WO2005083915A1 - 無線光融合通信システムにおける周波数変換方法及び基地局 - Google Patents
無線光融合通信システムにおける周波数変換方法及び基地局 Download PDFInfo
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- WO2005083915A1 WO2005083915A1 PCT/JP2005/003238 JP2005003238W WO2005083915A1 WO 2005083915 A1 WO2005083915 A1 WO 2005083915A1 JP 2005003238 W JP2005003238 W JP 2005003238W WO 2005083915 A1 WO2005083915 A1 WO 2005083915A1
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- frequency
- optical
- signal
- light source
- wireless
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- 230000003287 optical effect Effects 0.000 title claims abstract description 183
- 238000004891 communication Methods 0.000 title claims abstract description 35
- 230000004927 fusion Effects 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims description 25
- 238000006243 chemical reaction Methods 0.000 title claims description 18
- 239000013307 optical fiber Substances 0.000 claims abstract description 9
- 230000010355 oscillation Effects 0.000 claims description 25
- 235000008331 Pinus X rigitaeda Nutrition 0.000 claims 1
- 235000011613 Pinus brutia Nutrition 0.000 claims 1
- 241000018646 Pinus brutia Species 0.000 claims 1
- 239000000284 extract Substances 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 abstract description 19
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 9
- 238000001228 spectrum Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 239000000758 substrate Substances 0.000 description 3
- 230000001629 suppression Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Classifications
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- 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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
-
- 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
- G02F2/00—Demodulating light; Transferring the modulation of modulated light; Frequency-changing of light
-
- 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
- H04B10/25—Arrangements specific to fibre transmission
-
- 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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
- H04B10/25752—Optical arrangements for wireless networks
- H04B10/25758—Optical arrangements for wireless networks between a central unit and a single remote unit by means of an optical fibre
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
-
- 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
- G02F2/00—Demodulating light; Transferring the modulation of modulated light; Frequency-changing of light
- G02F2/002—Demodulating light; Transferring the modulation of modulated light; Frequency-changing of light using optical mixing
Definitions
- the present invention relates to a wireless optical fusion communication system that combines optical fiber transmission and wireless communication, and more particularly, to a technique for switching a radio frequency in the wireless communication system.
- an optical signal is generated using first and second laser light sources having different wavelengths, and the first optical signal is non-carrier-suppressed single sideband by an intermediate frequency band signal.
- SSB Modulates to an optical modulation signal or a double sideband (DSB) optical modulation signal, and mixes it with the second optical signal for transmission.
- the optical signal is photoelectrically converted to generate an unmodulated carrier and a wireless modulated signal, and a product component of both is generated at the time of reception, thereby extracting the intermediate frequency band converted signal and extracting the signal. It is to demodulate.
- FIG. 10 is a configuration diagram of a wireless optical fusion communication system according to the present method. As shown in the figure, it consists of a base station (100), a remote antenna station (110), and a receiving terminal (120). An optical fiber transmission line (130) and a remote station exist between the base station (100) and the remote antenna station (110). The antenna station (110) and the receiving terminal (120) are connected by a radio channel (131).
- the base station (100) has the first laser that oscillates in single mode at the oscillation frequency ⁇ (Hz).
- a generator (103) is provided.
- the intermediate frequency band signal of the intermediate frequency fm (Hz) generated by the intermediate frequency band signal generator (103) is input as a modulation signal to the optical modulator (104) in the base station (100),
- the first optical signal from the first laser light source (101) becomes a signal light modulated by the optical modulator (104).
- optical modulator (104) since a carrier suppression type optical single sideband (optical SSB) modulator is used as the optical modulator (104), a carrier residual type image suppression signal is obtained.
- the second optical signal from the second laser light source (102) is input to the optical mixer (105) without any modulation, and is mixed with the optical signal from the optical modulator (104).
- the optical spectrum (140) in the transmission path (130) is as shown in the figure.
- the received optical signal is square-detected by the photoelectric converter (111), amplified by the amplifier (112), and then amplified by the antenna (113). ) Is emitted into the air.
