JP2000105313A - Dispersion compensator - Google Patents
Dispersion compensatorInfo
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- JP2000105313A JP2000105313A JP10277473A JP27747398A JP2000105313A JP 2000105313 A JP2000105313 A JP 2000105313A JP 10277473 A JP10277473 A JP 10277473A JP 27747398 A JP27747398 A JP 27747398A JP 2000105313 A JP2000105313 A JP 2000105313A
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- dispersion
- refractive index
- dispersion compensator
- index material
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、光ファイバに短
光パルスを伝送させたときに生じる３次分散（群速度分
散の波長依存性）を補償するための分散補償器に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dispersion compensator for compensating for third-order dispersion (wavelength dependence of group velocity dispersion) generated when a short optical pulse is transmitted through an optical fiber.
【０００２】[0002]
【従来の技術】ピコ秒〜フェムト秒パルス光を伝送する
ためのファイバシステムにおいては、群速度の波長依存
性、いわゆる３次分散を補償する（平坦にする）ことが
重要である。2. Description of the Related Art In a fiber system for transmitting picosecond to femtosecond pulsed light, it is important to compensate (flatten) the wavelength dependence of group velocity, so-called third-order dispersion.
【０００３】例えば、図４（Ａ）のグラフには、一般的
な光ファイバの群遅延特性（曲線ａ）が示されている。
横軸に波長を取り、縦軸に群遅延量を取って示してあ
る。曲線ａで示すように、通常の光ファイバ、例えば
１．３μｍ零分散ファイバや分散シフトファイバなどの
場合、３次分散は正となる。すなわち、曲線ａは図中の
下側に凸となる。従って、図４（Ａ）に示す３次分散を
補償するには、図４（Ｂ）に示すような群遅延特性（曲
線ｂ）を有した補償器を用いる必要がある。For example, a graph of FIG. 4A shows a group delay characteristic (curve a) of a general optical fiber.
The horizontal axis shows the wavelength, and the vertical axis shows the group delay amount. As shown by the curve a, in the case of a normal optical fiber such as a 1.3 μm zero-dispersion fiber or a dispersion-shifted fiber, the third-order dispersion is positive. That is, the curve a is convex downward in the figure. Therefore, in order to compensate the third-order dispersion shown in FIG. 4A, it is necessary to use a compensator having a group delay characteristic (curve b) as shown in FIG. 4B.
【０００４】図４（Ｂ）のグラフには、理想的な補償器
の群遅延特性が示されている。横軸に波長を取り、縦軸
に群遅延量を取って示してある。曲線ｂは上側に凸とな
り、従って負の３次分散特性を示す。FIG. 4B shows a group delay characteristic of an ideal compensator. The horizontal axis shows the wavelength, and the vertical axis shows the group delay amount. Curve b is convex upward and thus exhibits a negative third-order dispersion characteristic.
【０００５】従来は、分散補償ファイバやＧＴ（Gires-
Tourois ）干渉計などを用いて、分散補償を行ってい
た。分散補償ファイバによれば、低損失であり、補償で
きる帯域が広く、補償量が大きく、しかも補償量をファ
イバの長さで調整できるという特徴がある。また、ＧＴ
干渉計は透過帯域内で比較的平坦な透過特性を示す。Conventionally, a dispersion compensating fiber or a GT (Gires-
Tourois) The dispersion compensation was performed using an interferometer or the like. The dispersion compensating fiber is characterized in that it has a low loss, a wide band that can be compensated, a large compensation amount, and that the compensation amount can be adjusted by the length of the fiber. Also, GT
The interferometer exhibits a relatively flat transmission characteristic in the transmission band.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、上述し
た分散補償ファイバでは、群速度分散および３次分散の
大きさが固定されているため、設計が非常に困難であ
り、２種類以上の補償ファイバを組み合わせることが必
要である。また、群速度分散と３次分散との比を、補償
対象と補償ファイバとで一致させる必要がある。さら
に、上述のＧＴ干渉計は、補償量が非常に小さいという
欠点も有している。However, in the above-mentioned dispersion compensating fiber, since the magnitudes of the group velocity dispersion and the third-order dispersion are fixed, it is very difficult to design the dispersion compensating fiber. It is necessary to combine. Further, the ratio between the group velocity dispersion and the third-order dispersion needs to be matched between the compensation target and the compensation fiber. Furthermore, the above-mentioned GT interferometer also has the disadvantage that the amount of compensation is very small.
