JPH08211237A - Array grid type optical multiplexer and demultiplexer - Google Patents
Array grid type optical multiplexer and demultiplexerInfo
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- JPH08211237A JPH08211237A JP1823795A JP1823795A JPH08211237A JP H08211237 A JPH08211237 A JP H08211237A JP 1823795 A JP1823795 A JP 1823795A JP 1823795 A JP1823795 A JP 1823795A JP H08211237 A JPH08211237 A JP H08211237A
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- waveguide
- waveguides
- demultiplexer
- channel
- fan
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、光周波数多重（ＦＤ
Ｍ）通信方式あるいは光波長多重（ＷＤＭ）通信方式に
おいて使用するアレイ格子型光合分波器に関する。BACKGROUND OF THE INVENTION The present invention relates to optical frequency multiplexing (FD).
M) An array grating type optical multiplexer / demultiplexer used in a communication system or an optical wavelength division multiplexing (WDM) communication system.
【０００２】[0002]
【従来の技術】図４は、アレイ格子型光合分波器の基本
構成を示す。図において、アレイ格子型光合分波器は、
基板１０上に形成したＮ本の入力用チャネル導波路１
１、第１の扇形スラブ導波路１２、所定の導波路長差Δ
Ｌで順次長くなるＭ本の導波路からなるチャネル導波路
アレイ１３、第２の扇形スラブ導波路１４、Ｎ本の出力
用チャネル導波路１５を順次接続した構成である。2. Description of the Related Art FIG. 4 shows the basic structure of an array grating type optical multiplexer / demultiplexer. In the figure, the array grating type optical multiplexer / demultiplexer is
N input channel waveguides 1 formed on the substrate 10
1, the first fan-shaped slab waveguide 12, a predetermined waveguide length difference Δ
This is a configuration in which a channel waveguide array 13 including M waveguides that become longer in L order, a second fan-shaped slab waveguide 14, and N output channel waveguides 15 are sequentially connected.
【０００３】図５は、第２の扇形スラブ導波路１４の近
傍の構造を示す拡大図である。なお、第１の扇形スラブ
導波路１２においても同様である。図において、Ｒは扇
形スラブ導波路１４の曲率半径、２ａはチャネル導波路
アレイ１３および出力用チャネル導波路１５の各導波路
のコア幅、Ｄ1 はチャネル導波路アレイ１３の各導波路
のコア開口幅、ｄはチャネル導波路アレイ１３のスラブ
導波路境界での導波路間隔（ｄは等間隔）、Ｄ2 は出力
用チャネル導波路１５の各導波路のコア開口幅、Ｓは出
力用チャネル導波路１５のスラブ導波路境界での導波路
間隔（以下、出力用チャネル導波路１５の間隔という。
入力用チャネル導波路１１の間隔という場合も同様とす
る。）、ｈ1 ，ｈ2 は各テーパ導波路部分の長さを示
す。FIG. 5 is an enlarged view showing the structure in the vicinity of the second fan-shaped slab waveguide 14. The same applies to the first fan-shaped slab waveguide 12. In the figure, R is the radius of curvature of the fan-shaped slab waveguide 14, 2a is the core width of each waveguide of the channel waveguide array 13 and the output channel waveguide 15, and D 1 is the core of each waveguide of the channel waveguide array 13. Aperture width, d is the waveguide spacing (d is equal spacing) at the slab waveguide boundary of the channel waveguide array 13, D 2 is the core opening width of each waveguide of the output channel waveguide 15, and S is the output channel. Waveguide spacing at the slab waveguide boundary of the waveguide 15 (hereinafter referred to as the spacing of the output channel waveguides 15).
The same applies to the interval between the input channel waveguides 11. ), H 1 and h 2 indicate the length of each tapered waveguide portion.
