CN105721060B - A kind of two-way multi service access ROF Transmission systems and method that carrier wave huge profit is realized using palarization multiplexing - Google Patents
A kind of two-way multi service access ROF Transmission systems and method that carrier wave huge profit is realized using palarization multiplexing Download PDFInfo
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- CN105721060B CN105721060B CN201610019676.4A CN201610019676A CN105721060B CN 105721060 B CN105721060 B CN 105721060B CN 201610019676 A CN201610019676 A CN 201610019676A CN 105721060 B CN105721060 B CN 105721060B
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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
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
- H04B10/5057—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output
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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
-
- 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
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/54—Intensity modulation
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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
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/615—Arrangements affecting the optical part of the receiver
- H04B10/6151—Arrangements affecting the optical part of the receiver comprising a polarization controller at the receiver's input stage
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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
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/691—Arrangements for optimizing the photodetector in the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0254—Optical medium access
- H04J14/0261—Optical medium access at the optical multiplex section layer
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/06—Polarisation multiplex systems
Abstract
The present invention provides a kind of two-way multi service access ROF Transmission systems and method that carrier wave huge profit is realized using palarization multiplexing.The system concentrates on the optical carrier suppression signal of positive and negative single order sideband in central station generation energy.Then in multi-service signal modulation to positive single order optical sideband and the polarization state of negative one rank sideband and former 45 degree of polarization state angle will be controlled, completes multi-service light and carry millimeter wave modulation.This optical signal is transferred to base station through fiber link and is divided into two parts through polarization separation, and a part is converted into multi-service electricity millimeter wave by photodetection and is sent after amplification by antenna, is received in subscriber unit by antenna and demodulates the signal of each business respectively；Another part carries radiofrequency signal as the light carrier of uplink signal and is sent to central station, and carrying out opto-electronic conversion in central station obtains radio frequency baseband signal.
Description
Technical field
The present invention relates to it is a kind of using palarization multiplexing realize carrier wave huge profit two-way multi service access ROF Transmission systems and
Method has the existing communication technology certain supplement.
Background technology
At present, the wireless technology (including LTE, WiFi, WiMax etc.) of low frequency due to their mobility, flexibility, be conducive to
The property of access is facilitated to obtain great concern.On the other hand, growing mobile multimedia service is passed with high data
Defeated rate, the transmission rate of plan can reach several Gbit/s, thus big bandwidth is needed to meet high-speed radio information access
Demand, the development of high frequency millimeter wave wireless access technology is undoubtedly greatly facilitated in this.In order to cater to bigger bandwidth and higher rate
Demand, signal is needed to be operated in higher frequency range, near 60GHz the opening transmission bandwidth of 7-9GHz undoubtedly become the next generation
The focus of wireless service.ROF has become enhancing nothing using advantages such as low-loss, big bandwidth and the low costs of optical fiber technology
The capacity and mobility of line access environment (such as conference centre, airport, small office) and the powerful measure for reducing its cost.
However, the atmospheric attenuation under this frequency causes each base station to have the coverage area of very little.Therefore, many full duplex base stations need
As soon as covering a specific overlay area, this needs base station cost relatively low and manages to lead to facilitate.In this case, people
It is highly desirable in ROF system light source concentrating on central office to avoid using lasing light emitter in each base station.Due to attached in 60GHz
Closely there is 7-9GHz ultra wide bandwidths, ROF system can realize the multiple services wireless signal transmission of multiband
In recent years, many methods were suggested the centralization for realizing lasing light emitter.Such as the light intensity modulated signal of downlink can
Information erasing is realized with the gain saturaition based on reflection type semiconductor image intensifer, on the approximate continuous light source of acquisition
Row signal modulation.However, such system effectiveness is usually needed than relatively low because wanting the information of effective removal downlink signal
Downlink signal has relatively low extinction ratio.The method that another kind realizes light source centralization in ROF system is to recycle downlink letter
Number a light carrier as uplink signal lasing light emitter.By the carrier wave of huge profit can be original continuous optical carrier or
It is an optical sideband.Then, by another electrooptic modulator, uplink signal can be modulated onto on light carrier.This method
It needs to increase optical filter in base station, increases the complexity and cost of base station.