【０００７】従って、従来より、比較的容易に設計が可
能であり、補償量の調整が比較的容易な分散補償器の出
現が望まれていた。Therefore, there has been a demand for a dispersion compensator which can be designed relatively easily and whose compensation amount can be adjusted relatively easily.
【０００８】[0008]
【課題を解決するための手段】そこで、この発明の分散
補償器によれば、複数個の共振器型フィルタが所定の間
隔をもって直線的に配列しており、共振器型フィルタの
各々は、実質的に互いに平行に対向する第１の表面およ
び第２の表面を有したスペーサ層と、第１の表面に結合
した第１の誘電体多層膜と、第２の表面に結合した第２
の誘電体多層膜とを具えていることを特徴とする。Therefore, according to the dispersion compensator of the present invention, a plurality of resonator-type filters are linearly arranged at predetermined intervals, and each of the resonator-type filters is substantially A spacer layer having a first surface and a second surface opposing each other in parallel, a first dielectric multilayer film bonded to the first surface, and a second dielectric film bonded to the second surface.
And a dielectric multilayer film.
【０００９】このように、誘電体多層膜を具えた共振器
型のフィルタによれば、誘電体多層膜における多重反射
により分散が生じるため、比較的急峻な遮断特性を有し
たフィルタを構成することができる。また、このフィル
タは、透過帯域内では比較的平坦な透過特性を示す。As described above, according to the resonator type filter having the dielectric multilayer film, since the dispersion occurs due to the multiple reflection in the dielectric multilayer film, a filter having a relatively steep cutoff characteristic can be constituted. Can be. Also, this filter shows a relatively flat transmission characteristic within the transmission band.
【００１０】例えば、図５は、このフィルタの特性を示
すグラフであり、横軸に波長を取り、縦軸に透過率を取
って示してある。図５に示すように、立ち上がりおよび
立ち下がりが急激に起こり、透過帯域内において平坦な
透過特性を示す特性が、補償器として用いるに好適であ
る。また、このフィルタは比較的大きな群遅延を示すた
め、大きな補償効果が期待できる。For example, FIG. 5 is a graph showing the characteristics of this filter, in which the horizontal axis represents wavelength and the vertical axis represents transmittance. As shown in FIG. 5, a characteristic in which rise and fall occur sharply and show a flat transmission characteristic in a transmission band is suitable for use as a compensator. Also, since this filter exhibits a relatively large group delay, a large compensation effect can be expected.
【００１１】そして、各共振器型フィルタを配列して多
重共振器化することにより、補償量を大きくすることが
できる。The amount of compensation can be increased by arranging each resonator type filter to form a multiple resonator.
【００１２】図６は、１個の共振器型フィルタの透過特
性であり、図７は、３個の共振器型フィルタを用いて構
成したフィルタの透過特性である。この例では、中心波
長を１５５０ｎｍとしている。図６および図７のグラフ
の横軸に波長をｎｍ単位で取り、１５４０ｎｍから１５
６０ｎｍの範囲を示してある。縦軸には、透過率を示し
てある。図示の通り、３重化することにより遮断特性が
向上することが分かる。よって、３次分散の補償量が大
きくなる。FIG. 6 shows the transmission characteristics of one resonator type filter, and FIG. 7 shows the transmission characteristics of a filter formed using three resonator type filters. In this example, the center wavelength is 1550 nm. The wavelengths are plotted in nm on the horizontal axis of the graphs of FIGS.
The range of 60 nm is shown. The vertical axis shows the transmittance. As shown in the figure, it can be seen that the cutoff characteristics are improved by the triple structure. Therefore, the compensation amount of the third-order dispersion increases.
