JPS61123804A - Optical multiplexer and demultiplexer - Google Patents

Abstract

PURPOSE:To easily manufacture an optical multiplexer and demultiplexer which is easily connected to a connector by working end surfaces of rods through which optical fibers are run in the center and constituting an optical multiplexing and demultiplexing part, and fitting a cylinder body for connector connections fixedly around the projection of the optical multiplexing and demultiplexing part. CONSTITUTION:Both tip sides of the rods 6a and 6c through which optical fibers 1(1a-1c) are run in the center are cut at 45 deg. symmetrically; and a rod 6b is cut at 45 deg. in one direction and a wavelength selective transmission film 4 is stuck on the end surface. Those end surfaces are combined together without any gap to constitute the optical multiplexing and demultiplexing part 5. Their periphery is fixed with transparent resin 7, a cylinder body 8 is fitted around the projection part, and the part 5 is easily connected to an optical fiber connec tor 12 with a male screw 10. Therefore, the work of the end surfaces and the constitution of the optical multiplexing and demultiplexing part are carried out while the optical fiber 1 is run fixedly through the rods 6(6a-6c), and the manufacture is facilitated. Further, this is easily connected to the lead optical fiber with a cylinder body for connection.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an optical multiplexer/demultiplexer for multiplexing or demultiplexing light, and particularly to an optical multiplexer/demultiplexer using an optical fiber.

[Prior art and its problems]

The basic structure of an optical multiplexer/demultiplexer using optical fibers is shown in Figure 7. Reference numeral 1a is the first optical fiber, 1b is the second optical fiber, and lc is the third optical fiber. It is composed of cladding 3.

The first and third optical fibers 1a/IC have end faces cut symmetrically at an angle of 45'' on both sides of the diameter line, and the second optical fiber 1b has end faces that are cut symmetrically at an angle of 45''. The second optical fiber lb has an end face cut in the direction.A wavelength selective transmission film 4 is attached to the end face of the second optical fiber lb.A light combining/demultiplexing unit 5 is constructed by joining these end faces without any gaps. Ru.

Now, if we put the lights with wavelengths λ and λ2 into the first optical fiber la (solid line arrow), the light with wavelength λ1 will undergo wavelength selective transmission 111.
4 and enters the third optical fiber, and the light with the wavelength λ passes through the wavelength selective transmission 1l14 and enters the second optical fiber 1b.
to go into. In other words, light is split. On the contrary, when light with wavelength λ1 is input into the third optical fiber lc and light with wavelength λ2 is input into the second optical fiber lb (dotted arrow), the light with wavelength λ is reflected by the wavelength selective transmission 11114. and enters the first optical fiber la, and the light with wavelength λg is also wavelength-selectively transmitted I
T! 14 and enters the first optical fiber 1a. In other words, an optical multiplexer/demultiplexer functions like a unit of 0 or more where light is multiplexed.

However, this type of optical multiplexer/demultiplexer is extremely difficult to manufacture because it uses thin optical fibers, and there is also the problem of how to connect it to the lead optical fiber.

[Means for solving problems and their effects]

The present invention was made to solve the problems of the prior art as described above, and the optical multiplexer/demultiplexer has a fixed rod through which the optical fibers are inserted and fixed. They are combined to form a wave section, and in this state, the periphery of the optical multiplexing/splitting section is solidified with a polymer block, and a cylindrical body for inserting an optical fiber connector is attached to the outer end of the loft protruding from the polymer block. It is characterized by being fitted and fixed.

In this way, the optical fiber has a large diameter loft, and the end face can be processed and assembled, making it easy to manufacture.Also, since the cylindrical body is fixed to the outer end of the opening 7, it can be used as a lead optical fiber. It will also be easier to connect.

〔Example〕

FIG. 1 shows an optical multiplexer/demultiplexer according to an embodiment of the present invention.
The reference numeral 1axlc designates first to third optical fibers, and these optical fibers are pushed through the centers of the first to third rods 3 to 6C, respectively, and are integrated with the rod by adhesion or the like. The optical fiber 1a~IC is connected like this to Londro 3~
End face processing is performed in a state where it is integrated with 6c. That is, the first and third rods 6a and 6c have end faces that are canted symmetrically at an angle of 45° on both sides of the diameter line, and the second rod 6b has end faces that are canted in one direction at an angle of 45''. The wavelength selective transmission film 4 is attached to the end face of the second loft 6b.

