JPH01279206A - Light fixing attenuator - Google Patents
Light fixing attenuatorInfo
- Publication number
- JPH01279206A JPH01279206A JP63108943A JP10894388A JPH01279206A JP H01279206 A JPH01279206 A JP H01279206A JP 63108943 A JP63108943 A JP 63108943A JP 10894388 A JP10894388 A JP 10894388A JP H01279206 A JPH01279206 A JP H01279206A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- diameter
- ferrule
- optical
- attenuator
- 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
- 239000013307 optical fiber Substances 0.000 claims abstract description 40
- 239000013308 plastic optical fiber Substances 0.000 claims abstract description 14
- 230000003287 optical effect Effects 0.000 claims description 37
- 239000000463 material Substances 0.000 abstract description 7
- 238000010438 heat treatment Methods 0.000 abstract description 6
- 239000011521 glass Substances 0.000 abstract 1
- 230000007704 transition Effects 0.000 abstract 1
- 230000005540 biological transmission Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 3
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 2
- 239000004926 polymethyl methacrylate Substances 0.000 description 2
- 238000007740 vapor deposition Methods 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate 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
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/421—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical component consisting of a short length of fibre, e.g. fibre stub
-
- 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
-
- 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
- G02B6/36—Mechanical coupling means
- G02B6/38—Mechanical coupling means having fibre to fibre mating means
- G02B6/3807—Dismountable connectors, i.e. comprising plugs
- G02B6/3833—Details of mounting fibres in ferrules; Assembly methods; Manufacture
-
- 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
- G02B6/36—Mechanical coupling means
- G02B6/38—Mechanical coupling means having fibre to fibre mating means
- G02B6/3807—Dismountable connectors, i.e. comprising plugs
- G02B6/3833—Details of mounting fibres in ferrules; Assembly methods; Manufacture
- G02B6/3846—Details of mounting fibres in ferrules; Assembly methods; Manufacture with fibre stubs
-
- 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
- G02B6/36—Mechanical coupling means
- G02B6/38—Mechanical coupling means having fibre to fibre mating means
- G02B6/3807—Dismountable connectors, i.e. comprising plugs
- G02B6/3869—Mounting ferrules to connector body, i.e. plugs
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mechanical Coupling Of Light Guides (AREA)
- Light Guides In General And Applications Therefor (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、光伝送路の光量調整や光伝送特性の測定、試
験等に用いる小型かつ軽量の光固定減衰器に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a small and lightweight optical fixed attenuator used for adjusting the light amount of an optical transmission line, measuring and testing optical transmission characteristics, and the like.
従来技術として、第４図に示すように、中心軸上に光フ
ァイバ２をそれぞれ有する光コネクタプラグのフェルー
ル１７．１７′を対向させ、その間に光軸調整用レンズ
１６．１６’や減光素子１２を挿入したものがある。ま
た、他の光減衰器として、第５図に示すように、スリー
ブ１５の中央部に光ファイバ２が中心軸上に挿入された
円筒部材１８とその端面に設けた傾斜面に金属等の減衰
１ｔ１２を蒸着したものがある（特開昭５９−９４７０
２）。さらに、他の光減衰器として、第６図に示すよう
に、光ファイバ２の一方の鏡面を有する端面に金属等の
蒸着１１Ａ１２を形成し、他方の光ファイバの端面を融
着接続したものがある（特開昭５５−７９４０２）。As a conventional technique, as shown in FIG. 4, ferrules 17 and 17' of optical connector plugs each having an optical fiber 2 on the central axis are placed opposite each other, and an optical axis adjustment lens 16 and 16' and a light attenuation element are placed between them. There is one with 12 inserted. As another optical attenuator, as shown in FIG. There is one in which 1t12 is vapor-deposited (Japanese Patent Application Laid-Open No. 59-9470)
2). Furthermore, as another optical attenuator, as shown in FIG. 6, there is one in which vapor deposition 11A12 of metal or the like is formed on one end face having a mirror surface of the optical fiber 2, and the end face of the other optical fiber is fusion-spliced. There is (Japanese Patent Application Laid-Open No. 55-79402).
しかし、上記の光減衰器は、部品点数が多く、構成が複
雑であり、またそれぞれの部品（光学部品）の設置には
、高い位置精度が要求される。加えて、光減衰膜を付加
するために、高精度に膜厚を制御することのできる蒸着
機等の大規模な装置を必要とする。However, the above-mentioned optical attenuator has a large number of parts, has a complicated configuration, and requires high positional accuracy when installing each part (optical part). In addition, in order to add a light attenuation film, large-scale equipment such as a vapor deposition machine that can control the film thickness with high precision is required.