- the spectrum (144) of the radio signal at this time is as shown in the figure, and is an image-suppressed signal with a carrier frequency of ⁇ -f 2 (Hz) (for example, a millimeter wave frequency).
- the remote antenna station (110) does not require a radio frequency band filter that removes only the lower sideband, and the receiving terminal (120) does not require an oscillator, which reduces costs.
- the signal is received by an antenna (121), square-detected by a detector (122) via an amplifier or a band-pass filter (not shown), and sent to a signal demodulator (123).
- the product product of the unmodulated carrier (145) of the wireless signal (144) and the two components of the wireless modulated signal component (146) is By being generated, the intermediate frequency band signal is reproduced.
- the signal demodulator (123) By inputting the intermediate frequency band signal to the signal demodulator (123), it is demodulated and an information signal can be extracted.
- the present invention has been made in view of the above-mentioned problems of the related art, and has as its object to provide a technique for easily and quickly switching a radio frequency channel. Disclosure of the invention
- the invention according to claim 1 generates a radio modulation signal in a base station, converts the radio modulation signal into an optical signal while maintaining the modulation form by performing electro-optical conversion, and converts the radio modulation signal into an optical signal to a remote antenna station.
- the present invention relates to a wireless optical fusion communication system in which fiber transmission is performed, and the remote antenna station performs a photoelectric conversion on the transmitted optical signal to extract a wireless modulation signal and wirelessly transmit the signal from an antenna.
- a first light source and a second light source for generating optical signals of different frequencies, an intermediate frequency band signal generating means for generating a modulation signal in an intermediate frequency band, and the intermediate frequency band signal.
- a modulator for modulating an optical signal from the first light source into a carrier non-suppressed single sideband (SSB) optical modulation signal or a double sideband (DSB) optical modulation signal; and the modulated optical signal.
- SSB carrier non-suppressed single sideband
- DSB double sideband
- an optical mixer that mixes an optical signal from the second light source and transmits the mixed light.
- the difference between the frequencies of the two optical signals is adjusted to be a desired wireless modulation signal frequency.
- the remote antenna station It is characterized by switching the frequency channel of the radio modulation signal to be performed.
- the frequency conversion method according to claim 2 is a method in which an optical frequency shifter is inserted at least after any one of the first light source and the second light source to shift the frequency of the optical signal from the light source. It is.
- the optical frequency shifter includes an optical waveguide including two sub-Mach-Zehnders in the main Mach-Zeng, and determines a frequency shift amount.
- a frequency shift according to the oscillation signal frequency is performed by changing a voltage to be applied to generate a predetermined phase difference between the waveguides.
- the phase difference between the waveguides of the sub-Mach-Zehng is set to + peak or ⁇ 7 °, while the phase difference between the waveguides of the main Mach-Zehng is + 7TZ.
- the frequency of the optical signal from the light source is shifted to the upper sideband component and the lower sideband component by the above-mentioned predetermined frequency, respectively.
- a frequency shift amount corresponding to twice the predetermined frequency can be obtained.
- the phase difference between the waveguides of the main Mach-Zehnder is set to + 7tZ2 or 17 ⁇ 2, while the phase difference between the waveguides of the sub-Mach-Zehng is set.
- the frequency of the optical signal from the light source is shifted to the upper sideband component and the lower sideband component by the predetermined frequencies, respectively. It is also possible to obtain a frequency shift equivalent to twice the specified frequency.
- the invention according to claim 6 is characterized in that the applied voltage is constituted by a pulse train having a predetermined pulse frequency, a pulse pattern, and a pulse voltage, and the wireless modulation frequency is hobbed.
- the frequency can be hopped to hop the radio modulation frequency.
- a base station including the above-described frequency conversion method in the wireless optical fusion communication system.
- FIG. 1 is a configuration diagram of a wireless optical fusion communication system according to the present invention.
- Fig. 2 shows the optical spectrum in the optical fiber transmission line.
