WO2006077639A1 - 光モジュール - Google Patents
光モジュール Download PDFInfo
- Publication number
- WO2006077639A1 WO2006077639A1 PCT/JP2005/000677 JP2005000677W WO2006077639A1 WO 2006077639 A1 WO2006077639 A1 WO 2006077639A1 JP 2005000677 W JP2005000677 W JP 2005000677W WO 2006077639 A1 WO2006077639 A1 WO 2006077639A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- optical module
- light receiving
- optical
- receiving unit
- unit
- Prior art date
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 76
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 37
- 239000011324 bead Substances 0.000 claims abstract description 35
- 230000005540 biological transmission Effects 0.000 claims description 29
- 239000000463 material Substances 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 230000003321 amplification Effects 0.000 claims 1
- 238000009413 insulation Methods 0.000 claims 1
- 239000012212 insulator Substances 0.000 claims 1
- 238000003199 nucleic acid amplification method Methods 0.000 claims 1
- 230000010355 oscillation Effects 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 14
- 239000003990 capacitor Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 230000035945 sensitivity Effects 0.000 description 5
- 239000013307 optical fiber Substances 0.000 description 4
- 206010034972 Photosensitivity reaction Diseases 0.000 description 3
- 230000036211 photosensitivity Effects 0.000 description 3
- 239000006096 absorbing agent Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
- H01L27/144—Devices controlled by radiation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
- H01L31/02002—Arrangements for conducting electric current to or from the device in operations
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/40—Transceivers
Definitions
- the present invention relates to an optical module in which an optical signal transmission unit and a reception unit are integrated, and to an optical module that can reduce crosstalk between the transmission unit and the reception unit.
- IP Internet 'protocol
- optical transceivers for transmitting and receiving optical signals are becoming smaller and more densely mounted.
- a signal flowing through a transmitter in the optical transceiver leaks into an adjacent receiver, and crosstalk that generates noise or the like is a problem.
- a radio wave absorber is attached to the crosstalk radio wave generation part of the transmitter and the sensitive circuit part of the receiver (for example, refer to Patent Document 1 below), or the transmitter.
- a technique such as providing a low-pass filter is disclosed.
- ferrite is formed into a small cylindrical shape or the like as an element capable of suppressing crosstalk over a frequency band handled by an optical transceiver for optical communication, and is interposed in a signal path.
- ferrite beads There are ferrite beads. This ferrite bead absorbs high-frequency noise components among the components included in the signal that passes through, and converts them into heat for removal.
- a technology for providing ferrite beads in a cable for connection to a communication device see, for example, Patent Document 3
- a technology for providing ferrite beads in the ground line of each device for example, see Patent Document 4).
- FIG. 9 is a diagram showing a crosstalk countermeasure example of a conventional optical transceiver.
- the optical transceiver 10 emits light that drives an LD, which is a light emitting element, on a single printed circuit board 11.
- a transmitting unit 12 including an element driving circuit (LD driving circuit or the like) and a receiving unit 13 including a main amplifier circuit are provided.
- the transmitting unit 12 is connected to a light emitting unit 14 including an LD or the like, and the receiving unit 13 is connected to a light receiving unit 15 including a PD or the like.
- the distance between the light emitting unit 14 and the light receiving unit 15 is several mm.
- the receiving portion 13 of the printed board 11 is covered with the shield 16 to prevent crosstalk due to spatial propagation.
- the shield 16 a shield plate or a shield case is used.
- the transmitter 12 and the receiver 13 provided in one miniaturized optical transceiver 10 are supplied with the same power supply line power and are grounded to the same ground line. For this reason, a common impedance is generated, and the reception unit 13 is affected by the operation of the high-output transmission unit 12. The effect of this common impedance was also considered as one of the causes of crosstalk. Therefore, it was thought that the crosstalk caused by the common impedance could be reduced by providing the shield 16 as shown in FIG. 9 and separating the transmitter 12 and the receiver 13.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2002-185408
- Patent Document 2 Pamphlet of International Publication No. 00Z33490
- Patent Document 3 JP-A-10-208818
- Patent Document 4 Japanese Patent Laid-Open No. 10-209664
- optical transmitters and receivers in Internet 'traffic using optical fiber networks have been developed as standardized optical modules such as SFP (Small Form-Factor Pluggable, SFF (Small Form Factory, Common specifications such as XFP and ⁇ 0 Gigabit Small Form Factor Pluggable) have been established and functions and shapes have been unified!
- SFP Small Form-Factor Pluggable
- SFF Small Form Factory, Common specifications such as XFP and ⁇ 0 Gigabit Small Form Factor Pluggable
- the present invention has been made in view of the above, and is simple even if the size is limited.
- An object of the present invention is to provide an optical module that can reduce crosstalk at a low cost with a simple structure and can be miniaturized.
- the present invention provides an optical module in which a transmitter and a receiver that input and output an optical signal are stored in a housing, the transmitter and the transmitter
- the receiving unit is characterized in that a common power supply line and a ground line are connected, and ferrite beads are arranged on the dotted line of the receiving unit.
- the high frequency current component of the electrical signal flowing through the ground line is absorbed by the ferrite beads arranged on the ground line. That is, the oscillation of the series resonance circuit formed by the inductance component generated in the power supply line and the ground line of the light receiving element of the receiving unit and the capacitance component of the light receiving element is suppressed. This reduces cross talk.
- the optical module according to the present invention can be reduced in overall size and provided with a shield by disposing an element that blocks high-frequency components at a location suitable for crosstalk suppression on the circuit of the optical module. It is possible to reduce crosstalk with a simple configuration without any problems.
- FIG. 1 is a diagram showing a configuration of an optical module according to Example 1 of the present invention.
- FIG. 2 is a diagram showing a circuit configuration of a light emitting unit.
- FIG. 3 is a diagram showing a circuit configuration of a light receiving unit.
- FIG. 4 is a model diagram showing the circuit configuration of the optical module before taking measures against crosstalk.
- FIG. 5 is a diagram showing a circuit configuration of an optical module in which measures against crosstalk are taken.
- FIG. 6 is a chart showing the effect of improving crosstalk by attaching ferrite beads.
- FIG. 7 is a diagram showing a configuration of an optical module according to Example 2 of the present invention.
- FIG. 8 is a perspective view showing a configuration of a support portion in the optical module according to Embodiment 2 of the present invention.
- FIG. 9 is a diagram showing an example of crosstalk countermeasures in a conventional optical transceiver. Explanation of symbols
- FIG. 1 is a diagram illustrating a configuration of an optical module according to Embodiment 1 of the present invention.
- the optical module 100 is connected to the transmission unit 102 in the standardized casing 101, the printed circuit board 104 including the reception unit 103, and the transmission unit 102 of the printed circuit board 104, and outputs an optical signal to a transmission path (not shown).
- a light receiving unit 106 that is connected to the receiving unit 103 of the printed circuit board 104 and receives light from a transmission path (not shown).
- the transmitting unit 102 and the receiving unit 103 in the printed circuit board 104 are supplied with power by a common power (Vcc) force and are grounded to a common ground (GND).
- Vcc common power
- GND common ground
- FIG. 2 is a diagram showing a circuit configuration of the light emitting unit.
- the light emitting unit 105 is an LD (laser diode) 200 that is a light emitting element for outputting light (optical signal) to a transmission line that also has a connected optical fiber force, and a light receiving element for monitoring the output of the LD 200.
- PD photodiode
- LD laser diode
- the LD drive circuit in the transmitter 102 is repeatedly turned on and off to generate a binary electric signal and input it to the light emitter 105.
- the LD200 of the light emitting unit 105 The signal is converted into a synchronized optical signal and output to the transmission line.
- the PD 201 outputs an electrical signal corresponding to the light reception intensity of the light of the LD 200 and outputs it to the transmission unit 102.
- the output signal of the LD 200 can be monitored and stable light output can be performed.
- FIG. 3 is a diagram illustrating a circuit configuration of the light receiving unit.
- the light receiving unit 106 includes a light transmission element (PD) 300 for converting input light (optical signal) into an electric signal, a preamplifier 301 for amplifying the electric signal from the PD 300, and a transmission path force that is a connected optical fiber force. It is constituted by.
- a receiving unit 103 (see FIG. 1) connected to the light receiving unit 106 serves as a main amplifier circuit and receives electrical signals.
- the transmitter 102 and the receiver 103 are provided on the same printed circuit board 104 (see FIG. 1). As described above, the power is supplied by the same power (Vcc) and the same ground. Grounded to (GND).
- the installation interval between the light emitting unit 105 and the light receiving unit 106 is only a few millimeters.
- the current that drives the LD 200 of the light emitting unit 105 is a state in which an output current of several thousand times the current received by the PD 300 of the light receiving unit 106 is constantly flowing. For this reason, as mentioned above, there are concerns about the effects of spatial propagation, which was considered to be the largest cause of crosstalk.
- the largest cause of crosstalk is that the power source (Vcc) of the transmission unit 102 and the reception unit 103 and the ground (GND) The common impedance generated by making them the same.
- FIG. 4 is a diagram showing a circuit configuration of the optical module before taking measures against crosstalk. Using Fig. 4, we explain the principle by which common impedance causes crosstalk.
- FIG. 4 shows a circuit configuration mainly including the receiving unit 103 and the light receiving unit 106 of the optical module 100 (see FIG. 1).
- the preamplifier 301 in the figure is connected to a power supply (Vcc) line and a ground (GND) line.
- the output of the preamplifier 301 is connected to an amplifier 401 for further amplifying the output signal.
- a power line and a ground line connected to the amplifier 401 are omitted here.
- the capacitor 402 is a bypass capacitor, and lowers the impedance of the power supply (Vcc) line and has a role of preventing noise from being added to the electric signal transmitted through the circuit.
- the EO unit is the transmitting unit 102, and the power source (Vcc) and a plurality of grounds (GND) are connected to the receiving unit 103 and the transmitting unit (EO unit) 102. Vcc) and ground (GND).
- Vcc) and ground (GND ground
- an inductance component is generated on the power supply (Vcc) line that supplies power.
- a coil 403 in the figure represents an equivalent inductance rather than a circuit element such as a coil actually provided.
- the coil 404 represents the equivalent inductance generated in the ground (GND) line.
- the transmission unit 102 and the reception unit 103 have a difference in the output of the current to be handled, but in order to form a common impedance, the ground (under the influence of the high output current flowing through the transmission unit 102) GND) Generates a voltage that is the source of the component force of the inductance generated on the line.
- the ground under the influence of the high output current flowing through the transmission unit 102 GND
- GND GND
- the PD 300 is regarded as a capacitor (capacitance) when viewed as an AC circuit. Therefore, the series resonance circuit formed by the inductance component by the coils 403 and 404 and the capacitance component by the PD 300 resonates, and a high output through current flows in the circuit as crosstalk. Therefore, even if the capacitor 402 is used as the bypass capacitor described above, the effect of reducing the crosstalk cannot be expected. As a result of consideration, the most effective way to prevent crosstalk is to block the high-frequency component of the current caused by crosstalk flowing through the series resonant circuit and prevent oscillation.
- FIG. 5 is a diagram showing a circuit configuration of an optical module that has taken measures against crosstalk.
- an element that cuts off the high frequency on the arranged circuit is used.
- General-purpose ferrite beads can be used as an element for blocking high frequency. Specifically, as shown in the figure, the ferrite bead 500a attached to the power supply (Vcc) line of the PD300 and the power supply (Vcc) line of the preamplifier 301 are connected. Place ferrite beads in three locations: the ferrite bead 500b attached and the ferrite bead 500c attached to the ground (GND) line other than the line on which the signal received by the PD300 is transmitted.
- Vcc power supply
- Vcc power supply
- the ferrite beads 500 (500a-500c) attached to the optical module 100 according to the present invention has a structure in which an internal electrode for energization is embedded in the ferrite element. Acts as a magnetic substance, and has a function of absorbing high-frequency current components in electrical signals flowing through the wiring of the lines to which the ferrite beads 500 (500a-500c) are attached, and converting them into Joule heat. In other words, it is an element having a characteristic that it has a low resistance to a direct current flowing through an electric wire and a high resistance to an alternating current. Compared to other elements such as coils, which have similar functions, ferrite beads attenuate only high-frequency currents, so that high-frequency radiation to the surroundings can be greatly reduced. It has a feature that the influence of crosstalk due to propagation can be improved.
- ⁇ ⁇ is the bandwidth around the resonance frequency
- L is the coil inductance (Coinole 403, 404 equivalent inductance for the optical module 100)
- C is the capacitor capacity ( ⁇ D300 junction capacity)
- R represents the electrical resistance of the resonant circuit.
- the ferrite beads 500a to 500c have a maximum resistance component in the tens of MHz to 1GHz band, so the frequency band is less than lGHzbitZsec. It is extremely effective for crosstalk. For example, crosstalk can be reduced by using the 155MHz, 622MHz, and 1.25GHz bands.
- FIG. 6 is a chart showing the effect of improving crosstalk by attaching ferrite beads.
- FIG. 6 shows that when the transmitter 102 is not transmitting light (transmitter 102 is OFF) and when it is transmitting light (transmitter 102 is ON) This is a numerical value (dBm) of the receiving sensitivity in part 103.
- dBm the amount of improvement (dB) by crosstalk countermeasures is shown. The smaller the numerical value, the higher the sensitivity, and the smaller the improvement, the better the result.
- Fig. 6 shows the circuit configuration as follows: 1. When ferrite beads 500 (500a-500c) are attached to preamplifier 301, PD300 and GND (line). 2. Ferrite beads 500 (only to GND (line) When 500c) was installed, 3. Measurement was made for each case where no ferrite beads 500 were used and crosstalk was not taken.
- the transmission unit 102 If no optical transmission is performed in the transmission unit 102, crosstalk does not occur. Therefore, the transmission unit 102 is OFF and the crosstalk non-measurement state ( ⁇ 34.4 dBm) is used as a reference. Try to verify the amount of improvement. If the light receiving sensitivity is measured when transmitter 102 is turned on without taking any measures, it is 33. OdB, and the improvement is 1.4 dB. / It is expressed that! /
- the photosensitivity is -34.2 dBm, which indicates that the standard photosensitivity is higher than when no ferrite beads are used.
- the light receiving sensitivity is -33.4 dBm, and the improvement is 0.8 dB. Compared to the case, the deterioration was small.
- the photosensitivity is -34.OdBm, and the improvement is 0.2dB, which is not yet taken countermeasures. Compared to the case, it could be suppressed with slight deterioration.
- the ferrite beads are attached to the circuit constituting the receiving unit 103, thereby forming the common impedance and equivalent inductance of the transmitting unit 102 and the receiving unit 103. It is possible to prevent the occurrence of crosstalk between the transmission unit 102 and the reception unit 103 without causing an equivalent series oscillation circuit to oscillate.
- FIG. 7 is a diagram illustrating a configuration of an optical module according to the second embodiment of the present invention.
- FIG. 8 is a perspective view showing the configuration of the support portion in the optical module according to Embodiment 2 of the present invention.
- the optical module 700 includes a printed circuit board 104 including a transmitting unit 102 and a receiving unit 103 in a standardized casing 101 such as an SFP, and a printed circuit board.
- power is supplied from a common power source (Vcc) to the transmission unit 102 and the reception unit 103 of the printed circuit board 104, and a common ground (GND) is grounded.
- Vcc common power source
- GND common ground
- a support 701 for attaching the light emitting unit 105 and the light receiving unit 106 to the housing 101 is provided.
- the support 701 includes a light emitting portion 105 in the optical module 700 and a flange portion 800 protruding from the outer periphery of the light receiving portion 106 in a groove 701c formed in the upper support 701a and the lower support 701b. Fix to the housing 101.
- the support 701 is made of an insulating material, an insulated metal or a ferrite material, and serves as a radio wave absorber.
- the support 701 can absorb a voltage component that generates crosstalk, and can further reduce crosstalk. In particular, it is effective for small optical modules that perform optical transmission of wavelengths below lGHzbitZsec.
- the optical module according to the present invention is useful for reducing the crosstalk caused by the common impedance, and in particular, the small size specification such as SFP and SFF is standardized. Suitable for optical transmitter / receiver type.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Electromagnetism (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
- Optical Couplings Of Light Guides (AREA)
- Semiconductor Lasers (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006553797A JP4540680B2 (ja) | 2005-01-20 | 2005-01-20 | 光モジュール |
PCT/JP2005/000677 WO2006077639A1 (ja) | 2005-01-20 | 2005-01-20 | 光モジュール |
US11/826,975 US7720393B2 (en) | 2005-01-20 | 2007-07-19 | Optical module |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2005/000677 WO2006077639A1 (ja) | 2005-01-20 | 2005-01-20 | 光モジュール |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/826,975 Continuation US7720393B2 (en) | 2005-01-20 | 2007-07-19 | Optical module |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006077639A1 true WO2006077639A1 (ja) | 2006-07-27 |
Family
ID=36692037
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/000677 WO2006077639A1 (ja) | 2005-01-20 | 2005-01-20 | 光モジュール |
Country Status (3)
Country | Link |
---|---|
US (1) | US7720393B2 (ja) |
JP (1) | JP4540680B2 (ja) |
WO (1) | WO2006077639A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009027414A (ja) * | 2007-07-19 | 2009-02-05 | Oki Electric Ind Co Ltd | 光電波融合通信装置 |
JP2016119375A (ja) * | 2014-12-19 | 2016-06-30 | ホシデン株式会社 | 光電変換モジュール及びアクティブ光ケーブル |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2775806B1 (en) * | 2013-03-07 | 2015-03-04 | Tyco Electronics Svenska Holdings AB | Optical receiver and transceiver using the same |
JP6483634B2 (ja) * | 2016-03-09 | 2019-03-13 | シチズンファインデバイス株式会社 | 検出装置および検出システム |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2002365491A (ja) * | 2001-06-11 | 2002-12-18 | Sumitomo Electric Ind Ltd | 光モジュール及び光通信モジュール |
JP2003188458A (ja) * | 2001-12-19 | 2003-07-04 | Sumitomo Electric Ind Ltd | 光モジュール |
JP2004228552A (ja) * | 2002-06-03 | 2004-08-12 | Sumitomo Electric Ind Ltd | 光モジュール |
Family Cites Families (12)
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US4941201A (en) * | 1985-01-13 | 1990-07-10 | Abbott Laboratories | Electronic data storage and retrieval apparatus and method |
JPH04144109A (ja) | 1990-10-04 | 1992-05-18 | Toshiba Corp | 配線装置 |
JPH05134147A (ja) * | 1991-05-01 | 1993-05-28 | Sumitomo Electric Ind Ltd | 光モジユール |
JPH05284431A (ja) | 1992-03-31 | 1993-10-29 | Fujitsu General Ltd | テレビ受信機能を付加したパソコン |
JPH0745858A (ja) * | 1993-07-30 | 1995-02-14 | Matsushita Electric Works Ltd | 半導体リレー |
DE69737929T2 (de) * | 1996-11-22 | 2008-04-10 | Sony Corp. | Verbindungskabel, Kommunikationsvorrichtungen und Kommunikationsverfahren |
JPH10208818A (ja) | 1996-11-22 | 1998-08-07 | Sony Corp | 接続ケーブル、通信装置、および、通信方法 |
JPH10209664A (ja) | 1997-01-24 | 1998-08-07 | Oki Inf Syst | インタフェースノイズフィルタ |
WO2000033490A1 (en) | 1998-11-30 | 2000-06-08 | Fujitsu Limited | Optical transceiver module |
JP2002185408A (ja) | 2000-12-11 | 2002-06-28 | Mitsubishi Electric Corp | 光送受信器 |
JP2002288864A (ja) * | 2001-03-28 | 2002-10-04 | Sankyo Seiki Mfg Co Ltd | 光ヘッドの光源装置 |
US6791159B2 (en) * | 2002-06-03 | 2004-09-14 | Sumitomo Electric Industries, Ltd. | Optical module |
-
2005
- 2005-01-20 WO PCT/JP2005/000677 patent/WO2006077639A1/ja not_active Application Discontinuation
- 2005-01-20 JP JP2006553797A patent/JP4540680B2/ja not_active Expired - Fee Related
-
2007
- 2007-07-19 US US11/826,975 patent/US7720393B2/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002365491A (ja) * | 2001-06-11 | 2002-12-18 | Sumitomo Electric Ind Ltd | 光モジュール及び光通信モジュール |
JP2003188458A (ja) * | 2001-12-19 | 2003-07-04 | Sumitomo Electric Ind Ltd | 光モジュール |
JP2004228552A (ja) * | 2002-06-03 | 2004-08-12 | Sumitomo Electric Ind Ltd | 光モジュール |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009027414A (ja) * | 2007-07-19 | 2009-02-05 | Oki Electric Ind Co Ltd | 光電波融合通信装置 |
JP2016119375A (ja) * | 2014-12-19 | 2016-06-30 | ホシデン株式会社 | 光電変換モジュール及びアクティブ光ケーブル |
Also Published As
Publication number | Publication date |
---|---|
US7720393B2 (en) | 2010-05-18 |
US20070264022A1 (en) | 2007-11-15 |
JP4540680B2 (ja) | 2010-09-08 |
JPWO2006077639A1 (ja) | 2008-06-12 |
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