より簡便な構造の光減衰器として、本出願人は、既に実
願昭６２−１３４５２５号において、光入射側と光出射
側との間に幹線の光ファイバより小径の透光性素材より
なる棒状体を光伝送方向に沿って配置した光固定減衰器
を提案した。この場合、光減衰量に応じて、前記透光性
素材よりなる棒状体（光ファイバ等）の径を調節する必
要があるが、この調節は困難であるため、前記考案では
、該棒状体と光ファイバ端面間の隙間量を微調整するこ
とにより、光減衰量の調整を行う構造をとっている。し
かしながら、この場合、隙間量を大きくすればするほど
、棒状体に入射する光の分布パターンにより減衰量の変
動が起こるという問題があった。As an optical attenuator with a simpler structure, the present applicant has already proposed in Utility Application No. 62-134525 a rod-shaped light-transmitting material made of a light-transmitting material with a smaller diameter than the main optical fiber between the light input side and the light output side. An optical fixed attenuator whose body is placed along the optical transmission direction is proposed. In this case, it is necessary to adjust the diameter of the rod-shaped body (optical fiber, etc.) made of the translucent material according to the amount of light attenuation, but since this adjustment is difficult, The structure is such that the amount of optical attenuation is adjusted by finely adjusting the amount of gap between the end faces of the optical fibers. However, in this case, there was a problem in that the larger the gap amount, the more the attenuation amount fluctuated depending on the distribution pattern of the light incident on the rod-shaped body.
本発明は、上記の点に泡みてなされたもので、より簡便
な構造を有し、大規模な装置を要せず、しかも光減衰量
が入射光の分布パターンによらず一定である光減衰器を
提供しようとするものである。The present invention has been made in consideration of the above points, and has a simpler structure, does not require large-scale equipment, and has a light attenuation that is constant regardless of the distribution pattern of incident light. It is an attempt to provide a vessel.
本発明は、幹線の光ファイバ径に対して光減衰量に応じ
て決定した、該光ファイバ径より小さい内１条をもつフ
ェルール内に該フェルール径より小径のプラスチック光
ファイバを挿入し、加熱することにより光フーイバ径を
増大させ、該フェルール内径と同一としたことを特徴と
する光固定減衰器を提供する。In the present invention, a plastic optical fiber having a diameter smaller than the ferrule diameter is inserted into a ferrule having one thread smaller than the diameter of the optical fiber, which is determined according to the amount of optical attenuation with respect to the diameter of the main optical fiber, and heated. The present invention provides a fixed optical attenuator characterized in that the diameter of the optical fiber is increased to be the same as the inner diameter of the ferrule.
本発明の光固定′ｌＮｉ、衰器は、光ファイバ間および
／または受発光素子と光ファイバ間に挿入して用いるこ
とができる。本発明の光固定４．衰器において、上記フ
ェルールは雌雄両プラグと一体構造をなしていてもよい
。The optical fixing 'lNi and attenuator of the present invention can be used by being inserted between optical fibers and/or between a light receiving/emitting element and an optical fiber. Optical fixation of the present invention 4. In the attenuator, the ferrule may have an integral structure with both male and female plugs.
以下、本発明の実施例を添付の図面に従って詳細に説明
する。Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
第１図は１、本発明の光固定減衰器の細径光ファイバ部
の製造プロセスを示すものである。断面図（ａ）に示す
如く、フェルール２４内に形成された貫通孔３２の、光
減衰量に応じて決定された内径より小径の、ただしフェ
ルール径より十分長いプラスチック光ファイバ３４を、
貫通孔３２に挿入し、加熱する。加熱温度はプラスチッ
ク光ファイバを構成する材料のガラス転移温度以上であ
ることが必要であり、ＰＭＭＡ系光ファイバの場合には
１２０〜２００ ’Ｃ程度が最適である。また、これに
よりフェルール部分が変形することは望ましくないため
、フェルールを構成する材料は加熱温度以上の耐熱性を
有することが必要である。FIG. 1 shows a manufacturing process of a small-diameter optical fiber portion of a fixed optical attenuator according to the present invention. As shown in cross-sectional view (a), a plastic optical fiber 34 having a smaller diameter than the inner diameter determined according to the amount of optical attenuation of the through hole 32 formed in the ferrule 24, but sufficiently longer than the ferrule diameter, is
It is inserted into the through hole 32 and heated. The heating temperature must be higher than the glass transition temperature of the material constituting the plastic optical fiber, and in the case of a PMMA optical fiber, it is optimally about 120 to 200'C. Further, since it is undesirable for the ferrule portion to be deformed due to this, the material constituting the ferrule needs to have heat resistance higher than the heating temperature.
