JPS6373208A - Optical branching device - Google Patents
Optical branching deviceInfo
- Publication number
- JPS6373208A JPS6373208A JP61220192A JP22019286A JPS6373208A JP S6373208 A JPS6373208 A JP S6373208A JP 61220192 A JP61220192 A JP 61220192A JP 22019286 A JP22019286 A JP 22019286A JP S6373208 A JPS6373208 A JP S6373208A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- curvature
- bent portion
- radius
- light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 title claims description 19
- 239000013307 optical fiber Substances 0.000 claims abstract description 61
- 239000000463 material Substances 0.000 claims description 10
- 238000005452 bending Methods 0.000 abstract description 8
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 238000003780 insertion Methods 0.000 description 5
- 230000037431 insertion Effects 0.000 description 5
- 230000001902 propagating effect Effects 0.000 description 4
- 238000005253 cladding Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000013308 plastic optical fiber Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000012780 transparent material Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/2804—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers
- G02B6/2852—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using tapping light guides arranged sidewardly, e.g. in a non-parallel relationship with respect to the bus light guides (light extraction or launching through cladding, with or without surface discontinuities, bent structures)
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4287—Optical modules with tapping or launching means through the surface of the waveguide
- G02B6/4289—Optical modules with tapping or launching means through the surface of the waveguide by inducing bending, microbending or macrobending, to the light guide
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mechanical Light Control Or Optical Switches (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、第１の光ファイバを破壊することなくこの第
１の光ファイバから第２の光ファイバへ光を分岐させる
ための光分岐器に関するものである。Detailed Description of the Invention [Field of Industrial Application] The present invention provides an optical splitter for branching light from a first optical fiber to a second optical fiber without destroying the first optical fiber. It is related to.
本発明は、上記の様な光分岐器において、第１の光ファ
イバを屈曲させ且つ屈曲部の曲率半径を変化させること
によって、第１の光ファイバから第２の光ファイバへ分
岐する光の割合を広範囲に変化させることができる様に
したものである。In the optical splitter as described above, the present invention bends the first optical fiber and changes the radius of curvature of the bent portion, thereby increasing the proportion of light that is branched from the first optical fiber to the second optical fiber. It is designed so that it can be varied over a wide range.
光通信システムや光波伝送系等においては、幹線光ファ
イバから分岐用光ファイバへ光を分岐させており、その
ために光分岐器が用いられている。In optical communication systems, light wave transmission systems, etc., light is branched from a trunk optical fiber to a branching optical fiber, and an optical branching device is used for this purpose.
光分岐器には各種のものがあるが、幹線光ファイバを破
壊することなくこの幹線光ファイバから分岐用光ファイ
バへ光を分岐させる光分岐器としては、例えば特願昭６
１−５７６７４号として本出願人が提案した光分岐器が
ある。There are various types of optical branching devices, but an optical branching device that branches light from a trunk optical fiber to a branching optical fiber without destroying the trunk optical fiber is, for example, a patent application published in 1986.
There is an optical splitter proposed by the present applicant as No. 1-57674.
この非破壊型の光分岐器は、幹線光ファイバを屈曲させ
、屈曲部において導波モードの光の一部を漏洩モードの
光へモード変換させ、このモード変換した光を分岐用光
ファイバへ分岐させるものである。This non-destructive optical splitter bends the main optical fiber, converts a portion of the waveguide mode light into leaky mode light at the bend, and branches this mode-converted light to a branching optical fiber. It is something that makes you
ところで、幹線光ファイバから一定量の光を取り出した
り、光フアイバネットワークシステムや光学機器内等に
おいて受信側のチーレベルに合わせて分岐光量を変化さ
せたりすることに対する要望がある。しかし従来の光分
岐器では、分岐光の割合を変化させることができなかっ
た。By the way, there is a demand for extracting a certain amount of light from a trunk optical fiber, or for changing the amount of branched light in accordance with the chi level on the receiving side in an optical fiber network system, optical equipment, or the like. However, with conventional optical splitters, it was not possible to change the ratio of branched light.
本発明による光分岐器は、屈曲部２ａを有する第１の光
ファイバ２と、前記屈曲部２ａから放射される光を受光
する様に一端部３ａが前記屈曲部２ａの近傍に配されて
いる第２の光ファイバ３と、前記屈曲部２ａの曲率半径
を変化させる手段５とを夫々具備している。The optical splitter according to the present invention includes a first optical fiber 2 having a bent portion 2a, and one end portion 3a disposed near the bent portion 2a so as to receive light emitted from the bent portion 2a. A second optical fiber 3 and means 5 for changing the radius of curvature of the bent portion 2a are respectively provided.
