JPH0451114A - Optical wavelength filter - Google Patents
Optical wavelength filterInfo
- Publication number
- JPH0451114A JPH0451114A JP16010490A JP16010490A JPH0451114A JP H0451114 A JPH0451114 A JP H0451114A JP 16010490 A JP16010490 A JP 16010490A JP 16010490 A JP16010490 A JP 16010490A JP H0451114 A JPH0451114 A JP H0451114A
- Authority
- JP
- Japan
- Prior art keywords
- polarized light
- optical waveguide
- center
- output end
- light
- 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
- 230000003287 optical effect Effects 0.000 title claims abstract description 49
- 230000005284 excitation Effects 0.000 claims description 12
- 239000000758 substrate Substances 0.000 claims description 9
- 230000002238 attenuated effect Effects 0.000 claims description 3
- 230000005684 electric field Effects 0.000 claims description 3
- 230000003993 interaction Effects 0.000 abstract description 13
- 230000005540 biological transmission Effects 0.000 abstract description 8
- 230000008859 change Effects 0.000 abstract description 5
- 230000000737 periodic effect Effects 0.000 abstract description 5
- 238000010897 surface acoustic wave method Methods 0.000 abstract description 5
- 230000010287 polarization Effects 0.000 description 22
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 15
- 229910052719 titanium Inorganic materials 0.000 description 15
- 239000010936 titanium Substances 0.000 description 15
- 238000006243 chemical reaction Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 238000004458 analytical method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 description 5
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000005711 Benzoic acid Substances 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 235000010233 benzoic acid Nutrition 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/11—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves
- G02F1/125—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves in an optical waveguide structure
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は光波長フィルタに関し、特にコリニア結合によ
る音響光学効果を用いた光波長フィルタに関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an optical wavelength filter, and particularly to an optical wavelength filter using an acousto-optic effect due to collinear coupling.
音響光学効果を用いた光波長フィルタは同調可変幅が大
きく、複数波長を選択できるなどの特徴がある。透過帯
域の半値全幅（Δλ３ｄＢ）は光波と音波の相互作用長
により決定する６透過帯域の狭帯域化は相互作用長の増
加、偏光変換素子の多段構成などにより行・つ。Optical wavelength filters using the acousto-optic effect have a wide tuning range and are capable of selecting multiple wavelengths. The full width at half maximum (Δλ3 dB) of the transmission band is determined by the interaction length between light waves and sound waves.6 Narrowing of the transmission band is achieved by increasing the interaction length, multi-stage configuration of polarization conversion elements, etc.
従来の技術としては、以下に挙げる例がある。Examples of conventional techniques are listed below.
第４図はエレクトロニクス・レター第２５巻６号３９８
〜３９９頁（ＥＬＥＣＴＲＯＮＩＣ８ＬＥＴＴＥＲ８Ｖ
ｏ１．２５ Ｎｏ、６．ｐｐ３９８−３９９．１９８９
）より引用した光波長フィルタである。ニオブ酸リチウ
ム基板１に作製されたチタン拡散光導波路２上に装荷さ
れた第一の表面波励振用電極４４ａにより表面弾性波に
よって、相互作用領域７４ａの光導波路に対して周期的
な屈折率変化が生じる。入力端で励起された、基板に対
して垂直な電界成分を有する直線偏光（以後ＴＭ偏光と
呼ぶ）の中で光導波路の周期的な屈折率変化により位相
整合条件が満たされる特定波長のＴＭ偏ｆ−が 基板に
対して平行な電界成分を有する直線偏光（以後ＴＥ偏光
と呼ぶ）に変換される。後段のＺカットのニオブ酸リチ
ウムウェハー片によるＴＥ偏光検光素子５４によりＴＥ
偏光は透過、ＴＭ偏先は放射されて特定波長の選択が行
える。第二の表面波励振用電極４４ｂにより相互作用領
域７４ｂで再度特定波長のＴＥ偏光が７Ｍ偏光に変換さ
れる。二段回の偏光変換によってフィルタ光の透過特性
の改善がはかられている。Figure 4 is Electronics Letter Vol. 25 No. 6 398
~399 pages (ELECTRONIC8LETTER8V
o1.25 No, 6. pp398-399.1989
This is an optical wavelength filter quoted from ). The first surface wave excitation electrode 44a loaded on the titanium diffused optical waveguide 2 fabricated on the lithium niobate substrate 1 causes a periodic refractive index change for the optical waveguide in the interaction region 74a by surface acoustic waves. occurs. TM polarization of a specific wavelength that satisfies the phase matching condition due to periodic changes in the refractive index of the optical waveguide in linearly polarized light (hereinafter referred to as TM polarized light) that is excited at the input end and has an electric field component perpendicular to the substrate. f- is converted into linearly polarized light (hereinafter referred to as TE polarized light) having an electric field component parallel to the substrate. TE is detected by the TE polarization analysis element 54 using a Z-cut lithium niobate wafer piece in the latter stage.
