JPH11271817A - Optical filter - Google Patents
Optical filterInfo
- Publication number
- JPH11271817A JPH11271817A JP7046498A JP7046498A JPH11271817A JP H11271817 A JPH11271817 A JP H11271817A JP 7046498 A JP7046498 A JP 7046498A JP 7046498 A JP7046498 A JP 7046498A JP H11271817 A JPH11271817 A JP H11271817A
- Authority
- JP
- Japan
- Prior art keywords
- optical
- terminal
- demultiplexer
- optical filter
- multiplexer
- 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.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、波長多重された信
号光の中から所望の波長の信号光を選択する光フィルタ
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical filter for selecting a signal light having a desired wavelength from wavelength-multiplexed signal lights.
【０００２】[0002]
【従来の技術】波長多重を利用したシステムにおいて
は、多重化された信号光の中から所望の波長の信号光を
選択する光フィルタが必要である。また分配選択型の波
長多重ネットワークにおいては、受信チャネルを切り替
える必要があるので、光フィルタには選択波長の切り替
え動作が要求される。さらに、光伝送に限らず、波長多
重技術を利用した信号処理、例えば光ＡＴＭ（非同期転
送モード）交換機等においても高速に選択波長を切り替
えることのできる光フィルタが要求される。2. Description of the Related Art In a system utilizing wavelength multiplexing, an optical filter for selecting signal light having a desired wavelength from multiplexed signal light is required. In a distribution-selection-type wavelength division multiplexing network, it is necessary to switch a receiving channel, and thus an optical filter is required to perform a switching operation of a selected wavelength. Furthermore, not only optical transmission, but also signal processing utilizing wavelength multiplexing technology, for example, an optical ATM (asynchronous transfer mode) switch, requires an optical filter capable of switching the selected wavelength at high speed.
【０００３】このような要求に応える光フィルタとして
は例えばファブリペロー共振器の共振器長を圧電素子等
により変化させて選択波長を切り替えるチューナブルな
ファブリペローフィルタ等が実用化されているが、切り
替え速度が遅いので用途によっては適用できないことが
ある。[0003] As an optical filter that meets such a demand, for example, a tunable Fabry-Perot filter that switches a selected wavelength by changing the resonator length of a Fabry-Perot resonator with a piezoelectric element or the like has been put into practical use. Due to the low speed, it may not be applicable depending on the application.
【０００４】そこで、高速に切り替え可能で選択波長帯
域が広い光フィルタとして図４に示すような光フィルタ
が提案されている。Therefore, an optical filter as shown in FIG. 4 has been proposed as an optical filter which can be switched at a high speed and has a wide selection wavelength band.
【０００５】図４は光フィルタの従来例を示すブロック
図である。FIG. 4 is a block diagram showing a conventional example of an optical filter.
【０００６】波長多重され矢印１方向に進む入力信号光
は、分波用の光合分波器２により各波長（λ1 〜λN ）
ごとに分波され、分波された各信号光は各光ゲート３−
１〜３−Ｎを経て合波用の光合分波器４により合波され
て矢印５方向に出力される。光ゲート３−１〜３−Ｎに
より所望の波長の信号光のみを通過させることにより信
号光の波長の選択や切り替えが可能になる。光ゲート３
−１〜３−Ｎとして、化合物半導体を材料とする電界吸
収型変調器或いはレーザ増幅型変調器等を用いれば、高
速のオンオフが可能なので高速の波長切り替えを実現で
きる。The input signal light which is wavelength-multiplexed and travels in the direction of arrow 1 has respective wavelengths (λ 1 to λ N ) by an optical multiplexer / demultiplexer 2 for demultiplexing.
Each signal light is demultiplexed for each of the optical gates 3-
The light is multiplexed by an optical multiplexer / demultiplexer 4 for multiplexing via 1-3-N and output in the direction of arrow 5. By allowing only the signal light of a desired wavelength to pass through the optical gates 3-1 to 3-N, the wavelength of the signal light can be selected or switched. Light gate 3
If an electroabsorption modulator or a laser amplification modulator using a compound semiconductor as a material is used as -1 to 3-N, high-speed switching can be realized since high-speed on / off is possible.