【０００４】ここで、従来のアレイ格子型光合分波器で
は、出力用チャネル導波路１５の間隔Ｓは等間隔であっ
た。同様に、入力用チャネル導波路１１の間隔も等間隔
であり、かつ入力用チャネル導波路１１の間隔と出力用
チャネル導波路１５の間隔が同一に設定されていた。こ
のような構成では、所定の入力用チャネル導波路１１か
ら入射した光は、第１の扇形スラブ導波路１２において
回折により広がり、その回折面と垂直に配置されたチャ
ネル導波路アレイ１３に導かれる。チャネル導波路アレ
イ１３は、各導波路が導波路長差ΔＬで順次長くなって
いるので、各導波路を伝搬して第２の扇形スラブ導波路
１４に到達した光には導波路長差ΔＬに対応する位相差
が生じている。この位相差は光周波数により異なるの
で、第２の扇形スラブ導波路１４のレンズ効果で出力用
チャネル導波路１５の入力端に集光する際に、光周波数
ごとに異なる位置に集光する。すなわち、入力用チャネ
ル導波路１１から入射された光の周波数に対応して、出
力用チャネル導波路１５の導波路が選択される光分波器
として動作する。また、逆の経路を経ることにより同様
に光合波器として動作せることができる。Here, in the conventional array grating type optical multiplexer / demultiplexer, the spacing S between the output channel waveguides 15 is equal. Similarly, the intervals between the input channel waveguides 11 are equal, and the intervals between the input channel waveguides 11 and the output channel waveguides 15 are set to be the same. In such a configuration, the light incident from the predetermined input channel waveguide 11 spreads by diffraction in the first fan-shaped slab waveguide 12 and is guided to the channel waveguide array 13 arranged perpendicular to the diffractive surface. . In the channel waveguide array 13, since the respective waveguides are sequentially lengthened with the waveguide length difference ΔL, the light having propagated through the respective waveguides and reaching the second fan-shaped slab waveguide 14 has a waveguide length difference ΔL. There is a phase difference corresponding to. Since this phase difference varies depending on the optical frequency, when the light is focused on the input end of the output channel waveguide 15 by the lens effect of the second fan-shaped slab waveguide 14, it is focused on different positions for each optical frequency. That is, it operates as an optical demultiplexer in which the waveguide of the output channel waveguide 15 is selected according to the frequency of the light incident from the input channel waveguide 11. In addition, it is possible to operate similarly as an optical multiplexer by going through the reverse path.
【０００５】図６は、従来のアレイ格子型光合分波器の
フィルタ特性の測定結果を示す。各チャネル導波路のコ
ア幅２ａ＝７μｍ、コア厚２ｔ＝７μｍ、比屈折率差Δ
＝0.75％とした。また、ｈ1 ＝１ｍｍ、Ｄ1 ＝20μｍ、
ｈ2 ＝0.5 ｍｍ、Ｄ2 ＝12μｍ、Ｒ＝14.4ｍｍ、ｄ＝Ｓ
＝22μｍ、ΔＬ＝79μｍ、回折次数ｍ＝74、Ｎ＝16、Ｍ
＝100 とした。FIG. 6 shows the measurement result of the filter characteristic of the conventional array grating type optical multiplexer / demultiplexer. Core width of each channel waveguide 2a = 7 μm, core thickness 2t = 7 μm, relative refractive index difference Δ
= 0.75%. Also, h 1 = 1 mm, D 1 = 20 μm,
h 2 = 0.5 mm, D 2 = 12 μm, R = 14.4 mm, d = S
= 22 μm, ΔL = 79 μm, diffraction order m = 74, N = 16, M
= 100.
【０００６】このとき、従来のアレイ格子型光合分波器
のフィルタ特性は、各出力用チャネル導波路１５の通過
中心波長が等間隔（図６では0.64ｎｍ間隔（波長1.55μ
ｍ帯で80ＧHz間隔））であった。第２の扇形スラブ導波
路１４において、波長λ（あるいは光周波数ｆ）に対す
る集光スポット位置ｘの変化は、＋ｘを図６における右
方向にとると、 Δｘ／Δλ＝−ＲΔＬ／λ0ｄ， Δｘ／Δｆ＝−ＲΔＬ／ｆ0ｄ …(1) で与えられる。ここで、λ0 は波長多重信号の中心波長
であり、ｆ0(＝ｃ／λ0)は中心光周波数である。式(1)
のＲ，ΔＬ，ｄ，λ0 ，ｆ0 はすべて一定値であるの
で、光の波長λ（光周波数ｆ）に対する集光スポット位
置ｘの変化は一定であることがわかる。したがって、出
力用チャネル導波路１５（入力用チャネル導波路１４）
が等間隔に配置されている場合には、図６に示すように
分波される波長多重信号光（周波数多重信号光）の間隔
も一定になることが分る。At this time, regarding the filter characteristics of the conventional array grating type optical multiplexer / demultiplexer, the passing center wavelengths of the respective output channel waveguides 15 are equidistant (0.64 nm interval (wavelength 1.55 μm in FIG. 6).
It was 80 GHz interval in m band)). In the second fan-shaped slab waveguide 14, the change of the focused spot position x with respect to the wavelength λ (or the optical frequency f) is Δx / Δλ = −RΔL / λ 0 d, when + x is taken in the right direction in FIG. Δx / Δf = −RΔL / f 0 d (1) Here, λ 0 is the center wavelength of the wavelength division multiplexed signal, and f 0 (= c / λ 0 ) is the center optical frequency. Formula (1)
Since R, ΔL, d, λ 0 , and f 0 are all constant values, it can be seen that the change of the focused spot position x with respect to the wavelength λ of the light (optical frequency f) is constant. Therefore, the output channel waveguide 15 (input channel waveguide 14)
It can be seen that when the signals are arranged at equal intervals, the wavelength-division-multiplexed signal light (frequency-multiplexed signal light) to be demultiplexed also has a constant interval, as shown in FIG.
