CN102111223B - Two-waveband radio frequency (RF) optical transmission module - Google Patents
Two-waveband radio frequency (RF) optical transmission module Download PDFInfo
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- CN102111223B CN102111223B CN2011100226930A CN201110022693A CN102111223B CN 102111223 B CN102111223 B CN 102111223B CN 2011100226930 A CN2011100226930 A CN 2011100226930A CN 201110022693 A CN201110022693 A CN 201110022693A CN 102111223 B CN102111223 B CN 102111223B
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Abstract
The invention discloses a two-waveband radio frequency (RF) optical transmission module, comprising a first directional coupler, a down converter, a first filtering module, an analog-to-digital (AD) conversion module, a first baseband processor, a first photoelectric conversion module, a wavelength division multiplexer (WDM), a second photoelectric conversion module, a second baseband processor, a digital-to-analogue (DA) conversion module, a second filtering module, an up converter, a cascade amplifying module, a third filtering module, a second directional coupler and a module monitoring unit. The optical transmission module not only has the advantages of common optical modules, but also has the capability of working in the two-waveband range, thus broadening the range of working efficiency, and solving the problem of resource waste for networking repeatedly. The optical transmission module is used for converting uplink and downlink RF signals into I/Q digital signals by AD conversion in the process of signal transmission, and then the I/Q digital signals are transmitted in the form of frame format in optical fibers by a laser, thereby greatly improving the stability of the signals in the transmission process.
Description
Technical field
A kind of radio frequency communication devices of the present invention, especially relate to a kind of two waveband radio-frequency light transmission module.
Background technology
Present GSM, CDMA and TD-SCDMA, these 3G networks of CDMA2000EV_DO and WCDMA will exist in the quite a long time jointly in China.In the development of these communication systems, huge effect is all being brought into play in repeater, this be due to use in mobile communication system repeater can be economical, fill up blind area rapidly and effectively, improve network quality, bring considerable economic benefit to operator.Radio frequency optical module has been born the Core Feature of optical fiber repeater, directly determined an optical fiber repeater performance, high performance radio frequency optical module can provide automatic light-attenuation compensation function, laser works state auto-compensation, various quantity of state Real-time Collections, analysis, the FSK(frequency shift keying) transparent transmission, automated power detects.Say in some sense some functions that can substitute monitoring repeater, can greatly simplify the design of repeater, reduce the design difficulty of repeater radio frequency (RF) part, facilitate the enforcement of engineering, reduce engineering cost, can improve overlay area simultaneously.
Although present normal optical module on the market has basic photoelectric converting function, FSK passage and attenuation automatic compensation function are provided, and function is controlled in radio frequency amplification, rf gain control, radio frequency detection etc., but the normal optical module can only provide the radio signal transmission of single frequency band, for the communication network of different frequency range, need to design different optical modules.And owing to easily being subjected to external interference in the radio frequency analog signal transmitting procedure, so the stability of signal is also a more scabrous problem.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of digital two-band radio-frequency light transmission module.
The present invention solves the problems of the technologies described above the technical scheme that adopts: a kind of two-band radio-frequency light transmission module, it is characterized in that comprising the first directional coupler, low-converter, the first filtration module, analog-to-digital conversion module, the first baseband processor, the first photoelectric conversion module, wavelength division multiplexer, the second photoelectric conversion module, the second baseband processor, D/A converter module, the second filtration module, upconverter, cascade amplification module, the 3rd filtration module, the second directional coupler and module monitors unit
Described the first directional coupler is connected with described low-converter, described low-converter is connected with described the first baseband processor by the first filtration module, analog-to-digital conversion module successively, described the first baseband processor is connected with described wavelength division multiplexer by the first photoelectric conversion module
Described wavelength division multiplexer is connected with described the second baseband processor by the second photoelectric conversion module, described the second baseband processor is connected with described upconverter by D/A converter module, the second filtration module successively, described upconverter is connected with described cascade amplification module, described cascade amplification module is connected with the second directional coupler by the 3rd filtration module
Described module monitors unit is connected with described cascade amplification module by attenuator,
Described the first directional coupler is connected with described module monitors unit, described low-converter is connected with described module monitors unit, described the first baseband processor is connected with described module monitors unit, and described the first photoelectric conversion module is connected with described module monitors unit
Described the second photoelectric conversion module is connected with described module monitors unit, described the second baseband processor is connected with described module monitors unit, described upconverter is connected with described module monitors unit, and described the second directional coupler is connected with described module monitors unit.
