WO2005029165A1 - 光変調器 - Google Patents
光変調器 Download PDFInfo
- Publication number
- WO2005029165A1 WO2005029165A1 PCT/JP2004/012592 JP2004012592W WO2005029165A1 WO 2005029165 A1 WO2005029165 A1 WO 2005029165A1 JP 2004012592 W JP2004012592 W JP 2004012592W WO 2005029165 A1 WO2005029165 A1 WO 2005029165A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- electrode
- branch
- branch portion
- substrate
- optical modulator
- Prior art date
Links
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
- G02F1/21—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 by interference
- G02F1/225—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 by interference in an optical waveguide structure
- G02F1/2255—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 by interference in an optical waveguide structure controlled by a high-frequency electromagnetic component in an electric waveguide structure
-
- 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
- G02F2203/00—Function characteristic
- G02F2203/25—Frequency chirping of an optical modulator; Arrangements or methods for the pre-set or tuning thereof
Definitions
- the present invention relates to an optical modulator.
- the present applicant has disclosed in Japanese Patent Application Laid-Open Nos. H10-133,159 and H202-; L691333 that a substrate of a traveling waveform optical modulator is provided under an optical waveguide. It is disclosed that a thin portion is provided and the thickness of the thin portion is reduced to, for example, 10 in or less. As a result, high-speed light modulation is possible without forming a buffer layer made of silicon oxide, and the product (V TT -L) of the driving voltage V TT and the electrode length L can be reduced. , Is advantageous. Disclosure of the invention
- a traveling waveform optical modulator described in Japanese Patent Application Laid-Open Nos. 10-133159 and 2002-169133, for example, a single crystal of lithium niobate is used. (Coplanar type) electrode and mahatsuenda on X plate
- a -type optical waveguide is formed, a similar electric field is applied to each branch portion of the optical waveguide, and the electrode interaction length is made equal. As a result, an optical modulator having zero-chirp characteristics is obtained.
- an optical modulator using an X-plate or a Y-plate as a substrate may be advantageous for an optical modulator using an X-plate or a Y-plate as a substrate to have a predetermined chip amount.
- An object of the present invention is to provide a substrate made of an electro-optical material and having one main surface and the other main surface, an optical waveguide having one branch portion and the other branch portion, Another object of the present invention is to provide an optical modulator having a ground electrode and a signal electrode provided on one main surface side of a substrate, wherein the amount of chipping can be controlled to an appropriate value.
- the present invention relates to a substrate made of an electro-optical material and having one main surface and the other main surface, an optical waveguide formed on the substrate, having one branch portion and the other branch portion, and one of the substrates
- a ground electrode and a signal electrode are provided on the main surface side of the antenna, and one branch portion and the other branch portion are provided in an electrode gap between the ground electrode and the signal electrode, and a microwave electric field is formed.
- the present invention provides a substrate made of an electro-optical material and having one main surface and the other main surface, an optical waveguide formed on this substrate, having one branch portion and the other branch portion, and a substrate.
- the present invention relates to an optical modulator.
- the amount of the cap will be described.
- the amount of capping is also called “capping paralysis”.
- the electrode interaction length of the electric field strength at the branch is a value obtained by integrating the electric field strength E x (z) at each point z of the branch over the entire length L of the branch. This integral value is given as follows.
- the parameters representing the cap are as follows.
- ⁇ 2 represent the refractive index changes in waveguides a and b, respectively. This average change in refractive index is Is proportional to Therefore, the following equation holds.
- the conventional X-cut LN optical modulator generally has a symmetric structure at the center of the center electrode, and the interaction length of the optical waveguide is the same for both arms. For this reason, it was Ai-As. Therefore, m 2 1 was obtained, and the gap amount was 0. For this reason, various optical transmission systems cannot cope with the case where the optical modulator requires a predetermined amount of pickup.
- the integral values of the electric field intensity due to the electrode interaction length are made different in one branch portion and the other branch portion, whereby the optical modulator has a predetermined value. Is adjusted so that the amount of chars is obtained.