- FIG. 3 is a spectrum of a radio modulation signal.
- FIG. 4 is a characteristic diagram of the reception power in the receiver.
- FIG. 5 is a plan view of the optical frequency shifter according to the present invention.
- FIG. 6 is an aa ′ sectional view of the optical frequency shifter according to the present invention.
- FIG. 7 is a bb ′ sectional view of the optical frequency shifter according to the present invention.
- FIG. 8 is a diagram showing a state of a light component in each optical waveguide.
- FIG. 9 is a diagram showing a state of a light component in each optical waveguide.
- FIG. 10 is a configuration diagram of a wireless optical fusion communication system in a conventional configuration.
- FIG. 1 shows the overall configuration of a wireless optical fusion communication system according to the present invention.
- the basic elements are the same as the configuration shown in Fig. 10, that is, the base station (10), the remote antenna station (20), and the receiving terminal (30) are respectively connected to the optical fiber transmission line (40), They are connected by road (41).
- the base station (10) has the first laser light source (11) that oscillates in single mode at the oscillation frequency ⁇ (Hz) and the second laser light source (12) that oscillates at the oscillation frequency f 2 (Hz). ), An intermediate frequency band signal generator (13), and a carrier suppression type optical single sideband (optical SSB) modulator (14).
- a second laser light source (12) is newly added.
- An optical frequency shifter (15) is provided immediately after.
- the configurations of the remote antenna station (20) and the receiving terminal (30) are the same as the configuration in FIG.
- the remote antenna station (20) squares the received optical signal
- the opto-electric converter (1), amplifier (22), and antenna (23) to be detected are connected to the receiving terminal (30), and the antenna (31), an amplifier and bandpass filter (not shown), the detector (32), A signal demodulator (33) is provided.
- the present invention has created a technique for switching a radio frequency in a radio propagation path, and utilizes the advantages of the self-heterodyne transmission system according to the present invention to change the optical frequency of a laser light source (11) (12). We propose to switch the radio frequency only.
- the present invention mainly assumes the millimeter wave band as the radio frequency.
- the equipment in the millimeter wave band is expensive, and particularly high-stable equipment has a problem that it is difficult to develop it.
- Technology for switching radio frequency channels was needed.
- the difference between the optical frequencies of the two laser light sources becomes the radio frequency in the radio channel, so that the radio frequency channel can be switched without using a millimeter-wave band device.
- the present invention has been made by paying attention to this feature, and proposes to change the optical frequency, which has not been proposed in the self-heterodyne transmission system.
- Oscillation frequency ⁇ (Hz)
- One oscillation frequency f 2 (Hz) is a radio frequency channel. For example, if the oscillation frequency of the first laser light source (11) is increased, the radio frequency also increases, and the channel can be switched. is there.
- Fig. 2 shows the optical spectrum in the optical fino transmission line (40).
- the frequency is n + f_m (Hz).
- the frequency distribution of the modulated signal (42), the frequency ⁇ ( ⁇ ), and the oscillation signal (43) (44) of the frequency f2 (Hz) is obtained. Since the modulating signal (42) and the oscillating signal (43) are separated by the millimeter wave frequency and the intermediate frequency in the radio channel, respectively, if the oscillating signal (44) shifts by, for example, s (Hz), the same amount Shift only.
- the carrier component (45) and the modulated signal component (46) propagate in the millimeter wave band as shown in FIG. 3, and the frequency in the millimeter wave band at this time also becomes f ⁇ s (Hz). That is, the carrier component + the signal component are arbitrarily shifted according to the shift amount given by the optical frequency shifter.
- the received power characteristics indicate that in a multipath environment, multiple radio waves containing the same information arrive at the receiving terminal at the same time, so depending on the phase relationship of the received signal, the received power (PW)
- PW received power
- high-frequency radio signals such as millimeter waves can easily change the phase relationship of the received signal and deteriorate the received power, even if the distance (D) between the transmitting antenna and the receiving terminal is slightly changed. Seamless communication becomes difficult.
