JPS62201406A - Optical wavelength multiplexer/demultiplexer - Google Patents
Optical wavelength multiplexer/demultiplexerInfo
- Publication number
- JPS62201406A JPS62201406A JP1862786A JP1862786A JPS62201406A JP S62201406 A JPS62201406 A JP S62201406A JP 1862786 A JP1862786 A JP 1862786A JP 1862786 A JP1862786 A JP 1862786A JP S62201406 A JPS62201406 A JP S62201406A
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- Prior art keywords
- dispersion
- wavelength
- light
- diffraction grating
- output
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- 230000003287 optical effect Effects 0.000 title claims abstract description 25
- 239000006185 dispersion Substances 0.000 claims abstract description 41
- 239000013307 optical fiber Substances 0.000 claims abstract description 15
- 239000000835 fiber Substances 0.000 abstract description 11
- 230000005540 biological transmission Effects 0.000 abstract description 10
- 230000010287 polarization Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- PCTMTFRHKVHKIS-BMFZQQSSSA-N (1s,3r,4e,6e,8e,10e,12e,14e,16e,18s,19r,20r,21s,25r,27r,30r,31r,33s,35r,37s,38r)-3-[(2r,3s,4s,5s,6r)-4-amino-3,5-dihydroxy-6-methyloxan-2-yl]oxy-19,25,27,30,31,33,35,37-octahydroxy-18,20,21-trimethyl-23-oxo-22,39-dioxabicyclo[33.3.1]nonatriaconta-4,6,8,10 Chemical compound C1C=C2C[C@@H](OS(O)(=O)=O)CC[C@]2(C)[C@@H]2[C@@H]1[C@@H]1CC[C@H]([C@H](C)CCCC(C)C)[C@@]1(C)CC2.O[C@H]1[C@@H](N)[C@H](O)[C@@H](C)O[C@H]1O[C@H]1/C=C/C=C/C=C/C=C/C=C/C=C/C=C/[C@H](C)[C@@H](O)[C@@H](C)[C@H](C)OC(=O)C[C@H](O)C[C@H](O)CC[C@@H](O)[C@H](O)C[C@H](O)C[C@](O)(C[C@H](O)[C@H]2C(O)=O)O[C@H]2C1 PCTMTFRHKVHKIS-BMFZQQSSSA-N 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000003127 knee Anatomy 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
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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
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/1086—Beam splitting or combining systems operating by diffraction only
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/04—Prisms
-
- 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 Communication System (AREA)
- Diffracting Gratings Or Hologram Optical Elements (AREA)
Abstract
Description
【発明の詳細な説明】
〔概要〕
光路上の回折格子間に、分散分割プリズム、すなわち、
分散分割機能をもつ格子部を有するプリズムを設置した
、各波長チャネル内の透過帯域（バンド）幅の広い回折
格子型光波長合分波器を提起する。[Detailed Description of the Invention] [Summary] A dispersion splitting prism, that is,
We propose a diffraction grating type optical wavelength multiplexer/demultiplexer with a wide transmission band in each wavelength channel, which is equipped with a prism having a grating section with a dispersion splitting function.
本発明は光通信システムを構成する光波長合分波器に関
する。The present invention relates to an optical wavelength multiplexer/demultiplexer constituting an optical communication system.
波長多重通信は波長の異なる光（各波長チャネル）毎に
それぞれ別個の情報をのせ、それらを１つの光路に合成
し、光ファイバを通して伝送するという方法がとられて
いる。Wavelength multiplexing communication uses a method in which separate information is loaded on each light of a different wavelength (each wavelength channel), the information is combined into one optical path, and the information is transmitted through an optical fiber.
従って、受信側では合成された光を各波長チャネル毎に
分解し、それぞれの光に重畳されている情報を取り出す
必要がある。Therefore, on the receiving side, it is necessary to decompose the combined light into each wavelength channel and extract the information superimposed on each light.