Described low-converter comprises the first frequency mixer, the second frequency mixer, the first 90-degree phase shifter and the first local oscillator,
Described the first filtration module comprises the first high pass filter, the first automatic gain controller, the first low pass filter, the second high pass filter, the second automatic gain controller and the second low pass filter,
Described analog-to-digital conversion module comprises the first analog to digital converter, the second analog to digital converter and the first synthesizer,
Described the first photoelectric conversion module comprises laser,
Described the second photoelectric conversion module comprises laser detector,
Described D/A converter module comprises the first digital to analog converter and the second digital to analog converter,
Described the second filtration module comprises the 3rd low pass filter, the 4th low pass filter, third high bandpass filter and the 4th high pass filter,
Described upconverter comprises three-mixer, the 4th frequency mixer, the second 90-degree phase shifter, the second local oscillator and the second synthesizer,
Described cascade amplification module comprises radio-frequency (RF) switch, the first low noise amplifier and the second low noise amplifier,
Described the 3rd filtration module comprises the first band pass filter and the second band pass filter,
Described module monitors unit comprises that model is the micro-control unit of C8051F series,
Described the first directional coupler respectively with the first frequency mixer be connected frequency mixer and be connected, described the first 90-degree phase shifter respectively with the first frequency mixer be connected frequency mixer and be connected,
Described the first frequency mixer is connected with described the first high pass filter, described the first high pass filter is by described the first automatic gain controller and described the first low pass filter, described the second frequency mixer is connected with described the second high pass filter, described the second high pass filter is by the second automatic gain controller and described the second low pass filter
Described the first low pass filter is connected with described the first analog to digital converter, described the second low pass filter is connected with described the second analog to digital converter, described the first analog to digital converter be connected the second analog to digital converter and be connected with described the first synthesizer respectively
Described the first synthesizer is connected with described the first baseband processor, described the first baseband processor is connected with described wavelength division multiplexer by described laser, described wavelength division multiplexer is connected with described the second baseband processor by described laser detector
Described the second baseband processor respectively with described the first digital to analog converter be connected digital to analog converter and be connected,
Described the first digital to analog converter is connected with described third high bandpass filter by the 3rd low pass filter,
Described the second digital to analog converter is connected with described the 4th high pass filter by the 4th low pass filter,
Described third high bandpass filter is connected with described three-mixer, described the 4th high pass filter is connected with described the 4th frequency mixer, described three-mixer is connected with described the second 90-degree phase shifter respectively with the 4th frequency mixer, described three-mixer is connected with described the second mixer respectively with the 4th frequency mixer
Described the second mixer is connected with radio-frequency (RF) switch, described radio-frequency (RF) switch respectively with the first low noise amplifier be connected low noise amplifier and be connected,
The first low noise amplifier is connected with the first band pass filter, and the second low noise amplifier is connected with the second band pass filter, described the first band pass filter be connected the second band pass filter and be connected with described the second directional coupler respectively,
Described the first directional coupler is connected with described micro-control unit by the 3rd analog to digital converter,
Described micro-control unit is connected with described the first 90-degree phase shifter by described the first local oscillator,
Described micro-control unit is connected with described the first automatic gain controller, and described micro-control unit is connected with described the second automatic gain controller,
Described laser is connected with described micro-control unit by the bias current detection module, described laser is connected with described micro-control unit by luminous detection module, described laser arranges module by luminous power and is connected with described micro-control unit
Described micro-control unit is successively by transceiving chip, the first Surface Acoustic Wave Filter and the 4th analog to digital converter and described the first baseband processor, described micro-control unit is connected with the second baseband processor by described transceiving chip, the second Surface Acoustic Wave Filter and the 5th analog to digital converter successively
Described laser detector is connected with described micro-control unit by receiving photodetector,
Described micro-control unit is connected with described the first low noise amplifier by attenuator, and described micro-control unit is connected with described the second low noise amplifier by described attenuator,
Described micro-control unit is connected with described the second 90-degree phase shifter by described the second local oscillator,
Described micro-control unit is connected with described radio-frequency (RF) switch,
Described the second directional coupler is connected with described micro-control unit by the 6th analog to digital converter,
Serial ports is connected with described micro-control unit by level translator.
Compared with prior art, the invention has the advantages that and possess the ability that can be operated in the two-band scope, therefore widened operating frequency range, and solve the wasting of resources problem that repeats networking.And then by laser, transmit with frame format in optical fiber owing in signals transmission, the radiofrequency signal of up-downgoing being converted to the I/Q digital signal through AD, therefore greatly improved the stability of signal in transmitting procedure.