【０００７】[0007]
【発明が解決しようとする課題】ところで、図４に示し
た従来の光フィルタは、高速に切り替え可能でしかも選
択波長帯域の広い光フィルタを実現できるが、分波用の
光合分波器と合波用の光合分波器との合分波特性が揃っ
ていないと、各波長チャネルの通過波長帯域が狭かった
り、過剰損失やクロストークを生じたりするおそれがあ
る。By the way, the conventional optical filter shown in FIG. 4 can realize an optical filter which can be switched at high speed and has a wide selection wavelength band. However, the conventional optical filter can be combined with an optical multiplexer / demultiplexer for demultiplexing. If the multiplexing / demultiplexing characteristics with the optical multiplexer / demultiplexer for waves are not uniform, there is a possibility that the passing wavelength band of each wavelength channel is narrow, excessive loss or crosstalk occurs.
【０００８】また、光合分波器や光ゲートの偏波依存損
失の影響により、出力レベルが変動するというという問
題があった。Another problem is that the output level fluctuates due to the influence of the polarization dependent loss of the optical multiplexer / demultiplexer and the optical gate.
【０００９】そこで、本発明の目的は上記課題を解決
し、高速切り替えが可能で、選択波長帯域が広く、しか
も出力レベルが安定した光フィルタを提供することにあ
る。An object of the present invention is to solve the above-mentioned problems and to provide an optical filter capable of high-speed switching, having a wide selection wavelength band, and having a stable output level.
【００１０】[0010]
【課題を解決するための手段】上記目的を達成するため
に本発明は、端子Ａから端子Ｂ、端子Ｂから端子Ｃへの
順方向特性を有する光サーキュレータの端子Ｂに光合分
波器の共通入出力端子を接続し、光合分波器の各個別入
出力端子に光ゲートを介して反射器をそれぞれ接続する
ことにより、多重化された信号光を端子Ａに入力すると
所望の波長の信号光を端子Ｃに出力するものである。SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to an optical multiplexing / demultiplexing device which is connected to a terminal B of an optical circulator having a forward characteristic from a terminal A to a terminal B and from a terminal B to a terminal C. By connecting the input / output terminals and connecting the reflectors to the individual input / output terminals of the optical multiplexer / demultiplexer via optical gates, respectively, when the multiplexed signal light is input to the terminal A, the signal light having a desired wavelength is obtained. Is output to a terminal C.
【００１１】上記構成に加え本発明の光フィルタの光反
射器は、４５度回転のファラデー素子を内蔵するファラ
デーローテーターミラーであってもよい。In addition to the above configuration, the light reflector of the optical filter of the present invention may be a Faraday rotator mirror having a built-in Faraday element rotated by 45 degrees.
【００１２】上記構成に加え本発明の光フィルタの光合
分波器の各個別入出力端子と光反射器との間に光減衰器
を設けてもよい。In addition to the above configuration, an optical attenuator may be provided between each individual input / output terminal of the optical multiplexer / demultiplexer of the optical filter of the present invention and the optical reflector.
【００１３】上記構成に加え本発明の光フィルタの光合
分波器の各個別入出力端子と光反射器との間に光遅延微
調器を設けてもよい。In addition to the above configuration, an optical delay fine adjuster may be provided between each individual input / output terminal of the optical multiplexer / demultiplexer of the optical filter of the present invention and the optical reflector.
【００１４】上記構成に加え本発明の光フィルタの光サ
ーキュレータの端子Ｂと光合分波器の共通入出力端子と
の間に、希土類添加光ファイバと、励起光及び信号光の
合波用の光合波器とを挿入し、光合波器に励起光源を接
続してもよい。In addition to the above configuration, a rare-earth-doped optical fiber and an optical coupler for multiplexing pump light and signal light are provided between the terminal B of the optical circulator of the optical filter of the present invention and the common input / output terminal of the optical multiplexer / demultiplexer. A pump may be inserted into the optical multiplexer to connect the excitation light source.