本発明による光分岐器では、第１の光ファイバ２の屈曲
部２ａの曲率半径を変化させる様にしているが、第１の
光フアイバ２中を伝搬している光のうちでモード変換に
よって屈曲部２ａから放射される光の割合は、屈曲部２
ａの曲率半径の変化に対して大きく変化する。従って、
第１の光ファイバ２から第２の光ファイバ３へ分岐する
光の割合も大きく変化する。In the optical splitter according to the present invention, the radius of curvature of the bent portion 2a of the first optical fiber 2 is changed. The proportion of light emitted from the bent portion 2a is
It changes greatly with respect to the change in the radius of curvature of a. Therefore,
The proportion of light branched from the first optical fiber 2 to the second optical fiber 3 also changes significantly.
以下、本発明の一実施例を第１図〜第３図を参照しなが
ら説明する。Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 3.
第１図に示す様に、本実施例は光フアイバ保持具１を有
しており、この光フアイバ保持具１によって幹線光ファ
イバ２が屈曲状態で保持されている。As shown in FIG. 1, this embodiment has an optical fiber holder 1, by which a trunk optical fiber 2 is held in a bent state.
光フアイバ保持具１には、幹線光ファイバ２の屈曲部２
ａの両側に連なっている直線部２ｂ１２Ｃのうちの一方
の直線部２ｂと同軸状に且つ屈曲部２ａに接する様に、
分岐用光ファイバ３の一端部３ａも保持されている。The optical fiber holder 1 includes a bent portion 2 of a trunk optical fiber 2.
coaxially with one straight part 2b of the straight parts 2b12C continuous on both sides of a and in contact with the bent part 2a,
One end 3a of the branching optical fiber 3 is also held.
幹線光ファイバ２の屈曲部２ａのクラッド２ｄと分岐用
光ファイバ３の一端部３ａの端面との間には、透光性材
料４が充填されている。なおこの透光性材料４は、高弾
性の樹脂やゲル状の材料である。A translucent material 4 is filled between the cladding 2d of the bent portion 2a of the trunk optical fiber 2 and the end surface of the one end portion 3a of the branching optical fiber 3. Note that the light-transmitting material 4 is a highly elastic resin or gel-like material.
また光フアイバ保持具１には、光フアイバ押圧部材５が
取り付けられている。この光フアイバ押圧部材５は、幹
線光ファイバ２の屈曲部２ａの略中央部と屈曲部２ａの
曲率中心とを結ぶ曲率半径に沿う様に延びており且つ外
周面にねじが形成されている軸部５ａと、球状や円柱状
を成している先端部５ｂとを有している。Further, an optical fiber pressing member 5 is attached to the optical fiber holder 1. The optical fiber pressing member 5 has a shaft extending along a radius of curvature connecting the approximate center of the bent portion 2a of the trunk optical fiber 2 and the center of curvature of the bent portion 2a, and has a thread formed on its outer peripheral surface. It has a portion 5a and a tip portion 5b having a spherical or cylindrical shape.
この様な本実施例では、幹線光ファイバ２中を直線部２
ｂから直線部２ｃへ向かう様に伝搬して来た光の一部は
、直線部２ｂと屈曲部２ａとの境界で導波モードから漏
洩モードへモード変換される。In this embodiment, the straight section 2 is inserted into the trunk optical fiber 2.
A part of the light propagating from b toward the straight portion 2c is mode-converted from a waveguide mode to a leaky mode at the boundary between the straight portion 2b and the bent portion 2a.
この様にモード変換された光は、透光性材料４中へ漏光
し、更に分岐用光フアイバ３中へ入射する。つまり、幹
線光ファイバ２中を伝搬して来た光の一部が、分岐用光
フアイバ３中へ分岐する。The mode-converted light in this manner leaks into the transparent material 4 and further enters the branching optical fiber 3. In other words, a part of the light propagating through the trunk optical fiber 2 is branched into the branching optical fiber 3.
なお、昭和６１年電子通信学会光・電波部門全国大会予
稿集３０８にも記載されている様に、透光性材料４の屈
折率の値を幹線光ファイバ２のクラッド２ｄの屈折率の
値以上に選定すれば、屈曲部２ａでクラッド２ｄと透光
性材料４との界面へ入射する漏洩モードの光の総てを、
透光性材キ４４中へ導くことができる。Furthermore, as stated in Proceedings of the 1986 Institute of Electronics and Communication Engineers National Conference, Optical and Radio Division, Proceedings 308, the value of the refractive index of the translucent material 4 is set to be greater than the value of the refractive index of the cladding 2d of the trunk optical fiber 2. If selected as
It can be guided into the transparent material 44.