【００１３】従って、共振器型フィルタの個数に応じて
補償量を変更することができる。特に、２個以上の共振
器を用いることにより、フィルタの特性は、群速度分散
が零で、かつ負の３次分散を示すようになる。従って、
３次分散を補償するための補償器が実現できる。Therefore, the amount of compensation can be changed according to the number of resonator type filters. In particular, by using two or more resonators, the characteristics of the filter have zero group velocity dispersion and negative third-order dispersion. Therefore,
A compensator for compensating for third-order dispersion can be realized.
【００１４】以下、この発明の分散補償器の分散特性の
基本的性質について述べる。 １）３次分散は波長の関数であり、どの帯域を使用する
かで、実効的な３次分散量が決まる。 ２）共振器数が１のときは、実効３次分散は正（被補償
対象のファイバと同符号）であり、共振器数が２以上で
あると負（ファイバと逆符号）となる。 ３）共振器数が多い方が群遅延量は大きくなるが、同時
にリプルも増大する。 ４）３次分散量は、フィルタの帯域幅の３乗に反比例す
る。 ５）フィルタの中心波長で群遅延分散が零になる。 ６）遮断波長近傍で３次分散量が非常に大きくなる（可
変分散）。Hereinafter, the basic characteristics of the dispersion characteristics of the dispersion compensator of the present invention will be described. 1) The third-order dispersion is a function of the wavelength, and the effective third-order dispersion is determined by which band is used. 2) When the number of resonators is 1, the effective third-order dispersion is positive (the same sign as that of the fiber to be compensated), and when the number of resonators is two or more, it is negative (the opposite sign as the fiber). 3) The group delay amount increases as the number of resonators increases, but ripples increase at the same time. 4) The third order dispersion is inversely proportional to the cube of the filter bandwidth. 5) The group delay dispersion becomes zero at the center wavelength of the filter. 6) The third-order dispersion becomes very large near the cutoff wavelength (variable dispersion).
【００１５】尚、群遅延分散（群速度分散）とは、群遅
延時間の波長依存性であり、群遅延時間を光の角周波数
で微分したものである。The group delay dispersion (group velocity dispersion) is the wavelength dependence of the group delay time, and is obtained by differentiating the group delay time with the angular frequency of light.
【００１６】また、３次分散とは、群遅延分散の波長依
存性であり、群遅延分散を光の角周波数で微分したもの
である。The third-order dispersion is the wavelength dependence of the group delay dispersion, and is obtained by differentiating the group delay dispersion with the angular frequency of light.
【００１７】以上説明したように、この発明によれば、
比較的容易に設計が可能であり、かつ補償量の調整が比
較的容易な（３次）分散補償器が実現できる。As described above, according to the present invention,
A (third-order) dispersion compensator that can be designed relatively easily and whose adjustment amount is relatively easy can be realized.
【００１８】この発明の分散補償器において、好ましく
は、第１および第２の誘電体多層膜の各々は、高屈折率
材料の層と低屈折率材料の層とが上述の配列方向に沿っ
て交互に積層したものであると良い。In the dispersion compensator according to the present invention, preferably, each of the first and second dielectric multilayer films includes a high refractive index material layer and a low refractive index material layer in the arrangement direction described above. It is good to have it laminated alternately.
【００１９】また、この発明の分散補償器において、好
ましくは、高屈折率材料をＴａ2 Ｏ5 とし、低屈折率材
料をＳｉＯ2 とするのが良い。In the dispersion compensator of the present invention, it is preferable that the high refractive index material is Ta 2 O 5 and the low refractive index material is SiO 2 .
【００２０】また、この発明の分散補償器において、好
ましくは、高屈折率材料の層および低屈折率材料の層を
それぞれ４分の１波長層とするのが良い。In the dispersion compensator of the present invention, it is preferable that each of the high refractive index material layer and the low refractive index material layer is a quarter wavelength layer.
【００２１】また、この発明の分散補償器において、好
ましくは、スペーサ層を２分の１波長層とするのが良
い。In the dispersion compensator of the present invention, it is preferable that the spacer layer is a half-wavelength layer.
