JPS5823007A - Reinforcing method for connected part of optical fiber core - Google Patents

Abstract

PURPOSE:To obain a reinforced part having a high reinforcing effect in a short time by holding a heat melting type adhesive, an induction heating element and the connected part of optical fiber cores in a reinforcer composed of a receiver having a long groove and a pressing lid and melting the adhesive by induction heating to unite the receiver and the lid to a body. CONSTITUTION:A reinforcer 1 consists of a receiver 3 having a shallow groove 6 and deep grooves 8, a filmlike induction heating element 9 and a pressing lid 4. A heat melting type adhesive 10 is held in the receiver 3 of the reinforcer 1, and optical fiber cores 7 are thrust while applying tension in the longitudinal direction so that the connected part 5 of the naked optical fibers is positioned at the center of the shallow groove 6 and the core parts 7 are positioned at the deep grooves 8. The lid 4 is then out on the receiver 3, the adhesive 10 is melted by induction-heating the heating element 9 with an external high frequency induction heater, and the molten adhesive is solidified to unite the receiver 3 and the lid 4 to a body. Thus, a reinforced part having a high reinforcing effect is obtd. in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for reinforcing the connection portion of an optical 7-eyeper used in an optical transmission line. .

Optical fibers fusion spliced by discharge fusion method etc.
The coating layer of the optical fiber core wire at the spliced portion has been removed, and the strength of the fusion spliced portion of the optical fiber wire has decreased. ;
As the N/l10VC decreases, the strength of the optical fiber decreases and reinforcement becomes necessary.For this reason, in the past, the *& part of the optical fiber concentrator was placed in a reinforcing device made of plastic or glass, and the cyano The conventional method of reinforcing the joints is by injecting an adhesive such as acrylate resin, epoxy resin, or silicone resin and fixing the joint to a reinforcing device.

However, since this method uses a chemical reaction to cure the adhesive, the transmission loss of the optical fiber is easily affected by subtle differences in the atmosphere and the uncured state of the adhesive. The disadvantages include that the reinforcement work is long, the transmission loss is not stable over long periods of time, and the adhesive is not stable during storage.

In addition, since the holding force of the m-rape to the optical fiber core 11 is not sufficient, even if a relatively weak external force is applied, the optical fiber core ←
This invention was made in view of the above circumstances, and it allows work to be done in the spare time, has a high reinforcing effect, and does not affect the stability of optical fiber transmission. The purpose of this is to provide a method for reinforcing optical fiber connections.The reinforcing device consists of a pedestal with a long groove formed thereon and a holding lid that covers the long groove. The optical fiber core wire connected to the body is placed in the long part of the reinforcing device, and induction heating is applied from the outside to heat the upper conductor and the above-mentioned melt adhesive is applied. The special grade is that the optical 7-IPA core wire connection part and the reinforcing device are integrated by melting the fibers.

The present invention will be described in detail below with reference to the drawings. Fig. 1 shows an example of a reinforcing device used in the reinforcing method of the present invention, and reference numeral 1 in the figure indicates the reinforcing device. This reinforcing device 1 includes a pedestal 8 in which a long groove portion 2 is formed in an elongated columnar body;
It consists of a plate-shaped holding pot 4 that covers the long groove portion 2 of this pedestal 8. The long groove w12 of the pedestal 8 is provided in a shallow groove part 6 having a V-shaped cross section in which the connection part 6 of the fusion-spliced optical fiber wire is housed, and in both of this shallow groove part 6, and is provided in both of the shallow groove part 6 and the optical fiber core 7. It is divided into deep IF parts 8, 8 each having a U-shaped cross section. The presser lid 4 is an elongated plate and is formed to fit snugly into the pedestal 8.

The pedestal 8 and the presser foot 4 are made of synthetic resins such as saturated polyester resin, polycarbonate resin, AB8 resin, silicone resin, melamine resin, and epoxy resin, and these synthetic resins are made of glass fiber, charcoal, etc. It is made of fiber-reinforced synthetic resin, ceramics, glass, metal, etc., and the pedestal 8 and presser foot ii4 may be formed integrally, depending on lj1'/c.

