JPH02304405A - Optical fiber holder and connecting method for optical fiber using same - Google Patents

Abstract

PURPOSE:To obtain the excellent operability of low-loss light connection and to reduce the size weight, and cost by providing a holder made of synthetic resin where a core which is exposed with its jacket part peeled is inserted and held together with the optical fiber. CONSTITUTION:The optical fiber holder 2 is made of synthetic resin and an optical fiber holding part 3 is provided as a circular hole whose diameter is large enough to insert and hold a specific number of optical fibers 1. A core holding part 5 is provided successively to the optical fiber holding part 3 as a thin hole which is large enough to insert and hold the core 6 exposed with its jacket part 4 peeled. Further, a thin-pipe holding part 7 is larger in diameter than the core holding part 5 and linked with the core holding part 5 to size which is large enough to fit a thin pipe 8, which is made of metal or ceramic; and a thin hole 9 which communicates with the core holding part 5 is bored almost to the diameter of the core holding part 5 and generates the thin pipe holding part 7 to hold the tip of the core 6, thereby fitting the thin pipe 8. Consequently, the inexpensive, small-sized, and lightweight holder with excellent operability is obtained.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to an optical fiber holder that has excellent adhesive strength and stability over time, and is used mainly for fixing optical fibers to the input/output portion of a leading waveguide component. This article relates to the method of connecting the optical fibers used.

(Prior Art) Various optical waveguide type members are used as components for using light such as optical communication and optical measurement. As shown in FIG. 5, the tip of the core wire 6 of the optical fiber wire 1 is inserted into the waveguide by sandwiching the optical fiber wire (with the jacket portion 4 attached) between the V-shaped grooves 24 provided in a pair of Si crystal plates 23. Alternatively, as shown in FIG. A connection method (ruby bead method) in which the jacket portion 4 of the optical fiber wire 1 is peeled off and the exposed core wire 6 is inserted, and the ruby beads 25 are bonded to the substrate 19 with an adhesive 26 so as to accurately face the waveguide. ) etc. are being carried out. However, these connections provide low optical loss connections, good workability, small size, light weight,
It is hoped that it will be inexpensive.

(Problems to be Solved by the Invention) However, the 5i-V groove method requires a large number of steps such as patterning and etching of the 7-shaped groove, and requires a long time for assembly. Accurately setting the intervals requires sophisticated control technology, which raises the problem of high costs. In addition, the ruby bead method (Megata et al., “Pr.
actual Method for Attacbi
ng Fiber to Waveicle
ng RubyBead”, Dingech Dig
est 1st)ficro-Optics
Conf.

'87 (rokvo Japan) 1987, pap
114), in a temperature increase/decrease test at around 60 to 70°C, ruby beads separated from the end face of the substrate at 68°C, leaving a reliability problem. If stress such as twisting is applied to the core wire, the stress will concentrate near the boundary between the ruby bead and the core wire or the boundary between the optical fiber jacket and the core wire, as it does not have a protective structure, and the core wire will likely break. There's a problem.

SUMMARY OF THE INVENTION The present invention aims to solve the above-mentioned problems and to provide an inexpensive and easy-to-operate means in which the change in light supply efficiency with respect to temperature changes is extremely small.

(Means for Solving the Problem) In order to solve the above problem and achieve the above object, the inventors of the present invention, as a result of intensive research, have peeled off the jacket part and inserted and held the exposed core wire together with the optical fiber wire. It has been discovered that the object can be achieved by providing a holder made of a synthetic resin that can be used to form a holder, and by bonding this boulder to a substrate using an adhesive that is the same as or of the same type as the synthetic resin that forms the holder. I was able to complete it. That is, a first embodiment of the present invention includes an optical fiber wire holding section, a core wire holding section connected to the optical fiber holding section and provided with a smaller diameter than the optical fiber holding section and into which the core wire is inserted;
A metal or ceramic material having a thin tube holding part connected to the core wire holding part and having an enlarged diameter formed therein, having a pore having approximately the same diameter as the core wire holding part, and being fitted into the pore holding part.・This is an optical fiber holder made of synthetic resin, which consists of a thin tube made of aluminum.The second embodiment is a synthetic resin optical fiber holder of the first embodiment, in which the jacket part of the tip of the optical fiber wire is inserted. Insert the optical fiber wire that has been peeled to expose the core wire, and align the tip of the core wire with the optical waveguide,
This is a method of connecting optical fibers to an optical waveguide substrate using the same material or adhesive of the same type as the material of the optical fiber holder.