Polarized light is transmitted, and TM polarized light is emitted, allowing selection of a specific wavelength. The TE polarized light of the specific wavelength is again converted into 7M polarized light in the interaction region 74b by the second surface wave excitation electrode 44b. The two-stage polarization conversion improves the transmission characteristics of the filtered light.
第４図の光波長フィルタは透過帯域幅の狭帯域化とサイ
ドロープを抑圧するためＴＥ／ＴＭｉ光変換素子を二段
に設けている。そのことにより、同一デバイス長・電極
−段の光波長フィルタと比較して印加電力が増加してい
る。印加電力の低減は素子の実用化を図る上で重要な項
目である。また、非フィルタ光を除去するための検光素
子作製の工程が必要である、薄膜プロセスを利用できな
いため工数がかかる等の問題がある。さらに、非フィル
タ光の取り出しができないため、使用用途が限定される
欠点がある。The optical wavelength filter shown in FIG. 4 has two stages of TE/TMi optical conversion elements in order to narrow the transmission bandwidth and suppress side lobes. As a result, the applied power is increased compared to an optical wavelength filter having the same device length and electrode stages. Reducing the applied power is an important item in putting the device into practical use. Further, there are other problems, such as the need for a process for producing an analyzing element to remove unfiltered light, and the inability to use a thin film process, which requires a lot of man-hours. Furthermore, since it is not possible to extract unfiltered light, there is a drawback that the usage is limited.
本発明は２つある。第１の発明の光波長フィルタは、光
導波路の入力端と出力端の中央付近の光導波路上にバッ
ファ層を介して表面波励振用電極を設け、中央付近と出
力端付近に互いに直交する直線偏光を分離する素子を有
する構成である。The present invention has two aspects. In the optical wavelength filter of the first invention, a surface wave excitation electrode is provided on the optical waveguide near the center of the input end and the output end of the optical waveguide via a buffer layer, and straight lines orthogonal to each other are provided near the center and near the output end. This configuration includes an element that separates polarized light.
第２の発明の光波長フィルタは、７Ｍ偏光が充分に減衰
するように光導波路上に直接装荷した表面波励振用電極
を入力端と出力端の中央付近に設け、出力端付近に互い
に直交する直線偏光を分離する素子を有する構成である
。In the optical wavelength filter of the second invention, surface wave excitation electrodes directly loaded on the optical waveguide are provided near the center of the input end and the output end so that the 7M polarized light is sufficiently attenuated, and electrodes for surface wave excitation are provided near the center of the input end and the output end, and the electrodes are arranged orthogonally to each other near the output end. This configuration includes an element that separates linearly polarized light.
第１の発明では一つの表面波励振用電極の両側からの出
力を用いることにより３ｄＢの挿入損失が無くなり、一
つの電極で二段の偏光変換を行うことができることから
、従来の技術と同等のフィルタ透過特性の改善を低印加
電力で行うことができる。In the first invention, by using outputs from both sides of one surface wave excitation electrode, 3 dB insertion loss is eliminated, and two-stage polarization conversion can be performed with one electrode, so it is equivalent to the conventional technology. Filter transmission characteristics can be improved with low applied power.
