JPS6213642B2 - - Google Patents
Info
- Publication number
- JPS6213642B2 JPS6213642B2 JP54162497A JP16249779A JPS6213642B2 JP S6213642 B2 JPS6213642 B2 JP S6213642B2 JP 54162497 A JP54162497 A JP 54162497A JP 16249779 A JP16249779 A JP 16249779A JP S6213642 B2 JPS6213642 B2 JP S6213642B2
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- optical
- variable attenuator
- distance
- core
- 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.)
- Expired
Links
- 239000013307 optical fiber Substances 0.000 claims description 32
- 230000003287 optical effect Effects 0.000 claims description 16
- 238000005253 cladding Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000000835 fiber Substances 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
- G02B6/264—Optical coupling means with optical elements between opposed fibre ends which perform a function other than beam splitting
- G02B6/266—Optical coupling means with optical elements between opposed fibre ends which perform a function other than beam splitting the optical element being an attenuator
Description
【発明の詳細な説明】 本発明は光強度の可変減衰器に関する。[Detailed description of the invention] The present invention relates to a variable attenuator for light intensity.
光通信における遠距離伝送システムの評価試験
を行なう場合等において、遠距離光伝送路の疑似
回路として第１図に示す一対の光フアイバを所定
の間隔をあけて対向させたものが用いられる。 When performing an evaluation test of a long-distance transmission system in optical communication, a pair of optical fibers shown in FIG. 1 are used as a pseudo circuit for a long-distance optical transmission line, with a pair of optical fibers facing each other at a predetermined distance.
同図において１は送信側光フアイバ、２は受信
側光フアイバである。光フアイバ１より角度θを
もつて出射された光信号３のうち一部が光フアイ
バ２に入射し、その量は光フアイバ１と２との間
隔Ｌにより増減する。即ちかかる一対の光フアイ
バを所定の間隔Ｌをあけて対向させることにより
光強度の減衰器が構成され、減衰量は間隔Ｌを調
整することにより可変し得る。 In the figure, 1 is an optical fiber on the transmitting side, and 2 is an optical fiber on the receiving side. A part of the optical signal 3 emitted from the optical fiber 1 at an angle θ enters the optical fiber 2, and the amount increases or decreases depending on the distance L between the optical fibers 1 and 2. That is, a light intensity attenuator is constructed by arranging such a pair of optical fibers facing each other with a predetermined distance L between them, and the amount of attenuation can be varied by adjusting the distance L.
従つて上記可変減衰器を用いて遠距離光伝送路
と等価の減衰量を設定することにより、疑似遠距
離光伝送路を構成して遠距離光伝送システムの評
価試験等を行なうことができる。 Therefore, by setting an attenuation amount equivalent to that of a long-distance optical transmission line using the variable attenuator, a pseudo long-distance optical transmission line can be constructed to perform evaluation tests of long-distance optical transmission systems.
しかし上記光フアイバ２は第２図に示すごと
く、コア４部に入射する光信号成分５にクラツド
６部に入射する光成分７が洩れて来るため、上述
の減衰量は第３図に示す曲線Ａのごとくフアイバ
の間隔Ｌとの間に一義的な関係が成り立たない。 However, as shown in FIG. 2, in the optical fiber 2, the optical signal component 7 that is incident on the cladding 6 leaks into the optical signal component 5 that is incident on the core 4, so that the above-mentioned attenuation is calculated by the curve shown in FIG. As shown in A, there is no unambiguous relationship with the fiber spacing L.
本発明の目的は上記問題点を解消してクラツド
部よりコア部に洩れる光信号成分を除去すること
にある。 SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and eliminate optical signal components leaking from the cladding to the core.
本発明の可変減衰器の特徴は、対向する一対の
光フアイバ端面に、少なくともコア部表面に開口
を有する遮光膜を具備せしめたことにある。 The variable attenuator of the present invention is characterized in that the end faces of a pair of opposing optical fibers are provided with a light-shielding film having an opening on at least the surface of the core portion.
以下本発明の実施例を図面により説明する。 Embodiments of the present invention will be described below with reference to the drawings.
第４図は本発明の要部である端面に遮光膜を設
けた光フアイバを示す要部側面図である。 FIG. 4 is a side view of a main part of an optical fiber having a light-shielding film on its end face, which is a main part of the present invention.
同図に示すように本実施例ではコア４とクラツ
ド６よりなる光フアイバ１２の端面にアルミニウ
ム（Al）よりなる遮光膜１３を被着せしめ、コ
ア４部表面を選択的に除去して開口１４を形成し
た。 As shown in the figure, in this embodiment, a light shielding film 13 made of aluminum (Al) is coated on the end face of an optical fiber 12 consisting of a core 4 and a cladding 6, and the surface of the core 4 is selectively removed to form an opening 14. was formed.
