JPH05203830A - Optical multiplexer demultiplexer - Google Patents
Optical multiplexer demultiplexerInfo
- Publication number
- JPH05203830A JPH05203830A JP1127592A JP1127592A JPH05203830A JP H05203830 A JPH05203830 A JP H05203830A JP 1127592 A JP1127592 A JP 1127592A JP 1127592 A JP1127592 A JP 1127592A JP H05203830 A JPH05203830 A JP H05203830A
- Authority
- JP
- Japan
- Prior art keywords
- optical
- film
- demultiplexing
- demultiplexer
- multiplexing
- 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.)
- Withdrawn
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- 230000003287 optical effect Effects 0.000 title claims abstract description 95
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- 230000001902 propagating effect Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000002834 transmittance Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000000644 propagated effect Effects 0.000 description 2
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- 239000004642 Polyimide Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
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- 230000002457 bidirectional effect Effects 0.000 description 1
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- 230000007423 decrease Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
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- 238000012827 research and development Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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Abstract
(57)【要約】
【目的】本発明は光合分波器に関し、波長多重数の増大
にかかわらず少ない数の光合分波膜で足りる低コスト化
に適した光合分波器の提供を目的とする。
【構成】湾曲平面上に形成された光合分波膜２６の異な
る位置を光が複数回透過するようにし、その透過光軸が
互いに平行になるようにして構成する。
(57) [Summary] [Object] The present invention relates to an optical multiplexer / demultiplexer, and an object thereof is to provide an optical multiplexer / demultiplexer suitable for cost reduction that requires a small number of optical multiplexing / demultiplexing films regardless of an increase in the number of wavelength division multiplexes. To do. [Structure] Light is transmitted through different positions of an optical multiplexing / demultiplexing film 26 formed on a curved plane a plurality of times, and the transmission optical axes thereof are parallel to each other.
Description
【０００１】[0001]
【産業上の利用分野】本発明は光合分波器に関する。近
年、光通信システムを加入者系に適用するための研究及
び開発が実用化レベルで行われている。加入者系におい
て波長分割多重を利用した双方向光通信を実現するため
には、異なる波長の光信号を分岐し或いは合流するため
の光合分波器が必要不可欠であり、この光合分波器の量
産技術の確立が、加入者系光通信システムを実用化する
上でのキーテクノロジーの一つとなっている。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical multiplexer / demultiplexer. In recent years, research and development for applying an optical communication system to a subscriber system have been carried out at a practical level. In order to realize bidirectional optical communication using wavelength division multiplexing in the subscriber system, an optical multiplexer / demultiplexer for branching or joining optical signals of different wavelengths is indispensable. Establishing mass-production technology is one of the key technologies for the practical application of subscriber optical communication systems.
【０００２】[0002]
【従来の技術】従来、波長多重数に応じた数の、波長特
性が異なる複数の光合分波膜を備えた光合分波器が知ら
れている。その具体例を図４により説明する。2. Description of the Related Art Conventionally, there is known an optical multiplexer / demultiplexer provided with a plurality of optical multiplexer / demultiplexers having different wavelength characteristics according to the number of wavelength division multiplexing. A specific example will be described with reference to FIG.
【０００３】この光合分波器は、波長が異なる３つの光
を分波するために、波長特性（透過率と波長の関係を表
す特性）が異なる３つの光合分波膜２，４，６を備えて
いる。光合分波膜２，４，６はその波長特性を図４
（Ｂ）に示すように、それぞれ波長λ1 ，λ2 ，λ3 の
光をよく透過させ、透過波長以外の波長の光は反射させ
る。This optical multiplexer / demultiplexer includes three optical multiplexer / demultiplexer films 2, 4 and 6 having different wavelength characteristics (characteristics showing the relationship between transmittance and wavelength) in order to demultiplex three lights having different wavelengths. I have it. The wavelength characteristics of the optical multiplexing / demultiplexing films 2, 4 and 6 are shown in FIG.
As shown in (B), light having wavelengths λ 1 , λ 2 , and λ 3 is well transmitted, and light having a wavelength other than the transmitted wavelength is reflected.
【０００４】いま、図４（Ａ）に示した構成において、
入力ポート８から波長λ1 ，λ2 ，λ3 の波長多重光が
入射すると、これらのうち波長λ1 の光は、光合分波膜
２を透過して第１出力ポート１０から出力される。光合
分波膜２で反射した光は、さらに反射膜１２で全反射し
て光合分波膜４に入射する。ここでは、波長λ2 の光が
光合分波膜４を透過して、第２出力ポート１４に至る。
そして、光合分波膜４で反射した光は、さらに反射膜１
６で反射して、光合分波膜６に入射し、ここでは波長λ
3 の光が光合分波膜６を透過して第３出力ポート１８に
至る。Now, in the configuration shown in FIG.
When wavelength-multiplexed light of wavelengths λ 1 , λ 2 , and λ 3 enters from the input port 8, the light of wavelength λ 1 among these is transmitted through the optical multiplexing / demultiplexing film 2 and output from the first output port 10. The light reflected by the optical multiplexing / demultiplexing film 2 is further totally reflected by the reflecting film 12 and enters the optical multiplexing / demultiplexing film 4. Here, light of wavelength λ 2 passes through the optical multiplexing / demultiplexing film 4 and reaches the second output port 14.
The light reflected by the optical multiplexing / demultiplexing film 4 is further reflected by the reflecting film 1.
It is reflected by 6 and is incident on the optical multiplexing / demultiplexing film 6, where the wavelength λ
The light 3 passes through the optical multiplexing / demultiplexing film 6 and reaches the third output port 18.
【０００５】[0005]
【発明が解決しようとする課題】このように、従来技術
による場合、波長多重数に応じた数の、波長特性が異な
る複数の光合分波膜が必要になるので、波長多重数が増
大するのに従って製造コストが著しく増大するという問
題があった。As described above, according to the prior art, since a plurality of optical multiplexing / demultiplexing films having different wavelength characteristics corresponding to the number of wavelength division multiplexing are required, the number of wavelength division multiplexing increases. Therefore, there is a problem that the manufacturing cost increases remarkably.
【０００６】本発明はこのような事情に鑑みて創作され
たもので、波長多重数の増大に従って製造コストが著し
く増大することのない光合分波器の提供を目的としてい
る。The present invention was created in view of the above circumstances, and an object thereof is to provide an optical multiplexer / demultiplexer in which the manufacturing cost does not significantly increase as the number of wavelength division multiplexes increases.
【０００７】[0007]
【課題を解決するための手段】本発明によると、湾曲平
面上に形成された光合分波膜の異なる位置を光が複数回
透過するようにし、その透過光軸が互いに平行になるよ
うにした光合分波器が提供される。According to the present invention, light is transmitted a plurality of times through different positions of an optical multiplexing / demultiplexing film formed on a curved plane, and the transmitted optical axes thereof are parallel to each other. An optical multiplexer / demultiplexer is provided.
【０００８】[0008]
【作用】互いに平行な透過光軸が、湾曲している光合分
波膜に交差するように設定されていると、各交差点にお
ける光合分波膜に対する入射角は異なるものとなる。一
方、光合分波膜に対する入射角が異なると、異なる波長
特性が得られる。When the transmission optical axes parallel to each other are set so as to intersect the curved optical multiplexing / demultiplexing film, the incident angles to the optical multiplexing / demultiplexing film at the respective intersections are different. On the other hand, if the incident angles to the optical multiplexing / demultiplexing film are different, different wavelength characteristics are obtained.
【０００９】従って、湾曲平面上に形成された光合分波
膜の異なる位置を光が複数回透過するようにし、その透
過光軸が互いに平行になるようにしておくことによっ
て、１つの光合分波膜で複数の波長特性を得ることがで
き、従来技術の問題点が解決される。Therefore, light is transmitted through different positions of the optical multiplexing / demultiplexing film formed on the curved plane a plurality of times, and the transmission optical axes thereof are set to be parallel to each other. The film can obtain a plurality of wavelength characteristics, and solves the problems of the prior art.
【００１０】また、本発明によると、各透過光軸が互い
に平行になるようにしているので、分波された光を出力
ポートにおいて光ファイバに結合するのが容易である。Further, according to the present invention, since the transmission optical axes are made parallel to each other, it is easy to couple the demultiplexed light into the optical fiber at the output port.
【００１１】[0011]
【実施例】以下本発明の実施例を説明する。図１は本発
明の第１実施例を示す光合分波器の平面図である。この
例では、導波路基板２２上に各光導波路を形成し、各光
導波路が光合分波膜に交差するようにしている。EXAMPLES Examples of the present invention will be described below. FIG. 1 is a plan view of an optical multiplexer / demultiplexer showing a first embodiment of the present invention. In this example, each optical waveguide is formed on the waveguide substrate 22 so that each optical waveguide intersects the optical multiplexing / demultiplexing film.
【００１２】導波路基板２２上には、湾曲した形状で一
定の幅の溝２２Ａが紙面と垂直な方向に形成されてお
り、この溝２２Ａの内部に光合分波膜が配置されてい
る。光合分波膜は、ポリイミド等からなる可撓性フィル
ム２４上に形成された誘電体多層膜２６からなり、これ
ら可撓性フィルム２４及び誘電体多層膜２６は、溝２２
Ａの形状に沿って、光学接着剤等を用いて溝２２Ａ内に
埋め込まれている。A groove 22A having a curved shape and a constant width is formed on the waveguide substrate 22 in a direction perpendicular to the paper surface, and an optical multiplexing / demultiplexing film is arranged inside the groove 22A. The optical multiplexing / demultiplexing film is composed of a dielectric multilayer film 26 formed on a flexible film 24 made of polyimide or the like. The flexible film 24 and the dielectric multilayer film 26 are formed in the groove 22.
The groove 22A is embedded along the shape of A using an optical adhesive or the like.
【００１３】導波路基板２２上にはまた、光導波路２８
（２８Ａ，２８Ｂ），３０（３０Ａ，３０Ｂ）及び３２
（３２Ａ，３２Ｂ）が互いに平行に且つそれぞれが溝２
２Ａと交差するように形成されている。光導波路２８Ａ
の基板縁部側の端部は入力側の光ファイバ４０に光結合
され、光導波路２８Ｂ，３０Ｂ及び３２Ｂの基板縁部側
の端部は、それぞれ出力側の光ファイバ４２，４４，４
６に光結合されている。An optical waveguide 28 is also provided on the waveguide substrate 22.
(28A, 28B), 30 (30A, 30B) and 32
(32A, 32B) are parallel to each other and each is groove 2
It is formed so as to intersect with 2A. Optical waveguide 28A
Of the optical waveguides 28B, 30B and 32B are respectively connected to the optical fibers 42, 44 and 4 on the output side.
Optically coupled to 6.
【００１４】光導波路２８Ａの伝搬光のうち誘電体多層
膜２６での反射成分を反射膜３４で反射させて光導波路
３０Ａに入射させるために、光導波路３６が形成されて
いる。また、光導波路３０Ａの伝搬光のうち誘電体多層
膜２６での反射成分を反射膜３８で反射させて光導波路
３２Ａに入射させるために、光導波路４０が形成されて
いる。An optical waveguide 36 is formed in order to reflect the reflected component of the dielectric multilayer film 26 of the propagated light of the optical waveguide 28A by the reflective film 34 and make it enter the optical waveguide 30A. Further, an optical waveguide 40 is formed in order to reflect the reflected component of the dielectric multilayer film 26 of the propagating light of the optical waveguide 30A by the reflective film 38 and make it enter the optical waveguide 32A.
【００１５】図２は図１の第１実施例における動作原理
を説明するための図である。図２（Ａ）は、誘電体多層
膜２６にある入射角度で光を入射させたときの透過率と
波長の関係を表すグラフである。中心波長λC で透過率
が最大となるような波長特性が得られている。FIG. 2 is a diagram for explaining the operation principle in the first embodiment of FIG. FIG. 2A is a graph showing the relationship between the transmittance and the wavelength when light is incident on the dielectric multilayer film 26 at an incident angle. The wavelength characteristics are obtained such that the transmittance becomes maximum at the center wavelength λ C.
【００１６】図２（Ｂ）は上述の中心波長λC と誘電体
多層膜２６への入射角の関係を表すグラフである。入射
角が増大するに従って、中心波長λC がある特定な関数
関係をもって減少していることがわかる。この実施例で
は、単位入射角変化に対する中心波長λC の変化は、１
５００ｎｍ帯の光に対して２〜３ｎｍ／度であった。FIG. 2B is a graph showing the relationship between the central wavelength λ C and the angle of incidence on the dielectric multilayer film 26 described above. It can be seen that the center wavelength λ C decreases with a certain functional relationship as the incident angle increases. In this embodiment, the change of the central wavelength λ C with respect to the change of the unit incident angle is 1
It was 2-3 nm / degree for light in the 500 nm band.
【００１７】この実施例では、図１に示すように、光導
波路２８の伝搬光の誘電体多層膜２６に対する入射角よ
りも光導波路３０の伝搬光の入射角の方が大きく、ま
た、光導波路３０の伝搬光の入射角よりも光導波路３２
の伝搬光の入射角の方が大きくなるように、溝２２Ａの
形状が特定されている。In this embodiment, as shown in FIG. 1, the incident angle of the propagating light in the optical waveguide 30 is larger than the incident angle of the propagating light in the optical waveguide 28 with respect to the dielectric multilayer film 26. The optical waveguide 32 than the incident angle of the propagating light of 30
The shape of the groove 22A is specified such that the incident angle of the propagating light is larger.
【００１８】このような条件の下で、入力側の光ファイ
バ４０から光導波路２８Ａに波長λ 1 ，λ2 ，λ3 （λ
3 ＜λ2 ＜λ1 ）の波長多重光が入射すると、波長λ1
の光は誘電体多層膜２６及び可撓性フィルム２４を透過
して光導波路２８Ｂを介して出力側の光ファイバ４２に
入射する。Under such conditions, the optical fiber on the input side is
Wavelength λ from the optical fiber 40A to the optical waveguide 28A 1, Λ2, Λ3(Λ
3<Λ2<Λ1), The wavelength λ1
Light is transmitted through the dielectric multilayer film 26 and the flexible film 24.
To the optical fiber 42 on the output side via the optical waveguide 28B.
Incident.
【００１９】光導波路２８Ａの伝搬光のうち、誘電体多
層膜２６での反射成分は、光導波路３６、反射膜３４及
び光導波路３０Ａをこの順に介して、より大きな入射角
で誘電体多層膜２６に入射する。ここでは、波長λ2 の
光が誘電体多層膜２６及び可撓性フィルム２４を透過し
て光導波路３０Ｂを介して出力側の光ファイバ４４に入
射する。Of the light propagated through the optical waveguide 28A, the reflection component at the dielectric multilayer film 26 passes through the optical waveguide 36, the reflective film 34, and the optical waveguide 30A in this order, and at a larger incident angle, the dielectric multilayer film 26. Incident on. Here, the light of wavelength λ 2 is transmitted through the dielectric multilayer film 26 and the flexible film 24 and is incident on the optical fiber 44 on the output side via the optical waveguide 30B.
【００２０】光導波路３０Ａの伝搬光のうち誘電体多層
膜２６での反射成分は、光導波路４０、反射膜３８及び
光導波路３２Ａを介して、さらにより大きな入射角で誘
電体多層膜２６に入射する。ここでは、波長λ3 の光が
誘電体多層膜２６及び可撓性フィルム２４を透過して光
導波路３２Ｂを介して出力側の光ファイバ４６に入射す
る。The reflected component of the propagation light of the optical waveguide 30A at the dielectric multilayer film 26 is incident on the dielectric multilayer film 26 at a larger incident angle via the optical waveguide 40, the reflection film 38 and the optical waveguide 32A. To do. Here, the light of wavelength λ 3 is transmitted through the dielectric multilayer film 26 and the flexible film 24 and is incident on the optical fiber 46 on the output side via the optical waveguide 32B.
【００２１】このように、本実施例においては、１つの
光合分波膜を用いて複数の波長特性を得るようにしてい
るので、波長多重数の増大にかかわらず光合分波膜の数
が少なくて済み、製造コストの低減が達成される。ま
た、本実施例においては、光合分波膜として、可撓性フ
ィルム２４上に形成された誘電体多層膜２６を用いてい
るので、光合分波膜を湾曲させるのが容易である。As described above, in this embodiment, since a plurality of wavelength characteristics are obtained by using one optical multiplexing / demultiplexing film, the number of optical multiplexing / demultiplexing films is small despite the increase in the number of wavelength multiplexing. And the manufacturing cost is reduced. Further, in this embodiment, since the dielectric multilayer film 26 formed on the flexible film 24 is used as the optical multiplexing / demultiplexing film, it is easy to bend the optical multiplexing / demultiplexing film.
【００２２】尚、反射膜３４，３８は光導波路の端面に
金や銅等の金属を蒸着することにより形成することがで
きる。また、所要形状の溝２２Ａについては、周知のエ
ッチング技術により形成することができる。The reflection films 34 and 38 can be formed by depositing a metal such as gold or copper on the end face of the optical waveguide. The groove 22A having a required shape can be formed by a known etching technique.
【００２３】さらに、この実施例においては、光合分波
器の分波機能についてのみ説明したが、構成的には同じ
ものを用いて、出力側の光ファイバを入力側の光ファイ
バとして、光合波機能も達成される。Further, in this embodiment, only the demultiplexing function of the optical multiplexer / demultiplexer has been described. However, the same configuration is used, and the optical fiber on the output side is used as the optical fiber on the input side. The function is also achieved.
【００２４】図３は本発明の第２実施例を示す光合分波
器の構成図である。この実施例が第１実施例と異なる点
は、光導波路に代えて空間光ビーム系を形成している点
と、出力側の光ファイバに代えて受光器を設けている点
である。FIG. 3 is a block diagram of an optical multiplexer / demultiplexer showing a second embodiment of the present invention. This embodiment differs from the first embodiment in that a spatial light beam system is formed instead of the optical waveguide, and that a photodetector is provided instead of the output side optical fiber.
【００２５】入力側の光ファイバ４８から放射された光
は、レンズ５０によってコリメートされ、誘電体多層膜
２６に入射する。誘電体多層膜２６を透過した３つの光
は、それぞれレンズ５２，５４，５６で集束されて、そ
れぞれ受光器５８，６０，６２に入射する。６４，６６
はミラーであり、それぞれ第１実施例における反射膜３
４，３８に対応している。The light emitted from the optical fiber 48 on the input side is collimated by the lens 50 and enters the dielectric multilayer film 26. The three lights that have passed through the dielectric multilayer film 26 are focused by the lenses 52, 54, and 56, and enter the photodetectors 58, 60, and 62, respectively. 64, 66
Are mirrors, each of which is the reflection film 3 in the first embodiment.
It corresponds to 4,38.
【００２６】このような構成によっても、第１実施例に
おけるのと同様な光分波機能が達成される。尚、受光器
５８，６０，６２の全部又は一部を半導体レーザ等の発
光素子に変えることによって、光合波機能もなされる。With such a structure, the same optical demultiplexing function as in the first embodiment can be achieved. An optical multiplexing function is also achieved by replacing all or part of the light receivers 58, 60, 62 with light emitting elements such as semiconductor lasers.
【００２７】以上説明した実施例においては、帯域通過
特性を有する光合分波膜を用いたが、長波長域通過特性
を有する光合分波膜或いは短波長域通過特性を有する光
合分波膜を用いて本発明を実施することもできる。In the embodiment described above, the optical multiplexing / demultiplexing film having the bandpass characteristic is used, but the optical multiplexing / demultiplexing film having the long wavelength band passing characteristic or the optical multiplexing / demultiplexing film having the short wavelength band passing characteristic is used. The present invention can also be implemented.
【００２８】[0028]
【発明の効果】以上説明したように、本発明によると、
波長多重数の増大にかかわらず１つ又は少ない数の光合
分波膜で足りる光合分波器の提供が可能になり、光合分
波器の低コスト化が可能になるという効果を奏する。As described above, according to the present invention,
It is possible to provide an optical multiplexer / demultiplexer that requires only one or a small number of optical multiplexer / demultiplexers regardless of an increase in the number of wavelength division multiplexing, and it is possible to reduce the cost of the optical multiplexer / demultiplexer.
【図１】本発明の第１実施例を示す光合分波器の平面図
である。FIG. 1 is a plan view of an optical multiplexer / demultiplexer showing a first embodiment of the present invention.
【図２】図１の光合分波器の動作原理の説明図である。2 is an explanatory diagram of an operation principle of the optical multiplexer / demultiplexer of FIG.
【図３】本発明の第２実施例を示す光合分波器の構成図
である。FIG. 3 is a configuration diagram of an optical multiplexer / demultiplexer showing a second embodiment of the present invention.
【図４】従来技術の説明図である。FIG. 4 is an explanatory diagram of a conventional technique.
２２ 導波路基板 ２２Ａ 溝 ２４ 可撓性フィルム ２６ 誘電体多層膜（光合分波膜） 22 Waveguide substrate 22A Groove 24 Flexible film 26 Dielectric multilayer film (optical multiplexing / demultiplexing film)
Claims (3)
の異なる位置を光が複数回透過するようにし、その透過
光軸が互いに平行になるようにしたことを特徴とする光
合分波器。1. An optical multiplexing / demultiplexing film (26) formed on a curved plane.