このようなシステムにおいては、複数の波長の光を合成
したり、あるいは合成された光を波長別に分解するため
に光波長合分波器が用いられている。In such a system, an optical wavelength multiplexer/demultiplexer is used to combine light of a plurality of wavelengths or to separate the combined light into wavelengths.
以上のような波長多重光通信システムの構成においては
、光波長合分波器内の回折格子の波長分散に起因する狭
帯域化の問題を解決して、各波長チャネル内の透過帯域
幅を広くすることが重要である。In the configuration of the wavelength division multiplexing optical communication system as described above, the problem of band narrowing caused by the wavelength dispersion of the diffraction grating in the optical wavelength multiplexer/demultiplexer is solved, and the transmission bandwidth within each wavelength channel is widened. It is important to.
第２図は従来例の回折格子を用いた光波長合分波器の側
断面図である。FIG. 2 is a side sectional view of a conventional optical wavelength multiplexer/demultiplexer using a diffraction grating.
ここでは、説明の便宜上入出力関係は分波の場合につい
て説明する。Here, for convenience of explanation, the case where the input/output relationship is splitting will be described.
図において、入力用光ファイバ２１より入力された光は
、レンズ２４で平行光になり回折格子２２で反射される
。In the figure, light inputted from an input optical fiber 21 is turned into parallel light by a lens 24 and reflected by a diffraction grating 22.
回折格子２２によって波長分散された光は、レンズ２４
を透過することにより、それぞれの波長毎に設けられた
出力用光フアイバアレイ２３の各光ファイバの上に集光
し、ここより出力される。The light wavelength-dispersed by the diffraction grating 22 is transmitted to the lens 24
By transmitting the light, the light is focused onto each optical fiber of the output optical fiber array 23 provided for each wavelength, and is output from there.
それぞれの波長毎に設けられた出力用光ファイバが開口
している範囲は、出力用光フアイバアレイの各光ファイ
バの間隔に対して比較的狭く、出力用光ファイバに入る
光は、同一波長帯域にある光のごく狭い波長帯域の光に
なるという欠点がある。The opening range of the output optical fibers provided for each wavelength is relatively narrow compared to the spacing between the optical fibers of the output optical fiber array, and the light entering the output optical fibers is in the same wavelength band. The disadvantage is that it produces light in a very narrow wavelength band.
第１図は本発明による回折格子と分散分割プリズムを用
いた光波長合分波器の側断面図である。FIG. 1 is a side sectional view of an optical wavelength multiplexer/demultiplexer using a diffraction grating and a dispersion splitting prism according to the present invention.
図において、１は入出力ファイバ、２は回折格子、３は
分散分割プリズム、３Ｇは分散分割格子、４はレンズで
ある。In the figure, 1 is an input/output fiber, 2 is a diffraction grating, 3 is a dispersion splitting prism, 3G is a dispersion splitting grating, and 4 is a lens.
上記問題点の解決は、入力光ファイバから出力光ファイ
バに至る光路上に、４面体よりなり、かつその１面に階
段状に形成された格子を有する分散分割プリズム３が設
置されている本発明による光波長合分波器によって達成
される。The above-mentioned problem can be solved by the present invention, in which a dispersion splitting prism 3 is installed on the optical path from the input optical fiber to the output optical fiber, and the dispersion splitting prism 3 is made of a tetrahedron and has a grating formed in a stepwise manner on one surface of the tetrahedron. This is achieved by an optical wavelength multiplexer/demultiplexer.
以下本発明においても従来例と同様に、説明の便宜上入
出力関係は分波の場合について説明することにする。In the following, in the present invention, as in the conventional example, for convenience of explanation, the input/output relationship will be explained in the case of demultiplexing.
第３図は本発明の分散分割プリズムを説明する斜視図で
ある。FIG. 3 is a perspective view illustrating the dispersive splitting prism of the present invention.
図において、４面体ＡＢＣＤはつぎのように形成する。In the figure, the tetrahedron ABCD is formed as follows.
いま、直角座標ｘｙｚを考え、Ａを原点にし、ＡＢをＸ
軸、ＡＣをｙ軸、紙面に垂直に上向き方向を２軸とする
と、各面の方位は、
ＡＢＣｓ ｚ面、
ＡＢＤ ： （０、２−””、 ２−” ）。Now, consider rectangular coordinates xyz, with A as the origin and AB as X.
If the axis, AC is the y axis, and the upward direction perpendicular to the plane of the paper is the two axes, then the orientation of each plane is ABCs z plane, ABD: (0, 2-"", 2-").
ＡＣＤ ： （２−””、 ０ 、 ２−””
）。ACD: (2-””, 0, 2-””
).
ＢＣＤ ： （２−””、 ２−”、 ０
）。BCD: (2-””, 2-”, 0
).
になるように形成する。Form it so that it becomes.
このようなプリズムのＡＢＣ面に入出射する光の方位は
、
入射光： −２方向
出射光： ２方向
で、入射光はＡＣＤ面で反射し、ＢＣＤ面で反射し、Ａ
ＢＤ面で反射し、出射する。The directions of light entering and exiting from the ABC surface of such a prism are as follows: Incident light: -2 directions Output light: 2 directions; the incident light is reflected on the ACD surface, reflected on the BCD surface, and
It is reflected by the BD surface and emitted.
ここで、ＢＣＤ面には分散分割格子を設ける。Here, a dispersion dividing grating is provided on the BCD plane.
例えば、頂角６０°の階段状に形成された分散分割格子
の溝をＣＤに平行になるように設ければ、この格子への
入出射位置の方向は、
入射： −ｘ方向
のとき、
出射ニー×方向Ｘ分割数
となる。For example, if grooves of a dispersion dividing grating formed in a stepped shape with an apex angle of 60° are provided parallel to the CD, the directions of the input and output positions of the grating will be as follows: Incidence: When in the -x direction, Output Knee x direction x number of divisions.
このような条件の下に、分散分割プリズムの作用を要約
するとつぎのようになる。Under these conditions, the action of the dispersion splitting prism can be summarized as follows.
プリズムへの入射光はＡＣＤ面における最初の全反射で
進行方向を変え、ＢＣＤ面に形成された分散分割格子３
Ｇに入射する。ここからの反射光は再びＡＢＤ面におけ
る全反射により向きを変え、プリズムへの入射光とは反
対向きの出射光となる。The incident light on the prism changes its traveling direction by the first total reflection on the ACD surface, and then passes through the dispersion dividing grating 3 formed on the BCD surface.
incident on G. The reflected light from here changes direction again due to total reflection on the ABD surface, and becomes output light in the opposite direction to the incident light on the prism.
このとき、図中に示された方向の入射位置の連続的変化
は、分割された出射位置に変換される。At this time, the continuous change in the incident position in the direction shown in the figure is converted into divided output positions.
なお、プリズム内ではＳ偏光、Ｐ偏光各２回ずつ、計４
回の全反射が行われるため、偏光による反射の位相差は
相殺されて入出射時の偏光状態は保存される。In addition, inside the prism, S-polarized light and P-polarized light are transmitted twice each, for a total of 4 times.
Since total reflection is performed twice, the phase difference between reflections due to polarization is canceled out, and the polarization state at the time of input and output is preserved.
つぎに参考のために、本発明のプリズムに−例として形
成した、頂角 ６０″′の階段状に形成された分散分割
格子について説明する。Next, for reference, a dispersion dividing grating formed in a stepped shape with an apex angle of 60'', which is formed as an example in the prism of the present invention, will be described.
第４図は頂角６０°の階段状に形成された分散分割格子
の形状と機能を説明する斜視図である。FIG. 4 is a perspective view illustrating the shape and function of a dispersion dividing grid formed in a step-like manner with an apex angle of 60°.
図において、分散分割格子は直交座標ｘｙｚのｙ面に刻
まれた頂角６０°の階段状に形成された格子で、溝の斜
面Ｂに平行に、溝の斜面Ａに入射した光は、２度反射し
て、溝の斜面Ｂより溝の斜面Ａに平行に出射することが
できる。In the figure, the dispersion dividing grating is a step-shaped grating with an apex angle of 60° carved on the y plane of orthogonal coordinates xyz, and the light incident on the slope A of the groove parallel to the slope B of the groove is 2 The light can be reflected and emitted parallel to the slope A of the groove from the slope B of the groove.
なお、ｙ′、ｙ′の方位は、 ｙ′の方位 （２−””、 ２−””、 ０ ）。Note that the directions of y' and y' are Direction of y′ (2-””, 2-””, 0).
ｙ′の方位 （−２−１／ｌ、 ２−１／！、 ０
）。Direction of y' (-2-1/l, 2-1/!, 0
).
と決める。I decide.
いま、入射光をＫＩ、反射間の中間光をＫＭ、出射光を
Ｋ。とじ、Ｘ軸と溝の方向がＸ軸となす角をθとすると
、分散分割格子はつぎの限定条件を充たす必要がある。Now, the incident light is KI, the intermediate light between reflections is KM, and the output light is K. When the angle between the direction of the X-axis and the groove is θ, the dispersion dividing grating must satisfy the following limiting conditions.
（１） 格子を形成する面はｙ軸。(1) The plane forming the lattice is the y-axis.
（２）頂角が６０°の多数の溝を有する。(2) It has many grooves with an apex angle of 60°.
（３） θ＝ Ｔａｎ−’（２−””） ＃３５．３
’ 。(3) θ= Tan-'(2-"") #35.3
'.
（４）入射光に、の方位 （２伺／ｌ、 −２−＋／Ｚ
、 ｇ ）。(4) For the incident light, the azimuth (2K/l, -2-+/Z
, g).
（５１中間光に６の方位 （Ｑ 、０ ．１）。(51 intermediate light and 6 directions (Q, 0.1).
（６） 出射光に０の方位 （２−１／ｌ、 ２−
１／２． Ｏ）。(6) Zero direction for the emitted light (2-1/l, 2-
1/2. O).
上記の条件（２）、（３）と等価な表現をすると、つぎ
のようになる。The expression equivalent to the above conditions (2) and (3) is as follows.
（２１’ 、（３１’ 溝の斜面Ａ、 Ｂはそれぞれ
つぎの方位をもつ、すなわち、
斜面Ａの方位 （−２偵＋２−Ｚ ２−１／２ ）。(21', (31') Slopes A and B of the groove each have the following orientations, namely, the orientation of slope A (-2+2-Z 2-1/2).
斜面Ｂの方位 （２−’、２−’、−２−”” ）。Direction of slope B (2-', 2-', -2-'''').
となる。becomes.
ここで、各部の方位をまとめるとつぎのようになる７゜
Ｋｌ ： （２−”ｔ −２−””＋ ０
）＋ＫＮ：（Ｑ 、０ ．１）。Here, if we summarize the directions of each part, we get the following 7°Kl: (2-"t-2-""+0
)+KN: (Q, 0.1).
Ｋ（１： （２−””、 ２−”、 ０ ）。K (1: (2-””, 2-”, 0).
Ａ ： （−２−’ 、 ２−’ 、
２−””）。A: (-2-', 2-',
2-””).
Ｂ ： （２−’ 、 ２−’ 、−２−
””）。B: (2-', 2-', -2-
””).
以上の（１）〜（６）の限定条件を充たし、さらにつぎ
の条件を通用する。The above limiting conditions (1) to (6) are satisfied, and the following conditions also apply.
（７） 入射側回折格子の分散方向を２方向とする。(7) The dispersion directions of the incident side diffraction grating are two directions.
（８）分散分割格子上に集光する。(8) Focus the light onto the dispersive splitting grating.
このような条件の下に、分散分割格子の作用を要約する
とつぎのようになる。Under these conditions, the action of the dispersion splitting grid can be summarized as follows.
（１）出射側の分散方向は２方向に垂直となる。(1) The dispersion direction on the output side is perpendicular to the two directions.
すなわち、ｙ′方向である。That is, in the y' direction.
（２）分散分割格子における２度の反射とも入射角は４
５°となる。(2) The angle of incidence is 4 for both reflections on the dispersion splitting grating.
It becomes 5°.
（３）入射時の２方向偏光は、Ａ面でＰ偏光、Ｂ面でＳ
偏光となるために、出射時にはｙ′方向偏光となる。(3) Two-way polarization at the time of incidence is P polarization on the A plane and S polarization on the B plane.
Since the light is polarized, it becomes polarized in the y' direction when it is emitted.
（４）同様に、入射時のＸ′方向偏光は、出射時に２方
向偏光になる。(4) Similarly, the X'-direction polarized light upon incidence becomes bidirectionally polarized light upon exit.
（５） この分散分割格子への入射位置が図示のよう
に一２方向へ移動した場合、同一の溝に入射する範囲に
おいては出射位置がｙ′の方向へ移動する。(5) When the input position to this dispersion dividing grating moves in one of two directions as shown, the output position moves in the y' direction within the range where the light enters the same groove.
入射位置がさらに一２方向へ移動し、つぎの溝の領域に
入ると出射位置は不連続的に変化し、以下同様にして周
期的な動きを示す。When the incident position further moves in one or two directions and enters the next groove area, the output position changes discontinuously, and thereafter shows periodic movement in the same manner.
（６）なお、この分散分割格子は溝の深さ程度の誤差範
囲内でレンズの焦点面に置くことが可能である。(6) Note that this dispersion dividing grating can be placed on the focal plane of the lens within an error range of about the depth of the groove.
第５図（１１〜体）は本発明による光波長合分波器内の
各部における光の位置を示す図である。FIG. 5 (11-B) is a diagram showing the position of light in each part within the optical wavelength multiplexer/demultiplexer according to the present invention.
２度透過する回折格子を同一チャネル内において波長分
散を打ち消すように構成すれば、光ファイバよりの入射
時の１点が（第５図（１））、最初に通過する回折格子
で１方向に拡がり（第５図（２））、分散分割路プリズ
ムで波長チャネル毎に第５図（２）と異なる方向に分割
され、各チャネル内では第５図（２）と同じ方向に拡が
り（第５図（３））、つぎに第２回目に通過する回折格
子で波長チャネル毎に１点となって出力される（第５図
（４））。If a diffraction grating that passes twice is configured to cancel wavelength dispersion within the same channel, one point at the time of incidence from the optical fiber (Fig. 5 (1)) will be oriented in one direction by the diffraction grating that passes through it first. Spreading (Fig. 5 (2)), each wavelength channel is divided into a different direction as shown in Fig. 5 (2) by a dispersion splitting path prism, and within each channel, it is spread in the same direction as Fig. 5 (2). (3)), and then the diffraction grating that passes through it for the second time outputs one point for each wavelength channel ((4) in Figure 5).
このようにして波長チャネル内の波長依存性をなくすこ
とができる。In this way, wavelength dependence within the wavelength channel can be eliminated.
本発明の実施例を第１図に従って説明する。 An embodiment of the present invention will be described with reference to FIG.
第１図は本発明による回折格子と分散分割プリズムを用
いた光波長合分波器の側断面図である。FIG. 1 is a side sectional view of an optical wavelength multiplexer/demultiplexer using a diffraction grating and a dispersion splitting prism according to the present invention.