In the multiple services transmission of multiband, many implementation methods are the differences of the light carrier and optical sideband in central station
Different wireless signals is carried on rank sideband, realizes different nothings by the combination of wave filter or light polarization modulator on base station
The separation of line signal and the huge profit of light carrier are used.But these methods equally increase the complexity and cost of base station.
To meet the transmitted in both directions of multiband multi-service wireless signal, and the complexity and cost for reducing base station are taken into account, needed
Introduce a kind of new multi-business bidirectional ROF system and method.
Invention content
In view of this, the purpose of the present invention is to provide a kind of two-way more industry that carrier wave huge profit is realized using palarization multiplexing
Business access ROF Transmission systems, the system can transmit the wireless signal of multiple business, meet now user to the need of different business
It asks, and huge profit carrier wave realizes that light source is removed in base station.
It is another object of the present invention to provide kind of an application palarization multiplexings to realize that the two-way multi-service of carrier wave huge profit connects
Enter ROF transmission method, this method apply with multiple business wireless signal be transmitted in realize base station remove light source.On reaching
Purpose is stated, what technical scheme of the present invention was specifically realized in：
A kind of two-way multi service access ROF Transmission systems that carrier wave huge profit is realized using palarization multiplexing, the system include：
Central station, base station, three modules of subscriber unit, principle are as shown in Figure 1.
There are two the major functions of the central station module, first, generating 60GHz wave band multi-service downlink millimeter waves
Signal, second is that receiving the uplink signal from base station.In the downlink, it is produced first by a distributed feedback laser
The continuous light carrier that frequency is 193.1GHz is given birth to, then this light carrier enters both arms Mach increasing Dare modulator 1, realizes light carrier
Inhibit (OCS) modulation.Rf frequency is 14GHz, is driven rf frequency frequency multiplication for 28GHz by the frequency multiplier of a 1*2
Both arms Mach increases Dare modulator 1.The light carrier that laser generates energy after OCS is modulated concentrates on positive and negative single order sideband
On, the frequency interval between two sidebands is 56GHz.OCS modulated signals are after light Interleaver (Interleaver)
It is divided into two-way, the positive and negative single order sideband of OCS modulated signals is detached, upper rood to positive single order sideband, lower rood to negative one rank side
Band.The optical signal on upper road enters the external modulation that both arms MZ Mach-Zehnder 2 realizes frequency microwave signal.This radiofrequency signal is
The polymerization of multi-service signal (2G, 3G, 4G, WiMax) is realized by arbitrary waveform generator (AWG).Lower road signal enters polarization
Controller, the optical signal and the optical signal polarization direction angle of input of output are 45 degree.Both arms mach zhender is passed through on upper road
The external modulation optical signal obtained after modulator 2 passes through polarization beam combiner with lower road by the optical signal that offset controller obtains
(PBC) combining obtains the palarization multiplexing light load millimeter-wave signal of 60GHz wave bands, this signal is transmitted to base station by fiber link.
In the uplink, central station receive come and base station optical signal, base electrical signal is obtained by a Low speed photo detector
Then primary data information (pdi) is restored.
The base station module includes five parts：Polarization beam apparatus, high-speed photodetector, electric amplifier, antenna and horse
Conspicuous Zeng Deer intensity modulators.Base station is received obtained optical signal after the optical signal of fiber link first by polarization point
Beam device detaches the optical signal of two kinds of polarization states.Wherein upper road signal, which is included in central station, passes through MZ Mach-Zehnder 1
Obtained negative one rank sideband half energy and the external modulation signal energy obtained by MZ Mach-Zehnder 2；Lower rood
To the other half energy of negative one rank sideband obtained by MZ Mach-Zehnder 1.The upper road optical signal warp that PBC is separated
Become electric millimeter wave after crossing high-speed photodetector, after amplifying using electric amplifier, be sent in air by antenna；It isolates
Lai Xia roads optical signal enters MZ Mach-Zehnder 3 as light carrier and obtains uplink light modulating signal, is sent to central station.