第２の発明では表面波励振用電極により７Ｍ偏光の減衰
、ＴＥ偏光の透過を行うことにより、検光素子の作製工
程の省略、光波長フィルタの構成の簡略化を図ることが
できる。In the second invention, by attenuating the 7M polarized light and transmitting the TE polarized light using the surface wave excitation electrode, it is possible to omit the manufacturing process of the analyzing element and simplify the configuration of the optical wavelength filter.
次に本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.
第１図は第１の発明の詳細な説明するための平面図であ
る。ニオブ酸リチウム基板を用いた場合を例にとる。Ｘ
カットＹ軸伝搬ニオブ酸リチウム基板１の上に導波路幅
６〜１０μｍ、膜厚４００〜６００人のチタンストライ
プを形成し、９５０〜１１００℃で熱拡散を行い単一モ
ードチタン拡散光導波路２を作製する。フォトリソグラ
フィ法を用いて電極指周期１０〜５０μｍの原状の電極
４を入力端と出力端の中央付近のバッファ層３上に作製
する。電極４の両方向に励起された表面弾性波１０によ
って相互作用領域７ａ、７ｂにおける光導波路に周期的
屈折率変化が生じる。FIG. 1 is a plan view for explaining the first invention in detail. Let us take as an example a case where a lithium niobate substrate is used. X
A titanium stripe with a waveguide width of 6 to 10 μm and a film thickness of 400 to 600 layers is formed on a cut Y-axis propagation lithium niobate substrate 1, and thermal diffusion is performed at 950 to 1100°C to form a single mode titanium diffused optical waveguide 2. Create. An original electrode 4 having an electrode finger pitch of 10 to 50 μm is fabricated on the buffer layer 3 near the center of the input end and the output end using a photolithography method. The surface acoustic waves 10 excited in both directions of the electrode 4 cause periodic refractive index changes in the optical waveguides in the interaction regions 7a and 7b.
相互作用領域７ａにおいて入力した特定波長のＴＥ偏光
は７Ｍ偏光に変換される。中央付近にＴＭ偏光検光素子
６を設けることで非フィルタ光（ＴＥ偏光）は放射、被
フィルタ光（７Ｍ偏光）は透過する。ＴＭ［光種光素子
６は安息香酸中に２００〜４００℃数十分浸しさらにア
ニールを行って形成したプロトン交換領域をチタン拡散
光導波路の両サイドに設けることにより作製できる。The TE polarized light of a specific wavelength input in the interaction region 7a is converted into 7M polarized light. By providing the TM polarization analyzer 6 near the center, unfiltered light (TE polarized light) is emitted and filtered light (7M polarized light) is transmitted. TM [Light seed optical device 6 can be manufactured by providing proton exchange regions on both sides of a titanium diffused optical waveguide, which are formed by immersing the device in benzoic acid at 200 to 400° C. for several minutes and then annealing.
チタン拡散による異常光線の表面屈折率変化：Δｎｅは
＋０．００２〜＋０．００４程度である。これに対し、
プロトン交換法で形成した場合はΔｎｅ＝＋ｏ、１２と
増加するなめ異常光線（ＴＥ偏光）の放射が生じる。透
過した特性波長のＴＭ１１光は相互作用領域７ｂにおい
て再度ＴＥ偏光に変換される。出力端付近に設けた表面
弾性波の吸収作用も兼用した金属膜（アルミニウム膜厚
４００〜６００人）装荷によるＴＥ（［１光検光素子５
より非フィルタ光（７Ｍ偏光）は減衰、被フィルタ光（
ＴＥ偏光）は透過して二段の偏光変換によるフィルタ光
が出力される。従来の電極−段でのサイドローブ抑圧比
−１０ｄＢが同一数の電極、同一印加電圧で一２０ｄＢ
に改善できている。The surface refractive index change of the extraordinary ray due to titanium diffusion: Δne is about +0.002 to +0.004. On the other hand,
When formed by the proton exchange method, a slanted extraordinary ray (TE polarized light) is emitted which increases as Δne=+o,12. The transmitted TM11 light having the characteristic wavelength is again converted into TE polarized light in the interaction region 7b. TE ([1 optical analysis element 5
The unfiltered light (7M polarization) is attenuated, and the filtered light (
(TE polarized light) is transmitted and filtered light resulting from two-stage polarization conversion is output. The sidelobe suppression ratio in the conventional electrode stage is -10 dB, but with the same number of electrodes and the same applied voltage, it is -20 dB.
