CN102355307A - Broadband radio frequency light modulation and demodulation method - Google Patents
Broadband radio frequency light modulation and demodulation method Download PDFInfo
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- CN102355307A CN102355307A CN2011101800142A CN201110180014A CN102355307A CN 102355307 A CN102355307 A CN 102355307A CN 2011101800142 A CN2011101800142 A CN 2011101800142A CN 201110180014 A CN201110180014 A CN 201110180014A CN 102355307 A CN102355307 A CN 102355307A
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Abstract
The invention provides a broadband radio frequency light modulation and demodulation method. Optical modem signal receiving photoelectricity converter, a center processor and an electro-optical emission converter form signal connection. After a broadband radio frequency light signal is converted and loaded, optical cable transmission is performed through the electro-optical emission converter. In the invention, the bidirectional receiving photoelectricity converter and the electro-optical emission converter are used to connect with a computer so as to perform modulation and demodulation of the signal. Therefore, the broadband radio frequency signal can be directly converted into an electrical signal and the electrical signal is transmitted to an optical cable through the electro-optical emission converter. A structure of equipment is simple. The broadband radio frequency signal is lossless and a signal conversion speed is fast. The method is suitable for being applied in the modulation and the demodulation of the broadband radio frequency light signal.
Description
Technical field
What the present invention proposed is the signal processing technology of communication field, the demodulation method of wide band radio-frequency light modulation specifically.
Background technology
At present at communication field; With China is in the unification of three nets mechanics of communication of main body; Simultaneously need be to optical fiber cables signal, telephone audio signal and on-air radio microwave signal Unified Treatment; And modulate output; Need carry out the amalgamation transformation to original single communication signal transmission equipment, to adapt to the needs of unification of three nets mechanics of communication.
In broadband signal, the light signal that comes from optical cable needs modulation in signal transmission apparatus, to move.
Adopt optical fiber transmission signal in the optical communication field, optical fiber is a kind of waveguide medium that transmits luminous energy, generally is made up of fibre core and covering.
Light Access Network (OAN) is the Access Network that adopts optical fiber transmission technique, the i.e. communication system of all or part of employing Optical Fiber Transmission between local switch and the user.Advantages such as optical fiber has that bandwidth is wide, the long-distance transmissions ability is strong, good confidentiality, antijamming capability are strong are the main implementation technique of following Access Network.The FTTX access waies that adopt, wherein the FTTH mode refers among the optical fiber direct user man, generally only needs a subscribers feeder more.
Radio frequency (RF) is the abbreviation of Radio Frequency, and expression can be radiated the electromagnetic frequency in space, and frequency range is between 300KHz～30GHz.It is exactly radio-frequency current that radio frequency is called for short the RF radio frequency, and it is that a kind of high-frequency ac changes electromagnetic abbreviation.The alternating current that per second changes less than 1000 times is called low-frequency current, greater than 10000 times the high-frequency current that is called, and radio frequency a kind of high-frequency current that comes to this.
Modulation: various digital baseband signals are converted to the digital modulation signals (modulated signal or band signal) that is suitable for Channel Transmission;
Demodulation: the digital band signal of receiving is reduced into digital baseband signal at receiving terminal. the time domain definition:
Modulation is exactly the variation of removing to control one or several parameter of carrier signal with baseband signal; The information load is formed the modulated signal transmission thereon; And demodulation is the anti-process of modulation, from the parameter variation of modulated signal, will recover original baseband signal through concrete method.
The frequency domain definition:
Modulation be exactly with the frequency spectrum shift of baseband signal in channel passband or the process on certain frequency range wherein, and demodulation is the anti-process that will the band signal in the channel reverts to baseband signal.
According to the difference of the signal parameter of being controlled, modulation can be divided into:
Amplitude modulation, the modulation system that the amplitude of carrier wave is changed along with the size variation of modulation signal.
Frequency modulation makes the instantaneous frequency of carrier wave become along with the size of modulation signal, and the modulation system that amplitude remains unchanged.
Phase modulation utilizes primary signal to control the phase place of carrier signal.
The purpose of modulation is the signal that the analog signal that will transmit or digital signal conversion is become to be fit to Channel Transmission, this with regard to mean baseband signal (information source) change into frequency with regard to the relative base band frequency very high for messenger.This signal is called modulated signal, and baseband signal is called modulation signal.Modulation can realize with amplitude, phase place or the frequency that the variation of signal amplitude changes carrier wave through making high frequency carrier.Modulated process is used for making a start of communication system.Need modulated signal is reduced into the primary signal that will transmit at receiving terminal, just baseband signal is extracted from carrier wave so that the process that predetermined acceptance person's (stay of two nights) handles and understands.This process is called demodulation.Our Modem of often saying of modulator-demodulator is the abbreviation of Modulator (modulator) and Demodulator (demodulator) in fact, and Chinese is called modulator-demodulator.Also the someone follows the partials according to Modem, is referred to as " cat " cheek by jowl.We know, the information in the computer is formed digital signal by " 0 " and " 1 ", and what pass in phone line can only be analog electrical signal (analog signal is continuous, and digital signal is what be interrupted).So, when two computers will carry out transfer of data through telephone wire, just need an equipment to be responsible for the conversion of digital-to-analogue.This digital to analog converter is exactly the Modem that will discuss here.Computer converts digital signal into corresponding analog signal by Modem earlier when sending data, this process is called " modulation ", also becomes the D/A conversion.Before the signal of ovennodulation is sent to another computer through telephone carrier, also to be responsible for analog signal is reduced to the digital signal of calculating function identification via recipient's Modem, we claim " demodulation " this process, also claim A/D conversion.Digital-to-analogue conversion process through such one " modulation " and " demodulation " just, thus realized the telecommunication between two computers.
A kind of optical modem is arranged: the original producton location: U.S.'s purposes: for the networked meters apparatus system provides distributed data communication; The metering device network need have immunity to lightning and power switch transition; Reliable communication between device node with high epd; Under the situation that does not have communication contention aware between network node, carry out multipoint access; Not being subjected to protocols limit --- Model1430FOL can replace many cable networks system; For OutDAQ and 2300 system and devices provide independently high-speed transfer, can be that a kind of the transmission with receiver by optical fiber converts the RS-232 signal to the signal of optical fiber compatibility data communications equipment as the general introduction of the range product between the fibre optic repeater section of increasing: GEOMATIONModel1430FOL.This design allow point-to-point and chain type some multiple spot is connected.Special logic control and optical interface allow FOLs in the one-to-many network, to work under the situation of data collision not having, and keep low-down average power consumption and every section fed distance up to 5Km simultaneously.Message transmission rate is confirmed by the RS-232 transmission signal of connected equipment, and the straight fall delay that carrier wave detects is automatically along with message transmission rate is adjusted in the hope of compatibility.Model 1430 FOLs are not subjected to protocols limit fully, allow the application of common purposes.Also permission and many supplies of equipment system integration are together.The message transmission rate that FOLs supports from 1200bps to 115 kbps.Data activity can be through three LED monitoring on the front panel.Each Model 1430 F O L s comprises two communication interface channel A and B with independent optical transmitter and receiver.RS-232 signals that send FOLs to are connected with the transmitter TX of interface channel A and B.The multiplexed RX fiber receiver both in the passage A of fiber optic receiver and the inside of B is connected to R S-2 32 and receives line.When not having RS-232 to connect, 1430 also can be used as fibre-optic repeater.Model 1430 F O L s connect with the system 2300 that has 23 80 M C U s
MouthfulConnect, see how technical descriptioon 17-208-03 " uses the 1430 type optical fiber connector (FOLs) with 2300 systems ".
Features: 1.? Use 62.5/125μ? M?, And 50/125? Μm? Fiber optic cable (multi-style fiber) 2.? Use and can usually provide on-site installation type ST light plug 3.? Data communication speed is 1200bps to 115kbps4.? neighboring Model? 1430? FOL distance between the up 5km5.? a fiber-optic network can install up 250FOLs6.? wide input voltage range: 7 -? 30? VDC7.? Very low power consumption - - Compatible with battery power generator Technical parameters: Input supply voltage 7-30VDC? Consumption 500mW standby 1.5W? (transfer) data connection fiber four separate ST-type socket Channel A: TX?, RX Channel B: TX?, RX? maximum fiber segment spacing 5km? Wavelength 1300nm? fiber network topology linear (non-closed)? FOLs on each network the maximum amount of 250? RS-232 port 10-pin Amp 794619 (Cable w / inside with mating connector) to the chassis ground connection on the 6th screw terminal Indicator LED Carrier Detect (CD?) transmitting terminal (TD?) receiver (RD?) physical properties of the input power Material C1010 steel? Surface treatment galvanized: ASTM?-B633 painted dark gray? size See outline drawing? weight of 380 g (13.4 oz)? install 35 × 7.5mm transport cross bar DIN / EN standard 50022 Environmental Temperature '-40 ℃ to 85 ℃ (work)? pressure altitude 0 to 5400m? relative humidity 0-95% (not condensing).Speech pattern mainly provides telephonograph message and full duplex hand-free call function, and phone and computer are combined together.That here, we mainly discuss is a kind of new voice transfer pattern-DSVD (Digital Simultaneous Voice and Data).DSVD is by the voice transmission standards of companies such as Hayes, Rockwell, U.s.Robotics, Intel in the nineteen ninety-five proposition, is the expansion of existing V.42 error-correction protocol.DSVD converses while make Modem on ordinary telephone line, carry out transfer of data through adopting digital speech and the data simultaneous interpretation technology of Digi Talk.
