JPS6231323B2 - - Google Patents
Info
- Publication number
- JPS6231323B2 JPS6231323B2 JP59038766A JP3876684A JPS6231323B2 JP S6231323 B2 JPS6231323 B2 JP S6231323B2 JP 59038766 A JP59038766 A JP 59038766A JP 3876684 A JP3876684 A JP 3876684A JP S6231323 B2 JPS6231323 B2 JP S6231323B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- diffraction grating
- wavelength
- input fiber
- diffracted 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.)
- Expired
Links
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
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29304—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating
- G02B6/29305—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating as bulk element, i.e. free space arrangement external to a light guide
- G02B6/2931—Diffractive element operating in reflection
-
- 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
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29346—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by wave or beam interference
- G02B6/29361—Interference filters, e.g. multilayer coatings, thin film filters, dichroic splitters or mirrors based on multilayers, WDM filters
-
- 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
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29379—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device
- G02B6/2938—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は光フアイバ用の分波器に係り、特に、
広い通過波長帯域幅を有して組立調整の容易な光
分波器に関するものである。[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a demultiplexer for optical fiber, and in particular,
The present invention relates to an optical demultiplexer that has a wide passing wavelength bandwidth and is easy to assemble and adjust.
光分波器は入射フアイバ中を伝搬する波長多重
光を複数の波長の波に分解してそれぞれ別の出射
フアイバに振り分けるもので、この種の波長多重
光フアイバ伝送に用いる光分波器として従来干渉
膜形光分波器と回折格子形光分波器が開発されて
いる。干渉膜形光分波器は中心波長、帯域幅が任
意に設計可能であるという利点を有するが、干渉
膜の形成に極めて高度の技術と多大の作業を要
し、また分波数に等しい干渉膜を組合わせる必要
があるため分波数の増大に伴つて製造が困難とな
る欠点があつた。一方、回折格子形分波器は１個
の回折格子で多数の分波が可能であるという利点
を有する反面、回折効率の高い波長帯域がブレー
ズ波長の近傍に限られており、広帯域化が困難で
あるという欠点があつた。この欠点を解決するた
めに従来、第１図の例に示すように、干渉膜と回
折格子を組合わせた構造が提案されている。第１
図において、１は入射フアイバ、２はコリメート
レンズ、３は干渉膜フイルタ、４及び５はそれぞ
れ回折格子、６―ａ，６―ｂ，６―ｃ，６―ｄは
それぞれ出射フアイバである。第１図の構造によ
れば、干渉膜フイルタ３で波長帯域を分離した後
に各波長帯域で高回折効率を有する回折格子４，
５を使用することにより広帯域な光分波器を構成
することが可能となる。
An optical demultiplexer separates wavelength-multiplexed light propagating through an input fiber into waves of multiple wavelengths and distributes them to separate output fibers. Interference film type optical demultiplexers and diffraction grating type optical demultiplexers have been developed. Interference film type optical demultiplexers have the advantage that the center wavelength and bandwidth can be designed arbitrarily, but forming the interference film requires extremely advanced technology and a great deal of work, and the interference film has the same number of demultiplexers. Since it is necessary to combine the two, there is a drawback that manufacturing becomes difficult as the number of demultiplexing waves increases. On the other hand, while a diffraction grating type demultiplexer has the advantage of being able to perform multiple demultiplexing with one diffraction grating, the wavelength band with high diffraction efficiency is limited to the vicinity of the blaze wavelength, making it difficult to widen the wavelength band. It had the disadvantage of being. In order to solve this drawback, a structure in which an interference film and a diffraction grating are combined has been proposed, as shown in the example of FIG. 1st
In the figure, 1 is an input fiber, 2 is a collimating lens, 3 is an interference film filter, 4 and 5 are each a diffraction grating, and 6-a, 6-b, 6-c, and 6-d are output fibers, respectively. According to the structure shown in FIG. 1, after the wavelength bands are separated by the interference film filter 3, the diffraction grating 4, which has high diffraction efficiency in each wavelength band,
By using 5, it becomes possible to construct a broadband optical demultiplexer.