Description of drawings
Fig. 1 is structured flowchart of the present invention;
Fig. 2 is structure chart of the present invention.
Embodiment
Embodiment is described in further detail the present invention below in conjunction with accompanying drawing.
A kind of two-band radio-frequency light transmission module, comprise the first directional coupler 1, low-converter 2, the first filtration module 3, analog-to-digital conversion module 4, the first baseband processor 5, the first photoelectric conversion module 6, wavelength division multiplexer 7, the second photoelectric conversion module 8, the second baseband processor 9, D/A converter module 10, the second filtration module 11, upconverter 12, cascade amplification module 13, the 3rd filtration module 14, the second directional coupler 15 and module monitors unit 16
The first directional coupler 1 is connected with low-converter 2, and low-converter 2 is connected with the first baseband processor 5 by the first filtration module 3, analog-to-digital conversion module 4 successively, and the first baseband processor 5 is connected with wavelength division multiplexer 7 by the first photoelectric conversion module 6,
The first directional coupler 1 is connected with module monitors unit 16, and low-converter 2 is connected with module monitors unit 16, and the first baseband processor 5 is connected with module monitors unit 16, and the first photoelectric conversion module 6 is connected with module monitors unit 16,
The second photoelectric conversion module 8 is connected with module monitors unit 16, and the second baseband processor 9 is connected with module monitors unit 16, and upconverter 12 is connected with module monitors unit 16, and the second directional coupler 15 is connected with module monitors unit 16.
Low-converter 2 comprises the first frequency mixer 21, the second frequency mixer 22, the first 90-degree phase shifter 23 and the first local oscillator 24,
The first filtration module 3 comprises the first high pass filter 31, the first automatic gain controller 32, the first low pass filter 33, the second high pass filter 34, the second automatic gain controller 35 and the second low pass filter 36,
Analog-to-digital conversion module 4 comprises the first analog to digital converter 41, the second analog to digital converter 42 and the first synthesizer 43,
The first photoelectric conversion module 6 comprises laser 61,
The second photoelectric conversion module 8 comprises laser detector 81,
D/A converter module 10 comprises the first digital to analog converter 101 and the second digital to analog converter 102,
The second filtration module 11 comprises the 3rd low pass filter 111, the 4th low pass filter 112, third high bandpass filter 113 and the 4th high pass filter 114,
Cascade amplification module 13 comprises radio-frequency (RF) switch 131, the first low noise amplifier 132 and the second low noise amplifier 133,
The 3rd filtration module 14 comprises the first band pass filter 141 and the second band pass filter 142,
The first directional coupler 1 respectively with the first frequency mixer 21 be connected frequency mixer 22 and be connected, the first 90-degree phase shifter 23 respectively with the first frequency mixer 21 be connected frequency mixer 22 and be connected,
The first frequency mixer 21 is connected with the first high pass filter 31, the first high pass filter 31 is by the first automatic gain controller 32 and the first low pass filter 33, the second frequency mixer 22 is connected with the second high pass filter 34, the second high pass filter 34 is by the second automatic gain controller 35 and the second low pass filter 36
The first low pass filter 33 is connected with the first analog to digital converter 41, and the second low pass filter 36 is connected with the second analog to digital converter 42, the first analog to digital converter 41 be connected analog to digital converter 42 and be connected with the first synthesizer 43 respectively,
The first synthesizer 43 is connected with the first baseband processor 5, and the first baseband processor 5 is connected with wavelength division multiplexer 7 by laser 61, and wavelength division multiplexer 7 is connected with the second baseband processor 9 by laser detector 81,
The second baseband processor 9 respectively with the first digital to analog converter 101 be connected digital to analog converter 102 and be connected,
The first digital to analog converter 101 is connected with third high bandpass filter 113 by the 3rd low pass filter 111,
The second digital to analog converter 101 is connected with the 4th high pass filter 114 by the 4th low pass filter 112,
Third high bandpass filter 113 is connected with three-mixer 121, the 4th high pass filter 114 is connected with the 4th frequency mixer 122, three-mixer 121 is connected with the second 90-degree phase shifter 123 respectively with the 4th frequency mixer 122, three-mixer 121 is connected with the second mixer 125 respectively with the 4th frequency mixer 122
The second mixer 125 is connected with radio-frequency (RF) switch 131, radio-frequency (RF) switch 131 respectively with the first low noise amplifier 132 be connected low noise amplifier 133 and be connected,
