JPS599614A - Terminal mechanism of optical fiber and its assembling method - Google Patents

Abstract

PURPOSE:To use an optical fiber terminal mechanism immediately after assembling by attaching a tip part of an optical fiber to an attaching member, and arranging the attaching member in a supporting member and fixing it temporarily. CONSTITUTION:The optical fiber connecting device consists of an adapter 21, optical fiber terminal mechanism 22, and cap nut 23. The terminal mechanism 22 is equipped with a cylindrical supporting member, e.g. a housing 24, the attaching member for the optical fiber, e.g. an optical fiber plug 25, and a cap nut 26 for calking. A temporary fixing through hole 28 for fixing the plug 25 to the housing 25 temporarily, adhesive injecting hole 31 for primary fixation, and an air vent through hole 32 are formed in the wall part of the housing 24. The plug 25 is inserted into the housing 24 and instantaneous adhesives 53 are charged in the temporary fixing through hole 28 to fix the plug 25 to the housing 24 immediately; and the adhesive injecting through hole 31 and air vent through hole 32 are sealed with tapes, etc. Thus, the optical fiber connecting device is used immediately right after assembled.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a source fiber terminal 4!4m for optically connecting optical fibers to each other or source fibers to other equipment, and a method for assembling the same.

Conventionally, there has been a device for connecting source fibers to each other with a structure similar to that shown in FIG. 1. In this Figure 1, the original fiber concatenating device is an adapter (18 ferrule (28 ferrule)
3) and a bag nut (4). In the axial center of the tip of the cylindrical ferrule (2), there is an original fiber guide hole (5) for guiding the original fiber (3).
) is provided. The optical fiber +31 has one end surface (6
) is inserted into the guide hole (5) until it is flush with one end surface (7) of the ferrule (2), and is fixed in this state with an adhesive (8) such as epoxy resin. With the original fiber +31 fixed in the guide hole (5), a pair of ferrules (2) are slid into the cylindrical adapter (1) from the end face (7J side), and the end face (7) In addition, a cap nut (4) is screwed and fixed to the adapter (11), and the ferrule (2) is positioned by the cap nut (4) to prevent it from falling off the adapter (II). ing.

In the above configuration, one end surface (
Oj are brought into contact with each other, and the original fibers + (optically) are connected to each other.

However, when assembling the upper hr dual fiber connection device,
In order for the original fiber tX (J) to be fixed in the ferrule (2), the adhesive (δ) must be cured, but the adhesive (8) such as epoxy resin takes several hours N] or more to harden. In addition, the original fiber (otherwise, it is not fixed in the ferrule (2) for a short time).
In order to bring them into opposing contact with each other, it is necessary to remove the adhesive (81) protruding from the end surface (7) by polishing the end surface (7) after the adhesive (8) has hardened. Therefore, the original fiber connecting device as shown in Figure 1 cannot be used immediately after assembly.Furthermore, the ferrule (2)
By inserting the fibers into the common adapter rIt, one end surface of the original fiber (, 3j (61) is facing each other, so that the guide hole [fi+] is exactly aligned with the axis of the ferrule (2). , but the fine part of the ferrule (2) has a diameter of 10 mm with an eccentricity within a few μm.
The IJ process for making holes after 0 μm can be carried out using sophisticated machining equipment and a high-position oven, and the result is an optical fiber connection equipment that is highly enjoyable.

The present invention has been developed in order to solve the above-mentioned problems. It can be used immediately after assembly, requires only radial positioning or flattening of the original fiber, and is easy to assemble. The purpose is to provide a J@ original fiber terminal structure.

An embodiment of the present invention will be described below with reference to FIGS. 2 and 3.

FIG. 2 shows an embodiment of the present invention applied to an optical fiber connecting device for optically connecting original fibers to each other. Note that FIG. 2 shows only the right half of the optical fiber connection device, and in reality there is also a left half that is symmetrical to this. In this Figure 2, the optical fiber connection device is an adapter urn.
s After the optical fiber terminal - Consists of a ring and a cap nut (c).