This has been improved.
第２図は第２の発明の詳細な説明するための平面図であ
る。前述のチタン拡散光導波路と同様の工程で単一モー
ドチタン拡散光導波路２を作製する。電極４によって両
方向に励起された表面弾性波によって相互作用領域７ａ
の光導波路の周期的屈折率変化が起こり、入力した特定
波長のＴＭ偏光はＴＥ偏光に変換される。電極４を光導
波路上に直接装荷することにより、ＴＭ１１光の減衰、
ＴＥ偏光の透過を行うことができ、ＴＥ偏光検光素子と
して作用する。透過した特定波長のＴＥ偏光は相互作用
領域７ｂにおいて再度ＴＭ偏光に変換される。出力端付
近に前述したＴＭ偏光検光素子６を設けることで非フィ
ルタ光（ＴＥ（ｉｉ光）は放射、被フィルタ光（ＴＭ偏
光）は透過して出力される。FIG. 2 is a plan view for explaining the second invention in detail. A single mode titanium diffused optical waveguide 2 is fabricated using the same process as the titanium diffused optical waveguide described above. The interaction region 7a is generated by the surface acoustic waves excited in both directions by the electrode 4.
A periodic change in the refractive index of the optical waveguide occurs, and the input TM polarized light of a specific wavelength is converted into TE polarized light. By directly loading the electrode 4 on the optical waveguide, attenuation of the TM11 light,
It can transmit TE polarized light and acts as a TE polarized light analyzer. The transmitted TE polarized light of a specific wavelength is converted into TM polarized light again in the interaction region 7b. By providing the aforementioned TM polarization analyzer 6 near the output end, the unfiltered light (TE (ii light)) is emitted and the filtered light (TM polarized light) is transmitted and output.
第３図は第１の発明の第２の実施例を説明するための平
面図である。前述のチタン拡散光導波路と同様の工程で
分岐部分が入力端と出力端の中央付近にある単一モード
非対称Ｙ分岐型チタン拡散光導波路２３を作製する。分
岐部分に表面弾性波の伝搬を妨げないＴＥ／ＴＭ偏光分
離素子を設番フることにより、非フィルタ光の取り出し
が行える。−例としてプロトン交換領域を用いたＴＥ／
ＴＭ偏光分離素子を述べる。安息香酸中に２００〜４０
０℃数十分浸しさらにアニールを行って形成したプロト
ン交換領域８を、チタン拡散領域との境界が光波進行方
向に対して斜めになるように設ける。チタン拡散による
異常光線・常光線の表面屈折率変化：Δｎｅ Δｎ０は
、それぞれ＋０．００２〜＋０．００４程度であるこれ
に対し、プロトン変換法で形成した場合はΔｎ８−＋０
．００２、Δｎｏ ＝−０，０４と変化が大きいため、
チタン拡散光導波路とプロトン交換領域の境界面におい
て、常光線の全反射条件を満たず大きな入射角条件が存
在する。進入角１．３８ｒａｄ以上で被フィルタ光であ
る異常光線（ＴＥ偏光）は屈折・浸透をし、非フィルタ
光である異常光線（ＴＭ偏光）は全反射して分岐枝２３
ａへ出射し偏光分離と非フィルタ光の取り出しが行える
。透過した特定波長のＴＥ偏光は相互作用領域７ｂにお
いて再度ＴＭ偏光に変換される。出力端付近に前述した
ＴＭ偏光検光素子６を介して非フィルタ光（ＴＥ偏光）
は放射、被フィルタ光（ＴＭ偏光）は透過して二段の偏
光変換によるフィルタ光が出力される。FIG. 3 is a plan view for explaining the second embodiment of the first invention. A single mode asymmetrical Y-branch type titanium diffused optical waveguide 23 having a branch portion near the center between the input end and the output end is fabricated using the same process as that for the titanium diffused optical waveguide described above. By installing a TE/TM polarization separation element that does not interfere with the propagation of surface acoustic waves at the branching portion, unfiltered light can be taken out. - TE using proton exchange region as an example/
The TM polarization splitting element will be described. 200-40 in benzoic acid
A proton exchange region 8 formed by dipping at 0° C. for several minutes and then annealing is provided so that the boundary with the titanium diffusion region is oblique to the direction of light wave propagation. Changes in the surface refractive index of extraordinary rays and ordinary rays due to titanium diffusion: Δne Δn0 are about +0.002 to +0.004, respectively.On the other hand, when formed by the proton conversion method, Δn8−+0
．． 002, Δno = -0,04, which is a large change,
At the interface between the titanium diffused optical waveguide and the proton exchange region, there exists a large incident angle condition that does not satisfy the total reflection condition for ordinary rays. At an approach angle of 1.38 rad or more, the filtered extraordinary ray (TE polarized light) is refracted and penetrated, and the unfiltered extraordinary ray (TM polarized light) is totally reflected and passes through the branch 23.