【００１５】上記構成に加え本発明の光合分波器は基板
上に形成された導波路アレイ格子を用いた集積化光合分
波器であってもよい。In addition to the above configuration, the optical multiplexer / demultiplexer of the present invention may be an integrated optical multiplexer / demultiplexer using a waveguide array grating formed on a substrate.
【００１６】本発明によれば、光フィルタを光サーキュ
レータと、光合分波器と、反射器とを用いた反射型構成
にすることにより、光合分波器が１台ですむ。このため
複数の光合波器を用いることによる特性の偏差がなくな
り、出力レベルが安定なフィルタ特性を有することがで
き、偏波依存性が小さくなる。しかも波長切り替え速度
が低下したり波長選択帯域が狭くなることがない。ま
た、反射器にファラデーローテーターミラーを用いるこ
とにより、使用素子の偏波依存性の影響を相殺すること
ができる。According to the present invention, a single optical multiplexer / demultiplexer is required by using an optical filter of a reflection type using an optical circulator, an optical multiplexer / demultiplexer, and a reflector. For this reason, there is no deviation in characteristics due to the use of a plurality of optical multiplexers, the output level can have a stable filter characteristic, and the polarization dependence is reduced. Moreover, the wavelength switching speed is not reduced and the wavelength selection band is not narrowed. In addition, by using a Faraday rotator mirror for the reflector, it is possible to cancel out the influence of the polarization dependence of the element used.
【００１７】[0017]
【発明の実施の形態】以下、本発明の実施の形態を添付
図面に基づいて詳述する。Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
【００１８】図１は本発明の光フィルタの一実施の形態
を示すブロック図である。FIG. 1 is a block diagram showing one embodiment of the optical filter of the present invention.
【００１９】この光フィルタは、端子Ａから端子Ｂ、端
子Ｂから端子Ｃへの順方向特性を有する光サーキュレー
タ１０の端子Ｂに光合分波器１１の共通入出力端子が接
続され、光合分波器１１の各個別入出力端子に光ゲート
１２（１２−１〜１２−Ｎ）を介して光反射器１３（１
３−１〜１３−Ｎ）がそれぞれ接続されたものである。In this optical filter, a common input / output terminal of an optical multiplexer / demultiplexer 11 is connected to a terminal B of an optical circulator 10 having a forward characteristic from a terminal A to a terminal B and from a terminal B to a terminal C. The light reflector 13 (1) is connected to each individual input / output terminal of the light reflector 11 via the optical gate 12 (12-1 to 12-N).
3-1 to 13-N) are connected.
【００２０】このような構成において、光サーキュレー
タ１０の端子Ａに矢印１４方向に進む信号光が入力され
ると、信号光は端子Ａから端子Ｂに至り、光合分波器１
１により分波された後にいずれかの光ゲート１２を通過
し、光反射器１３により反射され再び同じ光路をたどっ
て光サーキュレータ１０の端子Ｂから端子Ｃに出力され
矢印１５方向に進む。In such a configuration, when the signal light traveling in the direction of arrow 14 is input to the terminal A of the optical circulator 10, the signal light travels from the terminal A to the terminal B, and the optical multiplexer / demultiplexer 1
After being demultiplexed by 1, the light passes through any one of the optical gates 12, is reflected by the light reflector 13, and follows the same optical path again to be output from the terminal B to the terminal C of the optical circulator 10 and travels in the direction of arrow 15.
【００２１】すなわち、この光フィルタは、光合分波器
１１における所望の波長の個別入出力端子側の光ゲート
１２をオン状態にすることにより、該当する波長の信号
のみが光サーキュレータ１０の端子Ｃから出力されるの
である。In other words, this optical filter turns on the optical gate 12 on the individual input / output terminal side of the desired wavelength in the optical multiplexer / demultiplexer 11, so that only the signal of the corresponding wavelength becomes the terminal C of the optical circulator 10. It is output from.
【００２２】このような構成により、信号光の分波と、
光ゲート１２による選択後の合波とが１台の光合分波器
１１により行われるので、従来構成のように２台の光合
分波器の偏差を考慮する必要がない。With such a configuration, the demultiplexing of the signal light,
Since the multiplexing after the selection by the optical gate 12 is performed by one optical multiplexer / demultiplexer 11, there is no need to consider the deviation between the two optical multiplexers / demultiplexers unlike the conventional configuration.
【００２３】また光反射器１３を、内部に４５度回転の
ファラデー素子を内蔵するファラデーローテーターミラ
ーとすることにより、光合分波器１１及び光ゲート１２
を通過する信号光の偏波状態が、往路と復路とで互いに
直交状態となるので、各素子１０〜１３に偏波依存性損
失があったとしても、各素子１０〜１３に信号光を往復
通過させることにより偏波依存性の損失が相殺される。The light reflector 13 is a Faraday rotator mirror having a 45-degree rotating Faraday element inside, so that the optical multiplexer / demultiplexer 11 and the optical gate 12
The polarization state of the signal light passing through is orthogonal to each other in the forward path and the return path. Therefore, even if each of the elements 10 to 13 has a polarization-dependent loss, the signal light is reciprocated to each of the elements 10 to 13. Passing cancels out polarization dependent losses.
【００２４】図２は本発明の光フィルタの他の実施の形
態を示すブロック図である。FIG. 2 is a block diagram showing another embodiment of the optical filter of the present invention.
【００２５】図１に示した光フィルタとの相違点は、光
合分波器１１の各個別入出力端子と光ゲート１２−１〜
１２−Ｎとの間に、光減衰器１６（１６−１〜１６−
Ｎ）及び遅延微調器１７（１７−１〜１７−Ｎ）を設け
た点である。The difference from the optical filter shown in FIG. 1 is that the individual input / output terminals of the optical multiplexer / demultiplexer 11 and the optical gates 12-1 to 12-1.
12-N, the optical attenuator 16 (16-1 to 16-
N) and the delay fine adjuster 17 (17-1 to 17-N).
【００２６】各分波パスに挿入された光減衰器１６は、
光合分波器１１及び光ゲート１２の挿入損失の波長依存
性を補償する。遅延微調器１７は各パスの遅延時間偏差
を補償する。このような構成においても図１に示した光
ファイバと同様に、光合分波器１１における所望の波長
の個別入出力端子側の光ゲート１２をオン状態にするこ
とにより、該当する波長の信号のみが光サーキュレータ
１０の端子Ｃから出力される。また、損失の波長依存性
や遅延時間の波長依存性を十分低減することができ、光
ＡＴＭ交換機のような精密な信号光処理を行う用途にも
十分適用可能になる。The optical attenuator 16 inserted in each demultiplexing path
The wavelength dependence of the insertion loss of the optical multiplexer / demultiplexer 11 and the optical gate 12 is compensated. The delay fine adjuster 17 compensates for the delay time deviation of each path. In such a configuration, as in the optical fiber shown in FIG. 1, by turning on the optical gate 12 on the individual input / output terminal side of the desired wavelength in the optical multiplexer / demultiplexer 11, only the signal of the corresponding wavelength is Is output from the terminal C of the optical circulator 10. Further, the wavelength dependency of the loss and the wavelength dependency of the delay time can be sufficiently reduced, and the present invention can be sufficiently applied to the use for performing a precise signal light processing such as an optical ATM exchange.