- FIG. 1 is a cross-sectional view schematically showing an optical modulator 1A according to an embodiment of the present invention, in which the width of the electrode gap 20A is smaller than the width of the electrode gap 20B.
- FIG. 2 is a cross-sectional view schematically showing an optical modulator 1B according to another embodiment of the present invention, in which the width of the electrode gap 20A is smaller than the width of the electrode gap 20B.
- FIG. 3 is a plan view schematically showing an optical modulator 1C according to still another embodiment of the present invention, in which a part 5c of the branch part 5 is provided below the ground electrode 4C.
- FIG. 4 is a cross-sectional view schematically showing an optical modulator 1D according to still another embodiment of the present invention, in which a branch portion 3 is provided on the thinner portion 12d side, and a branch portion 5 is provided. It is provided on the thick part 12c side.
- FIG. 5 is a cross-sectional view schematically showing an optical modulator 1E according to yet another embodiment of the present invention, in which low dielectric constant portions 10A and 10B are provided below a substrate 2.
- FIG. 6 is a cross-sectional view schematically showing an optical modulator 11 according to still another embodiment of the present invention, in which a branch part 14 is provided in an electrode gap 25 and a branch part 15 is provided. Is provided below the ground electrode 17B.
- FIG. 7 is a cross-sectional view schematically showing an optical modulator 1F according to still another embodiment of the present invention, in which a substrate 32 has a base 32 d, a thin portion 32 b having a different thickness, It has 3 2c.
- microwave electric fields having different intensities are applied to the one branch and the other branch, so that the respective integrals of the electric field strength due to the electrode interaction length are made different.
- the specific form is not limited, but preferably, a plurality of ground electrodes are provided, and the width of each electrode gap between the signal electrode and each ground electrode is made different. If the width of one electrode gap is made different from the width of the other electrode gap, the electric field strength at each branch located below each electrode gap also becomes different.
- FIG. 1 is a sectional view schematically showing an optical modulator 1A according to this embodiment.
- the optical modulator 1A includes, for example, a plate-shaped substrate 2. On one main surface 2 a side of the substrate 2, branch portions 3 and 5 of the optical waveguide are provided, and on the main surface 2 a, for example, a coplanar type signal electrode 4 B and ground electrodes 4 A and 4 C Is provided.
- the branch 3 is disposed in the electrode gap 2OA
- the branch 5 is disposed in the electrode gap 20B.
- a so-called coplanar type (Coplanar waveguide: CPW electrode) electrode arrangement is adopted, but the arrangement form of the electrodes is not particularly limited.
- the present invention can be applied to a so-called asymmetric coplanar strip line (A-CPS electrode) type electrode arrangement.
- A-CPS electrode asymmetric coplanar strip line
- the branch portions 3 and 5 of the optical waveguide are formed between the optical waveguide and the ground electrode 4C, and a signal voltage is applied to the branch portions 3 and 5 in a substantially horizontal direction.
- the optical waveguide constitutes a so-called Mahazenda type optical waveguide when viewed in a plan view.
- the difference between and G 2 is 3 microns or more. And more preferably at least 20 microns. In order to keep the overall VTTL small, it is preferably 100 ⁇ m or less, more preferably 40 ⁇ m or less.
- G or G 2 is preferably 1 ⁇ m or more, and more preferably 3 ⁇ m or more, in order to prevent conduction between the signal electrode and the ground electrode.
- one of the branch portions is arranged near the edge of the signal electrode or the ground electrode in the relatively narrow electrode gap.
- the branch portion 3 is arranged near the edge E of the signal electrode 4 B or the edge E of the ground electrode 4 A.
- a relatively large electric field is applied to the branch portion 3 on the side of the narrow electrode gap 20 A.
- the electric field intensity applied to the branch portion 3a can be further increased.
- the amount of the tip can be adjusted in a larger range, and the drive voltage-electrode length product V TTL can be reduced.