しかし、第１図の構造においては、独立な２個
の回折格子を用いていることから、両回折格子を
所定の角度に設定するために極めて精密な角度調
整を必要とし、組立工程が複雑となることが避け
られない。 However, since the structure shown in Figure 1 uses two independent diffraction gratings, extremely precise angle adjustment is required to set both diffraction gratings at a predetermined angle, making the assembly process complicated. It is inevitable that it will happen.
本発明の目的は、従来技術での上記した不都合
を除き、複数の回折格子を用いて広波長帯域の回
折格子形分波器を構成する場合に、構造簡易で、
微細な角度調整を不要とし、組立工程を簡易化す
ることのできる光分波器を提供することにある。
An object of the present invention is to eliminate the above-mentioned disadvantages of the prior art, and to provide a simple structure when configuring a wide wavelength band diffraction grating type demultiplexer using a plurality of diffraction gratings.
It is an object of the present invention to provide an optical demultiplexer that does not require fine angle adjustment and can simplify the assembly process.
本発明の特徴は、上記目的を達成するために、
ブレーズ波長の異なる複数の回折格子を同一基板
面上に設置する構造とすること、及び、さらに広
波長帯域とするために、回折格子からの回折光の
結像位置近傍に複数個の直角プリズムをそれぞれ
一定間隔だけ離して配置して各通過波長帯域にわ
たる入射フアイバ実像により大きな反射面を有し
て入射してくる回折光を再び回折格子側に逆平行
に戻させる構成とすることにある。
In order to achieve the above object, the features of the present invention are as follows:
In order to have a structure in which multiple diffraction gratings with different blaze wavelengths are installed on the same substrate surface, and to achieve a wider wavelength band, multiple right-angle prisms are installed near the imaging position of the diffracted light from the diffraction grating. They are arranged at a fixed interval from each other, and have a larger reflecting surface than the real image of the incident fiber covering each passing wavelength band, so that the incident diffracted light is returned to the diffraction grating side in an antiparallel manner.
第２図は本発明の基本説明図であつて、回折格
子を２個とする場合である。第２図において、７
は入射フアイバ、８は分布屈折率形ロツドレン
ズ、９は台形プリズム、１０及び１１はそれぞれ
干渉膜フイルタ、１２は回折格子基板、１３及び
１４はそれぞれ回折格子、１５及び１６は三角プ
リズム、１７―ａ，１７―ｂ，１７―ｃ，１７―
ｄは出射フアイバである。
FIG. 2 is a basic explanatory diagram of the present invention, in which two diffraction gratings are used. In Figure 2, 7
8 is an input fiber, 8 is a distributed index rod lens, 9 is a trapezoidal prism, 10 and 11 are each an interference film filter, 12 is a diffraction grating substrate, 13 and 14 are each a diffraction grating, 15 and 16 are triangular prisms, 17-a , 17-b, 17-c, 17-
d is the exit fiber.
第２図において、入射フアイバ７はコア径が50
μｍ、外径が125μｍのGI（グレーテツド・イン
デツクス）形フアイバである。分布屈折率形ロツ
ドレンズ８は外径２mm、ピツチ0.25、焦点距離
4.2mmである。台形プリズム９及び三角プリズム
１５，１６は光学ガラス（BK7）より成り、プリ
ズム相互間の接触表面には、TiO2及びSiO2を多
層に蒸着して成る干渉膜フイルタ１０，１１が形
成されている。干渉膜フイルタ１０，１１の光学
特性は、波長1150nm以上を通過域とし、波長
950nm以下を阻止域とする長波長通過形である。
回折格子基板１２はシリコン単結晶であり、公知
の異方性エツチング技術によつて同一表面上に回
折格子１３及び１４が形成されている。回折格子
１３の格子ピツチは1.66μｍ、ブレーズ波長は
1157nmであり、回折格子１４の格子ピツチは
1.33μｍ、ブレーズ波長は928nmである。回折格
子１３，１４の法線方向は分布屈折率形ロツドレ
ンズ８の光軸方向に対して、ブレーズ角13度に等
しく、13度傾斜している。 In Figure 2, the input fiber 7 has a core diameter of 50 mm.