【００２７】さらにこの光フィルタにおける波長依存性
損失の補償機能や波長依存性遅延の補償機能は、光フィ
ルタ内部の特性の補償だけでなく、光フィルタの前後に
接続される機器や装置の特性を補償する用途に用いるこ
とができる。例えば、前後に接続される光ファイバ増幅
器の増幅利得の波長依存性や、前後に接続される各種素
子や光ファイバの波長分散特性による波長間の遅延偏差
を補償することができる。The function of compensating for the wavelength-dependent loss and the function of compensating for the wavelength-dependent delay in the optical filter not only compensates for the characteristics inside the optical filter, but also determines the characteristics of devices and devices connected before and after the optical filter. It can be used for compensation purposes. For example, it is possible to compensate for the wavelength dependence of the amplification gain of the optical fiber amplifiers connected before and after, and the delay deviation between wavelengths due to the wavelength dispersion characteristics of various elements and optical fibers connected before and after.
【００２８】図３は本発明の光フィルタの他の実施の形
態を示すブロック図である。FIG. 3 is a block diagram showing another embodiment of the optical filter of the present invention.
【００２９】図１に示した光フィルタとの相違点は、光
サーキュレータ１０の端子Ｂと、光合分波器１１の共通
端子との間に、希土類添加光ファイバ１８と、励起光及
び信号光の合波用の光合波器１９とを挿入し、光合波器
１９に励起光源２０を接続した点である。すなわち、こ
の光フィルタは、光ファイバ増幅器を内蔵させて内部の
損失補償を図ったものである。基本構成は図１に示した
光フィルタと同様なので重複する説明は省略する。The optical filter shown in FIG. 1 is different from the optical filter shown in FIG. 1 in that a rare-earth-doped optical fiber 18, a pump light and a signal light are provided between a terminal B of the optical circulator 10 and a common terminal of the optical multiplexer / demultiplexer 11. The point is that an optical multiplexer 19 for multiplexing is inserted, and an excitation light source 20 is connected to the optical multiplexer 19. That is, this optical filter has a built-in optical fiber amplifier to compensate for internal loss. The basic configuration is the same as that of the optical filter shown in FIG.
【００３０】このような構成においても、信号光が、励
起された希土類添加光ファイバを通過することにより増
幅されるので、光合分波器や光ゲートの挿入損失を補償
することができる。また、信号光は増幅媒体を往復通過
するので、増幅効率が高いという利点がある。さらに、
通常の光ファイバ増幅器では入出力側に光アイソレータ
を設けて発振等の不安定動作を回避する必要があるが、
本構成では光サーキュレータが増幅器の入出力のアイソ
レータの役割も果たすので、構成部品が少なくてすむと
いう利点もある。Also in such a configuration, since the signal light is amplified by passing through the pumped rare earth doped optical fiber, the insertion loss of the optical multiplexer / demultiplexer or the optical gate can be compensated. In addition, since the signal light reciprocates through the amplification medium, there is an advantage that the amplification efficiency is high. further,
In ordinary optical fiber amplifiers, it is necessary to provide optical isolators on the input and output sides to avoid unstable operation such as oscillation.
In this configuration, since the optical circulator also plays the role of an isolator for input and output of the amplifier, there is an advantage that the number of components can be reduced.
【００３１】またさらに図２に示した光フィルタと図３
に示した光フィルタとを組み合わせて光増幅器と光減衰
器と遅延微調器と有する光フィルタを構成してもよい。
また図１〜図３に示した光フィルタの光合分波器を、基
板上に形成された導波路アレイ格子を用いた集積化光合
分波器としてもよい。Further, the optical filter shown in FIG.
May be combined to form an optical filter having an optical amplifier, an optical attenuator, and a delay fine adjuster.
Further, the optical multiplexer / demultiplexer of the optical filter shown in FIGS. 1 to 3 may be an integrated optical multiplexer / demultiplexer using a waveguide array grating formed on a substrate.
【００３２】以上において本発明によれば、 (1) 光フィルタを反射型構成とすることにより、信号光
の分波と合波とが同一の光合分波器により行われるの
で、従来のように分波用の光合分波器の特性と合波用の
光合分波器の特性とのずれによるフィルタ特性の劣化が
ない。As described above, according to the present invention, (1) the demultiplexing and multiplexing of signal light are performed by the same optical multiplexer / demultiplexer by using an optical filter of a reflection type configuration. There is no deterioration in filter characteristics due to a difference between the characteristics of the optical multiplexer / demultiplexer for demultiplexing and the characteristics of the optical multiplexer / demultiplexer for demultiplexing.
【００３３】(2) 光合分波器が１台ですむので、光フィ
ルタの小形化、低コスト化が可能である。(2) Since only one optical multiplexer / demultiplexer is required, the size and cost of the optical filter can be reduced.
【００３４】(3) 光フィルタの光反射器にファラデーロ
ーテーターミラーを用いることにより、光合分波器や光
ゲートを通過する信号光の偏波状態が往路と復路とで直
交状態となるので、各素子の偏波依存性損失が相殺され
る。(3) By using a Faraday rotator mirror for the optical reflector of the optical filter, the polarization state of the signal light passing through the optical multiplexer / demultiplexer or the optical gate becomes orthogonal between the forward path and the return path. The polarization dependent loss of the element is canceled.
【００３５】(4) 光フィルタの各分波パスに光減衰器を
挿入することにより、波長依存性損失を補償することが
でき、遅延微調器を挿入することにより、波長依存性遅
延（波長分散）を補償することもできる。(4) A wavelength-dependent loss can be compensated by inserting an optical attenuator in each demultiplexing path of the optical filter, and a wavelength-dependent delay (wavelength dispersion ) Can also be compensated.
【００３６】(5) 光フィルタには高効率の反射型光増幅
器を内蔵することができる。その際、光アイソレータは
不要であるので、少ない構成部品で実現することができ
る。(5) A high-efficiency reflection type optical amplifier can be built in the optical filter. In this case, since an optical isolator is not required, it can be realized with a small number of components.
【００３７】[0037]
【発明の効果】以上要するに本発明によれば、次のよう
な優れた効果を発揮する。In summary, according to the present invention, the following excellent effects are exhibited.
【００３８】光サーキュレータと、光合分波器と、反射
器とを用いた反射型構成とすることにより、高速切り替
えが可能で、選択波長帯域が広く、しかも出力レベルが
安定した光フィルタの提供を実現することができる。By providing a reflection type configuration using an optical circulator, an optical multiplexer / demultiplexer, and a reflector, it is possible to provide an optical filter capable of high-speed switching, having a wide selection wavelength band, and having a stable output level. Can be realized.
【図１】本発明の光フィルタの一実施の形態を示すブロ
ック図である。FIG. 1 is a block diagram showing one embodiment of an optical filter of the present invention.
【図２】本発明の光フィルタの他の実施の形態を示すブ
ロック図である。FIG. 2 is a block diagram showing another embodiment of the optical filter of the present invention.
【図３】本発明の光フィルタの他の実施の形態を示すブ
ロック図である。FIG. 3 is a block diagram showing another embodiment of the optical filter of the present invention.
【図４】光フィルタの従来例を示すブロック図である。FIG. 4 is a block diagram showing a conventional example of an optical filter.
１０ 光サーキュレータ １１ 光合分波器 １２ 光ゲート １３ 光反射器 Reference Signs List 10 optical circulator 11 optical multiplexer / demultiplexer 12 optical gate 13 optical reflector
Claims (6)
の順方向特性を有する光サーキュレータの端子Ｂに光合
分波器の共通入出力端子を接続し、該光合分波器の各個
別入出力端子に光ゲートを介して反射器をそれぞれ接続
することにより、多重化された信号光を端子Ａに入力す
ると所望の波長の信号光を端子Ｃに出力することを特徴
とする光フィルタ。1. A common input / output terminal of an optical multiplexer / demultiplexer is connected to a terminal B of an optical circulator having a forward characteristic from a terminal A to a terminal B and from a terminal B to a terminal C. An optical filter characterized in that a multiplexed signal light is input to a terminal A and a signal light of a desired wavelength is output to a terminal C by connecting a reflector to each of the input / output terminals via an optical gate.