図において、１は入出力ファイバ、２は回折格子、３は
分散分割プリズム、３Ｇは分散分割格子、４はレンズで
ある。In the figure, 1 is an input/output fiber, 2 is a diffraction grating, 3 is a dispersion splitting prism, 3G is a dispersion splitting grating, and 4 is a lens.
レンズ４の一方の焦点面に入出力ファイバ１と分散分割
プリズム３が、他方の焦点面付近に回折格子２が配置さ
れる。The input/output fiber 1 and the dispersion splitting prism 3 are arranged at one focal plane of the lens 4, and the diffraction grating 2 is arranged near the other focal plane.
入力ファイバから入力した光は回折格子２で波長分散を
受け、分散分割プリズム３Ｇで波長チャネル毎に分割さ
られる。その光は再度回折格子２を通るが、このとき、
同一のチャネル内では分散が打ち消され、同一の出力フ
ァイバに結合する。Light input from the input fiber undergoes wavelength dispersion at the diffraction grating 2, and is split into wavelength channels by the dispersion splitting prism 3G. The light passes through the diffraction grating 2 again, but this time,
Dispersion is canceled within the same channel and coupled to the same output fiber.
また、異なる波長チャネルの光は他の位置の出力ファイ
バに結合する。Also, light of different wavelength channels is coupled to output fibers at other locations.
こ、のようにして透過帯域幅の拡大が行われる。The transmission bandwidth is expanded in this manner.
本発明は回折格子、レンズが各１つだけあればよく、分
散分割プ１）ズムの代わりに分散分割格子を用いた回折
格子型光波長合分波器が各２つずつ必要であるのに比べ
て、光学系が簡易化され、系の調節が極めて容易となる
。The present invention requires only one diffraction grating and one lens, and 1) requires two each of diffraction grating type optical wavelength multiplexers/demultiplexers using dispersion splitting gratings instead of dispersion splitting prisms. In comparison, the optical system is simplified and adjustment of the system is extremely easy.
第６図（１）、（２）はそれぞれ従来例と本発明による
光波長合分波器の損失と波長の関係を示゛す透過特性図
である。FIGS. 6(1) and 6(2) are transmission characteristic diagrams showing the relationship between loss and wavelength of the optical wavelength multiplexer/demultiplexer according to the conventional example and the present invention, respectively.
図において、Ｖ、Ｕ型の各曲線は各チャネルを示し、本
発明による第３図（２）は各チャネル毎の波長依存はＵ
型になり、透過帯域幅が広くなっていることが示されて
いる。In the figure, each V-shaped and U-shaped curve represents each channel, and FIG. 3 (2) according to the present invention shows that the wavelength dependence of each channel is U.
It has been shown that the transmission bandwidth has become wider.
以上の実施例においては、回折格子に反射型を用いたが
、これの代わりに透過型を用いても同様の効果が得られ
る。In the above embodiments, a reflection type diffraction grating is used, but the same effect can be obtained by using a transmission type instead.
以上詳細に説明したように本発明によれば、波長チャネ
ル内の透過帯域幅の広い光波長合分波器が得られる。As described above in detail, according to the present invention, an optical wavelength multiplexer/demultiplexer with a wide transmission band width within a wavelength channel can be obtained.