It is a GI (Graded Index) type fiber with an outer diameter of 125 μm. The distributed index rod lens 8 has an outer diameter of 2 mm, a pitch of 0.25, and a focal length of
It is 4.2mm. The trapezoidal prism 9 and the triangular prisms 15 and 16 are made of optical glass (BK7), and interference film filters 10 and 11 made of TiO 2 and SiO 2 deposited in multiple layers are formed on the contact surfaces between the prisms. . The optical characteristics of the interference film filters 10 and 11 are such that the wavelength is 1150 nm or more as a passband.
It is a long wavelength pass type with a stop band of 950 nm or less.
Diffraction grating substrate 12 is a silicon single crystal, and diffraction gratings 13 and 14 are formed on the same surface by a known anisotropic etching technique. The grating pitch of the diffraction grating 13 is 1.66 μm, and the blaze wavelength is
1157nm, and the grating pitch of the diffraction grating 14 is
The blaze wavelength is 1.33 μm and 928 nm. The normal direction of the diffraction gratings 13 and 14 is equal to the blaze angle of 13 degrees and is inclined by 13 degrees with respect to the optical axis direction of the distributed index rod lens 8.
分布屈折率形ロツドレンズ８の中心近傍に位置
する入射フアイバ７からの入射光は、波長が
1200nm及び1300nmの場合、回折格子１３で回折
され、入射光に対してそれぞれ0.968度及び3.275
度傾斜した回折光となつて焦点距離4.2mmの分布
屈折率形ロツドレンズ８を通過して入射フアイバ
７の端面中心からそれぞれ71μｍ及び239μｍ離
れた位置に設置した出射フアイバ１７―ａ，１７
―ｂの端面に結像する。入射光の波長が810nm、
890nmの場合には、同様に、回折格子１４で回折
され、入射フアイバ７の端面中心からそれぞれ−
78μｍ、−244μｍ離れた位置に設置した出射フア
イバ１７―ｃ，１７―ｄの端面に結像する。な
お、第２図において入射フアイバ７は、分布屈折
率形ロツドレンズ８の中心から紙面と垂直方向に
100μｍ離れた位置に設置してあるため、出射フ
アイバ１７―ａ，１７―ｂ，１７―ｃ，１７―ｄ
は紙面とは200μｍだけ垂直方向に離れている。 The incident light from the input fiber 7 located near the center of the distributed index rod lens 8 has a wavelength of
In the case of 1200nm and 1300nm, they are diffracted by the diffraction grating 13, and the angle of the incident light is 0.968 degrees and 3.275 degrees, respectively.
The diffracted light becomes tilted and passes through a distributed index rod lens 8 with a focal length of 4.2 mm, and exit fibers 17-a and 17 are installed at positions 71 μm and 239 μm away from the center of the end face of the input fiber 7, respectively.
- Image is formed on the end face of b. The wavelength of the incident light is 810nm,
In the case of 890 nm, it is similarly diffracted by the diffraction grating 14, and -
The images are formed on the end faces of the output fibers 17-c and 17-d, which are placed 78 μm and -244 μm apart. In FIG. 2, the input fiber 7 extends from the center of the gradient index rod lens 8 in a direction perpendicular to the plane of the paper.
Since they are installed 100 μm apart, the output fibers 17-a, 17-b, 17-c, 17-d
is vertically separated from the paper by 200 μm.