The terminal mechanism (22I is equipped with a cylindrical support member such as housings U and V, a member for attaching an optical fiber such as an optical fiber norag Q5), and a cap nut for tightening (!1i).

The housing C71) is made of gold PA etc.
Part 1;! :11 has a tapered shape so as to be fluid-tightly crimped by the optical fiber cord (2'0 is inserted into the bag), and the inner surface of the other side end part 1,301 A step c14 is formed so that the plug (2:ij) can be installed liquid-tightly.In addition, the plug (14!+J is temporarily fixed to the housing (J, ++) on the wall of the housing brake a. The temporary fixing through hole Czw1 is a means for fixing the plug (c) and the original fiber (481) 1r). An injection hole 01) and an air vent hole 321 are formed.

The plug (25) includes a ferrule C having a substantially cylindrical shape,
'a1 External / Parallel light conversion lens, for example, a rotary T-rate distribution type lens C (4), an original fiber support R, 3, and its tip when inserted through this support (, 35). It consists of deposited optical fibers (48). The ferrule ■ has a flange group 6 that comes into contact with the stepped part of the housing (2) so that it can be attached to the liquid reservoir on the housing (2).
It is made of metal such as stainless steel, synthetic resin, ceramics, etc. The refractive index gradient lens is made of glass, synthetic resin, etc., and its length is approximately an odd multiple of 1/4 pitch of the meandering period of light, and the flange part ('
, +lJ, a cover glass is attached as necessary to the end face on the opposite side. The space between the supports is made of glass, synthetic resin, metal, ceramic, or the like and has substantially the same properties, and the outer diameter thereof is somewhat smaller than the inner diameter facing the ferrule.

In addition, the original fiber (4al
A through hole 0!11 is formed for inserting the optical fiber (181), and the outer layer of this through hole has a tapered opening f401 for inserting the optical fiber (181). The original fiber (48) is inserted and fixed until it comes into contact with the lens C (Company).

The procedure for assembling the plaque (25) having the above structure will be explained with reference to FIG. First, the lens 341 is adhesively fixed inside the ferrule (...), and the support CJ51 is simply inserted into the ferrule without adhesive. When fixed to the front support device 07J, the source fiber C+a+ for photofluorescence measurement is inserted into the insertion hole O of the support 05), and the tip of this optical fiber is attached to the lens Connect in advance another source fiber plug (41) to the other end of the source fiber branch.This other plug (4υ also has substantially the same configuration as the one shown in Figure 2 and has already been assembled). The light output from the original fiber is converted into parallel light using the power plug 01), and this parallel light is originally received at 1,000 O4 and the received light is monitored by a light weight monitor. (Measure with 4, 1. In the upper dpi measurement system, while measuring the parallel light beam (4 yen) from the light lens 06 at the zero angle of the lens in the plug (c),
Plug c! 5) Move the support c3:0 in a direction different from the optical axis by 1 to find the position where the received f amount peaks, that is, the optical axis of the lens c(4) and the central axis of the support C3:j Find matching positions. At this position, fix the support G gloss to the ferrule (33+ with adhesive (41υ), and pull out the original fiber C38J from the support (3!j. Fixed support 6: Horn insertion hole C> +1 outside the optical fiber to be inserted into 91 (48j is an optical fiber code reflex)
1! It is obtained by removing a predetermined length of the slow release member (461) and the inner coating (4:j). Plague 5)
(Insert into the insertion hole 01 of the illusion j,
Aperture (adhesive +:;U, close to 4Ql) makes the wing rigid.