The bandwidth (Modem that also has keeps the bandwidth of 8.5K) that DSVD Modem has kept 8K is used for the voice transmission, and remaining bandwidth then is used for transfer of data.Voice can compress earlier before transmission, and the aggregation of data that transmits with needs is sent to the other user through telephone carrier together then.At receiving terminal, Modem comes voice and data separating earlier, again voice signal is carried out decompress(ion) and D/A switch, thus the simultaneous interpretation of the data/voice of realizing.DSVD Modem has a wide range of applications at aspects such as remote teaching, collaborative work, online games.
Through patent retrieval, 3 related patent U.S. Patent No. are arranged, its claims are following:
1. 200410020745.0 optic fiber grating wavelength demodulation method is characterized in that using in pairs the fiber grating that is cascaded, and the foveal reflex wavelength difference of a pair of fiber grating is less than half of single fiber grating reflection bandwidth.
A kind of optic fiber grating wavelength demodulation method according to claim 1, its characteristic also are a pair of fiber grating that is cascaded, and using its foveal reflex wavelength difference is that 1/4 place that finishes of the single fiber grating zone of reflections is as quiescent point.
3. a kind of optic fiber grating wavelength demodulation method according to claim 1 and 2, its characteristic also is to adopt wideband light source, the right reflected optical power of fiber grating that is cascaded through the photoelectric detector measurement realizes Wavelength demodulation.
4. according to claim 1,2 or 3 described a kind of optic fiber grating wavelength demodulation methods, its characteristic also is to use light-splitting device to come the separately back light of each measuring optical fiber grating pair, realizes distributed sensing.
200510019332.5; 1; A kind of multichannel optical fibre grating high-speed demodulating apparatus based on embedded technology; By the high speed acquisition signal source; The SoC single-chip microcomputer high-Speed Data-Acquisition Module of Cygnal; ARM7 embedded microprocessor control module; 10M/100M network communication module; The nRF905 wireless communication module; 12 DA modular converters; The UART communication module; The flash memory module; Compositions such as the monitoring software module of PC end; Wherein the high speed acquisition signal source is connected with the SoC single-chip microcomputer high-Speed Data-Acquisition Module of Cygnal through special purpose interface; 10M/100M network communication module; 12 DA modular converters; The UART communication module; " the h memory module all is connected with ARM7 embedded microprocessor control module f1, and the monitoring software module of PC end is through being connected with 10M/100M network or wireless communication module based on ICP/IP protocol.
2, the multichannel optical fibre grating high-speed demodulating apparatus based on embedded technology as claimed in claim 1; It is characterized in that: the SoC single-chip microcomputer high-Speed Data-Acquisition Module of Cygnal is through SPI universal serial bus and ARM7 embedded microprocessor control module transmission data, and ARM7 embedded microprocessor control module is through the monitoring software module transmission data of 10M/100M Ethernet module or nRF905 wireless module and PC end.
3, the multichannel optical fibre grating high-speed demodulating apparatus based on embedded technology as claimed in claim 1; It is characterized in that: ARM7 embedded microprocessor control module is through 12 D/A converters control F-P filter scan voltages, scan tuning voltage from motion tracking.
4, as claimed in claim 1, wherein based on the embedded technology high speed multi-channel fiber grating demodulation device, characterized in that: the source-speed acquisition optical sensor array includes five connecting passage, the sensor system to protect and stabilize the filter module and the fiber FP scans the control module, 5 optical sensor input channel consists of four measurement channels and a reference channel structure, wherein the sensor module provides system protection and stability of the system voltage stability of the functional modules and the system is in an overcurrent or overvoltage sensor ultra- range and other abnormal operating conditions, the sensor system provides optical isolation voltage limiting protection and alarm signals; fiber F-P filter standard precision scanning control module generates the ramp function control F-P filter sweep voltage.