The optical multiplexer / demultiplexer is characterized in that light is transmitted through different positions of a plurality of times so that the transmission optical axes thereof are parallel to each other.
に形成された誘電体多層膜(26)からなり、該可撓性フィ
ルム及び誘電体多層膜は導波路基板(22)の湾曲溝(22A)
内に収容され、各光導波路は上記湾曲溝と交差するよう
に形成されていることを特徴とする請求項１に記載の光
合分波器。2. The optical multiplexing / demultiplexing film comprises a dielectric multilayer film (26) formed on a flexible film (24), and the flexible film and the dielectric multilayer film are waveguide substrates (22). Curved groove (22A)
The optical multiplexer / demultiplexer according to claim 1, wherein the optical waveguide is housed inside and each optical waveguide is formed so as to intersect with the curved groove.
に形成された誘電体多層膜(26)からなり、該可撓性フィ
ルム及び誘電体多層膜は各空間光ビームと交差するよう
に配置されていることを特徴とする請求項１に記載の光
合分波器。3. The optical multiplexing / demultiplexing film comprises a dielectric multilayer film (26) formed on a flexible film (24), the flexible film and the dielectric multilayer film intersecting each spatial light beam. The optical multiplexer / demultiplexer according to claim 1, wherein the optical multiplexer / demultiplexer is arranged as follows.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1127592A JPH05203830A (en) | 1992-01-24 | 1992-01-24 | Optical multiplexer demultiplexer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1127592A JPH05203830A (en) | 1992-01-24 | 1992-01-24 | Optical multiplexer demultiplexer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05203830A true JPH05203830A (en) | 1993-08-13 |
Family
ID=11773435
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1127592A Withdrawn JPH05203830A (en) | 1992-01-24 | 1992-01-24 | Optical multiplexer demultiplexer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05203830A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004057397A1 (en) * | 2002-12-20 | 2004-07-08 | Ngk Insulators, Ltd. | Optical device |
| US6775439B2 (en) * | 2001-11-20 | 2004-08-10 | Hitachi, Ltd. | Optical circuit device and optical transceiver |
| JP2006520924A (en) * | 2003-03-22 | 2006-09-14 | キネテイツク・リミテツド | Optical wavelength division multiplexing / demultiplexing equipment |
| US7123798B2 (en) | 2002-03-29 | 2006-10-17 | Ngk Insulators, Ltd. | Optical device and method of producing the same |
| US7195402B2 (en) | 2002-12-20 | 2007-03-27 | Ngk Insulators, Ltd. | Optical device |
| US7308174B2 (en) | 2002-12-20 | 2007-12-11 | Ngk Insulators, Ltd. | Optical device including a filter member for dividing a portion of signal light |
| US7321703B2 (en) | 2002-12-20 | 2008-01-22 | Ngk Insulators, Ltd. | Optical device |
| US7324729B2 (en) | 2003-06-02 | 2008-01-29 | Ngk Insulators, Ltd. | Optical device |
-
1992
- 1992-01-24 JP JP1127592A patent/JPH05203830A/en not_active Withdrawn
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6775439B2 (en) * | 2001-11-20 | 2004-08-10 | Hitachi, Ltd. | Optical circuit device and optical transceiver |
| US7123798B2 (en) | 2002-03-29 | 2006-10-17 | Ngk Insulators, Ltd. | Optical device and method of producing the same |
| WO2004057397A1 (en) * | 2002-12-20 | 2004-07-08 | Ngk Insulators, Ltd. | Optical device |
| US7195402B2 (en) | 2002-12-20 | 2007-03-27 | Ngk Insulators, Ltd. | Optical device |
| US7308174B2 (en) | 2002-12-20 | 2007-12-11 | Ngk Insulators, Ltd. | Optical device including a filter member for dividing a portion of signal light |
| US7321703B2 (en) | 2002-12-20 | 2008-01-22 | Ngk Insulators, Ltd. | Optical device |
| JP2006520924A (en) * | 2003-03-22 | 2006-09-14 | キネテイツク・リミテツド | Optical wavelength division multiplexing / demultiplexing equipment |
| US7324729B2 (en) | 2003-06-02 | 2008-01-29 | Ngk Insulators, Ltd. | Optical device |
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Legal Events
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| A300 | Withdrawal of application because of no request for examination |
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