(Example) Next, an example of the present invention will be described based on the attached drawings.

FIG. 1 is a side sectional view showing an embodiment of the holder of the present invention;
FIG. 2 is a perspective view showing an example of the manufacturing method of a holder which is an embodiment of the holder of the present invention, FIG. 3 is a perspective view showing an example of connection of the optical fiber wire of the present invention, and FIG. 1 is a holder of the present invention. It is a figure which shows the example of a temperature raising/lowering test result in an example of use.

First, as shown in Fig. 1, 1 is an optical fiber wire, 2 is an optical fiber holder, which is made of synthetic resin such as ultraviolet curing resin such as modified acrylate; It is composed of various parts such as. That is, 3 is an optical fiber wire holding section,
The hole is provided as a circular hole having a diameter of 1.8 mm and a length of 41 WI, into which a predetermined number of optical fiber wires 1 with the jacket portion 4 covered can be inserted and held. 5 is
The core wire holding portion has a size capable of inserting and holding the core wire 6 exposed by peeling off the jacket portion 4 of the optical fiber wire 1, for example, a diameter of 1.2 rrrrn and a length of 2.5 m.
The pores are connected to the optical fiber wire holding section 3 as pores of about m size. Reference numeral 7 denotes a thin tube holding portion, which is larger in diameter than the core wire holding portion 5 and has a size such that a thin tube 8 described later can be fitted therein, for example, a diameter of 1.5 mm and a length of about 2.5 mm. It is connected to. 8 is a thin tube made of metal or ceramic, and has a pore 9 in the center that communicates with the core wire holding portion 5 when the thin tube 8 is fitted into the thin tube holding portion 7.
The diameter of the core wire 6 is approximately the same as that of the optical fiber boulder 2, and it is fitted into the thin tube holding section 7 to hold the tip of the core wire 6. By fitting the thin tube 8, the core wire 6 of the optical fiber boulder 2 generates less heat. This prevents damage caused by

Next, when manufacturing the optical fiber holder shown in FIG. 1, as shown in FIG.
For example, a cylindrical part 14 (optical fiber wire holding part) with a diameter of 1.8 mm and a length of 4 mm is attached to a cylindrical base 13 with a diameter of 3 m and a length of 3 m in the hole 11 of an acrylic plate mold 10 in which many 1W+ holes 11 are bored. 3) in a row, and the tip has a diameter of 1.2
A shaft-type bottle 12 consisting of cylindrical tip portions 15 (becoming the core wire holding portion 5) with a length of 3 mm and a diameter of 1.5 m with a hole 17 into which the tips of the tip portions 15 can be inserted. 3.5m
A mold pin 18 consisting of a cylindrical mold cap 16 and a mold cap 17 are attached to the tip 15 of the shaft-shaped bottle 12.
A mold release agent is applied to the hole 11 of the mold 10 coated with the mold release agent.
The mold 10 and the mold pin 18 are inserted into the mold from below, and modified acrylate, which is an ultraviolet curing resin, is inserted from above.
The resin is injected into the gap between the two and irradiated with ultraviolet light to harden the resin. After curing, pull out the mold cap 17 by pinching the tip of the mold 10 that protrudes from the upper surface of the mold 10, pull out the shaft mold bottle 12 from below, and pull out the molded optical fiber holder 2 from the hole 11. Manufacture optical fiber holders by.

The optical fiber holder 2 manufactured using modified acrylate as described above is provided with a ceramic material having an outer diameter of 1.5 mm.
A thin tube 8 having a length of 2.5 mm and a pore 9 of 1.2 mm in diameter.
is inserted into the thin tube holding part 7, and the optical fiber wire 1 with the core wire 6 exposed by peeling off part 4 of the jacket 1 by about 301111111 is inserted with the core wire 6 first. - optical fiber holder 2 through pore 9 of capillary tube 8;
Leave it in a state where it slightly protrudes outside, and polish the tip of the core wire 6 together with the holder surface to make it flush with the holder surface.