更にまた本実施例では、光フアイバ押圧部材５を回転操
作することによって、先端部５ｂを屈曲部２ａの曲率半
径の方向へ進退させることができる。従って、先端部５
ｂを進退させ、この先端部５ｂから屈曲部２ａへ加えら
れる押圧力を調整することによって、屈曲部２ａの曲率
半径を変化させることができる。Furthermore, in this embodiment, by rotating the optical fiber pressing member 5, the tip portion 5b can be moved forward and backward in the direction of the radius of curvature of the bent portion 2a. Therefore, the tip 5
The radius of curvature of the bent portion 2a can be changed by moving the tip portion 5b forward or backward and adjusting the pressing force applied from the tip portion 5b to the bent portion 2a.
そして屈曲部２ａの曲率半径が変化すれば、この屈曲部
２ａにおける導波モードから漏洩モードへの変換の割合
が変化して、結果的に、幹線光ファイバ２から分岐用光
ファイバ３へ分岐する光量が変化する。If the radius of curvature of the bent portion 2a changes, the rate of conversion from the waveguide mode to the leaky mode in the bent portion 2a changes, and as a result, the trunk optical fiber 2 branches into the branching optical fiber 3. The amount of light changes.
なお、光フアイバ押圧部材５と幹線光ファイバ２とは互
いに固着されてはいない。また、透光性材料４は高弾性
の樹脂やゲル状の材料であるので屈曲部２ａの曲率半径
の変化によって幹線光ファイバ２の位置が変化しても、
この位置の変化に透光性材料４が追従する。Note that the optical fiber pressing member 5 and the trunk optical fiber 2 are not fixed to each other. Furthermore, since the translucent material 4 is a highly elastic resin or gel-like material, even if the position of the trunk optical fiber 2 changes due to a change in the radius of curvature of the bent portion 2a,
The translucent material 4 follows this change in position.
第２図は、光ファイバ２．３として直径１朋、クラッド
厚５μｍのプラスチック光ファイバを用い、また透光性
材料４として透明シリコングリースを用いた場合の、屈
曲部２ａの曲率半径と分岐比との関係を示している。Figure 2 shows the radius of curvature and branching ratio of the bent portion 2a when a plastic optical fiber with a diameter of 1 mm and a cladding thickness of 5 μm is used as the optical fiber 2.3, and transparent silicone grease is used as the translucent material 4. It shows the relationship between
ここで分岐比とは、
で定義される値であり、Ｐ２は直線部２ｂを伝搬して来
て直線部２Ｃから出力される光の強度であり、Ｐ３は直
線部２ｂを伝搬して来て屈曲部２ａで幹線光ファイバ２
から分岐用光ファイバ３へ分岐して一端部３ａから出力
される光の強度である。Here, the branching ratio is a value defined by, P2 is the intensity of light propagating through the straight section 2b and output from the straight section 2C, and P3 is the intensity of the light propagating through the straight section 2b. Trunk optical fiber 2 at bent part 2a
This is the intensity of light that is branched from the branching optical fiber 3 and output from the one end 3a.
この第２図から明らかな様に曲率半径の５ｆｌの差で６
ｄＢ以上の光出力変化が達成されるが、この様に曲率半
径を５ ＋＋ｎだけ変化させるための光フアイバ押圧部
材５の進退量は０．５Ｒ以下でよい。As is clear from this figure 2, a difference of 5 fl in the radius of curvature causes 6
Although a change in optical output of dB or more is achieved, the amount of movement of the optical fiber pressing member 5 in order to change the radius of curvature by 5++n may be 0.5R or less.
第３図は、第２図の場合と同様な条件での、屈曲部２ａ
の曲率半径と挿入損失との関係を示している。FIG. 3 shows the bent portion 2a under the same conditions as in FIG.
shows the relationship between the radius of curvature and insertion loss.
ここで挿入損失とは
で定義される値であり、幹線光ファイバ２を屈曲させて
いない状態で直線部２ｂを伝搬して来て直線部２Ｃから
出力される光の強度をＰｏで示している。Here, the insertion loss is a value defined by Po, which is the intensity of the light that propagates through the straight section 2b and is output from the straight section 2C when the main optical fiber 2 is not bent. .
この第３図から明らかな様に、本実施例では、非常に低
い挿入損失での分岐が達成されている。As is clear from FIG. 3, this embodiment achieves branching with extremely low insertion loss.
なお、第２図及び第３図の何れにおいても曲率半径が１
０〜１５ｍｍの範囲で分岐比や挿入損失が示されている
が、プラスチック光ファイバは屈曲性及び弾性に富んで
いるので、更に広い範囲で曲率半径を変化させることが
できる。In addition, in both Fig. 2 and Fig. 3, the radius of curvature is 1.