The first low noise amplifier 132 is connected with the first band pass filter 141, and the second low noise amplifier 133 is connected with the second band pass filter 142, the first band pass filter 141 be connected band pass filter 142 and be connected with the second directional coupler 15 respectively,
The first directional coupler 1 is connected with micro-control unit 161 by the 3rd analog to digital converter 162,
The second directional coupler 15 is connected with micro-control unit 161 by the 6th analog to digital converter 172,
Operation principle of the present invention:
One, radio frequency signal is to digital optical signal:
The present invention in use, is paired use, is defined as respectively this module (local module) and remote end module.This module rf inputs input radio frequency signal, radiofrequency signal after the first directional coupler 1, is divided into two-way, is respectively main signal link and coupling road.Main signal link (most of signal) is by the first frequency mixer 21 and the second frequency mixer 22, two frequency mixers down-convert the signals to respectively base band in-phase component (I) and quadrature component (Q) signal, in-phase component signal and orthogonal component signal respectively by high pass filter 31,34, automatic gain controller 32,35(by its decay size of micro-control unit controls) and low pass filter 33,36 after, carry out analog-to-digital conversion, obtain base-band digital I and Q signal, carry out Base-Band Processing after base-band digital I and Q signal is synthetic.Become digital optical signal through the frame format digital signal after Base-Band Processing after laser 61, digital optical signal sends to remote end module by wavelength division multiplexer 7.Coupling road signal (small part signal) is by after A/D converter 162 sampling detections, send into microcontroller (MCU) unit 161, the signal center frequency that microcontroller (MCU) unit 161 bases detect is controlled the local frequency for the first local oscillator 24 of down-conversion, local oscillation signal obtains two local oscillation signals through the one 90 degree phase-shifter 23 again, respectively homophase local vibration source and out-phase local vibration source, the homophase local vibration source is controlled the frequency mixer that carries out the in-phase component down-conversion, and the out-phase local vibration source is used for controlling the out-phase component down-conversion mixer.Micro-control unit 161, according to the size of input radio frequency signal power, is adjusted the decay size of automatic gain controller.
Two: fsk signal is to digital optical signal:
computer is by the serial ports 173 and this module communication of this module, frequency shift keying (FSK) information exchange that computer sends is crossed serial ports 173 and is sent in level translator 174, send to microcontroller (MCU) unit 161 after level conversion, after 161 pairs of unit of microcontroller (MCU) input signal is processed, send to transceiving chip 166, signal after transceiving chip 166 modulation is after the filtering of sound table, carry out again analog-to-digital conversion, digital signal after conversion is passed through Base-Band Processing again, frame format signal after Base-Band Processing becomes digital optical signal by laser 61 again, digital optical signal sends to remote end module by wavelength division multiplexer 7.
Three: digital optical signal is to radio frequency signal:
the digital optical signal that remote end module sends over becomes digital electric signal by laser detector 81, at this moment digital electric signal has the digital electric signal of FSK communication use, the digital electric signal that also has radio communication to use, after Base-Band Processing, I and the Q signal of the digital electric signal that radio communication is used are separated, I after separation and Q signal are again by digital-to-analogue conversion, become analog signal, in order to eliminate high frequency component signal and dc shift, base-band analog signal is by low pass filter and high pass filter, base-band analog signal after filtering is processed is up-converted into needed radio frequency analog I and Q signal by frequency mixer with base-band analog signal again, after radio frequency analog I and Q signal are synthetic, by a radio-frequency (RF) switch 131, difference according to the signal working frequency range, switch is selected low noise amplification path and filtering path, amplification path adopts the low noise amplifier circuit of three-stage cascade.Pass through again the second directional coupler 15 through amplification and filtered signal, the radiofrequency signal that the second directional coupler 15 amplifies major part is exported away, the part signal of coupling is after A/D converter 176 sampling detections, send to microcontroller (MCU) unit 161, detect thus the size of power output, adjusted the pad value of attenuator by the size of power output, thereby adjust power output.Radio-frequency (RF) switch 131 is controlled by microcontroller (MCU) unit 161, frequency mixer provides local oscillation signal by outside, local oscillation signal is produced by the second local oscillator 124, and by the second 90-degree phase shifter 123, adjust phase place, the output frequency of the second local oscillator 124 is controlled by microcontroller (MCU) unit 161.