【０００７】[0007]
【発明が解決しようとする課題】従来のアレイ格子型光
合分波器では、周波数多重信号光（波長多重信号光）の
各光周波数（波長）が等間隔であるときに、４光波混合
によって周波数多重信号光（波長多重信号光）間にクロ
ストークが生じる問題があった。ここで、４光波混合と
は、光周波数ｆi ，ｆj ，ｆk （ｋ≠ｉ，ｊ）の３つの
光波が光ファイバの３次の非線形感受率χ(3) を介して
相互作用し、光周波数ｆF＝ｆi＋ｆj−ｆkの光波を発生
させる非線形プロセスである。光周波数（波長）が等間
隔に配置された周波数多重信号光（波長多重信号光）で
は、４光波混合によって生じる新たな光波は、他の信号
周波数に重なってクロストークを生じさせることにな
る。In the conventional array grating type optical multiplexer / demultiplexer, when the optical frequencies (wavelengths) of the frequency-multiplexed signal light (wavelength-multiplexed signal light) are at equal intervals, the frequency is changed by four-wave mixing. There is a problem that crosstalk occurs between multiplexed signal lights (wavelength multiplexed signal lights). Here, four-wave mixing means that three light waves having optical frequencies f i , f j , and f k (k ≠ i, j) interact with each other via the third-order nonlinear susceptibility χ (3) of the optical fiber. , A non-linear process for generating a light wave of optical frequency f F = f i + f j −f k . In frequency-multiplexed signal light (wavelength-multiplexed signal light) in which optical frequencies (wavelengths) are arranged at equal intervals, a new light wave generated by four-wave mixing overlaps other signal frequencies and causes crosstalk.
【０００８】したがって、４光波混合によるクロストー
クを抑制するためには、光信号の周波数間隔（波長間
隔）を不等間隔にする必要があり、これに対応して光合
分波器の光周波数フィルタ特性（光波長フィルタ特性）
も不等間隔にする必要があった。また、システムの要求
や作製時のパラメータ変動に対応して、分波特性の中心
波長を変えることができるようにするには、光合分波器
の光周波数フィルタ特性（光波長フィルタ特性）も不等
間隔にする必要があった。Therefore, in order to suppress crosstalk due to four-wave mixing, it is necessary to make the frequency intervals (wavelength intervals) of the optical signals unequal, and correspondingly, the optical frequency filter of the optical multiplexer / demultiplexer. Characteristics (optical wavelength filter characteristics)
Had to be evenly spaced. Also, in order to be able to change the center wavelength of the demultiplexing characteristics in response to system requirements and parameter fluctuations during fabrication, the optical frequency filter characteristics (optical wavelength filter characteristics) of the optical multiplexer / demultiplexer must also be changed. We needed to have unequal spacing.
【０００９】本発明は、チャネル間隔が不等間隔の光周
波数フィルタ特性（あるいは光波長フィルタ特性）を有
するアレイ格子型光合分波器を提供することを目的とす
る。It is an object of the present invention to provide an array grating type optical multiplexer / demultiplexer having optical frequency filter characteristics (or optical wavelength filter characteristics) with unequal channel intervals.
【００１０】[0010]
【課題を解決するための手段】本発明のアレイ格子型光
合分波器は、入力用チャネル導波路の間隔、または出力
用チャネル導波路の間隔の少なくとも一方が不等間隔で
あることを特徴とする。また、本発明のアレイ格子型光
合分波器は、入力用チャネル導波路の間隔と、出力用チ
ャネル導波路の間隔が異なることを特徴とする。The array grating type optical multiplexer / demultiplexer according to the present invention is characterized in that at least one of the intervals between the input channel waveguides and the intervals between the output channel waveguides is unequal. To do. The array grating type optical multiplexer / demultiplexer of the present invention is characterized in that the interval between the input channel waveguides and the interval between the output channel waveguides are different.
【００１１】[0011]
【作用】本発明のアレイ格子型光合分波器は、入力用チ
ャネル導波路の間隔、または出力用チャネル導波路の間
隔の少なくとも一方を不等間隔とすることにより、チャ
ネル間隔が不等間隔の光周波数フィルタ特性（あるいは
光波長フィルタ特性）が得られる。In the array grating type optical multiplexer / demultiplexer of the present invention, at least one of the intervals between the input channel waveguides and the intervals between the output channel waveguides is made unequal, so that the channel intervals are unequal. Optical frequency filter characteristics (or optical wavelength filter characteristics) can be obtained.