【００２２】また、この発明の分散補償器において、好
ましくは、所定の間隔を、中心透過波長の４分の１の光
路長とするのが良い。Further, in the dispersion compensator of the present invention, it is preferable that the predetermined interval is set to an optical path length which is a quarter of the center transmission wavelength.
【００２３】[0023]
【発明の実施の形態】以下、図を参照して、この発明の
実施の形態につき説明する。尚、図は、この発明が理解
できる程度に構成や配置関係が概略的に示されているに
過ぎない。また、以下に記載される数値条件や材料など
は単なる一例に過ぎない。従って、この発明は、この実
施の形態に何ら限定されることがない。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. It should be noted that the drawings only schematically show the configuration and arrangement relationship to the extent that the present invention can be understood. The numerical conditions and materials described below are merely examples. Therefore, the present invention is not limited to this embodiment.
【００２４】図１（Ａ）は、この実施の形態の分散補償
器の構成を示す断面図である。この実施の形態の分散補
償器は、複数個、この例では３個の共振器型フィルタ１
０ａ、１０ｂおよび１０ｃが所定の間隔をもって直線的
に配列してなる。これら共振器型フィルタ１０ａ、１０
ｂ、１０ｃは、ガラス基板１８の上に、この順序で積層
している。共振器型フィルタ１０ａと１０ｂとの間、お
よび共振器型フィルタ１０ｂと１０ｃとの間は、それぞ
れＴａ2 Ｏ5 層２４を介した状態で結合されている。FIG. 1A is a sectional view showing the configuration of the dispersion compensator of this embodiment. The dispersion compensator of this embodiment has a plurality of, in this example, three, resonator type filters 1.
0a, 10b, and 10c are linearly arranged at predetermined intervals. These resonator filters 10a, 10a
b and 10c are laminated on the glass substrate 18 in this order. The resonator-type filters 10a and 10b and the resonator-type filters 10b and 10c are coupled to each other with a Ta 2 O 5 layer 24 interposed therebetween.
【００２５】また、共振器型フィルタ１０ａ、１０ｂ、
１０ｃの各々は、実質的に互いに平行に対向する第１の
表面１２ａおよび第２の表面１２ｂを有したスペーサ層
１２と、第１の表面１２ａに結合した第１の誘電体多層
膜１４と、第２の表面１２ｂに結合した第２の誘電体多
層膜１６とを具えている。The resonator type filters 10a, 10b,
Each of 10c includes a spacer layer 12 having a first surface 12a and a second surface 12b opposed substantially parallel to each other, a first dielectric multilayer film 14 bonded to the first surface 12a, A second dielectric multilayer film 16 coupled to the second surface 12b.
【００２６】図１（Ｂ）は、共振器型フィルタ１０ａの
構造を示す断面図である。第１の誘電体多層膜１４およ
び第２の誘電体多層膜１６の各々は、高屈折率材料の層
２０と低屈折率材料の層２２とが配列方向（図中の矢印
ａで示す方向）に沿って交互に積層したものである。こ
の例では、高屈折率材料を屈折率２．１１００のＴａ2
Ｏ5 とし、低屈折率材料を屈折率１．４６００のＳｉＯ
2 としている。また、高屈折率材料としてはＮｂ2 Ｏ5
を用いても良い。FIG. 1B is a sectional view showing the structure of the resonator type filter 10a. In each of the first dielectric multilayer film 14 and the second dielectric multilayer film 16, the high refractive index material layer 20 and the low refractive index material layer 22 are arranged in the arrangement direction (the direction indicated by the arrow a in the figure). Are alternately stacked along the line. In this example, a high-refractive-index material is made of Ta 2 having a refractive index of 2.1100.
O 5 , and the low-refractive-index material is SiO 2 having a refractive index of 1.4600.
And 2 . Nb 2 O 5 is used as a high refractive index material.
May be used.