第２図によれば、同一基板面上に２つの回折格
子を設ける構造であることから、810nm、
890nm、1200nm、1300nmの各波長を高効率に回
折し、広帯域にわたる低損失の光分波特性を得る
ことが可能であり、しかも構造が簡単なため、組
立て調整が容易である。ただし、第２図構造で
は、各波長の通過帯域幅が充分でないという問題
が残る。この点をさらに改良するには、第２図構
造の出射フアイバの位置に、第３図に示すよう
に、直角プリズムを設けて回折格子からの回折光
を逆平行に戻して再び回折格子に導びき、得られ
る両回折光を、入射フアイバの端面近傍に設置し
た出射フアイバ端面にそれぞれ集束させることが
有効である。 According to Figure 2, since the structure has two diffraction gratings on the same substrate surface, 810 nm,
It is possible to diffract each wavelength of 890nm, 1200nm, and 1300nm with high efficiency and obtain optical demultiplexing characteristics with low loss over a wide band.Moreover, the simple structure makes it easy to assemble and adjust. However, the structure shown in FIG. 2 still has the problem that the passband width for each wavelength is insufficient. To further improve this point, as shown in Figure 3, a right angle prism is installed at the position of the output fiber of the structure shown in Figure 2, and the diffracted light from the diffraction grating is returned to antiparallel and guided back to the diffraction grating. It is effective to focus both of the resulting diffracted lights on the end face of an output fiber installed near the end face of the input fiber.
第３図において、１８は入射フアイバ、１９は
分布屈折率形ロツドレンズ、２０―ａ，２０―
ｂ，２０―ｃ，２０―ｄは直角プリズム、２１―
ａ，２１―ｂ，２１―ｃ，２１―ｄは出射フアイ
バ、２２は台形プリズム、２３及び２４は干渉膜
フイルタ、２５及び２６は三角プリズム、２７は
回折格子基板、２８及び２９は回折格子基板２７
の同一面上に設けられたブレーズ波長の異なる回
折格子である。なお、直角プリズムは反射光の変
位方向が回折格子主面と垂直となるように設定し
てある。 In FIG. 3, 18 is an input fiber, 19 is a distributed index rod lens, 20-a, 20-
b, 20-c, 20-d are right angle prisms, 21-
a, 21-b, 21-c, 21-d are output fibers, 22 is a trapezoidal prism, 23 and 24 are interference film filters, 25 and 26 are triangular prisms, 27 is a diffraction grating substrate, and 28 and 29 are diffraction grating substrates. 27
These are diffraction gratings with different blaze wavelengths provided on the same surface. Note that the right-angle prism is set so that the displacement direction of reflected light is perpendicular to the main surface of the diffraction grating.
第３図実施例の動作を、第４図に示した分布屈
折率形ロツドレンズ１９の端部拡大図を用いて説
明する。入射フアイバ１８から入射した波長
1200nmの光は回折格子２８で回折され、直角プ
リズム２０―ａに集光する。この光は、直角プリ
ズム２０―ａの寸法と結像位置で決まる距離だけ
回折格子主面と垂直に変位して回折格子２８に向
つて反射され、再び回折されて出射フアイバ２１
―ａに結像する。このとき中心波長が1200nmか
ら変動すれば、直角プリズム２０―ａの集光位置
は回折格子主面内で移動するが、その位置が直角
プリズム２０―ａの反射面内にあれば直角プリズ
ム２０―ａからの反射光は回折光とほぼ同一角度
で逆行するため、再回折された光は波長の変化に
かかわらず常に一定の角度を保ち、出射フアイバ
２１―ａに結像することになり、この結果、広い
通過波長帯域の特性を実現することが可能とな
る。同様に波長1300nm、810nm、890nmの入射
光はそれぞれ直角プリズム２０―ｂ，２０―ｃ，
２０―ｄを経由して出射フアイバ２１―ｂ，２１
―ｃ，２１―ｄに結像する。このようにして、第
３図実施例によれば、第２図で残された問題点を
解決し、各波長の通過帯域幅を充分に広いものと
することができる。 The operation of the embodiment shown in FIG. 3 will be explained using an enlarged view of the end portion of the distributed index rod lens 19 shown in FIG. Wavelength incident from input fiber 18
The 1200 nm light is diffracted by the diffraction grating 28 and focused on the right angle prism 20-a. This light is displaced perpendicularly to the main surface of the diffraction grating by a distance determined by the dimensions and imaging position of the right-angle prism 20-a, is reflected toward the diffraction grating 28, is diffracted again, and is directed to the output fiber 21.
