JPH06214120A - Optical connector type nonreflective terminal device - Google Patents

Abstract

PURPOSE:To provide an inexpensive optical connector type nonreflective terminal device capable of performing a nonreflectlve processing in a short time. CONSTITUTION:The front part of an optical fiber 2 having a prescribed length is inserted in the small diameter hole of a ferrule 1 for an optical connector a housing attaches to, and the leading end face of the fiber 2 is ground so that it may be at the same level of the end face of the ferrule 1, and the terminal face of the back part of the optical fiber 2 is positioned in the large diameter hole 5 of the ferrule 1 and buried in optical adhesive 6. Since the terminal face 4 of the optical fiber is positioned in the large diameter hole 5 of the ferrule and the optical adhesive 6 is injected in the large diameter hole 5 so as to make the face 4 a nonreflective end, the nonreflective processing for the terminal face of the optical fiber is performed in a short time, and the inexpensive device is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low cost optical connector type non-reflective terminator.

[0002]

2. Description of the Related Art For example, an idle optical fiber which has not been used after being wired has a non-reflective terminator attached to its terminal because it reflects the propagating light at its terminating surface and adversely affects the oscillation source of the light. Therefore, the reflection of the propagating light is prevented. An optical connector is attached to the optical fiber in the non-reflective terminator, the end face of the optical fiber is obliquely polished, and the reflected light at the end face is deflected outward so that the reflected light travels back into the optical fiber. Those that were not used were being used.

[0003]

However, the above-described non-reflective terminator is disadvantageous in cost because it takes a long time to obliquely polish the optical fiber termination surface.

[0004]

SUMMARY OF THE INVENTION The present invention has been made as a result of intensive studies in view of such a situation. The object of the present invention is to manufacture an optical connector type non-reflective, low cost. To provide a terminator. That is, according to the present invention, the front portion of an optical fiber having a predetermined length is inserted into the small-diameter hole of the ferrule of the optical connector in which the housing is mounted on the ferrule, and the end face thereof is ground to the same face as the ferrule end face. Further, the end surface of the rear portion of the optical fiber is located in the large diameter hole of the ferrule and is embedded in the optical adhesive.

In the optical connector type non-reflective terminator of the present invention, the end surface of the optical fiber is embedded in the optical adhesive, the propagating light is emitted from the end surface of the optical fiber into the optical adhesive, and the emitted light is emitted. Is made non-reflective by being scattered in the optical adhesive. The optical fiber is made non-reflective in the ferrule, a housing is attached to the ferrule to form an optical connector, and a terminal such as an idle optical fiber is connected to the optical connector. An optical adhesive having a refractive index equal to that of the core of the optical fiber is used as the optical adhesive for burying the end surface of the optical fiber. When the terminal surface of the optical fiber is located near the small diameter hole in the large diameter hole in the ferrule,
It is preferable that the propagating light is sufficiently scattered or the amount of the optical adhesive is small. The end surface of the optical fiber may be in a shape as it is cut with a nipper, etc.
It is preferable because the return of reflected light can be prevented more reliably. The optical connector type total reflection end of the present invention includes SI, GI, SM, DS
An optical connector such as an F type or the like, or an SC type or FC type optical connector can be applied to the optical connector including the ferrule and the housing.

[0006]

In the optical connector type non-reflective terminator of the present invention, an optical fiber having a predetermined length is arranged in the ferrule of an optical connector in which a housing is attached to a ferrule, and the end surface of the optical fiber is immersed in an optical adhesive. Since it is embedded and propagated light is scattered in the optical adhesive from the end surface of the optical fiber to make it non-reflecting, the anti-reflecting is a simple operation of injecting the optical adhesive into the ferrule and solidifying it for a short time. It will be achieved at home. Further, since the optical connector type non-reflective terminator of the present invention can utilize the existing optical connector, it can be easily connected to an idle optical fiber or the like and is inexpensive.

[0007]

EXAMPLES The present invention will be described in detail below with reference to examples. Embodiment 1 FIG. 1 is a vertical sectional view showing a first embodiment of an optical connector type non-reflection termination device of the present invention. An optical fiber 2 having a predetermined length is inserted into the small-diameter hole of the ferrule 1, the end face of the ferrule 1 and the end face 3 of the optical fiber are ground to be the same face, and the end face 4 of the optical fiber is Is located in the large diameter hole 5 of the ferrule and is embedded in the optical adhesive 6.

An SC type housing component group 12 is mounted on the outer periphery of the ferrule 1. That is, the SC spring 7 is loosely inserted around the outer periphery of the ferrule 1, the SC stop ring 8 is attached from the rear, the SC spring 7 is pressed against the convex portion 9 of the ferrule, and the SC plug frame 10 is assembled from the front. After that, the SC knob 11 is attached from the rear side and assembled. The optical connector type total reflection end is used by optically connecting the end face thereof to the end portion of the counterpart optical fiber to which an optical connector (not shown) is attached.

As shown in FIG. 2, the ferrule obtained by making the above optical fiber non-reflective is such that the optical fiber 2 of a predetermined length is inserted into the small-diameter hole of the ferrule 1 and one end thereof is projected from the front surface of the ferrule 1. The optical fiber 2 is inserted and fixed to the front surface of the ferrule 1 with an adhesive agent 14, the end surface 4 of the optical fiber is positioned in the large diameter hole 5 of the ferrule 1, and the optical adhesive agent 6 is injected around the hole. It is manufactured by solidifying, embedding the end surface 4 of the optical fiber in the optical adhesive 6, and then vertically polishing the end surface of the ferrule 1 on the side of the small diameter hole.

Embodiment 2 FIG. 3 is a vertical sectional view showing a second embodiment of the optical connector type total reflection end of the present invention. This optical connector type total reflection end is one in which an FC type housing component group 13 is attached to the outer periphery of the same ferrule 1 as that manufactured in Example 1. Example 1
30 optical connector type non-reflective terminators were manufactured and the optical attenuation of each was measured, and the average attenuation was 51 dB and the minimum attenuation was 43 dB.
A good anti-reflection effect was obtained in dB.

[0011]

As described above, the optical connector type non-reflective terminator of the present invention has a low cost because the non-reflective treatment of the optical fiber termination surface is performed within a short time, and has a remarkable industrial effect.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a first embodiment of an optical connector type non-reflective terminator of the present invention.

FIG. 2 is a vertical cross-sectional view showing an embodiment of a method for producing a ferrule in which an optical fiber used in the present invention is made non-reflective.

FIG. 3 is a longitudinal sectional view showing a second embodiment of the optical connector type non-reflection terminating device of the present invention.

[Explanation of symbols] 1 ferrule 2 optical fiber 3 tip surface of optical fiber 4 end surface of optical fiber 5 large diameter hole of ferrule 6 optical adhesive 7 SC spring 8 SC stop ring 9 convex part of ferrule 10 SC plug frame 11 SC Knob 12 SC connector 13 FC connector 14 Adhesive

Claims (1)

[Claims] 1. A front part of an optical fiber having a predetermined length is inserted into a small-diameter hole of the ferrule of an optical connector having a housing attached to a ferrule, and a front end surface of the front end is polished to be flush with an end surface of the ferrule. An optical connector type non-reflective terminator characterized in that the terminal surface of the rear portion of the optical fiber is located in the large diameter hole of the ferrule and is embedded in an optical adhesive.