【００１２】また、本発明のアレイ格子型光合分波器
は、入力用チャネル導波路の間隔と、出力用チャネル導
波路の間隔が異なるように形成することにより、入力導
波路の位置を変えることにより分波特性の中心波長を変
えることができる。In the array grating type optical multiplexer / demultiplexer of the present invention, the position of the input waveguide can be changed by forming the interval of the input channel waveguide and the interval of the output channel waveguide different from each other. Can change the center wavelength of the demultiplexing characteristic.
【００１３】[0013]
【実施例】本発明のアレイ格子型光合分波器の基本構成
は従来のものとほぼ同じである。すなわち、図４に示す
ように、基板１０上に形成したＮ本の入力用チャネル導
波路１１、第１の扇形スラブ導波路１２、所定の導波路
長差ΔＬで順次長くなるＭ本の導波路からなるチャネル
導波路アレイ１３、第２の扇形スラブ導波路１４、Ｎ本
の出力用チャネル導波路１５を順次接続した構成であ
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS The basic structure of the array grating type optical multiplexer / demultiplexer of the present invention is almost the same as the conventional one. That is, as shown in FIG. 4, N input channel waveguides 11 formed on a substrate 10, a first fan-shaped slab waveguide 12, and M waveguides that sequentially become longer with a predetermined waveguide length difference ΔL. In this configuration, the channel waveguide array 13 including the second, the second fan-shaped slab waveguide 14, and the N output channel waveguides 15 are sequentially connected.
【００１４】本発明の特徴は、入力用チャネル導波路
１１の間隔と出力用チャネル導波路１５の間隔の少なく
とも一方を不等間隔とする、入力用チャネル導波路１
１の間隔と出力用チャネル導波路１５の間隔がともに等
間隔であるものの両者の間隔が異なる、入力用チャネ
ル導波路１１の間隔と出力用チャネル導波路１５の間隔
がともに不等間隔であり、かつ両者の間隔が異なること
である。以下、における出力用チャネル導波路１５の
間隔を不等間隔とした場合を第１実施例とし、の場合
を第２実施例として説明する。なお、の場合は第１実
施例と第２実施例を組み合わせたものとなり、両者の特
性を兼ね備えたものとなる。A feature of the present invention is that the input channel waveguide 1 has at least one of the input channel waveguide 11 and the output channel waveguide 15 unequal intervals.
The intervals of 1 and the output channel waveguides 15 are equal, but the intervals of both are different, and the intervals of the input channel waveguide 11 and the output channel waveguide 15 are both unequal, And the distance between them is different. Hereinafter, the case where the intervals of the output channel waveguides 15 are unequal intervals will be described as a first example, and the case will be described as a second example. In the case of, the first embodiment and the second embodiment are combined, and the characteristics of both are combined.
【００１５】（第１実施例）図１は、第１実施例におけ
る第２の扇形スラブ導波路１４の近傍の構造を示す拡大
図である。図において、本実施例では、ｓi が左側から
数えて（ｉ−１）番目とｉ番目（ｉ＝２〜Ｎ）の出力用
チャネル導波路１５の間隔となる。その他の各パラメー
タは図５に示す従来構成と同じである。なお、図中破線
は、図５に示す従来のアレイ格子型光合分波器における
等間隔（Ｓ＝22μｍ）の出力用チャネル導波路１５の位
置を示す。また、入力用チャネル導波路１１の間隔は、
等間隔でも不等間隔でも以下に示す不等間隔の光周波数
フィルタ特性は得られる。(First Embodiment) FIG. 1 is an enlarged view showing the structure in the vicinity of the second fan-shaped slab waveguide 14 in the first embodiment. In the figure, in this embodiment, s i is the interval between the (i−1) th and the i-th (i = 2 to N) output channel waveguides 15 counted from the left side. Other parameters are the same as those in the conventional configuration shown in FIG. The broken lines in the figure indicate the positions of the output channel waveguides 15 at equal intervals (S = 22 μm) in the conventional array grating type optical multiplexer / demultiplexer shown in FIG. The distance between the input channel waveguides 11 is
The following optical frequency filter characteristics with unequal intervals can be obtained with equal or unequal intervals.