Base station receives the wireless signal from line module, and drive signal of this signal as MZ Mach-Zehnder 3 obtains uplink
Light modulating signal.
Line module includes bandpass filter, electric amplifier, power splitter, frequency mixer, low-pass filtering and Error Detector.It is logical
An identical antenna in a base station is crossed to receive electric millimeter-wave signal, then by bandpass filter filter out useless frequency into
Point, it electric signal power is subsequently amplified by electric amplifier and passes through power splitter is equally divided into four tunnels, then different be mixed by four
Device receives and demodulated base band signal, then by low-pass filter, respectively obtains 2G, 3G, 4G and WiMax signal.
In above system, the central station module includes：
Laser as the carrier wave light source in fiber link, can carry the data-signal of large capacity.It is used in this patent
The frequency that distributed feedback laser generates is the continuous light carrier of 193.1GHz.
Modulator, both arms MZ Mach-Zehnder 1 realize OCS modulated signals, and both arms MZ Mach-Zehnder 2 is realized
The external modulation of radiofrequency signal, two modulators are implemented in combination with light in millimeter wave, completion electrical/optical conversion.
Signal generator, for generating sinusoidal signal, the electric drive signal as both arms MZ Mach-Zehnder 1.
Electric phase-shifter, for changing the phase of electric signal, the two-arm up and down of both arms MZ Mach-Zehnder apply amplitude,
Frequency is identical, and one of the condition of optical carrier suppression is realized when phase difference is 180 electric signal.
Light Interleaver, for incident optical signal is carried out frequency separation so that the light of different frequency range enters not
Same branch.
Arbitrary waveform generator, for generating the composite signal of 2G, 3G, 4G and WiMax signal.
Polarization Controller controls the polarization angle of light, can realize that polarization is multiple with polarization splitter with reference to polarization combiner
With.
Polarization beam combiner by the optical signal synthesis of different polarization states all the way, realizes palarization multiplexing.
In above system, the base station module includes：
The optical signal received is divided into the orthogonal optical signal of two-way polarization state by polarization beam apparatus, is only existed per road optical signal
There is energy in one polarization direction.
The light received is carried millimeter-wave signal and is converted to electric millimeter wave letter by quadratic detection mode by photodetector
Number
Electric amplifier is amplified 60GHz transmission bands, and the electric millimeter wave for increasing transmission washes power.
Electric millimeter-wave signal is sent in air by transmission antenna
Mach zhender intensity modulator realizes the up-conversion of base station radio-frequency signal, radiofrequency signal is mounted in optical signal
Upper realization uplink.
In above-mentioned system, subscriber unit includes：
Reception antenna using electromagnetic induction technology, receives the electric millimeter-wave signal from base station.Then by electric signal output
To bandpass filter
Bandpass filter filters out the interference except 60GHz frequency bands and noise signal, then output valve amplifier.
Amplifier to being amplified by the electric millimeter-wave signal of wireless channel, is then exported to frequency mixer.
Electric signal is equally divided into four tunnels by power splitter, is exported for the demodulation of multi-service signal.
Frequency mixer using multiple by corresponding to the frequency mixer of 2G, 3G, 4G and WiMax millimeter-wave signal frequency, will amplify
Device output electric signal handled in multiple frequency mixers respectively, then by low-pass filter demodulate 2G, 3G, 4G and
The baseband signal of WiMax.
Low-pass filter, for filtering out the outer high-frequency signal of band and noise of the baseband signal of frequency mixer output.Then will
Baseband signal is sent into Error Detector.
Error Detector, for observing the error code degree of transmission signal.
In order to achieve the above objectives, technical scheme of the present invention is specifically realized in：
Central station module obtains frequency in lasing light emitter after first has the horse of radio-frequency driven that frequency is f to increase modulator
Difference is the positive and negative single order optical sideband of 2f.Then positive single order sideband, which enters after the horse driven by multi-service signal increases modulator, obtains light
In radiofrequency signal；Negative one rank sideband is controlled by Polarization Controller changes polarization state.Then two paths of signals and rood are multiple to polarization
Light carries mm wave RF signal.This optical signal is sent to base station by 10km standard single-mode fibers, will by polarization separator
Two polarization states separation of optical signal.Enter after photodetector as light load mm wave RF signal all the way and obtain millimeter wave letter
It number is sent after electric amplifier amplifies by antenna；Another way is carried electric signal as the light carrier of uplink signal and is carried out
Row transmission.Subscriber unit reception antenna receives electric millimeter-wave signal, after bandpass filter and electric amplifier with different frequencies
Then the local oscillation signal mixing of rate then isolates different service signals by low-pass filter.
Description of the drawings
Fig. 1 is the two-way multi service access ROF Transmission systems knot principle that carrier wave huge profit is realized using palarization multiplexing
Fig. 2 is the two-way multi service access ROF Transmission system structure diagrams that carrier wave huge profit is realized using palarization multiplexing
Specific embodiment
For the purposes of the present invention, technical solution and advantage are more clearly understood that clear, according to refer to the attached drawing, to the present invention into one
Step is described in detail.
Fig. 2 is the two-way multi service access ROF Transmission system knots for realizing carrier wave huge profit in the present invention using palarization multiplexing
Structure schematic diagram.In conjunction with Fig. 2, the two-way multi service access ROF that palarization multiplexing is applied to realize carrier wave huge profit in the present invention is passed
Defeated system structure illustrates, specific as follows：
The two-way multi service access ROF Transmission systems for realizing carrier wave huge profit using palarization multiplexing in the present invention include：In
Center station module 20, base station 21, subscriber unit 22.
Central station module 20 generates continuous light as carrier wave by laser 2001, and light carrier increases modulator by both arms horse
2002 obtain optical carrier suppression (OCS) optical signal, and light wave main energetic is several in positive and negative single order sideband.Drive modulator 2002
It is f that radiofrequency signal, which is frequency, and the difference on the frequency between the positive and negative single order sideband of light wave is 2*f.By light Interleaver 2005
Light wave is divided into two-way afterwards, and the positive single order sideband of light enters upper road, and light negative one rank sideband enters lower road.Upper Lu Zhongguang is increased by both arms horse
Modulator 2006 generates light and carries radiofrequency signal, and driving modulator 2006 is the multiple services polymerization letter of 2G, 3G, 4G and WiMax
Number.Lower road retrodeviates polarization state by Polarization Controller 2008 and rotates 45 degree.Then two-way passes through polarization beam combiner 2009 and road up and down
It obtains palarization multiplexing multi-service light and carries millimeter-wave signal.
Laser 2001 is distributed feedback laser, and output connection both arms horse increases modulator 2002, generates frequency here
For 193.1THz, line width is the continuous light wave of 10MHz as carrier wave.
Signal generator 2003 generates the radiofrequency signal of 14GHz, then obtains frequency by the frequency multiplier 2004 of a 1*2
To be divided into two-way after the radiofrequency signal of 28GHz, both arms horse is driven to increase 2002 upper arm of modulator all the way, another way passes through phase-shifter
2005 change driving both arms horse increasing 2002 underarm of modulator after 180 degree phase.
Both arms horse increases 2002 light input end of modulator and is connected to receive optical signal with laser, and output terminal connection light intersects wave
Division multiplexer 2006, radio-frequency driven upper arm connection frequency multiplier 2004, underarm connection phase-shifter 2005.Its bandwidth be 40GHz, delustring
Than for 30dB, half-wave voltage 5V.It briefly explains both arms horse and increases the modulator approach that modulator realizes optical carrier suppression, specially：
Optical signal is equally divided into two equal optical signals after both arms horse increasing modulator reception optical signal and respectively enters the upper of modulator
Lower two branches, since the substrate of modulator is using this arc materials of NibO3, refractive index is with the change of applied electronic signal
Change and change, then lead to the phase change of optical signal.When the drive signal of the two-arm up and down of the modulator letter opposite for symbol
Number, and up and down two-arm bias voltage difference be half-wave voltage when, can realize optical carrier suppression modulate.
Connection both arms horse increases modulator to 2006 one end of light Interleaver, and the other end is divided into two-way, connects horse respectively
Increase modulator 2007 and Polarization Controller 2009.The effect of light Interleaver is to detach optical signal, the positive single order side of light
Band enters upper road, and light negative one rank sideband enters lower road.
Arbitrary waveform generator 2008 generates the signal of multi-service signal 2G, 3G, 4G, WiMax polymerization, this signal is divided into two
Road, drives both arms horse to increase the upper arm of modulator all the way, and another way drives both arms horse after phase shifter 2010 changes 180 degree phase
Increase the underarm of modulator.
Both arms horse increases 2007 light input end of modulator and is connected to receive optical signal with light Interleaver 2006, exports
End connection polarization beam combiner 2011, radio-frequency driven upper arm connection arbitrary waveform generator 2008, underarm connection phase-shifter 2010.Its
Bandwidth is 20GHz, extinction ratio 30dB, half-wave voltage 5V.
2009 one end of Polarization Controller connection light Interleaver 2006 receives optical signal, one end connection polarization coupling
2011 output polarization state of device rotates the optical signal after 45 degree.
2011 receiving terminal of polarization beam combiner receives the optical signal of two-way up and down, and the light of upper and lower two-way different polarization states is believed
Number signal all the way is combined into, sends palarization multiplexing light load radio frequency millimeter-wave signal in other end connection optical fiber.
Photodetector 2012 is used as low frequency photodetector, receives uplink optical signal, base band is obtained by opto-electronic conversion
Signal.
Optical signal is divided into the optical signal of two-way different polarization states by polarization beam apparatus 2101 by base station module 21.It is light all the way
Millimeter-wave signal is carried, is 10GHz by three dB bandwidth after photodetector 2102 realizes opto-electronic conversion, centre frequency is
The electric amplifier 2103 of 60GHz is passed through after amplifying and is sent in air by antenna.Another way is carried as optical carrier by user
The radiofrequency signal formation uplink optical signal that unit is sent to base station is transferred to central station.
Incident palarization multiplexing optical signal is carried out polarization separation by polarization beam apparatus 2101, is divided into P light and S light.P light and S
Light only has single polarization state respectively.
Photodetector 2102 uses the avalanche diode of bandwidth 100GHz, and one end is connected with optical fiber, the other end and electricity
Amplifier is connected.Flashlight enters after photodetector is converted to electric millimeter wave according to photoelectric effect light load millimeter wave.
Mach increases 2104 light input end of Dare intensity modulator and is connected with polarization splitter, and is believed by the radio frequency that base station receives
Numbers 2105 as drive signals carry out light intensity modulations, and output terminal is connected with optical fiber, and modulated optical signal is carried out uplink.
2103 design parameter of electric amplifier：Three dB bandwidth is 10GHz, centre frequency 60GHz.Realize the work(to electric signal
Rate amplifies
Antenna 2106 sends the electric millimeter wave after power amplification in air.
