JPS6345514U

JPS6345514U -

Info

Publication number: JPS6345514U
Application number: JP13856186U
Authority: JP
Priority date: 1986-09-11
Filing date: 1986-09-11
Publication date: 1988-03-28

Description

[Brief explanation of the drawing]

第１図は、本考案による、屈折率分布型テーパ
型ロツドレンズを用いた複芯光フアイバの分岐接
続器の一実施例を示す斜視図、第２図は、屈折率
分布型テーパ形ロツドレンズの一例の構造を示す
断面図、第３図は、屈折率分布型テーパ形ロツド
レンズ中の光線の軌跡を示す図、第４図ａおよび
ｂは、屈折率分布型テーパ形ロツドレンズの製造
方法の説明図、第５図ａおよびｂは、代表的な複
芯光フアイバの２例として、平形複芯光フアイバ
および星形複芯光フアイバの断面構造を、それぞ
れ、示す断面図、第６図は、従来の２個の屈折率
分布型ロツドレンズを用いた複芯光フアイバの分
岐装置の一例を示す斜視図である。１ｂ―１Ａ，１ｂ―１Ｂ，１ｂ―１Ｃ，１ｂ―
１Ｄ，１ｂ―１Ｅ……クラツド部、１ｂ―２Ａ，
１ｂ―２Ｂ，１ｂ―２Ｃ，１ｂ―２Ｄ，１ｂ―２
Ｅ……コア部、１ｂ―１Ａ，１ｂ―１Ｂ，１ｂ―
１Ｃ，１ｂ―１Ｄ，１ｂ―１Ｅ……クラツド部、
１ｂ―２Ａ，１ｂ―２Ｂ，１ｂ―２Ｃ，１ｂ―２
Ｄ，１ｂ―２Ｅ……コア部、１ｂ―３……中心材
、２―１Ａ，２―１Ｂ……円筒形の屈折分布型ロ
ツドレンズ、２―２Ａ，２―２Ｂ，２―２Ｃ，２
―２Ｄ，２―２Ｅ……単心の標準的な光フアイバ
、２―３……複芯光フアイバ、３―１……屈折率
分布型テーパ形ロツドレンズ、３―２Ａ，３―２
Ｂ，３―２Ｃ，３―２Ｄ，３―２Ｅ……単芯の標
準的な光フアイバ、３―３……複芯光フアイバ、
６―１……金型、６―２……加圧金型、６―３ｂ
……円筒形ロツドレンズ、６―３ｂ……整形後の
屈折率分布型テーパ形ロツドレンズ、６―４……
ヒータ、６―５……加圧方向、６―６……円筒部
、６―７……テーパ部。 Fig. 1 is a perspective view showing an embodiment of a multi-core optical fiber branching connector using a gradient index tapered rod lens according to the present invention, and Fig. 2 is an example of a gradient index tapered rod lens. FIG. 3 is a diagram showing the trajectory of a light ray in a gradient index tapered rod lens, FIGS. 4 a and b are explanatory diagrams of a method for manufacturing a gradient index tapered rod lens, 5a and 5b are cross-sectional views showing the cross-sectional structures of a flat multi-core optical fiber and a star-shaped multi-core optical fiber, respectively, as two typical examples of multi-core optical fibers, and FIG. 6 is a cross-sectional view of a conventional multi-core optical fiber. FIG. 2 is a perspective view showing an example of a multi-core optical fiber branching device using two gradient index rod lenses. 1b-1A, 1b-1B, 1b-1C, 1b-
1D, 1b-1E... Clad part, 1b-2A,
1b-2B, 1b-2C, 1b-2D, 1b-2
E...core part, 1b-1A, 1b-1B, 1b-
1C, 1b-1D, 1b-1E... Clad part,
1b-2A, 1b-2B, 1b-2C, 1b-2
D, 1b-2E... Core part, 1b-3... Center material, 2-1A, 2-1B... Cylindrical refractive index distribution type rod lens, 2-2A, 2-2B, 2-2C, 2
-2D, 2-2E...Single-core standard optical fiber, 2-3...Multi-core optical fiber, 3-1...Gradient index tapered rod lens, 3-2A, 3-2
B, 3-2C, 3-2D, 3-2E...Single-core standard optical fiber, 3-3...Multi-core optical fiber,
6-1...Mold, 6-2...Pressure mold, 6-3b
...Cylindrical rod lens, 6-3b...Gradient index tapered rod lens after shaping, 6-4...
Heater, 6-5...pressure direction, 6-6...cylindrical part, 6-7...tapered part.

Claims

[Claims for Utility Model Registration] One end face of a tapered rod lens whose external shape changes smoothly in the central axis direction is the xy plane, the central axis is common to the Z axis, and when the Z axis coordinate is zero and when the Z axis is Z. The radii of are ρ ₀ and ρ(z) respectively, the angle between the generatrix of the cone and the central axis when the taper outer periphery is extended into a conical shape is α (α>0), the length of the rod lens is l, When the refractive index on the central axis is n ₀ and the refractive index distribution coefficient is A/ρ(z) (A: constant), the rod lens has the following formula: n(x,y)=no{1-(1/2) )(Ap(2
)) ² (x ² + y ² )} and has a refractive index distribution n(x, y), and one end face of the rod lens is brought into contact with the end face of a multi-core optical fiber having a plurality of cores arranged in a common cladding. and bringing each end face of a plurality of single-core optical fibers into contact with the other end face of the rod lens, and increasing the core center spacing of the multi-core optical fiber by k times (k>0) by the rod lens,
constant conditions for creating an inverted imaging system by branching into the plurality of single-core optical fibers and having an image on the one end surface of the rod lens on the other end surface having a magnification of k times (k>0); A multi-core optical fiber branch connector, characterized in that: