WO2023053406A1 - 光変調器 - Google Patents
光変調器 Download PDFInfo
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- WO2023053406A1 WO2023053406A1 PCT/JP2021/036281 JP2021036281W WO2023053406A1 WO 2023053406 A1 WO2023053406 A1 WO 2023053406A1 JP 2021036281 W JP2021036281 W JP 2021036281W WO 2023053406 A1 WO2023053406 A1 WO 2023053406A1
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- WIPO (PCT)
- Prior art keywords
- optical modulator
- housing
- optical
- multiplexer
- electro
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- 230000003287 optical effect Effects 0.000 title claims abstract description 104
- 238000006243 chemical reaction Methods 0.000 claims abstract description 38
- 239000000758 substrate Substances 0.000 claims description 20
- 230000005540 biological transmission Effects 0.000 abstract description 27
- 239000013256 coordination polymer Substances 0.000 description 5
- 239000011093 chipboard Substances 0.000 description 4
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 3
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 2
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 2
- GPXJNWSHGFTCBW-UHFFFAOYSA-N Indium phosphide Chemical class [In]#P GPXJNWSHGFTCBW-UHFFFAOYSA-N 0.000 description 2
- 230000001427 coherent effect Effects 0.000 description 2
- 235000019800 disodium phosphate Nutrition 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- WSMQKESQZFQMFW-UHFFFAOYSA-N 5-methyl-pyrazole-3-carboxylic acid Chemical compound CC1=CC(C(O)=O)=NN1 WSMQKESQZFQMFW-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
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Classifications
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- 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
- G02F1/0121—Operation of devices; Circuit arrangements, not otherwise provided for in this subclass
-
- 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
- G02F1/03—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 ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect
- G02F1/0305—Constructional arrangements
Definitions
- the present invention relates to an optical modulator, and more particularly to an optical modulator in which an electro-optic conversion element and a driver circuit for driving the electro-optic conversion element are housed in the same housing.
- optical modulators using materials with an electro-optical effect such as lithium niobate and semiconductors
- optical amplifiers are used to drive optical modulators, such as high-bandwidth coherent driver modulators (HB-CDM).
- HB-CDM high-bandwidth coherent driver modulators
- An optical modulator to be mounted inside the modulator has been proposed.
- DSP digital signal processor
- the length of the transmission line is long in the electrical signal connection with the outside, so low-speed signals are used, and the inside of the DSP installed in the equipment is It is common to have a parallel/serial conversion function, such as a multiplexer (MUX), that converts low-speed signals to high speed (see Patent Documents 1 and 2).
- MUX multiplexer
- the power consumption of DSPs will further increase, and since MUX accommodates multi-channel signals, it is considered unsuitable for reducing the power consumption and miniaturization of DSPs. It is also required to suppress signal deterioration (electrical reflection/transmission loss reduction) by reducing the number of parts such as connectors in the optical transmission device and shortening the length of the transmission line.
- FIG. 1 is a plan view showing an example of a conventional optical transmission device OT.
- the DSP generates modulation signals (XI, XQ, YI, YQ) based on the input electric signal ESin to drive the optical modulator OM.
- the signal processing unit SP of the DSP Based on the electrical signal ESin, the signal processing unit SP of the DSP generates a plurality of modulation signals, and the multiplexer MUX performs parallel/serial conversion to multiplex the signals.
- the modulated signal output from the DSP has a higher frequency, causing an increase in loss in the transmission line between the DSP and the optical modulator OM.
- the transmission line has a complicated structure, resulting in extremely large transmission loss.
- the modulated signal is transmitted to the driver circuit DRV via the relay board RB and amplified. Further, the output signal of the driver circuit DRV is input to an electro-optic conversion element such as an optical modulation element, modulates the light wave input from the light source LS, and is output from the optical transmission device OT as an optical signal LSout.
- an electro-optic conversion element such as an optical modulation element
- the optical modulator OM plays the role of an optical transmitter.
- the lower half of the optical transmission device in FIG. 1 is the optical transmitter side, and the upper half is the optical receiver side.
- the optical receiver OR receives an optical signal LSin from the outside of the optical transmission device OT, demodulates the optical signal using the light wave from the light source LS as reference light, and generates electrical signals (XI, XQ, YI, YQ). These electrical signals are processed by a DSP and converted into electrical signals for output. In the DSP, serial/parallel conversion processing is performed by a demultiplexer (DEMUX), and demultiplexing processing is also performed.
- DEMUX demultiplexer
- the problem to be solved by the present invention is to solve the problems described above and to provide an optical modulator that reduces the propagation loss associated with the transmission of high-frequency signals.
- the optical modulator of the present invention has the following technical features. (1) In an optical modulator housing an electro-optical conversion element and a driver circuit for driving the electro-optical conversion element in the same housing, an input modulation signal input from outside the housing is and a multiplexer for converting the modulation signal to an output modulation signal having a higher frequency than the modulation signal for output and supplying the modulation signal for output to the driver circuit, wherein the multiplexer is housed in the housing.
- the multiplexer is parallel/serial conversion means.
- the multiplexer and the driver circuit are arranged on a flip-chip substrate.
- An optical transmission device comprising the optical transmitter described in (7) above and an optical receiver.
- the present invention provides an optical modulator in which an electro-optic conversion element and a driver circuit for driving the electro-optic conversion element are housed in the same housing, wherein an input modulation signal input from outside the housing is A multiplexer that converts an input modulated signal into an output modulated signal having a higher frequency and supplies the output modulated signal to the driver circuit, and the multiplexer is accommodated in the housing.
- a low-frequency signal can be used as the input modulation signal to be input to, and propagation loss due to the signal transmission path can be reduced.
- the multiplexer, the driver circuit, and the electro-optical conversion element are housed in the same housing, it is possible to shorten the wiring of each member to the utmost limit, further suppressing the propagation loss of the modulated signal. becomes.
- FIG. 1 is a plan view showing an example of a conventional optical transmission device;
- FIG. 1 is a plan view showing an example of an optical transmission device according to the present invention;
- FIG. 1A and 1B are a plan view and a side view showing a first embodiment of an optical modulator according to the present invention;
- FIG. 4A is a plan view and a side view showing a second embodiment of the optical modulator according to the present invention;
- 3A and 3B are a plan view and a side view showing a third embodiment of an optical modulator according to the present invention;
- FIG. It is the top view, the side view, and the back view which show the 4th Example of the optical modulator which concerns on this invention.
- the optical modulator of the present invention is an optical modulator in which an electro-optic conversion element E/OC and a driver circuit DRV for driving the electro-optic conversion element are housed in the same housing CA.
- a multiplexer that converts an input modulated signal input from outside the housing into an output modulated signal having a higher frequency than the input modulated signal and supplies the output modulated signal to the driver circuit.
- a MUX is provided, and the multiplexer is housed in the housing CA.
- Substrates constituting electro-optic conversion elements particularly materials for forming optical waveguides include lithium niobate (LN), lithium tantalate (LiTaO 3 ), lanthanum zirconate titanate (PLZT), and indium phosphide compounds (InP).
- LN lithium niobate
- LiTaO 3 lithium tantalate
- PZT lanthanum zirconate titanate
- InP indium phosphide compounds
- Si silicon-based
- EO electro-optic
- a feature of the present invention is that, as shown in FIG. 2, a multiplexer MUX (parallel/serial conversion unit), which has conventionally been arranged in a DSP, is accommodated (incorporated) inside the casing CA of the optical modulator OM. be.
- the electrical signal to the external connection of the optical modulator operates with low-frequency (low-speed) signals and multiple channels, and the optical modulator internally operates with high-frequency (high-speed) signals and fewer channels (equal to the number of external channels). 1), and it is possible to realize a modulation operation exceeding 100 GHz per channel.
- the symbols used in FIG. 2 that are the same as those in FIG. 1 mean the same contents as in the configuration of FIG. 1 described above.
- This configuration replaces the electrical signal transmitted between the DSP and the optical modulator with a low speed signal.
- the channel ratio of the multiplexer MUX is 2:1
- the frequency of the external electrical signal is 1/2.
- the channel ratio is not limited to 2:1, but can be 4:1, 8:1, etc. In that case, the speed of electrical signals transmitted between the DSP and the optical modulator can be made slower.
- the multiplexer MUX when the multiplexer MUX is housed inside the housing of the optical modulator, the number of electrical signal transmission lines connecting the inside and outside of the housing doubles.
- the connector such as conventional connector pins
- FPC flexible printed circuit boards
- BGA ball grid array
- the interface of the optical modulator accommodates multi-channel signals compared to the conventional one, so the number of signal connection points increases. Therefore, as described above, it is possible to realize multi-channel signal connection in a limited space by using a plurality of flexible substrates and multi-point connection of BGA. Further, in FIG. 2 and each drawing described later, the width of the multiplexer MUX (the height in the vertical direction of the drawing) is wider than the width of the driver circuit DRV. For this reason, the size of the housing also becomes slightly larger due to the multiplexer MUX.
- the optical modulator of the present invention for example, it is important to reduce the transmission loss from the multiplexer MUX to the driver circuit and from the driver circuit to the electro-optic conversion element, which is a high-speed signal wiring of 128 Gbaud (signal band over 100 GHz). It is a feature. For this reason, as will be described later, a multiplexer MUX is mounted on a substrate, and electrical connection with a relay substrate and an electro-optic conversion element mounted inside the optical modulator is realized by flip-chip bonding. ing.
- 3A and 3B are a plan view and a side view showing the first embodiment of the optical modulator, and a multiplexer MUX is built in the housing CA.
- This multiplexer can reduce the frequency of the input modulation signal MSin by using parallel/serial conversion means.
- Input modulation signal MSin is introduced into the housing via connector CN.
- the lead-in line is a high frequency line (RFL) through which microwaves propagate.
- the relay board RB, the multiplexer MUX, the driver circuit DRV, and the electro-optic conversion element E/OC are linearly arranged. This is to cope with the speeding up of electric signals and to reduce propagation loss.
- Wire bonding connections WB are provided between the relay board RB and the multiplexer MUX, between the multiplexer MUX and the driver circuit DRV, and further between the driver circuit DRV and the electro-optic conversion element.
- the driver circuit used in HB-CDM consumes several watts of power, and the multiplexer MUX mounted on the DSP also consumes the same. Since these electric powers are converted into heat, a structure for heat dissipation is required. For example, it is possible to enhance the heat dissipation effect by using a metal with good thermal conductivity for the housing, the pedestal PD1 that supports the multiplexer, the pedestal PD2 that supports the driver circuit, and the pedestal PD3 that supports the electro-optic conversion element. .
- LE is a lens that collects light waves entering and exiting the electro-optic conversion element
- CO is a collimator lens barrel
- FB is an optical fiber. 4 and subsequent figures, the same reference numerals as those in FIG. 3 denote the same configurations, unless otherwise specified.
- FIG. 4 is a plan view and a side view showing a second embodiment of the optical modulator.
- the multiplexer MUX is arranged on the flip chip board FCB, and the connection between the flip chip board FCB and the relay board RB and the connection between the flip chip board FCB and the driver circuit DRV are electrically connected by flip chip bond connection. .
- Symbol PA means a pad portion used for flip-chip bond connection.
- FIG. 5 is a plan view and a side view showing a third embodiment of the optical modulator.
- the connector CN for receiving the input modulated signal from the outside is modified.
- the high-frequency interface wiring portion which is the transmission line of the modulated signal, is arranged on both the front side and the back side of the insulating substrate that constitutes the connector. With this configuration, it is possible to separate the adjacent transmission lines and suppress the crosstalk of the modulated signal.
- the third embodiment can increase the number of wires without increasing the size of the connector CN.
- FIG. 6 is a plan view, a side view and a bottom view showing a fourth embodiment of the optical modulator.
- the multiplexer MUX is fixed to the flip-chip substrate, and each member is flip-chip bonded.
- BGA ball grid array terminal
- FIG. 7 is a plan view and a side view showing a fifth embodiment of the optical modulator.
- a feature of the fifth embodiment is that the multiplexer MUX and the driver circuit DRV are incorporated into one chip circuit CP.
- this one-chip design realizes high-speed signal wiring with reduced electrical reflection and line loss. Due to the one-chip design, elements that consume a lot of power are concentrated in a small area. Therefore, the pedestal PD4 that supports the chip circuit CP must have a configuration that enhances conductivity.
- FIG. 8 is a plan view and a side view showing a sixth embodiment of the optical modulator.
- the chip circuit CP is arranged and fixed on the flip chip substrate FCB, and the electrical connection with the relay substrate RB and the electro-optic conversion element E/OC is made by flip chip bond connection. By doing so, high-speed signal wiring with reduced electrical reflection and line loss is realized.
- FIG. 9 is a plan view and a side view showing a seventh embodiment of the optical modulator
- FIG. 10 is a plan view and a side view showing the eighth embodiment of the optical modulator.
- a feature of these embodiments is that the input modulation signal MSin is transmitted using a flexible printed circuit board FPC (also referred to as a "flexible cable") provided outside the housing CA.
- FPC flexible printed circuit board
- the flexible substrate FPC is electrically connected to the bottom surface of the housing CA. properly connected.
- the flexible printed circuit board FPC is arranged using only one side surface of the housing CA. Not limited to this, it is also possible to arrange a plurality of flexible substrates FPC on a plurality of side surfaces of the housing to increase the number of wirings or increase the spacing between wirings.
- FIG. 11 is a plan view and a side view showing a ninth embodiment of the optical modulator.
- a feature of the ninth embodiment is that the relay board and the electro-optic conversion element are electrically connected using a flip-chip board FCB on which the one-chip chip circuit CP is mounted. This configuration enables simplification of manufacturing and assembly.
- a terminating resistor TR for terminating the modulated signal applied to the electro-optic conversion element is provided on the flip-chip substrate FCB to simplify the electro-optic conversion element E/OC. Since the heat generated by the terminating resistor cannot be ignored, it also contributes to separating the terminating resistor and the electro-optic conversion element.
- FIG. 12 is a plan view and a side view showing the tenth embodiment of the optical modulator.
- a feature of the tenth embodiment is that the contact area between the flip chip substrate FCB and the base PD is increased to efficiently dissipate the heat generated by the chip circuit CP. With this configuration, the electro-optic conversion element E/OC is arranged on the flip-chip substrate FCB.
- an optical modulator with reduced propagation loss associated with transmission of high frequency signals. It is also possible to provide an optical transmitter using the optical modulator, and an optical transmission apparatus using the optical transmitter.
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Abstract
Description
(1) 電気光学変換素子と、該電気光学変換素子を駆動するドライバ回路とを同一の筐体に収容する光変調器において、該筐体の外部から入力される入力用変調信号を、該入力用変調信号より高い周波数を有する出力用変調信号に変換すると共に、該出力用変調信号を該ドライバ回路に供給するマルチプレクサを備え、該マルチプレクサは該筐体内に収容されていることを特徴とする。
本発明の光変調器は、図2乃至12に示すように、電気光学変換素子E/OCと、該電気光学変換素子を駆動するドライバ回路DRVとを同一の筐体CAに収容する光変調器OMにおいて、該筐体の外部から入力される入力用変調信号を、該入力用変調信号より高い周波数を有する出力用変調信号に変換すると共に、該出力用変調信号を該ドライバ回路に供給するマルチプレクサMUXを備え、該マルチプレクサは該筐体CA内に収容されていることを特徴とする。
一方で光変調器内部は、内蔵したマルチプレクサMUX以降の信号配線部を短くすることで高周波(高速)信号の劣化を抑制する。また、光変調器の外部の電気信号を低速化することにより、光変調器とDSP線路間の線路設計自由度を確保できるなどの多くの利点もある。
また、図2や後述する各図面では、マルチプレクサMUXの幅(図面の上下方向の高さ)はドライバ回路DRVの幅より広い。このため、筐体のサイズもマルチプレクサMUXにより少し大きくなる。
図3は、光変調器の第1実施例を示す平面図と側面図であり、筐体CAの内部には、マルチプレクサMUXが内蔵されている。このマルチプレクサは、パラレル/シリアル変換手段を用いることで、入力用変調信号MSinの周波数を低下させることが可能となる。
入力用変調信号MSinはコネクタCNを介して筐体内に導入される。導入線路はマイクロ波が伝搬する高周波線路(RFL)となっている。筐体CA内では、中継基板RB、マルチプレクサMUX、ドライバ回路DRV、電気光学変換素子E/OCを直線状に配置している。これは、電気信号の高速化に対応し、伝搬損失を低減するためである。中継基板RBとマルチプレクサMUXとの間、マルチプレクサMUXとドライバ回路DRVとの間、さらには、ドライバ回路DRVと電気光学変換素子との間は、ワイヤボンディング接続WBで各々接続されている。
マルチプレクサMUXをフリップチップ基板FCB上に配置し、フリップチップ基板FCBと中継基板RBとの接続や、フリップチップ基板FCBとドライバ回路DRVとの接続は、フリップチップボンド接続で電気的に接続されている。これにより、電気反射と線路損失を低減させた高速信号配線を実現することが可能となる。符号PAはフリップチップボンド接続に使用されるパッド部を意味している。
これらの実施例の特徴は、筐体CAの外側に設けられたフレキシブル基板FPC(「フレキシブルケーブル」とも言う。)を用いて入力用変調信号MSinを伝送することである。フレキシブル基板FPCを用いることで、信号線路の短尺化の実現することが可能となる。
図9では、フレキシブル基板FPCは筐体CAの底面で電気的接続が行われ、図10では、筐体CAの側面壁を貫通するリードピンLPを介して、フレキシブル基板FPCと中継基板RBとを電気的に接続している。
また、図10では筐体CAの一側面のみを利用してフレキシブル基板FPCを配置している。これに限らず、筐体の複数の側面にフレキシブル基板FPCを複数配置し、配線数を増加、又は配線間の間隔の増加を行うことも可能である。
さらに、図11では、電気光学変換素子に印加された変調信号を終端する終端抵抗TRをフリップチップ基板FCB上に設け、電気光学変換素子E/OCの簡素化も図っている。終端抵抗の発熱も無視できないため、終端抵抗と電気光学変換素子とを離間させることにも寄与している。
CN コネクタ
DRV ドライバ回路
E/OC 電気光学変換素子
MUX マルチプレクサ(パラレル/シリアル変換)
Claims (6)
- 電気光学変換素子と、該電気光学変換素子を駆動するドライバ回路とを同一の筐体に収容する光変調器において、
該筐体の外部から入力される入力用変調信号を、該入力用変調信号より高い周波数を有する出力用変調信号に変換すると共に、該出力用変調信号を該ドライバ回路に供給するマルチプレクサを備え、
該マルチプレクサは該筐体内に収容されていることを特徴とする光変調器。 - 請求項1に記載の光変調器において、該マルチプレクサと該ドライバ回路とは一つのチップ回路に組み込まれていることを特徴とする光変調器。
- 請求項1又は2に記載の光変調器において、該マルチプレクサは、パラレル/シリアル変換手段であることを特徴とする光変調器。
- 請求項1乃至3のいずれかに記載の光変調器において、該マルチプレクサと該ドライバ回路は、フリップチップ基板上に配置されていることを特徴とする光変調器。
- 請求項4に記載の光変調器において、該電気光変換素子と該フリップチップ基板とはフリップチップ接続で電気的に接続されていることを特徴とする光変調器。
- 請求項1乃至5のいずれかに記載の光変調器において、該筐体の外側に設けられたフレキシブル基板を用いて該入力用変調信号を伝送することを特徴とする光変調器。
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JP2023550963A JPWO2023053406A1 (ja) | 2021-09-30 | 2021-09-30 | |
CN202180097324.XA CN117178224A (zh) | 2021-09-30 | 2021-09-30 | 光调制器 |
US18/280,906 US20240160051A1 (en) | 2021-09-30 | 2021-09-30 | Optical modulator |
EP21959441.3A EP4296764A1 (en) | 2021-09-30 | 2021-09-30 | Optical modulator |
PCT/JP2021/036281 WO2023053406A1 (ja) | 2021-09-30 | 2021-09-30 | 光変調器 |
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Citations (7)
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JP2018173595A (ja) * | 2017-03-31 | 2018-11-08 | 住友大阪セメント株式会社 | 光通信モジュール及びそれに用いる光変調器 |
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- 2021-09-30 EP EP21959441.3A patent/EP4296764A1/en active Pending
- 2021-09-30 JP JP2023550963A patent/JPWO2023053406A1/ja active Pending
- 2021-09-30 CN CN202180097324.XA patent/CN117178224A/zh active Pending
- 2021-09-30 WO PCT/JP2021/036281 patent/WO2023053406A1/ja active Application Filing
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JP2004264628A (ja) * | 2003-03-03 | 2004-09-24 | Nippon Telegr & Teleph Corp <Ntt> | 光送信モジュール |
US20060263095A1 (en) * | 2005-05-18 | 2006-11-23 | Futurewei Technologies, Inc. | Method and system for keeping timing alignment between driving signals in optical double modulation |
JP2013239830A (ja) | 2012-05-14 | 2013-11-28 | Mitsubishi Electric Corp | 光送信機 |
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JP2017085475A (ja) | 2015-10-30 | 2017-05-18 | 富士通株式会社 | 光伝送装置、光パワーモニタ、及び、光パワーモニタ方法 |
JP2018173595A (ja) * | 2017-03-31 | 2018-11-08 | 住友大阪セメント株式会社 | 光通信モジュール及びそれに用いる光変調器 |
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US20240160051A1 (en) | 2024-05-16 |
CN117178224A (zh) | 2023-12-05 |
JPWO2023053406A1 (ja) | 2023-04-06 |
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