The branching ratio and insertion loss are shown to be in the range of 0 to 15 mm, but since plastic optical fibers have high flexibility and elasticity, the radius of curvature can be changed over a wider range.
本発明による光分岐器では、第１の光ファイバの屈曲部
の曲率半径を変化させる様にしているので、第１の光フ
ァイバから第２の光ファイバへ分岐する光の割合を広範
囲に変化させることができる。In the optical splitter according to the present invention, since the radius of curvature of the bent portion of the first optical fiber is changed, the proportion of light branched from the first optical fiber to the second optical fiber can be varied over a wide range. be able to.
第１図は本発明の一実施例の側断面図、第２図及び第３
図は一実施例の夫々曲率半径と分岐比及び挿入損失との
関係を示すグラフである。
なお図面に用いた符号において、
２−・・−・・〜・・−・−・幹線光ファイバ２ａ−・
−・−・−・−・−屈曲部
３−・−・−・−・−・・・−・・分岐用光ファイバ３
ａ−・−−一−−−−−・・・・−一端部５−・−・−
・〜・−・−・・光フアイバ押圧部材である。FIG. 1 is a side sectional view of one embodiment of the present invention, FIGS.
The figure is a graph showing the relationship between the radius of curvature, branching ratio, and insertion loss in one embodiment. In addition, in the symbols used in the drawings, 2-・・−・・〜・・−・−・Trunk optical fiber 2a−・
−・−・−・−・−Bending part 3−・−・−・−・−・・・・−・Branching optical fiber 3
a-・--1--------...-One end 5--・--
・〜・−・−・・Optical fiber pressing member.
Claims (1)
記屈曲部の近傍に配されている第２の光ファイバと、 前記屈曲部の曲率半径を変化させる手段とを夫夫具備す
る光分岐器。 ２、前記曲率半径を変化させる前記手段が前記屈曲部の
曲率中心側から前記曲率半径の方向へ前記屈曲部を押圧
する手段である特許請求の範囲第１項に記載の光分岐器
。 ３、高弾性の透光性材料から成る成形品が前記屈曲部と
前記一端部との間に充填されている特許請求の範囲第１
項または第２項に記載の光分岐器。 ４、ゲル状の透光性材料が前記屈曲部と前記一端部との
間に充填されている特許請求の範囲第１項または第２項
に記載の光分岐器。[Claims] 1. A first optical fiber having a bent portion; and a second optical fiber having one end disposed near the bent portion so as to receive light emitted from the bent portion. and means for changing the radius of curvature of the bent portion. 2. The optical splitter according to claim 1, wherein the means for changing the radius of curvature is means for pressing the bent portion from the center of curvature of the bent portion in the direction of the radius of curvature. 3. Claim 1, wherein a molded product made of a highly elastic translucent material is filled between the bent portion and the one end portion.
The optical splitter according to item 1 or 2. 4. The optical splitter according to claim 1 or 2, wherein a gel-like translucent material is filled between the bent portion and the one end portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61220192A JPS6373208A (en) | 1986-09-17 | 1986-09-17 | Optical branching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61220192A JPS6373208A (en) | 1986-09-17 | 1986-09-17 | Optical branching device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6373208A true JPS6373208A (en) | 1988-04-02 |
Family
ID=16747325
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61220192A Pending JPS6373208A (en) | 1986-09-17 | 1986-09-17 | Optical branching device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6373208A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015219512A (en) * | 2014-05-21 | 2015-12-07 | 日本電信電話株式会社 | Manufacturing method of optical fiber lateral input/output device |
| JP2018063392A (en) * | 2016-10-14 | 2018-04-19 | 日本電信電話株式会社 | Optical fiber lateral input/output device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60254104A (en) * | 1984-05-07 | 1985-12-14 | ノーザン・テレコム・リミテツド | Optical fiber coupler |
| JPS6114607A (en) * | 1984-06-21 | 1986-01-22 | エイビイ・エレクトロニック・コンポーネンツ・リミテッド | Optical fiber coupler |
-
1986
- 1986-09-17 JP JP61220192A patent/JPS6373208A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60254104A (en) * | 1984-05-07 | 1985-12-14 | ノーザン・テレコム・リミテツド | Optical fiber coupler |
| JPS6114607A (en) * | 1984-06-21 | 1986-01-22 | エイビイ・エレクトロニック・コンポーネンツ・リミテッド | Optical fiber coupler |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015219512A (en) * | 2014-05-21 | 2015-12-07 | 日本電信電話株式会社 | Manufacturing method of optical fiber lateral input/output device |
| JP2018063392A (en) * | 2016-10-14 | 2018-04-19 | 日本電信電話株式会社 | Optical fiber lateral input/output device |
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