- the distance d1 between the center line S of the branch portion 3 and the signal electrode or the ground electrode is preferably 20 microns or less, and more preferably 10 microns or less.
- the distance between the branch portion 5, the ground electrode and the signal electrode is preferably 10 microns or more, and more preferably 20 microns or more.
- the electrode interaction lengths of the one branch and the other branch are different.
- each integral value of the electric field strength depending on the electrode interaction length can be made different. This is because, when the electric field strength is substantially the same, the longer the electrode interaction length L, the larger the integral value.
- FIG. 3 is a plan view schematically showing an optical modulator 1C according to this embodiment.
- Mach-Zehnder type optical waveguides 6, 7, 3 and 5 are provided on the substrate 2.
- Other branch unit 3 the signal electrodes 4 B and is formed on the electrode Giyappu 2 within 0 A of the ground electrode 4 A, its overall length L (approximately L 1 + L 2) Niwata connexion constant electric field E x Has been applied.
- an electric field of substantially constant intensity is applied to the portion 5a in the electrode gap 20B of the one branch portion 5 over its entire length.
- An electric field is also applied to the inclined portion 5b.
- no electric field is applied in the X-direction on the paper below the ground electrode 4C.
- a predetermined electric field is applied to the branch portion over the length L1, but almost no electric field is applied over the length L2, and the integral value decreases.
- the ratio of the integral values needs to be about 1: 4.
- the ratio of the electrode interaction length (L: L 1) between the branches 3 and 5 must be 1: 4.
- the size of the electrode gap is made different from each other, and the distance between the branch portion and the electrode edge is made different.
- the amount of chipping of the optical modulator can be controlled over a wider range.
- a plurality of ground electrodes are provided, the thickness of the substrate under an electrode gap between the signal electrode and one of the ground electrodes, and an electrode between the signal electrode and the other ground electrode.
- the thickness of the substrate at the gap differs from the thickness of the substrate.
- the electric field intensity applied to the branch portion at the electrode gap where the substrate is thicker is different from the electric field intensity applied to the branch portion at the electrode gap where the substrate is thinner. Therefore, the integral values at both branch portions can be made different.
- FIG. 4 is a sectional view schematically showing an optical modulator 1D according to this embodiment.
- the substrate 12 employs a relatively thick wall portion 12c and a relatively thin wall portion 12d.
- 1 2a and 1 2b are main surfaces.
- the electrode gap 20 A is provided on the thin portion 12 d side
- the electrode gap 20 B is provided on the thick portion 12 c side.
- T subl of the thin portion 12 d and the thickness T sub 2 of the thick portion 12 c are required.
- the difference is preferably at least 2 microns, more preferably at least 20 microns.
- T sub 1 is preferably 20 ⁇ m or less.
- a plurality of ground electrodes are provided, one low dielectric constant portion is provided below the substrate under an electrode gap between the signal electrode and one ground electrode, and the signal electrode and the other ground electrode are provided.
- the other low dielectric constant portion is provided under the substrate under the electrode gap between the electrodes. Then, the relative permittivity of one of the low permittivity portions is made different from the relative permittivity of the other low permittivity portion. If the relative permittivity of the low dielectric constant portion under the substrate is different from each other, the electric field strength applied to each branch portion also differs from each other. Therefore, the integral value can be made different between the two branch portions.
- FIG. 5 is a cross-sectional view schematically showing an optical modulator 1E according to this embodiment.
- the same reference numerals are given to the same structural parts and dimensions as those shown in FIG. 1, and the description will be used.
- one low dielectric constant portion 10A and the other low dielectric constant portion 10B are provided below the substrate 2.
- the electrode gap 20 A is provided on the low dielectric constant portion 10 A side
- the electrode gap 20 B is provided on the low dielectric constant portion 10 B side.
- the ratio of the relative permittivity between the low dielectric constant portion 10A and the low dielectric constant portion 10B is doubled. Above Preferably, it is more preferably 5 times or more.