以上の工程の間に、プラスチック光ファイバは匡さ方向
に収縮し、径が増大して第１図（ｂ）、に示すようにフ
ェルール内径と一致する。よって、予め光減衰量に応じ
てフェルールの内径を決定しておけば、フェルール内に
挿入する細径光ファイバの径によらず、所定の光減衰量
を得ることができる。During the above steps, the plastic optical fiber contracts in the direction of its length and its diameter increases until it matches the inner diameter of the ferrule, as shown in FIG. 1(b). Therefore, if the inner diameter of the ferrule is determined in advance according to the amount of optical attenuation, a predetermined amount of optical attenuation can be obtained regardless of the diameter of the small optical fiber inserted into the ferrule.
また、第１図（Ｃ）および（ｄ）には、上記フェルール
２４に対する光ファイバ３４の固定方法の一例が示され
ている。前述の方法によりフェルール内径き一致させた
光ファイバを該フェルールよりも先端を少し長く残し、
切断する（Ｃ）、次に、該光ファイバ３４の両端を加熱
するごとにより熔融鏡面仕−Ｆげをする（ｄ）。これに
より、フェルール２４に対する光ファイバ３４の固定と
該光ファイバの両端面の処理とを同時に効率よく行うこ
とができる。Further, FIGS. 1C and 1D show an example of a method of fixing the optical fiber 34 to the ferrule 24. The optical fiber whose inner diameter was matched with the ferrule by the method described above was left at the tip slightly longer than the ferrule.
The optical fiber 34 is cut (C), and then both ends of the optical fiber 34 are heated to give a molten mirror finish (d). Thereby, it is possible to efficiently fix the optical fiber 34 to the ferrule 24 and process both end faces of the optical fiber at the same time.
第２図は、本発明に係る光固定減衰器の一実施例を示す
断面図である。FIG. 2 is a sectional view showing an embodiment of the optical fixed attenuator according to the present invention.
この光固定減衰器２０は、前記フェルール２４とホルダ
２２を有している。ホルダ２２は光伝送方向を長さ方向
とする筒体であり、右半部において、外面には光ファイ
バ用コネクタのレセプタクルの雄ネジ部と同一の特性を
もつ雄ネジ部２６が適宜の長さにわたって形成されてお
りかつ内部には光ファイバ用コネクタのレセプタクルと
同様の光ファイバ受入れ用貫通孔２８が形成されている
。This fixed optical attenuator 20 includes the ferrule 24 and the holder 22. The holder 22 is a cylindrical body whose length direction is in the light transmission direction, and in the right half thereof, a male threaded portion 26 having the same characteristics as the male threaded portion of the receptacle of the optical fiber connector is provided on the outer surface with an appropriate length. A through hole 28 for receiving an optical fiber similar to a receptacle of an optical fiber connector is formed inside.
また、左半部において、内面には光ファイバコネクタの
雌ネジ部と同一の特性をもつ雌ネジ部３０が適宜の長さ
にわたって形成されている。Further, in the left half portion, a female threaded portion 30 having the same characteristics as a female threaded portion of an optical fiber connector is formed on the inner surface over an appropriate length.
また、上記ホルダ２２内に設置されるフエルール２４は
、光伝送方向を長さ方向とする筒体であり、図における
右端部に雄ネジ部を有しており、該雄ネジ部が上記ホル
ダ２２の雌ネジ部３０と結合している。Further, the ferrule 24 installed in the holder 22 is a cylindrical body whose length direction is in the light transmission direction, and has a male threaded portion at the right end in the figure. It is connected to the female threaded portion 30 of.
第３図は、上記実施例の光固定減衰器２０を光ファイバ
コネクタ４とレセプタクル６との間に取り付けた状態を
示す断面図である。FIG. 3 is a sectional view showing a state in which the fixed optical attenuator 20 of the above embodiment is attached between the optical fiber connector 4 and the receptacle 6.