-Focuses on a. At this time, if the center wavelength changes from 1200 nm, the focusing position of the right-angle prism 20-a moves within the main surface of the diffraction grating, but if the position is within the reflective surface of the right-angle prism 20-a, the right-angle prism 20-a moves. Since the reflected light from a goes backward at almost the same angle as the diffracted light, the re-diffracted light always maintains a constant angle regardless of the change in wavelength and is focused on the output fiber 21-a. As a result, it is possible to realize characteristics of a wide wavelength band. Similarly, incident light with wavelengths of 1300 nm, 810 nm, and 890 nm is transmitted through right angle prisms 20-b, 20-c, respectively.
Output fibers 21-b, 21 via 20-d
-c, imaged at 21-d. In this way, according to the embodiment of FIG. 3, the problems remaining in FIG. 2 can be solved and the passband width of each wavelength can be made sufficiently wide.
なお、上記第２図基本説明図及び第３図実施例
では、設置する回折格子の数を２個とする場合に
ついて説明したが、本発明では、さらに回折格子
の数を多くし、それに応じて干渉膜フイルタの個
数を多くしても、前述実施例の場合と同じ動作を
行なわせることができ、しかもその場合も同一基
板面上に複数の回折格子を設ける構造をそのまま
採用できることから、微細な角度調整を全く不要
とし、組立工程を極めて簡易化することができる
利点がある。 In addition, in the basic explanatory diagram in FIG. 2 and the embodiment in FIG. Even if the number of interference film filters is increased, the same operation as in the previous embodiment can be performed, and in this case, the structure in which multiple diffraction gratings are provided on the same substrate can be adopted as is, making it possible to There is an advantage that no angle adjustment is required at all, and the assembly process can be extremely simplified.
以上説明したように、本発明によれば、複数の
回折格子を用いて広波長帯域の回折格子形光分波
器を構成する場合に、回折格子間の微細な角度調
整が不要となり、組立工程が極めて容易となる。
As explained above, according to the present invention, when configuring a wide wavelength band diffraction grating type optical demultiplexer using a plurality of diffraction gratings, fine angle adjustment between the diffraction gratings becomes unnecessary, and the assembly process becomes extremely easy.
第１図は従来例の説明図、第２図は本発明の基
本説明図、第３図は本発明の一実施例図、第４図
は第３図における分布屈折率形ロツドレンズ１９
の端部拡大図である。
符号の説明、１，７，１８…入射フアイバ、２
…コリメートレンズ、３，１０，１１，２３，２
４…干渉膜フイルタ、４，５，１３，１４，２
８，２９…回折格子、６，１７，２１…出射フア
イバ、８，１９…分布屈折率形ロツドレンズ、
９，２２…台形プリズム、１２，２７…回折格子
基板、１５，１６，２５，２６…三角プリズム、
２０…直角プリズム。
FIG. 1 is an explanatory diagram of a conventional example, FIG. 2 is a basic explanatory diagram of the present invention, FIG. 3 is a diagram of an embodiment of the present invention, and FIG. 4 is a distributed index rod lens 19 in FIG. 3.
FIG. 2 is an enlarged view of the end. Explanation of symbols, 1, 7, 18...Input fiber, 2
...Collimating lens, 3, 10, 11, 23, 2
4...Interference film filter, 4, 5, 13, 14, 2
8, 29... Diffraction grating, 6, 17, 21... Output fiber, 8, 19... Gradient index rod lens,
9, 22... Trapezoidal prism, 12, 27... Diffraction grating substrate, 15, 16, 25, 26... Triangular prism,
20...Right angle prism.