- high-speed hopping of the wireless carrier frequency and synthesis of received signals that contain the same information and differ in distance characteristics make it possible to suppress poor reception power regardless of the distance at which the signal is received equivalently. It becomes possible.
- FIG. 5 shows a plan view
- FIG. 6 shows a cross-sectional view taken along section aa ′
- FIG. 7 shows a cross-sectional view taken along section bb ′.
- This optical frequency shifter (15) is called an X-cut LN modulator fabricated using lithium niobate.
- the main Mach-Zender (MMZ) (50) contains two sub-Mach-Zenders ( SMZ)
- the optical waveguide containing (60) and (70), the RF + DC electrode (Ho t) consists of two ports (61) and (71), and the DC electrode (Ho t) consists of one port (51). I have.
- the RF + DC electrode may not be one port, but may be arranged in series with the two ports of the RF electrode and the DC electrode in the sub-Mach-Zehnder.
- the sub-Mach-Zenda (60) (70) Since the GND electrodes (62) formed on the entire surface of the substrate are located on both sides of the RF + DC electrodes (61) and (71), the RF + DC electrodes (61) and GND electrodes (62a), Similarly, RF + DC electrode (61) and GND electrode (62b), RF + DC electrode (71) and GND electrode (62b), RF + DC electrode (71) and GND electrode (62c) + An electric field is generated from the DC electrode to the GND electrode. At this time, an optical phase difference 7T is generated between the optical waveguides (63) and (64) provided in the substrate between the electrodes, and an optical phase difference 7C is similarly generated between the optical waveguides (72) and (73). Apply DC voltage to
- the DC voltage is generated by a DC power supply (16) connected to the optical frequency shifter (15).
- the DC voltage is independent of the RF + DC electrodes (61) (71) and the DC electrode (51) described later. A voltage can be applied.
- an RF oscillation signal of s (Hz) corresponding to the frequency to be shifted is input from the RF + DC electrodes (61) and (71), and the oscillation frequency f 2 ( Hz) to generate a light component shifted by s (Hz).
- the RF oscillation signal is generated by a microwave oscillator (17) connected to an optical frequency shifter (15).
- the main Mach-Zenda (50) has a DC electrode (51) in the center, and GND electrodes (62d) and (62e) on both sides of the DC electrode.
- the optical waveguide (52) obtained by combining (63) and (64) and the optical waveguide (53) obtained by combining the optical waveguides (72) and (73) are provided in the substrate.
- a voltage is applied from the DC electrode (51), and the above oscillation frequency shifted by f ⁇ s (Hz) is shifted to the upper sideband (ie, frequency shift by + fs) or shifted to the lower sideband ( ⁇ Frequency shift by s). That is, when the upper sideband is shifted and the lower sideband is shifted, a voltage that induces the induced phase amount in the optical waveguide W1 (52) and the optical waveguide W2 (53) as shown in the following table is applied to the DC electrode (51). Apply from The details are described below.
- FIG. 7 is a diagram showing light components in an optical waveguide (54) obtained by combining optical waveguides (52) and (53).
- Fig. 8 shows the results when the upper sideband is shifted.
- (A) is the optical waveguide (63)
- (b) is the optical waveguide (64)
- (c) is the optical waveguide (72)
- (d) is the optical waveguide.
- (73.) and (e) show optical components in the optical waveguide (52)
- (f) shows optical components in the optical waveguide (53)
- (g) shows optical components in the optical waveguide (54).
- FIG. 9 shows the results when the lower sideband is shifted.
- A is the optical waveguide (63)
- (b) is the optical waveguide (64)
- (c) is the optical waveguide (72)
- (d) Is a diagram showing optical components in the optical waveguide (73)
- (e) is an optical waveguide (52)
- (f) is an optical waveguide (53)
- (g) is a diagram showing optical components in the optical waveguide (54).