By combining these end faces without any gaps, optical coupling and
A demultiplexer 5 is configured.

The periphery of this optical multiplexing/demultiplexing section 5 is solidified with a transparent resin block 7, and the combined state of the lenses 3 to 6c is maintained. Also, the through rods 6a to 6 protrude from the transparent resin block 7.
A cylindrical body 8 is fitted to each outer end of the transparent resin block 7, and an external resin block 9 is formed outside the transparent resin block 7 so as to embed the base of the cylindrical body 8. Thereby, the cylindrical body 8 is integrated with the rods 6a to 6c, respectively. A hollow male screw IO for attaching an optical fiber connector is fixed to the outer periphery of the cylindrical body 8 protruding from the external resin block 9.

To connect the optical fiber for lead F to this optical multiplexer/demultiplexer, attach a known optical fiber connector 2 to the end of the optical fiber 11 for lead, and insert the ferrule part 13 into the cylinder 8. At the same time, tighten the cap nut 14 with the hollow male screw 1.
In this way, the connection of the optical fiber for lead is very simple.

Next, a method of manufacturing the above optical multiplexer/demultiplexer will be explained.

First, as shown in FIGS. 2 and 3, the first to third lofts 6a to 6c are placed in the positioning jig 15. An optical fiber is inserted and fixed in the center of each of the lofts 6a to 6c, and one end surface is processed like the front 1E. Rod 6a
~6c are V grooves 16a~1 formed in the positioning jig I5
6c, and the end faces are assembled without any gaps.

Next, thermosetting or UV curable transparent resin is poured into the recess 17 formed in the center of the positioning jig 15 and hardened. Examples of transparent resins include Sumitomo Bakelite E.
CR-7200/ECH-7200, Nitto Denko's NT
-8 (100, etc.) can be used. After curing, when removed from the positioning jig 15, as shown in FIG.
~6G are integrally joined by the transparent resin block 7.

Next, as shown in FIG. 5, the cylinders 8 are fitted to the outer ends of the cylinders 3 to 6C, respectively, and then set in the mold 18. The mold I8 has a V-groove 19 for holding the cylinder 8 in a fixed position and a cavity 20 for molding resin around the transparent resin block 7. When this mold 18 is covered with another mold (not shown) and resin is injected into the cavity 20 and molded, the external resin block 9 as shown in FIG. 6 can be formed. Block 9
By inserting a hollow male screw 10 into the outer periphery of the cylinder 9 protruding from the outside and fixing it to the external resin block 9, the optical coupling shown in FIG.
The duplexer is completed.

In the above embodiment, the cylindrical body was fixed to the outer end of the rod by molding an external resin block, but it is also possible to fix the cylindrical body to the outer end of the rod by adhesive or the like.

Further, in the above embodiment, a transparent resin block and an external resin block are provided, but these may be formed as an integral piece by two moldings, or rubber may be used instead of resin.

〔Effect of the invention〕

As explained above, according to the present invention, with the optical fiber inserted and fixed into the center of the rod, the end face can be processed and optical coupling can be performed.
Since it is possible to perform combinations for configuring the branching section, there is an advantage that manufacturing of the optical multiplexer/demultiplexer is facilitated. Further, since a cylinder for inserting an optical fiber connector is fixed to the end of the rod, there is an advantage that the optical fiber for the lead can be easily connected.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an optical combiner/demultiplexer according to an embodiment of the present invention, FIGS. 2 to 6 are explanatory diagrams showing the manufacturing process of the optical combiner/demultiplexer, and FIG. It is an explanatory view showing the basic structure of a wave device. 13~IC: Optical fiber, 5: Optical multiplexer/demultiplexer, 6a~6
C: Rod, 7: Transparent resin block, 8: Cylindrical body, 9: External resin block o7. Figure 1 Figure 2 Figure 3 16b 17 = 15 Figure 4 6C Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] A rod with an optical fiber inserted and fixed in the center of each is combined so that the optical fibers form an optical multiplexing/demultiplexing section, and in this state, the area around the optical multiplexing/demultiplexing section is solidified with a polymer block, and the polymer material is An optical multiplexer/demultiplexer characterized in that a cylindrical body for inserting an optical fiber connector is fitted and fixed to the outer end of the rod protruding from the block.