該開口１４の径は図示のごとくコア４の径より
小さくても、或いはコア４の径より大きくても良
く、減衰量の所要値により決定する。 The diameter of the opening 14 may be smaller than the diameter of the core 4 as shown, or larger than the diameter of the core 4, and is determined depending on the required amount of attenuation.
このように形成した光フアイバを用いて構成し
た可変減衰器について第５図により説明する。 A variable attenuator constructed using the optical fiber thus formed will be explained with reference to FIG.
同図において１１は送信側光フアイバ、１２は
受信側光フアイバ、１３は前述の遮光膜である。
光信側光フアイバ１１より出射された光信号のう
ち受信側光フアイバ１２のクラツド６部に向かう
光信号成分７は遮光膜１３に遮られてクラツド６
に入射することはない。従つてコア４に入射した
光信号成分５は何ら騒乱を受けないので減衰量は
第３図の曲線Ｂに示すように光フアイバ１１と１
２との間隔Ｌの増加に伴なつて増大する。 In the figure, 11 is a transmitting side optical fiber, 12 is a receiving side optical fiber, and 13 is the above-mentioned light shielding film.
Of the optical signals emitted from the optical fiber 11 on the optical receiving side, the optical signal component 7 directed toward the cladding 6 of the optical fiber 12 on the receiving side is blocked by the light shielding film 13 and passes through the cladding 6.
It is never incident on . Therefore, since the optical signal component 5 incident on the core 4 is not disturbed at all, the amount of attenuation between the optical fibers 11 and 1 is as shown by curve B in FIG.
It increases as the distance L from 2 increases.
本実施例に示すごとく端面に少なくともコア部
に開口を有する遮光膜を具備した一対の光フアイ
バを対向させ、両者の間隔を調整することにより
所望の減衰量を得ることができる。 As shown in this embodiment, a desired amount of attenuation can be obtained by arranging a pair of optical fibers each having a light-shielding film having an opening at least in the core on the end face and facing each other, and adjusting the distance between the two.
第６図及び第７図は本発明の他の実施例を示す
要部断面図で、送信側光フアイバ１１の出射端を
光軸に対して斜めに切断したものである。 FIGS. 6 and 7 are main part sectional views showing other embodiments of the present invention, in which the output end of the transmitting side optical fiber 11 is cut obliquely with respect to the optical axis.
このようにすることによりコア４部表面を被覆
する遮光膜１３端部で反射する光成分１５は光フ
アイバ系外に出射され、送信側光フアイバ１１内
を逆進する成分を大巾に減少させることができ
る。 By doing this, the light component 15 reflected at the end of the light-shielding film 13 covering the surface of the core 4 is emitted to the outside of the optical fiber system, and the component traveling backward in the transmitting optical fiber 11 is greatly reduced. be able to.
本発明に係る可変減衰器は単一モード光フアイ
バを用いても或いは多モード光フアイバを用いて
も構成することができる。 The variable attenuator according to the invention can be constructed using a single mode optical fiber or a multimode optical fiber.
また前記実施例では送信側光フアイバ出射端端
面に遮光膜１３を具備せしめて説明したが、これ
は送信側と受信側とを逆転させて使用するため
で、送信側及び受信側がそれぞれ固定される場合
は送信側光フアイバの出射面には遮光膜を設ける
必要はない。 Furthermore, in the above embodiment, the light shielding film 13 is provided on the output end face of the transmitting side optical fiber, but this is because the transmitting side and the receiving side are used in reverse, so that the transmitting side and the receiving side are fixed respectively. In this case, there is no need to provide a light-shielding film on the output surface of the transmitting optical fiber.
以上説明したごとく本発明によればクラツド部
に入射しコア部へ洩れ出る光信号成分が存在しな
いので、一対の光フアイバの間隔を調節するのみ
で所望の減衰量が得られる可変減衰器を構成する
ことができる。 As explained above, according to the present invention, since there is no optical signal component that enters the cladding part and leaks out to the core part, a variable attenuator is constructed in which a desired amount of attenuation can be obtained simply by adjusting the distance between a pair of optical fibers. can do.