Four: digital optical signal is to fsk signal:
the digital optical signal that remote end module sends over becomes the digital signal signal of telecommunication by laser detector 81, at this moment digital electric signal has the signal that the signal of FSK communication use also has radio communication to use, after Base-Band Processing, isolate the digital electric signal of FSK communication use, digital electric signal becomes analog signal after digital-to-analogue conversion, analog signal is again by sending to transceiving chip 166 after filtering, after the analog signal of 166 pairs of inputs of transceiving chip is carried out demodulation process, send to microcontroller (MCU) unit 161, after processing, microcontroller (MCU) unit 161 sends to level translator 174, after level translation, fsk signal sends on computer.
Five: monitor portion:
Send out the luminous power of merit power-sensing circuit (it comprises bias current detection module 163, luminous detection module 164 and luminous power detection module 165) detection laser 61 by offset laser, send warning information when 161 pairs of unit of microcontroller (MCU) luminous power is excessive or when too small., by the bias current of bias current detection module 163 detection laser 61, adjusted the size of bias current by microcontroller (MCU) unit 161.Receive the receipts luminous power of photodetector 171 detection laser detectors 81 by laser detector, 161 pairs of microcontroller (MCU) the unit size of receiving luminous power judges, and sends warning information.
Claims (1)
1. two-band radio-frequency light transmission module, it is characterized in that comprising the first directional coupler, low-converter, the first filtration module, analog-to-digital conversion module, the first baseband processor, the first photoelectric conversion module, wavelength division multiplexer, the second photoelectric conversion module, the second baseband processor, D/A converter module, the second filtration module, upconverter, cascade amplification module, the 3rd filtration module, the second directional coupler and module monitors unit
Described the first directional coupler is connected with described low-converter, described low-converter is connected with described the first baseband processor by the first filtration module, analog-to-digital conversion module successively, described the first baseband processor is connected with described wavelength division multiplexer by the first photoelectric conversion module
Described wavelength division multiplexer is connected with described the second baseband processor by the second photoelectric conversion module, described the second baseband processor is connected with described upconverter by D/A converter module, the second filtration module successively, described upconverter is connected with described cascade amplification module, described cascade amplification module is connected with the second directional coupler by the 3rd filtration module
Described module monitors unit is connected with described cascade amplification module by attenuator,
Described the first directional coupler is connected with described module monitors unit, described low-converter is connected with described module monitors unit, described the first baseband processor is connected with described module monitors unit, and described the first photoelectric conversion module is connected with described module monitors unit
Described the second photoelectric conversion module is connected with described module monitors unit, described the second baseband processor is connected with described module monitors unit, described upconverter is connected with described module monitors unit, and described the second directional coupler is connected with described module monitors unit;
Described low-converter comprises the first frequency mixer, the second frequency mixer, the first 90-degree phase shifter and the first local oscillator,
Described the first filtration module comprises the first high pass filter, the first automatic gain controller, the first low pass filter, the second high pass filter, the second automatic gain controller and the second low pass filter,
Described analog-to-digital conversion module comprises the first analog to digital converter, the second analog to digital converter and the first synthesizer,
Described the first photoelectric conversion module comprises laser,
Described the second photoelectric conversion module comprises laser detector,
Described D/A converter module comprises the first digital to analog converter and the second digital to analog converter,
Described the second filtration module comprises the 3rd low pass filter, the 4th low pass filter, third high bandpass filter and the 4th high pass filter,
Described upconverter comprises three-mixer, the 4th frequency mixer, the second 90-degree phase shifter, the second local oscillator and the second synthesizer,
Described cascade amplification module comprises radio-frequency (RF) switch, the first low noise amplifier and the second low noise amplifier,
Described the 3rd filtration module comprises the first band pass filter and the second band pass filter,
Described module monitors unit comprises that model is the micro-control unit of C8051F series,
Described the first directional coupler respectively with the first frequency mixer be connected frequency mixer and be connected, described the first 90-degree phase shifter respectively with the first frequency mixer be connected frequency mixer and be connected,
Described the first frequency mixer is connected with described the first high pass filter, described the first high pass filter is connected with described the first low pass filter by described the first automatic gain controller, described the second frequency mixer is connected with described the second high pass filter, described the second high pass filter is connected with described the second low pass filter by the second automatic gain controller