【００１６】各チャネル導波路のコア幅２ａ＝７μｍ、
コア厚２ｔ＝７μｍ、比屈折率差Δ＝0.75％とした。ま
た、ｈ1 ＝１ｍｍ、Ｄ1 ＝20μｍ、ｈ2 ＝0.5 ｍｍ、Ｄ
2 ＝12μｍ、Ｒ＝14.4ｍｍ、ｄ＝22μｍ、ΔＬ＝79μ
ｍ、回折次数ｍ＝74、Ｎ＝16、Ｍ＝100 とし、出力用チ
ャネル導波路１５の間隔ｓi として ｓ2 ＝Ｓ−δｓ，ｓ3 ＝Ｓ−δｓ，ｓ4 ＝Ｓ＋δｓ， ｓ5 ＝Ｓ＋δｓ，ｓ6 ＝Ｓ−δｓ，ｓ7 ＝Ｓ−δｓ，ｓ8 ＝Ｓ＋δｓ， ｓ9 ＝Ｓ＋δｓ，ｓ10＝Ｓ−δｓ，ｓ11＝Ｓ−δｓ，ｓ12＝Ｓ＋δｓ， ｓ13＝Ｓ＋δｓ，ｓ14＝Ｓ−δｓ，ｓ15＝Ｓ−δｓ，ｓ16＝Ｓ＋δｓ …(2) と設定した。ただし、δｓ＝Ｓ／４＝5.5 μｍとした。The core width of each channel waveguide 2a = 7 μm,
The core thickness was 2t = 7 μm, and the relative refractive index difference Δ = 0.75%. Also, h 1 = 1 mm, D 1 = 20 μm, h 2 = 0.5 mm, D
2 = 12μm, R = 14.4mm, d = 22μm, ΔL = 79μ
m, diffraction order m = 74, N = 16, M = 100, and the spacing s i of the output channel waveguide 15 is s 2 = S−δs, s 3 = S−δs, s 4 = S + δs, s 5 = S + δs, s 6 = S-δs, s 7 = S-δs, s 8 = S + δs, s 9 = S + δs, s 10 = S-δs, s 11 = S-δs, s 12 = S + δs, s 13 = S + δs, It was set that s 14 = S−δs, s 15 = S−δs, s 16 = S + δs (2). However, δs = S / 4 = 5.5 μm.
【００１７】このようなパラメータに基づいてマスクを
作製し、石英系光導波路を用いて本実施例のアレイ格子
型光合分波器を作製した。まず、Ｓi 基板（１０）上に
火炎堆積法によりＳiＯ2下部クラッド層を堆積し、次に
ＧeＯ2をドーパントとして添加したＳiＯ2ガラスのコア
層を堆積した後に、電気炉で透明ガラス化した。次に、
前記設計に基づく図１，図４に示すパターンを用いてコ
ア層をエッチングして光導波路部分を作製した。最後
に、再びＳiＯ2上部クラッド層を堆積した。A mask was prepared on the basis of the above parameters, and an array grating type optical multiplexer / demultiplexer of this example was prepared using a silica optical waveguide. First, a SiO 2 lower clad layer was deposited on the Si substrate (10) by a flame deposition method, and then a core layer of SiO 2 glass doped with GeO 2 as a dopant was deposited, followed by vitrification in an electric furnace. next,
The core layer was etched using the patterns shown in FIGS. 1 and 4 based on the above design to produce an optical waveguide portion. Finally, the SiO 2 upper clad layer was deposited again.
【００１８】このようにして作製されたアレイ格子型光
合分波器の分波特性を測定した結果を図２に示す。この
図からも分かるように、出力用チャネル導波路１５の各
導波路ごとに分波される波長多重信号光（周波数多重信
号光）の間隔が不等間隔になることが確認された。ま
た、このような不等間隔の波長多重信号光（周波数多重
信号光）を用いることにより、４光波混合によって生じ
る周波数ｆF＝ｆi＋ｆj−ｆkの不要光成分と他の信号光
の周波数とを相違させることができる。これにより、４
光波混合光が他の信号周波数に重なってクロストークを
生じさせることを抑制することができる。FIG. 2 shows the result of measurement of the demultiplexing characteristics of the array grating type optical multiplexer / demultiplexer thus manufactured. As can be seen from this figure, it was confirmed that the wavelength-division-multiplexed signal lights (frequency-division-multiplexed signal lights) separated in each waveguide of the output channel waveguide 15 have unequal intervals. Further, by using such wavelength-multiplexed signal light (frequency-multiplexed signal light) with unequal intervals, unnecessary light components of frequency f F = f i + f j −f k generated by four-wave mixing and other signal light are generated. The frequency can be different. This gives 4
It is possible to prevent the light-wave mixed light from overlapping with other signal frequencies and causing crosstalk.
