JPS5814641B2 - Hikarifuaibadensousenrokankirikaesouchi - Google Patents

Description

[Detailed Description of the Invention] In future optical fiber communications, an optical communication system using multi-core optical fiber cables is conceivable.In this case, after installation, switching between each optical fiber transmission line will be performed in the optical domain. There will be demands to do so.

Possible switching methods in the optical domain between spatially multiplexed optical fiber transmission lines include (1) a multichannel optical integrated circuit method with active functions, and (2) a mechanical direct switching method.

The present invention relates to an optical fiber transmission line switching device for realizing the method (2) above.

Examples will be described below using figures.

FIGS. 1 and 2 are structural explanatory diagrams of the main parts of the present invention.

A V-shaped groove d is formed along the generatrix on the circumferential surface of a cylindrical body a having an arbitrary diameter so that its tip coincides with one concentric cylinder b of the cylindrical body a.

FIG. 1 is a circular sectional view of the cylindrical body, and FIG. 2 is a generatrix sectional view of the cylindrical body.

In this figure, four V-shaped grooves are shown.

Along the V-shaped groove d, optical fibers C 1 , C2 , Cs , and C4, which are longer than the length of the cylindrical body, are sufficiently pressed against the V-shaped groove and fixed using an adhesive or the like e.

In this case, the adhesive e etc. should be prevented from coming out from the side surface of the cylindrical body a.

As described above, the cylindrical body with the optical fiber fixed in the V-shaped groove along the generatrix is cut in the radial direction near the longitudinal center f, thereby dividing the cylindrical body into two in the longitudinal direction.

In FIG. 3, the optical fibers are C1, C'1, C2
, C'2, C3, C'l, C4, C'4.

In FIG. 1, the four V-shaped grooves d are positioned at intervals of 90° with respect to the center of the cylindrical body.

Cylindrical bodies a1 and a2 with optical fibers divided into two in the longitudinal direction
are inserted into the inside of one cylindrical tube g with their cut surfaces facing each other.

FIG. 4 shows that optical fibers C1 and C'1 are formed by rotating the two cylindrical bodies a1 and a2 inserted into the cylindrical tube g.
, C2, C'2, C3, C'3, C4, and C'4.

The state at the time of cutting is O degree, and when the cylindrical body a1 is fixed and the cylindrical body a2 is rotated clockwise, C1 →
C'4, C2 → C', C3 → C'2, C4 → C'3 switching is executed (symbol → indicates the optical fiber between connections) Similarly, the optical fiber is rotated by 180 degrees and 270 degrees. Switching between is executed.

It returns to its original state in 360 degrees.

In the present invention, there is no limit to the number of optical fiber lines, and if the difference in the outer diameter of the optical fibers housed in each V-shaped groove is minimized, the optical loss due to switching can be sufficiently reduced. One way is to use the same optical fiber.

In the present invention, if a light source or a photodetector is installed at the tip of, for example, C4tσ4 among the optical fibers c, c'1, . . . , the center of the optical fiber transmission line can be It will be possible to conduct exams, final exams, and regular exams.

Further, an example of a method of arranging the optical fiber C on the cylindrical body a is shown in FIGS.

Since the present invention is constructed as described above, the switching portions of the fibers that come into contact with each other are formed by cutting fibers of the same object, and the connection loss caused by switching the transmission line is small.

Furthermore, by appropriately selecting the outer diameter of the optical fiber and the radius of the cylindrical body, it is possible to have an arbitrary number of optical fibers.
There is no particular restriction on the number of optical fiber transmission lines to be switched.

Further, grooves d having a V-shaped cross section are formed at equal intervals on the outer circumferential surfaces of the first and second cylindrical bodies rotatably supported within the cylindrical tube, and optical fibers are fixed in the V-shaped grooves d with adhesive e or the like. By doing this, the alignment of the optical fiber between the first and second cylindrical bodies becomes accurate, and since the switching connection between the optical fibers of the first and second cylindrical bodies is performed by rotation, switching is possible. It has the advantage of being easy to operate.

Furthermore, a V
After forming a V-shaped groove and fixing an optical fiber in the V-shaped groove,
The first and second cylindrical bodies can be formed by cutting at the center, which has the advantage of being easy to manufacture.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the front structure of the main part of the present invention, Fig. 2 is a side view with the same part cut away, Fig. 3 is an exploded explanatory diagram of the switching device, and Fig. 4 is an explanatory diagram of the fiber switching device. Schematic drawings for explanation, FIGS. 5A, 5B, and 5C show front views showing an example of the arrangement of optical fibers in a cylindrical body. a j a, j a2゜゜゜・゜゜Cylinder, C1~C
4... Optical fiber fiber, d... V-shaped groove,
e...Adhesive, g...Cylindrical tube.

Claims (1)

[Claims] 1 Form V-shaped grooves in cross section along the axial direction at equal intervals on the outer peripheral surfaces of the first and second cylindrical bodies, and fix an optical fiber in the V-shaped groove so that the tips of the optical fibers face each other. said first
and inserting a second cylindrical body into a cylindrical tube, rotatably supporting either or both of the first or second cylindrical body within the cylindrical tube, and fixing the second cylindrical body to the first and second cylindrical bodies. 1. A switching device between optical fiber transmission lines, characterized in that the switching device is configured to switch and connect optical fibers.