As shown in FIG. 2, the reinforcing device 1 constructed in this manner has a film-like induction heating element 8 provided on the shallow groove portion 6 and the deep groove portion 8.8 of the pedestal 8 and on the inner surface of the presser foot *4. . This induction heating element 9 is a material that generates heat due to iw flow loss or hysteresis loss when a high frequency field is applied, and is made of iron,
cobalt, nickel, aluminum, silver, zinc, tin,
Electrical conductors such as lead, tungsten-molybdenum, manganese, magnesium, tantalum, and carbon, and magnetic materials such as ferrite are used. These electrical conductors and magnetic materials are formed in the form of a VC film or a thin film on the inner surfaces of the pedestal 8 and the presser pot 4 by a method such as a metal casting method, a vapor deposition method, or an ion sputtering method. Moreover, among the above-mentioned electrical conductors, a metal foil with good malleability may be formed and this metal foil may be adhered to the inner surface of the pedestal 8 and the presser foot ik4.

In this way, inside the reinforcement 61 provided with the film-like induction heating element 9, hot-melt adhesives such as thermoplastic resins such as polystyrene resin, polycarbonate resin, and fluororesin, natural rubber, black taprene rubber, and nitrile are used. rubber, 8
Prepolymers of thermosetting resins such as rubbers such as 8R, engineered mexi resins, phenolic resins, unsaturated polyester resins, alkyd resins, urea resins, melamine resins, 7 run resins, urethane resins, silicone resins, diallyl phthalate resins, etc. Oligomers or modified products or mixtures of these thermoplastic resins, rubbers, and thermosetting resin prepolymers are used.

Next, the connected optical fiber core &i7 is held on the pedestal 3 of the reinforcing device 1. First, the connection part 5 of the light 7 ends is placed in the center of the shallow groove part 6, and the Ib@7 is placed in the deep parts 8, 8 and pushed into the bottom of the groove.

At this time, a slight tension of 1 level is applied in the longitudinal direction of the optical fiber.

Next, the presser foot 1Ik4 is placed over the pedestal 31C, and a high-frequency magnetic field is applied from the outside using a high-frequency induction heating device (not shown) @IK. By this operation, the film-shaped induction heating element 9 generates heat, and the hot melt #S type adhesive 1 inside the reinforcing device 1
0 is heated to soften and melt. The melted hot-melt adhesive 10 is applied to the shallow groove portion 6 and the deep groove! 8. Fill the space around the optical fiber core placed at 8.8. Is the optical fiber connected to the bare optical fiber by the cooling or curing reaction of the hot-melt adhesive 10? The portion 5 and the optical fiber core 7 are joined to the base 8 and the presser foot 4 via the heat-melting adhesive 10, and are integrated. Through the above operations, the optical fiber connecting portion is reinforced. This state is shown in FIG. 3 and the reference figures.

In the above description, the film-shaped induction heating element 9 is provided on the inner surface of the pedestal 8 and the presser foot ii4, but is not limited to this.As shown in FIG. A similar effect can be obtained by using No. 11.

In addition, as shown in the figure, v optical fiber strand connecting portions 6 are connected to a reinforcing device 12 in which shallow grooves s6 and sludge grooves 8 are formed. The connected optical fiber cores @7 may be reinforced at the same time.

The present invention will now be explained in detail with reference to Examples.

It was made of 30% glass fiber-containing phenolic resin. The dimensions of the pedestal 8 are vertical JwqWA3jw.
x, length 10 fins, length 2 fins, width 3 ms for presser 4
The length was 60 vat. The inner surface of the pedestal 8 and the presser foot Ik4 of this reinforcing device 1 has a thickness as an induction heating element 9! ;0pvn
A film of aluminum was adhered thereto, and a resin film of nylon 12 copolymer having a thickness of 200 pm was provided as an adhesive 10 on the outside of the aluminum. Then, after removing the plastic NNII and splicing the optical fiber strands by arc discharge or the like, the optical fiber core is held on the pedestal 8 by applying a slight tensile force in its longitudinal direction, and the presser ik4 is held. Covered. Then, the frequency @JjKHz, output 12
In addition to the high-frequency magnetic field of KW, an aluminum film induction heating element 9 was used to generate heat. Through this operation, the nylon 1B copolymer, which is the hot melt Wi type adhesive lO, is melted and
In 0 seconds, the 5G connecting portion of the 1m optical fiber element was rapidly joined and integrated with the reinforcing device L. The following tests were conducted on the optical fiber junction &M reinforced in this manner. The results are shown in IK/Table.