第１図は本発明による回折格子と分散分割プリズムを用
いた光波長合分波器の側断面図、第２図は従来例の回折
格子を用いた光波長合分波器の側断面図、
第３図は本発明の分散分割プリズムを説明する斜視図、
第４図は頂角６０°の階段状に形成された分散分割格子
の形状と機能を説明する斜視図、第５図（１）〜（４）
は本発明による光波長合分波器内の各部における光の位
置を示す図、
第６図（１）、（２）はそれぞれ従来例と本発明による
光波長合分波器の損失と波長の関係を示す透過特性図で
ある。
図において、
１は入出力ファイバ、
２は回折格子、
３は分散分割プリズム、
３Ｇは分散分割格子、
４はレンズ
末名杉しＰイｕＩぴＩＴ 白口ｑ
殖 １図
づし１ミプｔヨイシＡ（σ）Ａｕ″［ｌ≦ｒ１−ｅ−］
ｒ逼）第２ 回
Ｘ’、（−−０ン
／ｊ、Ｊ”ｌｊ。
１・（−π、汀Ｏ）
亮＋旧
（１） ・
で
ナニ
・
窃
＋発ｅＨのを全１痛°リシ光偽布置
矧ダ１〕
５Ｌ長 ヅ皮長
（り右εＡミ ｆｆｌ （ｚ）米
４５ Ｂ月Ｊ１ρＬ４ヂ１子王、 図
第６図FIG. 1 is a side sectional view of an optical wavelength multiplexer/demultiplexer using a diffraction grating and a dispersion splitting prism according to the present invention, and FIG. 2 is a side sectional view of an optical wavelength multiplexer/demultiplexer using a conventional diffraction grating. Fig. 3 is a perspective view illustrating the dispersion splitting prism of the present invention, Fig. 4 is a perspective view illustrating the shape and function of a dispersion splitting grating formed in a step shape with an apex angle of 60°, and Fig. 5 (1). ~(4)
6 is a diagram showing the position of light in each part in the optical wavelength multiplexer/demultiplexer according to the present invention, and FIGS. FIG. 3 is a transmission characteristic diagram showing the relationship. In the figure, 1 is an input/output fiber, 2 is a diffraction grating, 3 is a dispersion splitting prism, 3G is a dispersion splitting grating, 4 is a lens. A(σ)Au″[l≦r1−e−]
r〼) 2nd time Rishi light false placement 1] 5L length zu skin length (riright εAmi ffl (z) rice 45 B month J1ρL4ji1 child king, Figure 6
Claims (2)
に、 ４面体よりなり、かつその１面に階段状に形成された格
子を有する分散分割プリズムが設置されている ことを特徴とする光波長合分波器。(1) An optical wavelength characterized in that a dispersion splitting prism consisting of a tetrahedron and having a grating formed in a stepped manner on one surface is installed on the optical path from the input optical fiber to the output optical fiber. Multiplexer/demultiplexer.
ていることを特徴とする特許請求の範囲第１項記載の光
波長合分波器。(2) The optical wavelength multiplexer/demultiplexer according to claim 1, wherein the light entering and exiting the dispersion splitting prism is antiparallel.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1862786A JPS62201406A (en) | 1986-01-30 | 1986-01-30 | Optical wavelength multiplexer/demultiplexer |
| CA000528106A CA1280921C (en) | 1986-01-30 | 1987-01-26 | Optical wavelength compounding/dividing device |
| EP87101177A EP0231874B1 (en) | 1986-01-30 | 1987-01-28 | Optical wavelength compounding/dividing device |
| DE8787101177T DE3773687D1 (en) | 1986-01-30 | 1987-01-28 | OPTICAL WAVELENGTH MULTIPLEXER / -DEMULTIPLEXER. |
| US07/008,346 US4747655A (en) | 1986-01-30 | 1987-01-29 | Optical wavelength compounding/dividing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1862786A JPS62201406A (en) | 1986-01-30 | 1986-01-30 | Optical wavelength multiplexer/demultiplexer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62201406A true JPS62201406A (en) | 1987-09-05 |
| JPH0561607B2 JPH0561607B2 (en) | 1993-09-06 |
Family
ID=11976853
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1862786A Granted JPS62201406A (en) | 1986-01-30 | 1986-01-30 | Optical wavelength multiplexer/demultiplexer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62201406A (en) |
-
1986
- 1986-01-30 JP JP1862786A patent/JPS62201406A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0561607B2 (en) | 1993-09-06 |
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