【００１９】（第２実施例）図３は、第２実施例におけ
る第１の扇形スラブ導波路１２および第２の扇形スラブ
導波路１４の近傍の構造を示す拡大図である。図におい
て、本実施例では入力用チャネル導波路１１の間隔をＳ
＋δｓ（等間隔）とし、出力用チャネル導波路１５の間
隔をＳ（等間隔）とする。ただし、入力用チャネル導波
路１１の中央の導波路位置は、間隔がＳである従来位置
と同じとし、δｓ＝Ｓ／10＝2.2 μｍとした。その他の
パラメータは第１実施例と同じである。このとき、16チ
ャネル（Ｎ＝16）の場合に、入力用チャネル導波路１１
の左側から数えてｉ番目（ｉ＝１〜16）の導波路位置の
従来位置からのずれφiは、 φi ＝（ｉ−８）δｓ …(3) となる。(Second Embodiment) FIG. 3 is an enlarged view showing the structure in the vicinity of the first fan-shaped slab waveguide 12 and the second fan-shaped slab waveguide 14 in the second embodiment. In the figure, in this embodiment, the distance between the input channel waveguides 11 is S
Let + δs (equal spacing) and the spacing of the output channel waveguides 15 be S (equal spacing). However, the waveguide position at the center of the input channel waveguide 11 is the same as the conventional position where the interval is S, and δs = S / 10 = 2.2 μm. Other parameters are the same as those in the first embodiment. At this time, in the case of 16 channels (N = 16), the input channel waveguide 11
The deviation φ i of the i-th (i = 1 to 16) waveguide position from the conventional position, counted from the left side of, is φ i = (i−8) δs (3).
【００２０】このようなパラメータに基づいて第１実施
例の場合と同様に作製されたアレイ格子型光合分波器の
分波特性を測定したところ、次のような結果が得られ
た。ただし、δλ＝チャネル間隔／10＝0.064 ｎｍ（８
ＧHz）である。 ６番目の入力導波路に波長多重信号光を入射する
と、７番目の出力導波路に（λ0 −２δλ）の波長の光
が出射され、他の出力導波路には0.64ｎｍ（80ＧHz）間
隔の異なる信号光が順次出射された。When the demultiplexing characteristics of the array grating type optical multiplexer / demultiplexer manufactured in the same manner as in the first embodiment were measured based on such parameters, the following results were obtained. However, δλ = channel spacing / 10 = 0.064 nm (8
GHz). When wavelength-multiplexed signal light is input to the sixth input waveguide, light of wavelength (λ 0 -2δλ) is emitted to the seventh output waveguide, and 0.64 nm (80 GHz) intervals are output to the other output waveguides. Different signal lights were sequentially emitted.
【００２１】 ７番目の入力導波路に波長多重信号光
を入射すると、８番目の出力導波路に（λ0 −δλ）の
波長の光が出射され、他の出力導波路には0.64ｎｍ間隔
の異なる信号光が順次出射された。 ８番目の入力導波路に波長多重信号光を入射する
と、９番目の出力導波路にλ0 の波長の光が出射され、
他の出力導波路には0.64ｎｍ間隔の異なる信号光が順次
出射された。When wavelength-multiplexed signal light is incident on the seventh input waveguide, light having a wavelength of (λ 0 −δλ) is emitted to the eighth output waveguide, and 0.64 nm intervals are emitted to the other output waveguides. Different signal lights were sequentially emitted. When wavelength-multiplexed signal light is incident on the eighth input waveguide, light having a wavelength of λ 0 is emitted to the ninth output waveguide,
Signal lights with different intervals of 0.64 nm were sequentially emitted to the other output waveguides.
【００２２】 ９番目の入力導波路に波長多重信号光
を入射すると、10番目の出力導波路に（λ0 ＋δλ）の
波長の光が出射され、他の出力導波路には0.64ｎｍ間隔
の異なる信号光が順次出射された。 10番目の入力導波路に波長多重信号光を入射する
と、11番目の出力導波路に（λ0 ＋２δλ）の波長の光
が出射され、他の出力導波路には0.64ｎｍ（80ＧHz）間
隔の異なる信号光が順次出射された。When wavelength-multiplexed signal light is incident on the 9th input waveguide, light having a wavelength of (λ 0 + δλ) is emitted to the 10th output waveguide, and the other output waveguides have different intervals of 0.64 nm. The signal light was emitted sequentially. When wavelength-multiplexed signal light is input to the 10th input waveguide, light of wavelength (λ 0 + 2δλ) is output to the 11th output waveguide, and 0.64nm (80GHz) intervals are different to other output waveguides. The signal light was emitted sequentially.
【００２３】以上の結果から、第２実施例のアレイ格子
型光合分波器では、入力用チャネル導波路１１の間隔と
出力用チャネル導波路１５の間隔を相違させることによ
り、波長多重信号光を異なる入力導波路に入射した場合
の分波特性の中心波長を λ0 ＋ｊδλ （ｊは正負の整数） …(4) のように設定することができる。すなわち、要求条件に
応じて分波特性の中心波長を変えることができる。From the above results, in the array grating type optical multiplexer / demultiplexer of the second embodiment, the wavelength-division multiplexed signal light is generated by making the interval between the input channel waveguide 11 and the output channel waveguide 15 different. The center wavelength of the demultiplexing characteristics when incident on different input waveguides can be set as λ 0 + jδλ (j is a positive or negative integer) (4). That is, the center wavelength of the demultiplexing characteristic can be changed according to the required conditions.