- one branch is provided in the electrode gap between the ground electrode and the signal electrode, and the other branch is provided below the ground electrode. . Then, a microwave electric field is applied to each electrode interaction part of one branch part and the other branch part, and the light propagating through one branch part and the other branch part is modulated. At this time, by arranging one branch portion in the electrode gap, the amount of the tip can be appropriately adjusted. '
- FIG. 6 is a cross-sectional view schematically showing an optical modulator 11 according to this embodiment.
- the branch part 15 is provided below the signal electrode 1 ⁇ B via the buffer layer 16.
- An electrode gap 25 is provided between the signal electrode 17 A and the ground electrode 17 B.
- the branch portion 14 extends to the electrode gap 25, and the center line S of the branch portion 14 is provided outside the edge E of the signal electrode 17A by being separated by t.
- the branch section 14 and the signal electrode 17 A are separated by a buffer layer 16.
- t is preferably 20 ⁇ m or less, and more preferably 10 ⁇ m or less. Further, from the viewpoint of reducing the amount of chipping, t is preferably at least 0.5 ⁇ m, more preferably at least 1 ⁇ m.
- an electric field is applied to each branch in a direction substantially perpendicular to the main surface of the substrate.
- the thickness of the substrate is 30 ⁇ m or less at least in an electrode interaction length portion.
- the substrate has a base having a thickness of 30 m or more, preferably 200 m or more, and a concave portion is formed inside the base. According to such a substrate, high-speed light modulation can be realized while imparting mechanical strength suitable for handling to the substrate.
- the substrate includes a first thin portion having a relatively large thickness facing the concave portion and a second thin portion having a relatively small thickness facing the concave portion.
- An optical waveguide is provided in the first thin portion.
- the substrate main bodies described in JP-A-10-133159 and JP-A-2002-169913 can be used.
- the substrate 32 shown in FIG. 7 has a base portion 3 2 d, a first thin portion 3 2 b having a relatively large thickness facing the concave portion 33, and a relatively thick portion facing the concave portion 33. It has a second thinner section 32c of smaller thickness.
- An optical waveguide is provided in the first thinned portion 32b.
- 32 a is the main surface of the substrate.
- the bottom surfaces of the substrates 2, 12, and 13 can be bonded to a separate holding base via a bonding layer.
- the material forming the optical waveguide substrates 2, 12, and 13 is a ferroelectric electro-optic material, preferably a single crystal.
- a crystal is not particularly limited as long as it can modulate light, but lithium niobate, lithium tantalate, Examples thereof include lithium niobate monolithium tantalate solid solution, lithium niobate rhedium, KTP, GaAs, and quartz.
- the ground electrode and the signal electrode are not particularly limited as long as they are materials having low resistance and excellent impedance characteristics, and may be made of a material such as gold, silver, or copper.
- Known materials such as silicon oxide, magnesium fluoride, silicon nitride, and alumina can be used for the buffer layer.
- the optical waveguide is formed on the substrate main body, and is preferably formed on one main surface side of the substrate main body.
- the optical waveguide may be a ridge-type optical waveguide formed directly on one main surface of the substrate main body, and a ridge-type optical waveguide formed on one main surface of the substrate main body via another layer.
- the electrodes are provided on one main surface side of the substrate main body, but may be formed directly on one main surface of the substrate main body or may be formed on the buffer layer.
- the above-mentioned low dielectric constant portion means a portion having a relative dielectric constant lower than the relative dielectric constant of the electro-optical material forming the substrate main body.
- (Relative dielectric constant of low dielectric constant portion) / (Relative dielectric constant of electro-optical material constituting the substrate) is preferably 1/3 or less, more preferably 1/10 or less.
- the low dielectric portion may be a void.
- the low dielectric constant portion may be made of a solid material having a relative dielectric constant lower than that of the electro-optical material forming the substrate. Examples of such a material include alumina, aluminum nitride, lithium niobate, lithium tantalate, gallium arsenide, and silicon oxide.
- the low dielectric constant portion may be an adhesive.
- the type of the adhesive is not particularly limited, but a thickness of 300 m or less is appropriate.
- a low dielectric constant layer As a suitable low dielectric material to be used, it is desirable to use a material having a low dielectric loss (low tan d) from the viewpoint of reducing the propagation loss of a high frequency modulation signal. Examples of such a material having a low dielectric constant and a low dielectric loss include Teflon and an acrylic adhesive. Examples of other low dielectric constant materials include glass-based adhesives, epoxy-based adhesives, interlayer insulators for semiconductor manufacturing, and polyimide resins.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04772548A EP1666954A4 (en) | 2003-09-17 | 2004-08-25 | OPTICAL MODULATOR |
US11/344,297 US20060120654A1 (en) | 2003-09-17 | 2006-01-31 | Optical modulators |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-324373 | 2003-09-17 | ||
JP2003324373A JP2005091698A (ja) | 2003-09-17 | 2003-09-17 | 光変調器 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/344,297 Continuation US20060120654A1 (en) | 2003-09-17 | 2006-01-31 | Optical modulators |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005029165A1 true WO2005029165A1 (ja) | 2005-03-31 |
Family
ID=34372742
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/012592 WO2005029165A1 (ja) | 2003-09-17 | 2004-08-25 | 光変調器 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20060120654A1 (ja) |
EP (1) | EP1666954A4 (ja) |
JP (1) | JP2005091698A (ja) |
CN (1) | CN1853132A (ja) |
WO (1) | WO2005029165A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1840633A1 (en) * | 2006-03-30 | 2007-10-03 | Fujitsu Limited | Waveguide-type optical device |
US20100054654A1 (en) * | 2005-02-17 | 2010-03-04 | Anritsu Corporation | Optical Modulation Device |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4691428B2 (ja) * | 2005-03-31 | 2011-06-01 | 住友大阪セメント株式会社 | 光変調器 |
EP1916563A4 (en) | 2005-08-19 | 2008-08-27 | Anritsu Corp | OPTICAL MODULATOR |
US8644647B2 (en) * | 2006-03-31 | 2014-02-04 | Sumitomo Osaka Cement Co., Ltd. | Optical control device |
JP2008052103A (ja) * | 2006-08-25 | 2008-03-06 | Anritsu Corp | 光変調器 |
EP2116889B1 (en) | 2007-03-06 | 2014-08-06 | NGK Insulators, Ltd. | Optical phase modulator |
US8520984B2 (en) * | 2009-06-12 | 2013-08-27 | Cisco Technology, Inc. | Silicon-based optical modulator with improved efficiency and chirp control |
US10018888B2 (en) * | 2012-06-06 | 2018-07-10 | Eospace, Inc. | Advanced techniques for improving high-efficiency optical modulators |
JP5304938B2 (ja) * | 2012-10-01 | 2013-10-02 | 日本電気株式会社 | 光変調器および光変調方法 |
TWI572913B (zh) * | 2012-11-29 | 2017-03-01 | 鴻海精密工業股份有限公司 | 電光調製器 |
JP6575298B2 (ja) * | 2015-10-27 | 2019-09-18 | 住友大阪セメント株式会社 | 光変調器 |
US10591801B2 (en) * | 2016-04-21 | 2020-03-17 | Tdk Corporation | Optical modulator |
CN107957629A (zh) * | 2016-10-18 | 2018-04-24 | 天津领芯科技发展有限公司 | 基于特氟龙材料缓冲层的新型宽带铌酸锂电光调制器 |
