13A is attached to the lower surface of the moving pillar 13, as shown in FIG. It is designed to engage with a groove 102B formed on the upper surface of the table 102.
In each of the divided bodies 1R and 1L, a semicircular notch serving as a hole 1C through which the starting rod 10A of the optical fiber preform 10 passes is formed at the center of the closed portion. A bearing 12 is fixed along the edge of the bearing.

[0008] Each of these divided bodies 1R and 1L includes:
The driving means 3 includes a pulley 32 on which a driving belt 31 is stretched, and a motor 33 for rotating the driving belt 31 is attached to at least one of the pulleys 32 on the divided body 1L side. The drive belt 31 is configured to support the large-diameter portion 2A of the cylindrical body 2 and press and hold the outer peripheral surface of the small-diameter portion 2B from both left and right sides.

As shown in FIG. 4, the cylindrical body 2 has a large diameter portion 2A on the upper side and a small diameter portion 2B on the lower side, and a hole 2C through which the starting rod 10A penetrates is formed in the center. Have been. In addition, the cylindrical body 2 can suspend the optical fiber 10 from the cylindrical body 2 by fixing the starting rod 10A by an appropriate means.

Therefore, according to this embodiment, if the starting rod 10A of the optical fiber preform 10 previously passes through the cylindrical body 2 so as to pass through the hole 2C, the starting rod 1
OA is fixed by an appropriate means. Thereby, the cylindrical body 2
Since the optical fiber preform 10 is suspended from the base 1, when the base 1 is opened, the cylindrical body 2 is lowered from above to the central opening of the base 1 and lowered to a predetermined height. By the way, the base 1 is closed, and when completely closed, the hook 1B
Fix firmly with etc. As a result, the cylindrical body 2 is firmly held by the left and right drive belts 31, and the axes of the base 1 and the optical fiber 10 are aligned.

Therefore, when the motor 33 is operated, the rotating body 2 and the optical fiber preform 10 can be slowly rotated by the rotating drive belt 31.

Next, a second embodiment according to the present invention will be described. In this embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description will not be repeated.
In this embodiment, as shown in FIG. 5 and FIG. 6, a plurality (four in this embodiment) of rotation-free rotating plates 34 are equiangularly arranged on the upper surface of the base 1 'as a driving means. A ring-shaped friction member 34A made of rubber or the like is fixed to the upper surface edge of the rotary plate 34. In addition,
One of the rotary plates 34 is forcibly rotated by a motor 33.

An engaging member 2'D made of a similar material and engaging with the friction member 34A is fixed to the lower-diameter edge of the large-diameter portion of the cylindrical body 2 'opposed thereto.

[0014]

As described above, according to the present invention, according to the present invention, a table fixed to a floor, a rotatable holding member provided on the table so as to be openable and closable, and rotatably supported by the rotatable holding member. , A cylindrical body integrally attached to the starting rod of the optical fiber preform, and a driving means for driving the cylindrical body to rotate integrally with the optical fiber preform. The refractive index is measured and analyzed by a preform analyzer. In this case, since the optical fiber preform can be rotated in an appropriate direction to freely change the direction in which the laser beam is incident, it is possible to easily realize a refractive index analysis from multiple axial directions, and to increase the height. A quality preform analyzer is obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an optical fiber preform supporting device according to the present invention.

FIG. 2 is a plan view of the device.

FIG. 3 is an explanatory view showing an operation of a base of the apparatus.

FIG. 4 is a sectional view of a main part of the device.

FIG. 5 is a plan view showing another embodiment.

FIG. 6 is a cross-sectional view of the same device taken along line VI-VI.

FIG. 7 is a schematic sectional view showing a conventional example.

[Explanation of symbols]

 Reference Signs List 1, 1 'base (rotation holding member) 2, 2' cylindrical body 3, 3 'driving means 31 driving belt 34 rotating plate 10 optical fiber preform 10A starting rod 102 table

Claims (2)

[Claims] 1. A table (102) fixed to a floor, a rotation holding member (1) provided to be openable and closable on the table (102), and rotatably supported on the rotation holding member (1). A cylindrical body (2) for suspending the optical fiber preform (10); and a driving means (3) for rotating the cylindrical body (2) integrally with the optical fiber preform (10). An apparatus for supporting an optical fiber preform, comprising: 2. An optical fiber preform (1) comprising: a cylindrical body (2);
2. The optical fiber preform supporting device according to claim 1, wherein the optical fiber preform supporting device is configured so as to be concentrically inserted into the starting rod (10 </ b> A) and attached integrally.