200620066822.0; 1, a kind of multi-channel fiber Bragg grating demodulator; It is characterized in that; Comprise the single-chip microprocessor MCU of communicating by letter and being connected with host computer; This single-chip microprocessor MCU is connected through communication interface with host computer; Said single-chip microprocessor MCU signal output interface is connected with the signal input interface of first D/A converter, and the signal output interface of this first D/A converter is connected with SLED LASER Light Source and mems optical switch, and mems optical switch is connected with some gratings; Also comprise a DSP signal processor; Be connected with DSP signal processor signal output interface-' the m/A transducer; The signal output interface of this second D/A converter is connected with one drive circuit, and drive circuit is connected with the adjustable F of MEMS-P cavity filter signal input interface; The signal input interface of said DSP signal processor also is connected to an A/D converter, and the signal input interface of this A/D converter is connected with a photodetector: said SLED LASER Light Source, mems optical switch, MEMS is adjustable, and the F-P cavity filter is coupled through an optical fiber and a coupler.
2, multi-channel fiber Bragg grating demodulator according to claim 1 is characterized in that, between said single-chip microprocessor MCU and DSP signal processor, also is connected with and enjoys reservoir altogether.
3, multi-channel fiber Bragg grating demodulator according to claim 1 is characterized in that, described communication interface is RS-232 serial communication interface.
4, multi-channel fiber Bragg grating demodulator according to claim 1 is characterized in that, it is 1X2 that said mems optical switch adopts array, and its type of drive is a static driven.
5, multi-channel fiber Bragg grating demodulator according to claim 1 is characterized in that, said first D/A converter, second D/A converter are the voltage-type D/A converters that adopts single supply, parallel interface, the output of multichannel full scale.
6, multi-channel fiber Bragg grating demodulator according to claim 1 is characterized in that, said A/D converter be adopt single supply ,-the voltage-type A/D converter of parallel interface, the output of multichannel full scale.
7, multi-channel fiber Bragg grating demodulator according to claim 1 is characterized in that, said host computer is to have the processor that the PC of RS-232 serial communication interface maybe can be communicated by letter.
8, multi-channel fiber Bragg grating demodulator according to claim 1 is characterized in that, said DSP signal processor also is connected with a FALSH ROM of extension storage system.
For the existing unification of three nets communication that grows up, present wide band radio-frequency optical modem is difficult to adapt to.Exist the radio frequency optical range narrow, the defective that the modulation function is few.
Summary of the invention
In order to realize the modulation of wide band radio-frequency light signal, the present invention proposes wide band radio-frequency light modulation demodulation method.This method receives optical-electrical converter through signal and receives the wide band radio-frequency light signal and be converted into the signal of telecommunication; The signal of telecommunication imports into through signal processor and carries out the signal modulation in the computer; Signal after the modulation and loading data are through change light signal into through the emission electrical to optical converter after the Computer Processing again; Carry out the signal transmission through transmission cable, solve the modulation-demodulation technique problem of wide band radio-frequency light.
The scheme that technical solution problem of the present invention is adopted is:
The reception optical cable of optical modem one side is connected with signal reception optical-electrical converter and transfers signals in the signal processor through holding wire; Signal processor is connected with the emission electrical to optical converter through holding wire, on the emission optical-electrical converter, is connected with transmission cable.
The wide band radio-frequency light signal is transferred in the reception optical-electrical converter through receiving optical cable; Convert light signal into the signal of telecommunication through receiving optical-electrical converter; With the signal of telecommunication after the conversion through the signal processor of transmission line in the computer; Program software through signal processor; The signal of telecommunication that will come from light signal is understood through terminal equipment; To need the loaded data signal to arrive the emission electrical to optical converter through computer simultaneously through transmission line; Change the signal of telecommunication into light signal through the emission electrical to optical converter, proceed the signal transmission through transmission cable.
Good effect; Because the present invention has adopted two-way reception optical-electrical converter to be connected the modulation and demodulation that carries out signal with computer with the emission electrical to optical converter; Therefore, can realize that broadband rf signal directly changes the signal of telecommunication into, transmit in optical cable by the emission electrical to optical converter again.Device therefor is simple in structure, and broadband rf signal is undistorted, and the fireballing characteristics of conversion of signals.Suit in wide band radio-frequency light signal modulation and demodulation, to use.