【００２７】尚、図１（Ｂ）には、高屈折率材料の層２
０および低屈折率材料の層２２の個数が正確に示されて
いない。一例では、各層を８層程度にするのが好適であ
る。FIG. 1B shows a layer 2 of a high refractive index material.
The number of zero and low refractive index material layers 22 is not shown exactly. In one example, it is preferable that each layer has about eight layers.
【００２８】また、高屈折率材料の層（以下、Ｔａ2 Ｏ
5 層）２０および低屈折率材料の層（以下、ＳｉＯ2
層）２２をそれぞれ４分の１波長層とする。すなわち、
この例では、中心透過波長を１μｍとしているため、Ｔ
ａ2 Ｏ5 層２０およびＳｉＯ2層２２の光学的厚さがそ
れぞれ０．２５μｍとなるように形成する。A layer of a high refractive index material (hereinafter referred to as Ta 2 O)
5 layers) 20 and a layer of a low refractive index material (hereinafter, SiO 2)
Layer 22 is a quarter-wave layer. That is,
In this example, since the center transmission wavelength is 1 μm, T
The a 2 O 5 layer 20 and the SiO 2 layer 22 are formed so that the optical thickness of each is 0.25 μm.
【００２９】また、各スペーサ層１２を２分の１波長層
とする。この例では、スペーサ層１２として屈折率が
１．４６００のＳｉＯ2 層を用いており、このＳｉＯ2
層の光学的厚さが０．５μｍとなるように形成する。Each spacer layer 12 is a half-wave layer. In this example, the refractive index as the spacer layer 12 is used an SiO 2 layer of 1.4600, the SiO 2
The layer is formed to have an optical thickness of 0.5 μm.
【００３０】さらに、各共振器型フィルタの間に挿入さ
れたＴａ2 Ｏ5 層２４をそれぞれ４分の１波長層とす
る。この例では、屈折率が２．１１００および光学的厚
さが０．５μｍのＴａ2 Ｏ5 層を用いている。この結
果、各共振器型フィルタの配列間隔は中心透過波長の４
分の１の光路長となる。Further, the Ta 2 O 5 layers 24 inserted between the resonator filters are each made into a quarter wavelength layer. In this example, a Ta 2 O 5 layer having a refractive index of 2.1100 and an optical thickness of 0.5 μm is used. As a result, the arrangement interval of each resonator type filter is set to 4 times of the center transmission wavelength.
The optical path length is reduced by a factor of one.
【００３１】次に、分散補償器の特性の測定結果を示
す。この例では、分散測定を位相シフト法により行った
が、干渉法によっても同様の結果が得られる。但し、中
心波長が１５６７．５ｎｍの場合の構成につき、測定を
行った。Next, the measurement results of the characteristics of the dispersion compensator will be shown. In this example, the dispersion measurement is performed by the phase shift method, but the same result can be obtained by the interference method. However, the measurement was performed for a configuration in which the center wavelength was 1567.5 nm.
【００３２】図２は、分散補償器の透過特性を示すグラ
フである。横軸に波長をｎｍ単位で取り、縦軸に強度を
任意単位で取って示す。波長は０ｎｍを中心波長とし、
そこからのずれを−１６ｎｍから１６ｎｍの範囲で目盛
って示してある。グラフ中、破線ａおよびｂは、それぞ
れ上述した構成の分散補償器の特性を示すものであり、
実線ｃは、これら２つの分散補償器を直列に結合した場
合の特性を示している。FIG. 2 is a graph showing transmission characteristics of the dispersion compensator. The horizontal axis indicates the wavelength in nm, and the vertical axis indicates the intensity in arbitrary units. The wavelength is centered on 0 nm,
The deviation therefrom is shown in a scale from -16 nm to 16 nm. In the graph, broken lines a and b show the characteristics of the dispersion compensator having the above-described configuration, respectively.
The solid line c shows the characteristics when these two dispersion compensators are coupled in series.