Claims (1)
の波長の波に分解してそれぞれ別の出射フアイバ
に振り分ける光分波器において、入射光を平行光
束とするコリメートレンズと、特定波長帯域の光
を選択的に通過させる複数個の干渉膜フイルタ
と、同一基板面上に設けたブレーズ波長の異なる
複数の回折格子と、回折光の結像位置近傍にそれ
ぞれ一定間隔だけ離して配置されて各通過波長帯
域にわたる入射フアイバ実像より大きな反射面を
有して入射してくる回折光を逆平行に戻す複数個
の直角プリズムとを備え、入射フアイバからの入
射光を上記コリメートレンズ及び上記干渉膜フイ
ルタに順次通して波長帯域の異なる互いにほぼ平
行な複数光束に分離し各光束を上記回折格子にそ
れぞれ導びいて回折光とし、この回折光を上記直
角プリズムを介して再び上記回折格子に導びき、
得られる再回折光を入射フアイバの端面近傍に設
置した複数個の出射フアイバ端面にそれぞれ集束
させることを特徴とする光分波器。1. In an optical demultiplexer that separates wavelength-multiplexed light propagating through an input fiber into waves of multiple wavelengths and distributes them to separate output fibers, a collimating lens converts the input light into a parallel beam of light, and a collimator lens separates the light in a specific wavelength band. A plurality of interference film filters for selectively passing the light, a plurality of diffraction gratings with different blaze wavelengths provided on the same substrate surface, and a plurality of diffraction gratings arranged at a fixed interval near the imaging position of the diffracted light to detect each passing wavelength. A plurality of rectangular prisms having reflective surfaces larger than the real image of the input fiber over a band and returning the incident diffracted light to antiparallel directions are provided, and the incident light from the input fiber is sequentially transmitted to the collimating lens and the interference film filter. splitting the beam into a plurality of substantially parallel beams with different wavelength bands through the diffraction grating, guiding each beam to the diffraction grating to form diffracted light, and guiding this diffracted light to the diffraction grating again via the right angle prism,
An optical demultiplexer characterized in that the obtained re-diffracted light is focused on each of the end faces of a plurality of output fibers installed near the end face of an input fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3876684A JPS60184217A (en) | 1984-03-02 | 1984-03-02 | Optical demultiplexer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3876684A JPS60184217A (en) | 1984-03-02 | 1984-03-02 | Optical demultiplexer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60184217A JPS60184217A (en) | 1985-09-19 |
| JPS6231323B2 true JPS6231323B2 (en) | 1987-07-08 |
Family
ID=12534407
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3876684A Granted JPS60184217A (en) | 1984-03-02 | 1984-03-02 | Optical demultiplexer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60184217A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63285271A (en) * | 1987-05-15 | 1988-11-22 | Hitachi Ltd | power distribution rotor |
| JPH01103214U (en) * | 1987-12-28 | 1989-07-12 | ||
| JPH01103215U (en) * | 1987-12-28 | 1989-07-12 | ||
| JPH0284034A (en) * | 1988-06-13 | 1990-03-26 | Camco Inc | Oil charging type generator for submergible pump equipped with varnish not applied stator structure |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001037014A1 (en) * | 1999-11-12 | 2001-05-25 | Cme Telemetrix Inc. | Volume or stacked holographic diffraction gratings for wavelength division multiplexing and spectroscopy |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5723906A (en) * | 1980-07-21 | 1982-02-08 | Fujitsu Ltd | Broad-band optical branching filter |
-
1984
- 1984-03-02 JP JP3876684A patent/JPS60184217A/en active Granted
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63285271A (en) * | 1987-05-15 | 1988-11-22 | Hitachi Ltd | power distribution rotor |
| JPH01103214U (en) * | 1987-12-28 | 1989-07-12 | ||
| JPH01103215U (en) * | 1987-12-28 | 1989-07-12 | ||
| JPH0284034A (en) * | 1988-06-13 | 1990-03-26 | Camco Inc | Oil charging type generator for submergible pump equipped with varnish not applied stator structure |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60184217A (en) | 1985-09-19 |
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