第１図は光強度の可変減衰器の原理を示す要部
正面図、第２図は従来の可変減衰器の説明に供す
る要部断面図、第３図は可変減衰器の光フアイバ
間隔に対する減衰量を示す曲線図、第４図は本発
明の要部である光フアイバ端面の構造の実施例を
示す要部断面図、第５図は本発明の可変減衰器の
実施例を示す要部断面図、第６図及び第７図は本
発明の他の実施例を示す要部断面図である。
４……コア、６……クラツド、１１，１２……
光フアイバ、１３……遮光膜、１４……開口。
Figure 1 is a front view of the main parts showing the principle of a variable attenuator for light intensity, Figure 2 is a sectional view of the main parts to explain a conventional variable attenuator, and Figure 3 is attenuation with respect to the optical fiber spacing of the variable attenuator. 4 is a cross-sectional view of the main part showing an embodiment of the structure of the optical fiber end face, which is the main part of the present invention. FIG. 5 is a cross-sectional view of the main part showing an embodiment of the variable attenuator of the present invention. 6 and 7 are sectional views of main parts showing other embodiments of the present invention. 4... Core, 6... Clad, 11, 12...
Optical fiber, 13... light shielding film, 14... aperture.
Claims (1)
可変にすることにより光減衰量を可変にする可変
減衰器に於いて、 対向する光フアイバ端面のコア部表面に開口部
を有する遮光膜を具備せしめたことを特徴とする
可変減衰器。[Claims] 1. In a variable attenuator that varies the amount of optical attenuation by varying the distance between the end faces of a pair of opposing optical fibers, an opening is formed on the core surface of the opposing optical fiber end faces. A variable attenuator characterized by comprising a light shielding film having:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16249779A JPS5685702A (en) | 1979-12-14 | 1979-12-14 | Variable attenuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16249779A JPS5685702A (en) | 1979-12-14 | 1979-12-14 | Variable attenuator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5685702A JPS5685702A (en) | 1981-07-13 |
| JPS6213642B2 true JPS6213642B2 (en) | 1987-03-27 |
Family
ID=15755738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16249779A Granted JPS5685702A (en) | 1979-12-14 | 1979-12-14 | Variable attenuator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5685702A (en) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2533323A1 (en) * | 1982-09-17 | 1984-03-23 | Thomson Csf | Variable optical attenuator device. |
| JPS60133413A (en) * | 1983-12-21 | 1985-07-16 | Matsushita Electric Ind Co Ltd | Optical attenuator |
| JPS60173908U (en) * | 1984-04-27 | 1985-11-18 | 日立電線株式会社 | Cladding mode elimination polarization preserving optical fiber |
| JPH01255803A (en) * | 1988-04-06 | 1989-10-12 | Nec Corp | Optical fixed attenuator |
| US5050956A (en) * | 1990-09-20 | 1991-09-24 | Hunter Associates Laboratory Inc. | Optical fiber attenuator and connecting element |
| US6516114B2 (en) | 2000-06-27 | 2003-02-04 | Oluma, Inc. | Integration of fibers on substrates fabricated with grooves |
| US6625349B2 (en) | 2000-06-27 | 2003-09-23 | Oluma, Inc. | Evanescent optical coupling between a waveguide formed on a substrate and a side-polished fiber |
| US6621951B1 (en) | 2000-06-27 | 2003-09-16 | Oluma, Inc. | Thin film structures in devices with a fiber on a substrate |
| US6597833B1 (en) | 2000-06-27 | 2003-07-22 | Oluma, Inc. | Wavelength-division multiplexers and demultiplexers based on mach-zehnder interferometers and evanescent coupling |
| US6501875B2 (en) | 2000-06-27 | 2002-12-31 | Oluma, Inc. | Mach-Zehnder inteferometers and applications based on evanescent coupling through side-polished fiber coupling ports |
| US6490391B1 (en) | 2000-07-12 | 2002-12-03 | Oluma, Inc. | Devices based on fibers engaged to substrates with grooves |
| US6621952B1 (en) | 2000-08-10 | 2003-09-16 | Oluma, Inc. | In-fiber variable optical attenuators and modulators using index-changing liquid media |
| US6571035B1 (en) | 2000-08-10 | 2003-05-27 | Oluma, Inc. | Fiber optical switches based on optical evanescent coupling between two fibers |
| US6542663B1 (en) | 2000-09-07 | 2003-04-01 | Oluma, Inc. | Coupling control in side-polished fiber devices |
| GB0219794D0 (en) * | 2002-08-23 | 2002-10-02 | Alcatel Optronics Uk Ltd | A variable optical attenuator |
| DE102022206728A1 (en) | 2022-06-30 | 2024-01-04 | Micro-Epsilon Optronic Gmbh | Device for conducting measuring light to be spectrally analyzed and method for producing such a device and device for measuring distance and thickness |
-
1979
- 1979-12-14 JP JP16249779A patent/JPS5685702A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5685702A (en) | 1981-07-13 |
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