Next, we will explain the procedure for assembling the terminal device a (2).The plug (251) inserted and fixed at the tip of the original fiber decoy, and the flange part OJ of the ferrule is connected to the stepped part (54) on the inner surface of the housing e. Push into the housing h from the right side in Figure 2 until it hits the flange part 6.
Since the step part 0"4 is supported, the plugs (2~ and 11"1 with the plugs (24j and 24j) are liquid-tight.
1 and the optical fiber cord η, fill the temporary fixing through hole 081 with an instant adhesive 5J such as cyanoacrylate, and temporarily fix the plug 5) to the nozzle (24+).

And Fukuro Natsutto (2: (+ from Ukai in Figure 2/
Slide fit into the outer tank of %Using CA1+. Next, by screwing the bag neck 1- (!liJ) into the nozzing h, tighten the tenor dimension formed on the nozzle at one end of the nozzle (241), and attach the original fiber cord reflex. Liquid-tightly fix the plug (25+ and the original fiber cord 0) to the nozzle C2=11. Then, in order to permanently fix the plug (25+ and the original fiber cord 0) to the nozzle C2=11, apply epoxy through the adhesive injection hole 01. Adhesives such as resin (!j4.+
is injected through the air vent hole 021 until the adhesive is fully absorbed. In the case of the optical fiber ((18), the exposed part from the fiber cord θ of the 4th block is traced less than the length of the support C'f5J, so the original fiber ((18) If the agent c>r, + and the long λ law, the contact force will be larger than the case where the buffer member (40 or the inner target (4'0) is in contact with the agent C>v). When the injection of the shield agent (4) is completed, the hole for the injection of the shield agent (31J and the through hole for air vent 0)
Seal 2I with tape. In the above assembly procedure, after temporarily fixing the plug (c) to the housing Q1), when screwing the cap nut (IG) into the housing (24j), connect the original fiber cord e0 to 71 uzink 01). After moistening and fixing it liquid-tightly, I applied adhesive (5r) for the final fixing, but the process of temporarily fixing the plug (2ω) was to attach the original fiber cord (77) to the liquid pipe against 41 of the housing. It may be performed after the fixing step or after the step of injecting the adhesive 6υ for main fixing.

Insert the shield (2□・+) configured as above into the plug (z51 into the housing 1) and insert the through hole for temporary fixation (1, 1 ~ into the l1i41 connector). υ (The misalignment of filling the poem) was immediately temporarily fixed against the rough (25j?)-Using (241J), and at that time, the plug (c) and the original fiber cord ('lH were respectively) were inserted into the zinc & 4jJ. Since I have become a director, and I have come into contact with history, Shun Eiri of Mll Rika told me that IJ and air vent hole 04 can be sealed with tape, etc. Even 6 skin agents injected into the housing υψ can be removed by one modification.
/It will not leak outside. Also, since the shield angle 1 insert for defining the plaque (2:+J) does not shield the end face of the lens Uψ, there is no need to re-polish the end face of the lens cla.Therefore, the terminal machine # (24 Even immediately after assembling, if you fit the plug &5) into the adapter (21) and screw the cap nut 03) into the adapter (11),
It can be used immediately as an optical fiber connection device.

Further, since the support body 05) is fixed at the original axis position of the lens Oa by the above-described procedure, the accuracy of the center position of the insertion hole in the support body C(5) does not matter. Therefore, the terminal machine* (2
:a has no parts that require high-precision machining, and has a low
Can be made at a low price.

Furthermore, in the source fiber connecting device shown in FIG. 1, since the one end surfaces (6) of the source fibers (3) are brought into opposing contact with each other, there is a possibility that chips may be present in the source fibers (3). There is a risk of connection ps caused by this, and since the core diameter of the original fiber (31) is generally about 50 tones, dust from the copying tray may adhere to one end 11i [T (6). A connection ps occurs, and therefore such an original fiber interconnection device inevitably has low stability.