- the RF transmission signal input to the RF + DC electrodes (61) and (71) by adjusting the RF transmission signal input to the RF + DC electrodes (61) and (71), the light components (a) and (b), (c) and (d) in FIG.
- the phase difference of ⁇ 2 in the optical components (e) and (f) in FIG. 8, and the optical components (e) and (f) in FIG. In) set so that there is a phase difference of 12.
- the frequency shifter (15) can be provided immediately after the first laser light source (11) and between the optical modulator (14). By providing the light source immediately after the light source as described above, the light amount of the light source is large and there is no modulation spectrum, so there is an advantage in that the shift can be easily adjusted. However, it may be provided immediately after the optical modulator (14).
- the phase difference given to the optical waveguides (52) and (53) by adjusting the applied voltage in the main Mach-Zehnder (50) is fixed to I ⁇ 2I.
- the sub-Mach-Zehnder (60), (70) the same effect can be obtained even if the polarity is reversed.
- both sub-Mach-Zehnder (60), (70) the same effect can be obtained even if the polarity is reversed.
- the main Mach-Zehnder may set the phase difference to I ⁇ / 2I.
- a pulse generator can be used instead of the DC power supply (16).
- the optical frequency shifter by driving the optical frequency shifter with a high-speed pulse train, high-speed frequency hopping according to the pulse frequency, pulse pattern, and pulse voltage can be generated in the radio signal.
- frequency hopping is performed in this manner, a frequency diversity effect can be obtained as in the reception power characteristic of the receiving terminal (30) shown in FIG. Has strong resistance to multipath environment.
- a configuration using a known hopping synthesizer may be used instead of the microwave oscillator (17) for oscillating the RF signal.
- hopping the shift amount can also be configured so that both the carrier component and the modulation signal component in the radio frequency band hop.
- the frequency can be arbitrarily converted and the radio frequency channel can be switched.
- an optical frequency shifter it is not necessary to install a complicated optical frequency control function in the light source, which contributes to high-speed and highly stable switching of radio frequency channels.
- the circuit for driving the optical frequency shifter does not use components in the millimeter-wave band specification, so that the cost of the circuit can be reduced.
- a larger frequency channel can be changed even with a low-frequency input signal as an oscillation signal input to the optical frequency shifter.
- It can be used for wireless optical fusion communication systems that switch wireless frequency channels.
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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Abstract
Description
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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CN200580009041.6A CN1934806B (zh) | 2004-02-26 | 2005-02-21 | 在无线电光学融合通信系统中用于改变频率的方法及基站 |
US10/590,518 US7697846B2 (en) | 2004-02-26 | 2005-02-21 | Method for changing frequency and base station in radio optical fusion communication system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2004-052303 | 2004-02-26 | ||
JP2004052303A JP3841793B2 (ja) | 2004-02-26 | 2004-02-26 | 無線光融合通信システムにおける周波数変換方法及び基地局 |
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WO2005083915A1 true WO2005083915A1 (ja) | 2005-09-09 |
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PCT/JP2005/003238 WO2005083915A1 (ja) | 2004-02-26 | 2005-02-21 | 無線光融合通信システムにおける周波数変換方法及び基地局 |