The polarized light can be separated and the unfiltered light can be taken out. The transmitted TE polarized light of a specific wavelength is converted into TM polarized light again in the interaction region 7b. Unfiltered light (TE polarized light) is passed through the TM polarization analyzer 6 near the output end.
is emitted, the filtered light (TM polarized light) is transmitted, and a filtered light resulting from two-stage polarization conversion is output.
以上の説明は７Ｍ偏光入力の場合であるが、偏光分離素
子８におけるプロトン交換領域の形状を変化し、ＴＭ偏
光検光素子６をＴＥ偏光検光素子で置き換えることによ
り、ＴＥ４Ｍ光入力の光波長フィルタを構成することも
できる。The above explanation is for the case of 7M polarized light input, but by changing the shape of the proton exchange region in the polarization separation element 8 and replacing the TM polarization analysis element 6 with a TE polarization analysis element, the optical wavelength of the TE4M light input can be changed. Filters can also be configured.
さらに、゛これらＴＥ／ＴＭ両偏光入力の光波長フィル
タをパラレルに並べ、前段、後段にＴＥ／ＴＭ偏光分離
素子を設けることで偏光無依存型の光波長フィルタの構
成も可能である。Furthermore, by arranging these optical wavelength filters for both TE/TM polarization input in parallel and providing TE/TM polarization separation elements at the front and rear stages, it is possible to construct a polarization-independent optical wavelength filter.
以上説明したように本発明では一つの表面波励振用電極
の両側からの出力を用いることにより３ｄＢの挿入損失
が無くなり、一つのｔａで二段の偏光変換を行うことが
できることから従来の技術と同等のフィルタ透過特性の
改善を低印加電極で行うことができる。また、表面波励
振用電極自体でＴＭ偏光の減衰とＴＥ偏光の透過を行う
ことにより検光素子の作製工程の省略、光波長フィルタ
の構成の簡略化をも図ることができる。さらに、非フィ
ルタ光の取り出しを行うことが可能になり使用用途が拡
大する。このような光波長フィルタを供給できる効果は
極めて大きなものであるといえる。As explained above, in the present invention, the 3 dB insertion loss is eliminated by using the outputs from both sides of one surface wave excitation electrode, and two stages of polarization conversion can be performed with one ta, which is different from the conventional technology. Equivalent improvements in filter transmission properties can be achieved with lower applied electrodes. Furthermore, by attenuating TM polarized light and transmitting TE polarized light using the surface wave excitation electrode itself, it is possible to omit the manufacturing process of the analyzing element and to simplify the configuration of the optical wavelength filter. Furthermore, it becomes possible to extract unfiltered light, which expands the range of uses. It can be said that the effect of being able to supply such an optical wavelength filter is extremely large.
