JPS5994702A - Optical attenuator - Google Patents

Abstract

PURPOSE:To suppress variation in the amount of attenuation during attachment and detachment and to prevent damage to an attenuation film by forming an optical fiber and an end surface of a cylindrical member for holding the optical fiber fixedly both slantingly to an optical fiber and then coating. CONSTITUTION:The cylindrical member 12 for holding the optical fiber fixedly and the optical fiber 13 on its center axis have one end surface formed slantingly to the center axis, and their slanting surfaces are coated with the attenuation film by vapor-depositing titanium. Therefore, the attenuation film contacts neither with the end surface of the optical fiber 13 nor the end surface of the optical fiber in a ferrule 6 facing it; even when ferrules 5 and 6 or the cylindrical member 12 rotates, the distance between the end surfaces is inveriably constant and the amount of variation during connector insertion does not vary. Further, the optical fibers do not rub against each other on their end surfaces, so the attenuation film has no rub. Thus, the variation in the amount of attenuation and damage to the attenuation film are prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an attenuator structure used for measuring optical communication systems or setting an appropriate level. If it exceeds the original attenuator, the original attenuator is unnecessary as a pseudo line. 8+! As shown in Figure 1 (a) VC, 7 errules 5.6'?r of the original connector grug having 5' and 6''e on the original fiber on the central axis: facing each other, and between them the lens 2 for adjusting the original axis, 3 or a light attenuation element 4 is inserted. However, with this structure, the lens 2.3 is inserted.
It is not easy to adjust, and the production cost is high because the original material of the lens and reduction element is the cylinder price.

As another source attenuator, as shown in FIG. 1(b), a source fiber 9. is placed between the ferrules 5.6 on the central axis. There is a structure in which cylindrical sections 7 and 8 each having a total of 1000 mol of oxide are arranged, a damping film is applied to the inclined surface provided with the end surface Vc, and the inclined end surfaces are abutted against each other. In this case, since a lens is used, the adjustment of the original axis is easier than with the original attenuator shown in FIG. 1(a). However, in the former connector layer theory, 7 errules 5.6
rotates to some extent, so the inclined end face is not completely bent, the gap between fibers 9 and 10 changes every time the optical connector is connected and removed, and the C reduction foot fluctuates, and the original fibers yifA and lfI on the inclined end face are butted against each other. There is a disadvantage that the damping film may be damaged due to Rust on original fiber for connection between violet fc inclined ends and connection between ferrule and cylindrical member. The surface treatment is 1j ◎ Therefore, the objective of the invention
An object of the present invention is to provide a low-cost power reducer that can suppress fluctuations in the power decreaser and prevent damage to the damping film caused by the 7-way rivet butt Vc. 7 of 2
In the original fixing reducer in which the errule and the original reducing part provided between the seven errules are aligned in the sleeve, the optical fiber that couples the input/output optical fiber and the "self-fiber" are held and fixed. A cylindrical member, 1. a 7-eye bar, an inclined surface formed obliquely with respect to the end surface of the cylindrical member, and a damping film coated on the inclined surface are obtained. .

According to the present invention, the reduction layer can be added to a predetermined reduction amount by fully controlling the thickness of the damping film to be coated. In addition, since only the end face of the original fiber fully coated with the attenuation film is formed obliquely with respect to the central axis, most of the reflected light can be completely leaked. Since the ferrule does not come into contact with the side optical fiber end face and always remains at a constant distance, damage to the attenuation film can be prevented, and fluctuations in the damping amount can be suppressed even when the ferrule is rotated due to attachment and detachment.

For the embodiments of the following VcX invention, please refer to the drawings in detail.
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FIG. 2 is a sectional view of a complete embodiment of the present invention.

In the figure, a cylindrical member 12 with an original fiber 13 inserted on the central axis is inserted into the center of the sleeve 1, and on both end faces of the cylindrical member 12 there are original connector plugs each having all original fibers 5' and 6' on the central axis. Cylindrical reinforcing member (ferrule) 5
．． 6'lr butt and strain.

The original fiber 13 on the central axis of the cylindrical member 12
The end face of -10,000 is formed obliquely with respect to the central axis, and a damping film made of vapor-deposited titanium is applied to the inclined end face.
The end faces of the errules 5 and 6 are formed.The other end face of the cylindrical member is formed perpendicular to the central axis. Therefore, the attenuation film is the coded original fiber 13.
The end face of the ferrule 6 and the end face of the original fiber of the ferrule 6 facing it do not contact each other, and even if the ferrule 5.6 or the cylindrical member 12 rotates once, the distance between the end faces is always one foot, and when the connector is inserted, the distance between the end faces is always one foot. There is no change in the amount of skill reduction in 0
Furthermore, since the optical fibers do not rub against each other between the end faces, there is no damage to the attenuation film. In addition, the parts between the ferrules are a cylindrical member coated with a Vc membrane at one end and one source fiber, making it easy to align the two ends (adjustment), resulting in smaller size and lower costs. can.

In the above embodiment, only one end face of the original fiber with the cylindrical member and its central axis Ic was provided with an inclined surface and coated with the damping film. good.

[Brief explanation of the drawing]

1(a) and 1(b) are cross-sectional views showing an example of a conventional constrictor, and FIG. 2 is a cross-sectional view of an embodiment of the present invention. IJ-fu, 2. * 3...uns, 4...decreased WE child, 5, 6...
7 erule 2 le, 5's6'... Former 7 aino <, r. in ferrule. s. xz...Cylindrical member, 1
1.14...Attenuation film, 9, 10, 13
...Original fiber O! To +-,

Claims (1)

[Claims] Two ferrules that hold and fix the input/output optical fiber on the base axis and have an end face 't- perpendicular to the base axis, and the light attenuation section provided between the seven ferrules and the light that is illuminated within the entire sleeve. In the fixed attenuator, the source fiber is connected to the source fiber, the cylindrical member that holds and fixes the source fiber, and the end surfaces of the source fiber and the cylindrical member are formed obliquely with respect to the source axis. An original attenuator comprising a surface and a damping film coated on the inclined surface.