【００３３】図３は、分散補償器の３次分散特性を示す
グラフである。横軸に波長をｎｍ単位で取り、縦軸に３
次分散量をｐｓ3 単位で取って示す。波長は０ｎｍを中
心波長とし、そこからのずれを−６ｎｍから６ｎｍの範
囲で目盛って示してある。グラフ中、破線ａおよびｂ
は、それぞれ上述した構成の分散補償器の３次分散特性
を示すものであり、実線ｃは、これら２つの分散補償器
を直列に結合した場合の３次分散特性を示している。そ
れぞれ、中心波長近傍で負となっている。FIG. 3 is a graph showing a third-order dispersion characteristic of the dispersion compensator. The horizontal axis represents the wavelength in nm, and the vertical axis represents 3
It indicates taking the following dispersion amount in ps 3 units. The wavelength has a center wavelength of 0 nm, and the deviation therefrom is graduated in the range of -6 nm to 6 nm. In the graph, broken lines a and b
Indicates the third-order dispersion characteristics of the dispersion compensator having the above-described configuration, and the solid line c indicates the third-order dispersion characteristics when these two dispersion compensators are coupled in series. Each is negative near the center wavelength.
【００３４】[0034]
【発明の効果】この発明の分散補償器によれば、誘電体
多層膜を具えた共振器型のフィルタを用いる。この誘電
体多層膜における多重反射により分散が生じるため、比
較的急峻な遮断特性を有したフィルタを構成することが
できる。また、このフィルタは、透過帯域内では比較的
平坦な透過特性を示す。また、このフィルタは比較的大
きな群遅延を示すため、大きな補償効果が期待できる。
そして、各共振器型フィルタを配列して多重共振器化す
ることにより、補償量を大きくすることができる。従っ
て、共振器型フィルタの個数に応じて補償量を変更する
ことができる。特に、２個以上の共振器を用いることに
より、フィルタの特性は、群速度分散が零で、かつ負の
３次分散を示すようになる。従って、比較的容易に設計
が可能であり、かつ補償量の調整が比較的容易な（３
次）分散補償器が実現できる。According to the dispersion compensator of the present invention, a resonator type filter having a dielectric multilayer film is used. Since dispersion occurs due to multiple reflection in the dielectric multilayer film, a filter having a relatively steep cutoff characteristic can be configured. Also, this filter shows a relatively flat transmission characteristic within the transmission band. Also, since this filter exhibits a relatively large group delay, a large compensation effect can be expected.
The amount of compensation can be increased by arranging the resonator filters to form a multiple resonator. Therefore, the compensation amount can be changed according to the number of resonator type filters. In particular, by using two or more resonators, the characteristics of the filter have zero group velocity dispersion and negative third-order dispersion. Therefore, the design can be performed relatively easily, and the adjustment of the compensation amount is relatively easy (3.
Next, a dispersion compensator can be realized.
【図１】実施の形態の分散補償器の構成を示す図であ
る。FIG. 1 is a diagram illustrating a configuration of a dispersion compensator according to an embodiment.
【図２】分散補償器の透過特性を示す図である。FIG. 2 is a diagram illustrating transmission characteristics of a dispersion compensator.
【図３】分散補償器の３次分散特性を示す図である。FIG. 3 is a diagram illustrating a third-order dispersion characteristic of a dispersion compensator.
【図４】従来技術の説明に供する図である。FIG. 4 is a diagram provided for explanation of a conventional technique.
【図５】フィルタ特性を示す図である。FIG. 5 is a diagram illustrating filter characteristics.
【図６】１個の共振器型フィルタの透過特性を示す図で
ある。FIG. 6 is a diagram showing transmission characteristics of one resonator type filter.
【図７】３個の共振器型フィルタで構成したフィルタの
透過特性を示す図である。FIG. 7 is a diagram showing transmission characteristics of a filter constituted by three resonator filters.