図示されるように、光固定減衰器２０のホルダ２２の雄
ネジ部２６が光ファイバコネクタ４の雌ネジ部と結合さ
れ、さらに該ホルダ２２と光ファイバコネクタ４とが突
き当てられて位置決めされている。ただし、このとき、
光減衰器、細径光ファイバ端面３４ａと光ファイバプラ
グ端面２ａとの距離が大きすぎると、減衰器に入射する
光の分布パターンにより光減衰量が変動するため、この
両者が衝突を起こさない程度まで、距離をつめる必要が
ある。As shown in the figure, the male threaded portion 26 of the holder 22 of the optical fixed attenuator 20 is coupled with the female threaded portion of the optical fiber connector 4, and the holder 22 and the optical fiber connector 4 are positioned in abutment against each other. There is. However, at this time,
If the distance between the optical attenuator, the small diameter optical fiber end face 34a, and the optical fiber plug end face 2a is too large, the amount of optical attenuation will vary depending on the distribution pattern of the light incident on the attenuator, so the distance between the two may not cause collision. We need to close the distance.
なお、本発明においては、フェルール内に挿入する１１
径のプラスチック光ファイバは、コアがＰＭＭＡ系の素
材からなるものであるのが最適であり、これは透光性等
に優れているからである。しかし、これに代えて、スチ
レン系、ポリカーボネート系等のいかなるプラスチック
光ファイバも適用可能である。In addition, in the present invention, 11 inserted into the ferrule
It is optimal for the plastic optical fiber to have a core made of a PMMA-based material because it has excellent light transmission properties. However, instead of this, any plastic optical fiber such as styrene-based or polycarbonate-based optical fiber can be used.
内径が０．６ｍｍの黄銅製フェルールを作製し、これに
径Ｑ、５ｍｍのプラスチック光ファイバ（三菱レイヨン
製、エスカ５Ｋ２００１）を挿入し、１８０℃で１０分
加熱した後、両端面を再度加熱により熔融鏡面仕上げを
した後、第２図に示す如きホルダに挿入して光固定減衰
器を作製した。これを、第３図に示すようにして、波長
６６０ ｎ ｍのＬＥＤ光源と径１ｍｍのプラスチック
光ファイバ（三菱レイヨン製、エスカ５Ｈ４００１）の
間に挿入した結果、５ｄＢの減衰量を得た。A brass ferrule with an inner diameter of 0.6 mm was made, a plastic optical fiber with a diameter Q of 5 mm (Mitsubishi Rayon, Esca 5K2001) was inserted into it, and after heating at 180°C for 10 minutes, both end faces were heated again. After molten and mirror-finished, it was inserted into a holder as shown in FIG. 2 to produce a fixed optical attenuator. This was inserted between an LED light source with a wavelength of 660 nm and a plastic optical fiber with a diameter of 1 mm (manufactured by Mitsubishi Rayon, Esca 5H4001) as shown in FIG. 3, resulting in an attenuation of 5 dB.
また、同様に、内径が０．３ ｍ ｍのフェルールを作
製し、これに径０．２５ｍｍのプラスチック光ファイバ
（三菱レイヨン製、エスカ５Ｋ１００１．）を挿入し、
同様の条件下に光固定減衰器を作製した。これを同様に
ＬＥＤと光ファイバ間に挿入した結果、１０ｄＢの減衰
量を得た。Similarly, a ferrule with an inner diameter of 0.3 mm was made, and a plastic optical fiber with a diameter of 0.25 mm (manufactured by Mitsubishi Rayon, Esca 5K1001.) was inserted into it.
An optical fixed attenuator was fabricated under similar conditions. When this was similarly inserted between the LED and the optical fiber, an attenuation of 10 dB was obtained.
以上説明したように、本発明の光固定減衰器によれば、
簡便な構造でしかも面単に所定のどんな減衰量をも実現
することができ、加えて該減衰器に入射する光の分布パ
ターンがいかなるものであっても、常に一定の減衰率を
得ることができる。As explained above, according to the optical fixed attenuator of the present invention,
It has a simple structure and can easily achieve any predetermined amount of attenuation, and in addition, no matter what the distribution pattern of light incident on the attenuator is, a constant attenuation rate can always be obtained. .