Optical fiber holder holding this optical fiber wire 1
As shown in FIG. 3, the two end faces are placed on an optical waveguide substrate 19 made of LiNbO3 with end face blocks 20 made of 1.1Nb03 attached to the upper and lower ends, so that the core wire 6 is exactly facing the optical waveguide. , by using an ultraviolet curable resin such as "358" (manufactured by LOCTIE Co., Ltd.) at the connection part 21 with the substrate 19, and at the other end 22.
The optical fiber wire 1 was also bonded to the optical fiber wire 1 in the same manner.

Optical fiber holder 2 and substrate 19 obtained in this way
Connection stability against temperature changes, between? & 200
A total of 8 temperature raising/lowering tests were conducted over the course of the test, and changes in insertion loss were examined. An example of the test results for one cycle is shown in Figure 4, and all of the eight tests were ±0.1 dB.
Good results were not obtained.

In addition, using a stick to the modified acrylic resin 1 with a diameter of 1.4 mm and a length of 20 mm, one end was attached to L+ with the ultraviolet curing adhesive.
The rod was adhered vertically onto a NbO3 plate, and after curing, a thread was wound around the center of the rod, a spring was attached to the other end, and the rod was pulled to perform a pull-down test. As a result, the pulling strength was 700g.
It was more than r.

Comparative Example A rod with a diameter of 1.4 mm and a length of 20 mm was manufactured using zirconia, alumina, an insulating tube, and Stycast, and a pull test was conducted in the same manner as in Example 3. The result is
Zirconia: 210gr, Alumina: 200gr
, insulation tube 160gr, and Stycast 80gr.

(Effect of the invention) The present invention is an optical fiber holder made of synthetic resin,
Since the connection method is to connect to the board using the same adhesive or the same type of adhesive as the holder material, it is possible to obtain a holder that is inexpensive, small, lightweight, and has good workability. It is possible to connect an optical fiber optical waveguide with very little change in insertion loss due to changes in the insertion loss, and it will not come off or break.Since a thin metal or ceramic tube is fitted at the tip of the holder, there is no possibility of deformation due to heat generation. Remarkable effects have been recognized, including the ability to prevent adverse effects.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing an embodiment of the holder of the present invention;
Fig. 2 is a perspective view showing an example of manufacturing a boulder which is an embodiment of the holder of the present invention, Fig. 3 is a perspective view showing an example of connection of the optical fiber wire of the present invention, and Fig. 4 is a holder of the present invention. FIG. 5 is a perspective view showing a conventional connection example, and FIG. 6 is a perspective view showing another conventional connection example. DESCRIPTION OF SYMBOLS 1... Optical fiber wire, 2... Optical fiber holder, 3... Optical fiber wire holding part, 4... Jacket part, 5... Core wire holding part, 6... Core wire, 7... Thin tube holding part, 8... Thin tube, 9... Fine hole, 10... Mold, 11... Hole, 12... Shaft pin, 16... Shape cap, 19... Optical waveguide ) Substrate, 21...Connection part, 23...Si crystal plate, 25...Ruby beads Patent applicant Sumitomo Metal Mining Co., Ltd. agent Press 1) Yoshihisa 1'-[3, Concubine Ko-yo No. Figure 1 Figure 3 Figure 4 Time (minutes)

Claims (2)

[Claims] (1) an optical fiber wire holding section, a core wire holding section that is connected to the optical fiber wire holding section and is provided with a smaller diameter than the optical fiber wire holding section and into which the core wire is inserted; An optical fiber holder made of synthetic resin, which has a thin tube holder formed therein, and a metal or ceramic thin tube that has a pore having the same diameter as the core wire holder and is fitted into the thin tube holder. (2) In a method of connecting an optical fiber used with an input/output part of an optical waveguide type member, an optical fiber line holding part, a core wire holding part that is connected to the optical fiber line holding part, is provided with a smaller diameter than the optical fiber line holding part, and into which the core wire is inserted. , a metal or ceramic having a thin tube holding portion connected to the core wire holding portion and having an enlarged diameter formed therein, having a pore having the same diameter as the core wire holding portion, and being fitted into the thin tube holding portion; Insert the optical fiber line with the core wire exposed by peeling off the jacket part at the tip of the optical fiber line into an optical fiber holder made of synthetic resin, which consists of a thin tube made of plastic, and align the tip of the core line and the optical waveguide accurately. A method for connecting an optical fiber, characterized in that it is bonded to an optical waveguide substrate using an adhesive that is the same as the material of the optical fiber holder or of the same type.