Described the first low pass filter is connected with described the first analog to digital converter, described the second low pass filter is connected with described the second analog to digital converter, described the first analog to digital converter be connected the second analog to digital converter and be connected with described the first synthesizer respectively
Described the first synthesizer is connected with described the first baseband processor, described the first baseband processor is connected with described wavelength division multiplexer by described laser, described wavelength division multiplexer is connected with described the second baseband processor by described laser detector
Described the second baseband processor respectively with described the first digital to analog converter be connected digital to analog converter and be connected,
Described the first digital to analog converter is connected with described third high bandpass filter by the 3rd low pass filter,
Described the second digital to analog converter is connected with described the 4th high pass filter by the 4th low pass filter,
Described third high bandpass filter is connected with described three-mixer, described the 4th high pass filter is connected with described the 4th frequency mixer, described three-mixer is connected with described the second 90-degree phase shifter respectively with the 4th frequency mixer, described three-mixer is connected with described the second synthesizer respectively with the 4th frequency mixer
Described the second synthesizer is connected with radio-frequency (RF) switch, described radio-frequency (RF) switch respectively with the first low noise amplifier be connected low noise amplifier and be connected,
The first low noise amplifier is connected with the first band pass filter, and the second low noise amplifier is connected with the second band pass filter, described the first band pass filter be connected the second band pass filter and be connected with described the second directional coupler respectively,
Described the first directional coupler is connected with described micro-control unit by the 3rd analog to digital converter,
Described micro-control unit is connected with described the first 90-degree phase shifter by described the first local oscillator,
Described micro-control unit is connected with described the first automatic gain controller, and described micro-control unit is connected with described the second automatic gain controller,
Described laser is connected with described micro-control unit by the bias current detection module, described laser is connected with described micro-control unit by luminous detection module, described laser arranges module by luminous power and is connected with described micro-control unit
Described micro-control unit is connected with described the first baseband processor with the 4th analog to digital converter by transceiving chip, the first Surface Acoustic Wave Filter successively, described micro-control unit is connected with the second baseband processor by described transceiving chip, the second Surface Acoustic Wave Filter and the 5th analog to digital converter successively
Described laser detector is connected with described micro-control unit by receiving photodetector,
Described micro-control unit is connected with described the first low noise amplifier by attenuator, and described micro-control unit is connected with described the second low noise amplifier by described attenuator,
Described micro-control unit is connected with described the second 90-degree phase shifter by described the second local oscillator,
Described micro-control unit is connected with described radio-frequency (RF) switch,
Described the second directional coupler is connected with described micro-control unit by the 6th analog to digital converter,
Serial ports is connected with described micro-control unit by level translator.
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| CN2011100226930A CN102111223B (en) | 2010-11-11 | 2011-01-20 | Two-waveband radio frequency (RF) optical transmission module |
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| CN2011100226930A CN102111223B (en) | 2010-11-11 | 2011-01-20 | Two-waveband radio frequency (RF) optical transmission module |
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| CN103166701B (en) * | 2013-02-27 | 2015-09-30 | 华为技术有限公司 | The method of parameter negotiation, transmitting apparatus, receiving equipment and optical module in optical transport |
| WO2015042920A1 (en) * | 2013-09-29 | 2015-04-02 | 华为技术有限公司 | Quadrature mixing device |
| CN105337668A (en) * | 2015-07-01 | 2016-02-17 | 南京泰通科技股份有限公司 | High-reliability 400MHz railway flat-regulation digital optical fiber repeater |
| CN106209124A (en) * | 2016-09-09 | 2016-12-07 | 桂林电子科技大学 | A kind of antenna assembly of integrated RF front-end circuit |
| US11579294B2 (en) * | 2018-09-14 | 2023-02-14 | GM Global Technology Operations LLC | Lidar system with integrated frequency shifter for true doppler detection |
| CN110988845B (en) * | 2019-10-25 | 2023-08-01 | 西安电子科技大学 | Laser echo signal conditioning circuit |
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| CN200973095Y (en) * | 2004-11-05 | 2007-11-07 | 京信通信系统（广州）有限公司 | Mobile communication digital optical fibre directly amplifying application system |
| US7394990B1 (en) * | 2005-05-26 | 2008-07-01 | Lockheed Martin Corporation | All optical wavelength converter |
| CN201118599Y (en) * | 2007-11-15 | 2008-09-17 | 华为技术有限公司 | An optical module device and host board |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200973095Y (en) * | 2004-11-05 | 2007-11-07 | 京信通信系统（广州）有限公司 | Mobile communication digital optical fibre directly amplifying application system |
| US7394990B1 (en) * | 2005-05-26 | 2008-07-01 | Lockheed Martin Corporation | All optical wavelength converter |
| CN201118599Y (en) * | 2007-11-15 | 2008-09-17 | 华为技术有限公司 | An optical module device and host board |
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