１０ａ、１０ｂ、１０ｃ：共振器型フィルタ １２ａ：第１の表面 １２ｂ：第２の表面 １２：スペーサ層 １４：第１の誘電体多層膜 １６：第２の誘電体多層膜 １８：ガラス基板 ２４：Ｔａ2 Ｏ5 層 ２０：高屈折率材料の層（Ｔａ2 Ｏ5 層） ２２：低屈折率材料の層（ＳｉＯ2 層）10a, 10b, 10c: resonator type filter 12a: first surface 12b: second surface 12: spacer layer 14: first dielectric multilayer 16: second dielectric multilayer 18: glass substrate 24: Ta 2 O 5 layer 20: High refractive index material layer (Ta 2 O 5 layer) 22: Low refractive index material layer (SiO 2 layer)
フロントページの続き (72)発明者 菊池 和朗 神奈川県横浜市港北区新吉田町1139−１ フォルム綱島クレスタワーズ1304 (72)発明者 多久島 裕一 埼玉県川口市芝富士２丁目18番18号 セイ ケイハイツ202号 (72)発明者 マーク ケンネス ジャボロンスキー 東京都目黒区駒場４丁目６番29号 Ｋ518 (72)発明者 田中 佑一 東京都杉並区和田１丁目13番23号 株式会 社応用光電研究室内 (72)発明者 東 伸 東京都杉並区和田１丁目13番23号 株式会 社応用光電研究室内 Ｆターム(参考） 2H048 GA04 GA13 GA23 GA30 GA34 GA48 GA52 GA62 Continued on the front page (72) Inventor Kazuo Kikuchi 1139-1 Shinyoshida-cho, Kohoku-ku, Yokohama-shi, Kanagawa 1304 Form Tsunashima Cres Towers 1304 (72) Inventor Yuichi Takushima 2-18-18 Shiba Fuji, Kawaguchi-shi, Saitama Sei Kei Heights 202 No. (72) Inventor Mark Kennes Jaboronsky K518, 4-6-129 Komaba, Meguro-ku, Tokyo K72 ) Inventor Shin Shin Higashi 1-13-23 Wada, Suginami-ku, Tokyo F-term (reference) 2H048 GA04 GA13 GA23 GA30 GA34 GA48 GA52 GA62
Claims (6)
をもって直線的に配列しており、 前記共振器型フィルタの各々は、 実質的に互いに平行に対向する第１の表面および第２の
表面を有したスペーサ層と、 前記第１の表面に結合した第１の誘電体多層膜と、 前記第２の表面に結合した第２の誘電体多層膜とを具え
ていることを特徴とする分散補償器。A plurality of resonator-type filters are linearly arranged at a predetermined interval, and each of the resonator-type filters has a first surface and a second surface substantially parallel to each other. A spacer layer having a surface, a first dielectric multilayer film bonded to the first surface, and a second dielectric multilayer film bonded to the second surface. Dispersion compensator.
材料の層と低屈折率材料の層とが前記配列方向に沿って
交互に積層したものであることを特徴とする分散補償
器。2. The dispersion compensator according to claim 1, wherein each of the first and second dielectric multilayer films includes a high refractive index material layer and a low refractive index material layer in the arrangement direction. A dispersion compensator characterized in that the dispersion compensators are alternately stacked along the same.
をＳｉＯ2 とすることを特徴とする分散補償器。3. The dispersion compensator according to claim 2, wherein the high refractive index material is Ta 2 O 5 and the low refractive index material is SiO 2 .
れ４分の１波長層とすることを特徴とする分散補償器。4. The dispersion compensator according to claim 2, wherein each of the high refractive index material layer and the low refractive index material layer is a quarter wavelength layer.
る分散補償器。5. The dispersion compensator according to claim 1, wherein the spacer layer is a half-wavelength layer.
することを特徴とする分散補償器。6. The dispersion compensator according to claim 1, wherein the predetermined interval is an optical path length that is one quarter of a center transmission wavelength.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10277473A JP2000105313A (en) | 1998-09-30 | 1998-09-30 | Dispersion compensator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10277473A JP2000105313A (en) | 1998-09-30 | 1998-09-30 | Dispersion compensator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000105313A true JP2000105313A (en) | 2000-04-11 |
Family
ID=17584092
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10277473A Withdrawn JP2000105313A (en) | 1998-09-30 | 1998-09-30 | Dispersion compensator |
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