US10295849B2 (en) * | 2016-12-16 | 2019-05-21 | Lumentum Operations Llc | Optical modulator |
JP6561383B2 (ja) * | 2017-03-31 | 2019-08-21 | 住友大阪セメント株式会社 | 光変調素子 |
JP7334616B2 (ja) * | 2019-12-26 | 2023-08-29 | 住友大阪セメント株式会社 | 光導波路素子、光変調器、光変調モジュール、及び光送信装置 |
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JPH04137322U (ja) * | 1991-06-13 | 1992-12-21 | 横河電機株式会社 | 導波路型光変調器 |
JPH0886991A (ja) * | 1995-10-09 | 1996-04-02 | Fujitsu Ltd | 光伝送方法、光伝送装置及び光伝送システム |
JPH11505337A (ja) * | 1995-05-18 | 1999-05-18 | インテグレイテッド オプティカル コンポーネンツ リミテッド | 集積光変調器 |
JP2002357797A (ja) * | 2001-03-30 | 2002-12-13 | Ngk Insulators Ltd | 光導波路デバイス、その製造方法および進行波形光変調器 |
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US5402154A (en) * | 1991-01-29 | 1995-03-28 | Ricoh Company, Ltd. | Optical recording system capable of changing the beam size |
JP3603977B2 (ja) * | 1996-09-06 | 2004-12-22 | 日本碍子株式会社 | 進行波形光変調器およびその製造方法 |
US6069729A (en) * | 1999-01-20 | 2000-05-30 | Northwestern University | High speed electro-optic modulator |
JP4471520B2 (ja) * | 2000-09-22 | 2010-06-02 | 日本碍子株式会社 | 進行波形光変調器 |
WO2005086447A1 (en) * | 2004-03-05 | 2005-09-15 | Samsung Electronics Co., Ltd. | Method and apparatus for allocating subcarriers in a broadband wireless communication system using multiple carriers |
KR100742127B1 (ko) * | 2004-06-25 | 2007-07-24 | 삼성전자주식회사 | 직교 주파수 분할 다중 접속 이동통신시스템에서 상향링크 랜덤 접속 채널을 송수신하기 위한 장치 및 방법 |
-
2003
- 2003-09-17 JP JP2003324373A patent/JP2005091698A/ja not_active Withdrawn
-
2004
- 2004-08-25 WO PCT/JP2004/012592 patent/WO2005029165A1/ja not_active Application Discontinuation
- 2004-08-25 EP EP04772548A patent/EP1666954A4/en not_active Withdrawn
- 2004-08-25 CN CNA200480026671XA patent/CN1853132A/zh active Pending
-
2006
- 2006-01-31 US US11/344,297 patent/US20060120654A1/en not_active Abandoned
Patent Citations (4)
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JPH04137322U (ja) * | 1991-06-13 | 1992-12-21 | 横河電機株式会社 | 導波路型光変調器 |
JPH11505337A (ja) * | 1995-05-18 | 1999-05-18 | インテグレイテッド オプティカル コンポーネンツ リミテッド | 集積光変調器 |
JPH0886991A (ja) * | 1995-10-09 | 1996-04-02 | Fujitsu Ltd | 光伝送方法、光伝送装置及び光伝送システム |
JP2002357797A (ja) * | 2001-03-30 | 2002-12-13 | Ngk Insulators Ltd | 光導波路デバイス、その製造方法および進行波形光変調器 |
Non-Patent Citations (1)
Title |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100054654A1 (en) * | 2005-02-17 | 2010-03-04 | Anritsu Corporation | Optical Modulation Device |
US8311371B2 (en) * | 2005-02-17 | 2012-11-13 | Anritsu Corporation | Optical modulation device |
EP1840633A1 (en) * | 2006-03-30 | 2007-10-03 | Fujitsu Limited | Waveguide-type optical device |
US7373025B2 (en) | 2006-03-30 | 2008-05-13 | Fujitsu Limited | Waveguide-type optical device |
Also Published As
Publication number | Publication date |
---|---|
EP1666954A4 (en) | 2007-03-07 |
JP2005091698A (ja) | 2005-04-07 |
US20060120654A1 (en) | 2006-06-08 |
EP1666954A1 (en) | 2006-06-07 |
CN1853132A (zh) | 2006-10-25 |
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