■ Optical fiber I! Determination of tensile strength of I-joint ■ Measurement of transmission loss due to reinforcement ■ Measurement of change in transmission loss due to temperature fluctuations between -20°C and +60°C (hereinafter referred to as temperature characteristics) ■ Heat cycle test) (-20°C ``C ~ +60℃, 6 hours/l cycle, measurement of change in transmission loss after 100 cycles) ■ High temperature test) Measurement of change in transmission loss after 30 days of listening at cgo''C) ■ High temperature test C40℃, (Measurement of change in transmission loss after being left at 93% RH for 30 days) (Left below) [Example 2] In Example 1, the material of the reinforcing device 1, the hot melt Wi-type adhesive 0, and the material of the induction heating element 9 I changed its shape and reinforced the Hikari 7 Aipam Ribbon. The results are shown in Table 1.

[Example 8] A reinforcing device 12 for reinforcing the four optical fiber core wires shown in the figure was formed of quartz glass. Its dimensions are 60 pieces long,
The height is 3wm5 and the width is 7m. As the induction heating element 9, a 30 pwt thick nickel thin film formed by plating on the inner surfaces of the pedestal 8 and the presser foot i14 was used, and as the hot-melt adhesive 10, nylon lz fluoropolymer was used.

° Next, induction heating was performed in the same manner as in Example 1, and the light
The AIPA core wire was reinforced. The strength characteristics of this reinforced portion were measured in the same manner, and the results are shown in Table 1.

As explained above, this invention provides an optical fiber core IIMw.
When reinforcing the first connected part, a hot-melt adhesive and an induction heating element are provided inside a reinforcing device consisting of a pedestal in which a long part is formed and a presser pot that covers the long groove part, Next, the connected optical fiber core is placed in the long groove of the reinforcing device, and induction heating is performed from the external tube to achieve the above-mentioned Il! The guiding conductor is heated to melt the heat-melting adhesive, thereby integrating the optical 7 eyeglass core @ 11' connecting portion and the reinforcing device. Therefore, we used a hot-melt adhesive to bond the reinforcing device and the optical fiber, and an induction heating element was used to heat and melt the hot-melt adhesive. The work can be completed in an extremely short time, and there is no fluctuation in transmission loss of the optical fiber due to solidification of the adhesive.

Also, since we used a 7-eye diameter induction heating element, this is the hot melt I! ! Since the mold adhesive serves as a reinforcing material, the bonding strength between the reinforcing device and the optical fiber core increases, further increasing the reinforcing effect.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing an example of a reinforcing device used in the reinforcing method of the present invention, Fig. 2 is a longitudinal cross-sectional view of the reinforcing device with a film-like induction heating element adhered to the inner surface, and Fig. 3 is a Vertical to show reinforcement status! Ih@J diagram and Da diagram are also horizontal 11Trfi
Figures J, 5, and 5 are all cross-sectional views showing reinforcement conditions according to other examples of the reinforcing method of the present invention. 1...Reinforcer, 2...Long groove, 8...
...cradle, 4...presser pot, 9...
Induction heating element (thin film), 10...Hot melt adhesive. Applicant: Nippon Telegraph Corporation

Claims (1)

[Scope of Claims] 1. When reinforcing the Hikari 7 Eyebar core connection part, a hot-melt adhesive and An induction heating element is provided,
Then, connect the connected optical fiber core wire with the long groove s of the
VC, the induction heating element is heated from the outside to generate heat, and the heat-melting adhesive is melted to integrate the optical fiber core@junction II part and the reinforcing device. Reinforcement method for fiber core & gluing part 0 2 Top 1. The induction heating element is iron, cobalt, nickel, aluminum, silver, zinc, tin, lead, tungsten, molybdenum, manganese, magnesium, tantalum, carbon, ferrite. Claim 1, which is formed mainly of at least /Ik or more materials from the group of
Method for reinforcing the optical fiber core S connection portion described in . 2. The method for reinforcing an optical fiber core @connection portion according to claim 1, wherein a film-shaped induction heating element is provided on the inner surface of the auxiliary EA device. The optical fiber core W as claimed in claim 1, characterized in that a 47-eye diameter induction heating element is provided inside the reinforcing device! How to reinforce the continuation part.