【００２４】また、アレイ格子型光合分波器の作製時の
パラメータ変動によって中心波長がシステムの設定値か
らずれた場合にも、用いる入力用チャネル導波路１１の
入力位置を変えることにより調整することができる。Further, even when the central wavelength deviates from the set value of the system due to the parameter variation at the time of manufacturing the array grating type optical multiplexer / demultiplexer, the adjustment can be made by changing the input position of the input channel waveguide 11 to be used. You can
【００２５】[0025]
【発明の効果】以上説明したように、本発明のアレイ格
子型光合分波器では、チャネル間隔が不等間隔の光周波
数フィルタ特性（あるいは光波長フィルタ特性）が得ら
れるので、４光波混合によるクロストークの影響を抑制
することができる。また、本発明のアレイ格子型光合分
波器では、入力導波路の位置を変えることにより分波特
性の中心波長を変えることができるので、システムの要
求や作製時のパラメータ変動に容易に対応することがで
きる。As described above, in the array grating type optical multiplexer / demultiplexer of the present invention, optical frequency filter characteristics (or optical wavelength filter characteristics) with unequal channel intervals can be obtained. The influence of crosstalk can be suppressed. Further, in the array grating type optical multiplexer / demultiplexer of the present invention, the center wavelength of the demultiplexing characteristic can be changed by changing the position of the input waveguide, so that it is possible to easily respond to system requirements and parameter fluctuations during fabrication. can do.
【００２６】したがって、本発明のアレイ格子型光合分
波器は、光波長多重あるいは光周波数多重を用いた大容
量・長距離光通信に極めて有用な素子として利用するこ
とができる。Therefore, the array grating type optical multiplexer / demultiplexer of the present invention can be used as an extremely useful element for large capacity / long distance optical communication using optical wavelength multiplexing or optical frequency multiplexing.
【図１】第１実施例における第２の扇形スラブ導波路１
４の近傍の構造を示す拡大図。FIG. 1 is a second fan-shaped slab waveguide 1 according to the first embodiment.
The enlarged view which shows the structure of the vicinity of FIG.
【図２】第１実施例のアレイ格子型光合分波器の分波特
性の測定結果を示す図。FIG. 2 is a diagram showing measurement results of demultiplexing characteristics of the array grating type optical multiplexer / demultiplexer of the first embodiment.
【図３】第２実施例における第１の扇形スラブ導波路１
２および第２の扇形スラブ導波路１４の近傍の構造を示
す拡大図。FIG. 3 is a first fan-shaped slab waveguide 1 in the second embodiment.
The enlarged view which shows the structure of 2 and the 2nd fan-shaped slab waveguide 14 vicinity.
【図４】アレイ格子型光合分波器の基本構成を示す図。FIG. 4 is a diagram showing a basic configuration of an array grating type optical multiplexer / demultiplexer.
【図５】第２の扇形スラブ導波路１４の近傍の構造を示
す拡大図。5 is an enlarged view showing a structure in the vicinity of a second fan-shaped slab waveguide 14. FIG.
【図６】従来のアレイ格子型光合分波器の分波特性の測
定結果を示す図。FIG. 6 is a diagram showing measurement results of demultiplexing characteristics of a conventional array grating type optical multiplexer / demultiplexer.
１０ 基板 １１ 入力用チャネル導波路 １２ 第１の扇形スラブ導波路 １３ チャネル導波路アレイ １４ 第２の扇形スラブ導波路 １５ 出力用チャネル導波路 Reference Signs List 10 substrate 11 input channel waveguide 12 first fan-shaped slab waveguide 13 channel waveguide array 14 second fan-shaped slab waveguide 15 output channel waveguide
Claims (2)
力用チャネル導波路と、所定の導波路長差で順次長くな
る複数本の導波路からなるチャネル導波路アレイと、前
記入力用チャネル導波路と前記チャネル導波路アレイと
を接続する第１の扇形スラブ導波路と、前記チャネル導
波路アレイと前記出力用チャネル導波路とを接続する第
２の扇形スラブ導波路とを形成したアレイ格子型光合分
波器において、 前記入力用チャネル導波路と前記第１の扇形スラブ導波
路との境界における入力用チャネル導波路の間隔、また
は前記第２の扇形スラブ導波路と前記出力用チャネル導
波路との境界における出力用チャネル導波路の間隔の少
なくとも一方が不等間隔であることを特徴とするアレイ
格子型光合分波器。1. A channel waveguide array comprising an input channel waveguide, an output channel waveguide, and a plurality of waveguides that are sequentially lengthened by a predetermined waveguide length difference on a substrate, and the input channel. An array grating having a first fan-shaped slab waveguide that connects a waveguide and the channel waveguide array, and a second fan-shaped slab waveguide that connects the channel waveguide array and the output channel waveguide. Type optical multiplexer / demultiplexer, the interval between the input channel waveguides at the boundary between the input channel waveguides and the first fan-shaped slab waveguide, or the second fan-shaped slab waveguide and the output channel waveguide An array grating type optical multiplexer / demultiplexer, characterized in that at least one of the intervals of the output channel waveguides at the boundary with is unequal intervals.