Description of drawings
Fig. 1 is an optical modem structural representation of the present invention
Among the figure, 1. signal receives optical-electrical converter, and 1.1. receives optical cable, 2. launches electrical to optical converter, 2.1. transmission cable, 3. signal processor.
Embodiment
According to shown in Figure 1; The reception optical cable 1.1 of optical modem one side is connected with signal reception optical-electrical converter 1 and transfers signals in the signal processor 3 through holding wire; Signal processor is connected with emission electrical to optical converter 2 through holding wire, on the emission optical-electrical converter, is connected with transmission cable 2.1.
The course of work
The wide band radio-frequency light signal is transferred in the reception optical-electrical converter through receiving optical cable; Convert light signal into the signal of telecommunication through receiving optical-electrical converter; With the signal of telecommunication after the conversion through the signal processor of transmission line in the computer; Program software through signal processor; The signal of telecommunication that will come from light signal is understood through terminal equipment; To need the loaded data signal to arrive the emission electrical to optical converter through computer simultaneously through transmission line; Change the signal of telecommunication into light signal through the emission electrical to optical converter, proceed the signal transmission through transmission cable.
Characteristics
Device therefor is simple, and intensification is strong, and the signal transmission is undistorted, and loading data and signal intercommunication in network easily, is convenient to realize the signal light transmission cableization, synchronizes them transmitting optical signal, the signal of telecommunication and radio signal.
Claims (1)
1. wide band radio-frequency light modulation demodulation method is characterized in that:
The reception optical cable (1.1) of optical modem one side is connected with signal reception optical-electrical converter (1) and transfers signals in the signal processor (3) through holding wire; Signal processor is connected with emission electrical to optical converter (2) through holding wire, on the emission optical-electrical converter, is connected with transmission cable (2.1);
Utilize optical modem; The wide band radio-frequency optical signal is transferred in the reception optical-electrical converter by receiving optical cable; By receiving optical-electrical converter optical signal is converted to the signal of telecommunication; With the signal of telecommunication after the conversion by the signal processor of transmission line in the computer; Program software through signal processor; The signal of telecommunication that will come from optical signal is understood by terminal device; To need the loaded data signal to arrive the emission electrical to optical converter by computer simultaneously through transmission line; Change the signal of telecommunication into optical signal by the emission electrical to optical converter, proceed the signal transmission through transmission cable.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101800142A CN102355307A (en) | 2011-06-30 | 2011-06-30 | Broadband radio frequency light modulation and demodulation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101800142A CN102355307A (en) | 2011-06-30 | 2011-06-30 | Broadband radio frequency light modulation and demodulation method |
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| CN102355307A true CN102355307A (en) | 2012-02-15 |
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| CN2011101800142A Pending CN102355307A (en) | 2011-06-30 | 2011-06-30 | Broadband radio frequency light modulation and demodulation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110611514A (en) * | 2019-09-20 | 2019-12-24 | 盛纬伦(深圳)通信技术有限公司 | Signal demodulation system, method and computer storage medium for distributed receiver |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997021288A1 (en) * | 1995-12-06 | 1997-06-12 | Ericsson Raynet, A Delaware General Partnership | Full duplex optical modem for broadband access network |
| EP1354431B1 (en) * | 2000-08-07 | 2007-10-17 | Tellabs Bedford, Inc. | Rf bidirectional optical transmission |
| CN201663642U (en) * | 2009-10-30 | 2010-12-01 | 中铁八局集团电务工程有限公司 | Optical-fiber multi-service terminal for railway sections |
-
2011
- 2011-06-30 CN CN2011101800142A patent/CN102355307A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997021288A1 (en) * | 1995-12-06 | 1997-06-12 | Ericsson Raynet, A Delaware General Partnership | Full duplex optical modem for broadband access network |
| EP1354431B1 (en) * | 2000-08-07 | 2007-10-17 | Tellabs Bedford, Inc. | Rf bidirectional optical transmission |
| CN201663642U (en) * | 2009-10-30 | 2010-12-01 | 中铁八局集团电务工程有限公司 | Optical-fiber multi-service terminal for railway sections |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110611514A (en) * | 2019-09-20 | 2019-12-24 | 盛纬伦(深圳)通信技术有限公司 | Signal demodulation system, method and computer storage medium for distributed receiver |
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Application publication date: 20120215 |