第１図は、本発明の光固定減衰器の製造プロセスを説明
する断面図である。
第２図は、本発明の光固定減衰器の一例を示す断面図で
ある。
第３図は、本発明による光固定減衰器を光ファイバコネ
クタとレセプタクルとの間に取りつけた状態を示す断面
図である。
第４〜６図は、従来の光減衰器の一例を示す断面図であ
る。
２・・・・・・光ファイバ、４・・・・・・光ファイバ
コネクタ、６・・・・・・レセプタクル、８・・・・・
・投光素子、１２・・・・・・光減衰手段、１５・・・
・・・スリーブ、１６．１６′・・・・・・レンズ、
１７．１７′・・・・・・フェルール、１８・・・・・
・円筒部材、１９・・・・・・電極、２０・・・・・・
光固定減衰器、２２・・・・・・ホルダ、２４・・・・
・・フェルール、３４・・・・・・光ファイバ。FIG. 1 is a sectional view illustrating the manufacturing process of the optical fixed attenuator of the present invention. FIG. 2 is a sectional view showing an example of the optical fixed attenuator of the present invention. FIG. 3 is a cross-sectional view showing a fixed optical attenuator according to the present invention installed between an optical fiber connector and a receptacle. 4 to 6 are cross-sectional views showing an example of a conventional optical attenuator. 2... Optical fiber, 4... Optical fiber connector, 6... Receptacle, 8...
- Light projecting element, 12... Light attenuation means, 15...
...Sleeve, 16.16'...Lens, 17.17'...Ferrule, 18...
・Cylindrical member, 19... Electrode, 20...
Optical fixed attenuator, 22...Holder, 24...
...Ferrule, 34...Optical fiber.
Claims (1)
した、該光ファイバ径より小さい内径をもつフェルール
内に該フェルール径より小径のプラスチック光ファイバ
を挿入し、加熱することにより光ファイバ径を増大させ
、該フェルール内径と同一としたことを特徴とする光固
定減衰器。1. A plastic optical fiber with a diameter smaller than the ferrule diameter is inserted into a ferrule that has an inner diameter smaller than the diameter of the optical fiber, which is determined according to the optical attenuation amount with respect to the diameter of the main optical fiber, and the optical fiber is heated. An optical fixed attenuator characterized in that the diameter is increased to be the same as the inner diameter of the ferrule.
Priority Applications (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63108943A JPH01279206A (en) | 1988-05-06 | 1988-05-06 | Light fixing attenuator |
| CA000598003A CA1330729C (en) | 1988-05-06 | 1989-04-27 | Light attenuator and process for fabrication thereof |
| KR1019890005990A KR930002626B1 (en) | 1988-05-06 | 1989-05-04 | Light attenuator and process for fabrication thereof |
| US07/347,030 US4925514A (en) | 1988-05-06 | 1989-05-04 | Light attenuator and process for fabrication thereof |
| DK223089A DK167551B1 (en) | 1988-05-06 | 1989-05-05 | PROCEDURE FOR MANUFACTURING NON-VARIABLE DIMENSIONS |
| EP89304552A EP0341919B1 (en) | 1988-05-06 | 1989-05-05 | Light attenuator and process for fabrication thereof |
| NO89891857A NO891857L (en) | 1988-05-06 | 1989-05-05 | LIGHT WEIGHTING DEVICE AND PROCEDURE FOR PREPARING SUCH A. |
| DE68914321T DE68914321T2 (en) | 1988-05-06 | 1989-05-05 | Light attenuator and process for its manufacture. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63108943A JPH01279206A (en) | 1988-05-06 | 1988-05-06 | Light fixing attenuator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01279206A true JPH01279206A (en) | 1989-11-09 |
Family
ID=14497581
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63108943A Pending JPH01279206A (en) | 1988-05-06 | 1988-05-06 | Light fixing attenuator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01279206A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002099486A1 (en) * | 2001-06-01 | 2002-12-12 | Adc Telecommunications, Inc. | Bulkhead adapter with optical fiber for signal attenuation |
| US6866425B2 (en) | 2003-02-14 | 2005-03-15 | Adc Telecommunications, Inc. | In-line optical device with removable housing and method |
-
1988
- 1988-05-06 JP JP63108943A patent/JPH01279206A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002099486A1 (en) * | 2001-06-01 | 2002-12-12 | Adc Telecommunications, Inc. | Bulkhead adapter with optical fiber for signal attenuation |
| US6712523B2 (en) | 2001-06-01 | 2004-03-30 | Adc Telecommunications, Inc. | Bulkhead adapter with optical fiber for signal attenuation |
| US6866425B2 (en) | 2003-02-14 | 2005-03-15 | Adc Telecommunications, Inc. | In-line optical device with removable housing and method |
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