第１図、第２図、第３図は本発明の光波長フィルタの一
実施例を説明するための平面図である。
第４図は従来の技術を説明するための図である。
１・・・ニオブ酸リチウム基板、２・・・チタン拡散光
導波路、２３・・・Ｙ分岐型チタン拡散光導波路、２３
ａ・・・Ｙ分岐型チタン拡散光導波路の分岐枝、３・・
・バッファ層、４．４４ａ、４４ｂ・・・表面波励振用
電極、５，５４・・・ＴＥ偏光検光素子、６・・・ＴＭ
偏光検光素子、７ａ、７ｂ、７４ａ、７４ｂ・・・相互
作用領域。FIG. 1, FIG. 2, and FIG. 3 are plan views for explaining one embodiment of the optical wavelength filter of the present invention. FIG. 4 is a diagram for explaining the conventional technique. DESCRIPTION OF SYMBOLS 1... Lithium niobate substrate, 2... Titanium diffused optical waveguide, 23... Y-branch type titanium diffused optical waveguide, 23
a... Branch branch of Y-branch type titanium diffused optical waveguide, 3...
・Buffer layer, 4.44a, 44b... Electrode for surface wave excitation, 5, 54... TE polarization analysis element, 6... TM
Polarization analysis element, 7a, 7b, 74a, 74b... interaction region.
Claims (1)
光導波路の入力端と出力端の中央付近上にバッファ層を
介して表面波励振用電極を設け、中央付近と出力端付近
に、互いに直交する直線偏光を分離する素子を設けたこ
とを特徴とする光波長フィルタ。 ２、基板にチャネル型光導波路を備え、基板に対して垂
直な電界成分を有する直線偏光が充分に減衰するように
光導波路上に直接装荷した表面波励振用電極を前記チャ
ネル型光導波路の入力端と出力端の中央付近に設け、出
力端付近に互いに直交する直線偏光を分離する素子を設
けたことを特徴とする光波長フィルタ。[Claims] 1. A channel-type optical waveguide is provided on a substrate, and a surface wave excitation electrode is provided via a buffer layer near the center of the input end and output end of the channel-type optical waveguide, and An optical wavelength filter characterized in that an element for separating mutually orthogonal linearly polarized light is provided near an end. 2. A channel type optical waveguide is provided on the substrate, and a surface wave excitation electrode loaded directly on the optical waveguide is input to the channel type optical waveguide so that linearly polarized light having an electric field component perpendicular to the substrate is sufficiently attenuated. An optical wavelength filter characterized in that an element is provided near the center of an end and an output end and separates mutually orthogonal linearly polarized light near the output end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2160104A JP2880770B2 (en) | 1990-06-19 | 1990-06-19 | Optical wavelength filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2160104A JP2880770B2 (en) | 1990-06-19 | 1990-06-19 | Optical wavelength filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0451114A true JPH0451114A (en) | 1992-02-19 |
| JP2880770B2 JP2880770B2 (en) | 1999-04-12 |
Family
ID=15707939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2160104A Expired - Fee Related JP2880770B2 (en) | 1990-06-19 | 1990-06-19 | Optical wavelength filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2880770B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08234150A (en) * | 1995-02-28 | 1996-09-13 | Nec Corp | Acoustic optical filter |
| EP0889349A2 (en) * | 1997-07-02 | 1999-01-07 | Fujitsu Limited | Acousto-optical device |
| US6233372B1 (en) | 1998-03-03 | 2001-05-15 | Nec Corporation | Waveguide path type polarization independent optical wavelength tunable filter |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02153329A (en) * | 1988-12-06 | 1990-06-13 | Omron Tateisi Electron Co | Acoustooptic effect type waveguide type frequency shifter |
-
1990
- 1990-06-19 JP JP2160104A patent/JP2880770B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02153329A (en) * | 1988-12-06 | 1990-06-13 | Omron Tateisi Electron Co | Acoustooptic effect type waveguide type frequency shifter |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08234150A (en) * | 1995-02-28 | 1996-09-13 | Nec Corp | Acoustic optical filter |
| EP0889349A2 (en) * | 1997-07-02 | 1999-01-07 | Fujitsu Limited | Acousto-optical device |
| EP0889349A3 (en) * | 1997-07-02 | 1999-04-14 | Fujitsu Limited | Acousto-optical device |
| US6370308B1 (en) | 1997-07-02 | 2002-04-09 | Fujitsu Limited | Acousto-optical device |
| US6233372B1 (en) | 1998-03-03 | 2001-05-15 | Nec Corporation | Waveguide path type polarization independent optical wavelength tunable filter |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2880770B2 (en) | 1999-04-12 |
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