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US (1) | US7697846B2 (ja) |
JP (1) | JP3841793B2 (ja) |
KR (1) | KR101035741B1 (ja) |
CN (1) | CN1934806B (ja) |
WO (1) | WO2005083915A1 (ja) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
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EP1361683A1 (en) * | 2002-02-08 | 2003-11-12 | Motorola, Inc. | Optical to radio frequency detector |
JP4665134B2 (ja) | 2005-08-08 | 2011-04-06 | 独立行政法人情報通信研究機構 | 光搬送波抑圧両側波帯変調器を用いた4倍波発生システム |
KR100737855B1 (ko) * | 2005-11-29 | 2007-07-12 | 삼성전자주식회사 | 무선 식별 태그의 단측파 대역 응답 방법 |
WO2007148413A1 (ja) * | 2006-06-23 | 2007-12-27 | National Institute Of Information And Communications Technology | 超高速光周波数掃引技術 |
US8861969B2 (en) * | 2006-08-14 | 2014-10-14 | The Regents Of The University Of California | All-optical AM-to-FM up-conversion for radio-over-fiber |
EP2273699A1 (en) * | 2009-06-30 | 2011-01-12 | Alcatel Lucent | A method for bidirectional transmission of signals, and a transceiver therefor |
CN101667983A (zh) * | 2009-09-16 | 2010-03-10 | 华为技术有限公司 | 调制信号的产生方法和传输设备 |
EP2403165A1 (en) * | 2010-07-02 | 2012-01-04 | Alcatel Lucent | Radio frequency system for optical heterodyning |
US10181909B2 (en) * | 2010-10-29 | 2019-01-15 | Zte Corporation (China) | Method and apparatus for optical wireless architecture |
US20130176164A1 (en) * | 2012-01-05 | 2013-07-11 | Harris Corporation | Phased antenna array with electro-optic readout circuit and related methods |
CN103036621B (zh) * | 2012-12-19 | 2015-07-29 | 上海大学 | 一种基于循环移频方式梳状谱发生系统及其应用方法 |
JP6233342B2 (ja) * | 2015-03-31 | 2017-11-22 | 住友大阪セメント株式会社 | 光変調器 |
EP3400485A1 (en) * | 2016-01-07 | 2018-11-14 | Telefonaktiebolaget LM Ericsson (publ) | Opto-electronic oscillator and method of generating an electrical carrier signal |
CN105591698B (zh) * | 2016-03-03 | 2018-06-29 | 苏州大学 | 一种光载无线通信方法及系统 |
CN110926511B (zh) * | 2019-12-06 | 2021-11-26 | 北京工业大学 | 一种宽带高分辨率光谱响应测量方法 |
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JP2000310800A (ja) * | 1999-02-23 | 2000-11-07 | Atr Adaptive Communications Res Lab | 2光信号発生器 |
JP2002135211A (ja) * | 2000-10-20 | 2002-05-10 | Telecommunication Advancement Organization Of Japan | 光多重伝送方式 |
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DE4019224A1 (de) * | 1990-06-15 | 1991-12-19 | Standard Elektrik Lorenz Ag | Funk-nachrichtenuebertragungssystem, insbesondere zellulares mobilfunksystem |
US6211996B1 (en) * | 1999-05-19 | 2001-04-03 | Matsushita Electric Industrial Co., Ltd. | Angle modulator |
KR100474839B1 (ko) * | 2001-03-28 | 2005-03-08 | 삼성전자주식회사 | 광 발진 장치 |
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2004
- 2004-02-26 JP JP2004052303A patent/JP3841793B2/ja not_active Expired - Fee Related
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2005
- 2005-02-21 WO PCT/JP2005/003238 patent/WO2005083915A1/ja active Application Filing
- 2005-02-21 US US10/590,518 patent/US7697846B2/en not_active Expired - Fee Related
- 2005-02-21 CN CN200580009041.6A patent/CN1934806B/zh not_active Expired - Fee Related
- 2005-02-21 KR KR1020067019773A patent/KR101035741B1/ko active IP Right Grant
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000310800A (ja) * | 1999-02-23 | 2000-11-07 | Atr Adaptive Communications Res Lab | 2光信号発生器 |
JP2002135211A (ja) * | 2000-10-20 | 2002-05-10 | Telecommunication Advancement Organization Of Japan | 光多重伝送方式 |
Also Published As
Publication number | Publication date |
---|---|
JP2005244655A (ja) | 2005-09-08 |
US7697846B2 (en) | 2010-04-13 |
CN1934806B (zh) | 2014-11-05 |
CN1934806A (zh) | 2007-03-21 |
US20070206957A1 (en) | 2007-09-06 |
KR20070022669A (ko) | 2007-02-27 |
JP3841793B2 (ja) | 2006-11-01 |
KR101035741B1 (ko) | 2011-05-20 |
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