力用チャネル導波路と、所定の導波路長差で順次長くな
る複数本の導波路からなるチャネル導波路アレイと、前
記入力用チャネル導波路と前記チャネル導波路アレイと
を接続する第１の扇形スラブ導波路と、前記チャネル導
波路アレイと前記出力用チャネル導波路とを接続する第
２の扇形スラブ導波路とを形成したアレイ格子型光合分
波器において、 前記入力用チャネル導波路と前記第１の扇形スラブ導波
路との境界における入力用チャネル導波路の間隔と、前
記第２の扇形スラブ導波路と前記出力用チャネル導波路
との境界における出力用チャネル導波路の間隔が異なる
ことを特徴とするアレイ格子型光合分波器。2. An input channel waveguide, an output channel waveguide, a channel waveguide array consisting of a plurality of waveguides that are sequentially elongated by a predetermined waveguide length difference, and the input channel on a substrate. An array grating having a first fan-shaped slab waveguide that connects a waveguide and the channel waveguide array, and a second fan-shaped slab waveguide that connects the channel waveguide array and the output channel waveguide. Type optical multiplexer / demultiplexer, the interval between the input channel waveguides at the boundary between the input channel waveguides and the first fan-shaped slab waveguide, the second fan-shaped slab waveguide, and the output channel waveguide An array grating type optical multiplexer / demultiplexer, characterized in that the intervals of the output channel waveguides at the boundary between and are different.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1823795A JP3247819B2 (en) | 1995-02-06 | 1995-02-06 | Array grating type optical multiplexer / demultiplexer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1823795A JP3247819B2 (en) | 1995-02-06 | 1995-02-06 | Array grating type optical multiplexer / demultiplexer |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001028768A Division JP3249960B2 (en) | 2001-02-05 | 2001-02-05 | Array grating type optical multiplexer / demultiplexer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08211237A true JPH08211237A (en) | 1996-08-20 |
| JP3247819B2 JP3247819B2 (en) | 2002-01-21 |
Family
ID=11966080
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1823795A Expired - Lifetime JP3247819B2 (en) | 1995-02-06 | 1995-02-06 | Array grating type optical multiplexer / demultiplexer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3247819B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6334014B1 (en) | 1998-11-02 | 2001-12-25 | Canon Kabushiki Kaisha | Optical fiber apparatus provided with demultiplexing/multiplexing unit on fiber's end portion, optical detecting apparatus provided with demultiplexing/multiplexing unit on its light receiving surface, and optical transmission system using the same |
| KR100450324B1 (en) * | 1997-12-30 | 2005-04-06 | 삼성전자주식회사 | Optical Wavelength Multiplexer / Splitter with Flat Frequency Response |
| US7324756B2 (en) | 2002-04-08 | 2008-01-29 | Sumitomo Electric Industries, Ltd. | Optical demultiplexer and optical transmission system |
| JP2009229718A (en) * | 2008-03-21 | 2009-10-08 | Nippon Telegr & Teleph Corp <Ntt> | Optical wavelength group multiplex/demultiplex circuit |
-
1995
- 1995-02-06 JP JP1823795A patent/JP3247819B2/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100450324B1 (en) * | 1997-12-30 | 2005-04-06 | 삼성전자주식회사 | Optical Wavelength Multiplexer / Splitter with Flat Frequency Response |
| US6334014B1 (en) | 1998-11-02 | 2001-12-25 | Canon Kabushiki Kaisha | Optical fiber apparatus provided with demultiplexing/multiplexing unit on fiber's end portion, optical detecting apparatus provided with demultiplexing/multiplexing unit on its light receiving surface, and optical transmission system using the same |
| US7324756B2 (en) | 2002-04-08 | 2008-01-29 | Sumitomo Electric Industries, Ltd. | Optical demultiplexer and optical transmission system |
| JP2009229718A (en) * | 2008-03-21 | 2009-10-08 | Nippon Telegr & Teleph Corp <Ntt> | Optical wavelength group multiplex/demultiplex circuit |
| JP4608647B2 (en) * | 2008-03-21 | 2011-01-12 | 日本電信電話株式会社 | Optical wavelength group multiplexing / demultiplexing circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3247819B2 (en) | 2002-01-21 |
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