However, in the terminal mechanism V4 used in the optical fiber connection device shown in Figure 2, the light emitted radially from one end surface of the original fiber (the light emitted radially from one end face of the four wires is parallelized by the lens C34) until it becomes parallel light. The parallel light incident on the end surface of the lens Oa is converged on one end surface of the optical fiber (48). Therefore, even when optically connecting the original fibers, there is no need to mechanically bring the pair of terminal mechanisms (221 lenses) into opposing contact with each other in the adapter t2JI.
It is possible to prevent damage to the lens ■, and even if dust sticks to a part of the end surface of the lens ■, the connection loss rate is small, and for this reason, the reliability of the terminal 'r)It @C2:4 is extremely high. Good.

Although the present invention has been described above with reference to an embodiment, the present invention is not limited to this embodiment, and further six buildings can be replaced.

For example, in the optical fiber plug eω, instead of the gradient index lens (2), a spherical lens having light-receiving, parallel f, and variable m functions may be used, and the material of this spherical lens may also be glass. , instead of instantaneously filling the layer agent into the hole (c) for temporary fixing, which is a synthetic resin material, the provisional I! i
Temporarily fix the original fiber plug (25) to the nozzle C41 by forming a female thread on the inner surface of the l1 foot hole (c) and inserting a male thread without a thread into this female thread. You may do so. Furthermore, the flange portion 6υ and the step portion (521) that are in contact with the original fiber plug C and the inner surface of the housing V (a) to make the inner surface liquid-tight may be configured in a tapered shape so that they fit into each other.

In the present invention, as described above, the distal end of the original fiber is attached to the member, and the member is placed in the support member, and the member is temporarily attached to the support member by the temporary fixing means. I fixed it. Therefore, the original fiber terminal mechanism according to the present invention has the excellent effect that it can be used immediately after assembly.Furthermore, the end of the original fiber is attached to the end of the original fiber. Therefore, compared to attaching the tip of the optical fiber directly to a cylindrical support member, it is easier to align the original fiber in the radial direction. Since there is no need to temporarily fix the tip of the original fiber by electrical connection, the assembly can be made easily since the member can be temporarily fixed during the inspection.

[Brief explanation of drawings]

Fig. 1 is a schematic sectional view of a conventional example of an original fiber splicing device, Fig. 2 is a schematic sectional view of an embodiment of an original fiber splicing device to which the present invention is applied, and Fig. 6 is a schematic sectional view of an example of an original fiber splicing device. FIG. 3 is a schematic diagram illustrating a part of the assembly procedure of the original fiber terminal mechanism shown in FIG. In addition, in the symbols used in the drawings, (24)...
・・・・・・・・・・・・, Knowing (ha)...
・・・・・・・・・・・・Optical fiber plug (!8;・
・・・・・・・・・・・・Through hole for temporary fixing (48)・
・・・・・・・・・・・・・・・ Original fiber 6, v...
・・・・・・・・・・・・Glue punishment. Agent Masaru Ueya # Yoshio Toba Toshio Sugiura

Claims (1)

[Claims] 1. The mounting to which the tip of the optical fiber is attached is a member;
a cylindrical support member in which an intermediate portion inside the tip of the optical fiber is attached to one hooked end, and the mounting member is attached to the other end; Temporary fixing means for temporarily fixing the member to the support member; and a temporary fixing means for temporarily fixing the member to the support member; and an adhesive, respectively, and the attachment is configured such that the mounting pin can be inserted into the support member from the two ends of the support member to the other end of the support member. 2. To install the tip of the optical fiber, insert the member from one end of the rib-like support member to the other end, and then attach the member to the third end. a step of temporarily fixing the member to the supporting member through a temporary fixing through hole formed in the supporting member; and a step of temporarily fixing the member to the supporting member through a temporary fixing through hole formed in the supporting member; - the step of crimping the two ends to make the space between them liquid-tight, and injecting adhesive into the hollow 815 of this support 815# from the adhesive injection hole formed in the support member. and a step of permanently fixing the attaching member and the optical fiber, respectively.