ー素子を内蔵するファラデーローテーターミラーである
請求項１に記載の光フィルタ。2. The optical filter according to claim 1, wherein the light reflector is a Faraday rotator mirror having a built-in Faraday element rotated by 45 degrees.
反射器との間に光減衰器を設けた請求項１または２に記
載の光フィルタ。3. The optical filter according to claim 1, wherein an optical attenuator is provided between each individual input / output terminal of the optical multiplexer / demultiplexer and the optical reflector.
反射器との間に光遅延微調器を設けた請求項１または２
に記載の光フィルタ。4. An optical delay fine adjuster is provided between each individual input / output terminal of the optical multiplexer / demultiplexer and an optical reflector.
An optical filter according to claim 1.
合分波器の共通入出力端子との間に、希土類添加光ファ
イバと、励起光及び信号光の合波用の光合波器とを挿入
し、光合波器に励起光源を接続した請求項１から４のい
ずれかに記載の光フィルタ。5. A rare earth-doped optical fiber and an optical multiplexer for multiplexing pump light and signal light are inserted between a terminal B of the optical circulator and a common input / output terminal of the optical multiplexer / demultiplexer. 5. The optical filter according to claim 1, wherein an excitation light source is connected to the optical multiplexer.
波路アレイ格子を用いた集積化光合分波器である請求項
１から５のいずれかに記載の光フィルタ。6. The optical filter according to claim 1, wherein the optical multiplexer / demultiplexer is an integrated optical multiplexer / demultiplexer using a waveguide array grating formed on a substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07046498A JP3552527B2 (en) | 1998-03-19 | 1998-03-19 | Optical filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07046498A JP3552527B2 (en) | 1998-03-19 | 1998-03-19 | Optical filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11271817A true JPH11271817A (en) | 1999-10-08 |
| JP3552527B2 JP3552527B2 (en) | 2004-08-11 |
Family
ID=13432281
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07046498A Expired - Fee Related JP3552527B2 (en) | 1998-03-19 | 1998-03-19 | Optical filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3552527B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6304380B1 (en) * | 2000-03-06 | 2001-10-16 | Lucent Technologies Inc. | Reducing polarization dependency of optical apparatus |
| JP2002543477A (en) * | 1999-04-30 | 2002-12-17 | テレフオンアクチーボラゲツト エル エム エリクソン（パブル） | Optical wavelength filtering apparatus and method |
| KR100462470B1 (en) * | 2002-06-05 | 2004-12-17 | 한국전자통신연구원 | Wavelength selector to be used in wavelength division multiplexed networks |
| US6920261B2 (en) | 2000-12-13 | 2005-07-19 | Nec Corporation | Cross phase modulation suppressing device in wavelength division multiplexing optical transmission system and optical communication system |
| EP3483646A4 (en) * | 2016-08-31 | 2019-07-24 | Huawei Technologies Co., Ltd. | Optical signal processing method and optical device |
-
1998
- 1998-03-19 JP JP07046498A patent/JP3552527B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002543477A (en) * | 1999-04-30 | 2002-12-17 | テレフオンアクチーボラゲツト エル エム エリクソン（パブル） | Optical wavelength filtering apparatus and method |
| US6304380B1 (en) * | 2000-03-06 | 2001-10-16 | Lucent Technologies Inc. | Reducing polarization dependency of optical apparatus |
| US6920261B2 (en) | 2000-12-13 | 2005-07-19 | Nec Corporation | Cross phase modulation suppressing device in wavelength division multiplexing optical transmission system and optical communication system |
| KR100462470B1 (en) * | 2002-06-05 | 2004-12-17 | 한국전자통신연구원 | Wavelength selector to be used in wavelength division multiplexed networks |
| EP3483646A4 (en) * | 2016-08-31 | 2019-07-24 | Huawei Technologies Co., Ltd. | Optical signal processing method and optical device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3552527B2 (en) | 2004-08-11 |
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