The 60GHz signals that subscriber unit module 22 can be received by reception antenna 2201.Then pass through high-pass filtering
Device 2202 filters out the outer high-frequency signal of band and noise of the band signal of antenna reception.The amplification of electric amplifier 2203 is then passed through to decline
Four tunnels are equally divided by power splitter after the signal subtracted, then be mixed then low-pass filtering respectively at different local oscillation signals and comes
Obtain 2G, 3G, 4G and WiMax signal.Carry out the error condition of observation signal finally by Error Detector 2207.
2202 both ends of bandpass filter are divided into connection reception antenna 2201 and electric amplifier 2203, and effect is for filtering out
The outer high-frequency signal of band and noise for the band signal that antenna receives reduce out-of-band interference.
2203 both ends of electric amplifier connect bandpass filter and power splitter 2204 respectively.For optical fiber and wireless communication will to be passed through
The electric signal power amplification of road attenuation.
Power splitter 2204, both ends connect electric amplifier 2202 and frequency mixer 2205 respectively.Electric signal is equally divided into multichannel
Identical electric signal enters multiple frequency mixers and is mixed from different local oscillation signals.
2205 one end of frequency mixer connects power splitter 2204, one end connection low-pass filter 2206.From different local oscillation signals
Low-pass filtering obtains 2G, 3G, 4G and WiMax signal after being mixed.
Error Detector 2207 connects low-pass filter 2206.Variation degree after being transmitted across in systems for observation signal with
And error condition.
Claims (4)
1. a kind of two-way multi service access ROF Transmission systems that carrier wave huge profit is realized using palarization multiplexing, which is characterized in that should
System includes：Central station, 3 modules in base station and subscriber unit:
There are two the major functions of the central station module, first, 60GHz frequency range multi-service downlink millimeter-wave signals are generated,
Second is that receiving the uplink signal from base station, in the downlink, frequency is generated by a distributed feedback laser first
Rate is the continuous light carrier of 193.1THz, and then the light carrier enters the light input port that both arms Mach increases Dare modulator 1；Letter
Number generator generates the radio-frequency signal source that frequency is 14GHz, is driven radiofrequency signal frequency multiplication for 28GHz by 2 frequency multipliers
Dynamic both arms Mach increases Dare modulator 1, realizes that optical carrier suppression (OCS) obtains 56GHz optical millimeter wave signals；Modulator 1 exports
56GHz light carry millimeter-wave signal be separated into two positive and negative single order sidebands by light Interleaver (Interleaver),
Positive single order sideband by both arms MZ Mach-Zehnder 2, the multi-service signal 2G generated by arbitrary waveform generator (AWG),
3G, 4G, WiMax driving MZ Mach-Zehnder 2 realize the output of multi-service optical signal；Negative one rank sideband passes through Polarization Controller
Rotatory polarization state, polarization direction in angle of 45 degrees, are then synthesized two ways of optical signals partially by polarization beam combiner with former polarization direction
The multi-service light of multiplexing of shaking carries millimeter-wave signal, this signal is transmitted to base station, in the uplink, central station by fiber link
The optical signal from base station is received, base electrical signal is obtained by a photodetector and then restores primary data information (pdi)；
The multi-service light that the base station module receives palarization multiplexing carries millimeter-wave signal, this signal polarization is detached, X polarization directions
Millimeter-wave signal and a light carrier are carried for multi-service light, electric millimeter-wave signal is obtained by photodetector beat frequency, passes through day
Line is sent；Y polarization directions optical signal carries uplink electrical signals, completes uplink signal modulation as uplink light carrier；
Subscriber unit module receives the electric millimeter-wave signal from base station, is received and conciliate with frequency mixer after filtered amplification branch
The baseband signal of different business is tuned into, by ophthalmograp come the variation degree of observation signal.
2. system according to claim 1, which is characterized in that the base station module includes：
Incident optical signal, is separated into the two ways of optical signals of cross-polarization by polarization beam apparatus, and X polarization directions optical signal is more industry
Business light carries millimeter-wave signal and enters in photodetector, and Y polarization directions optical signal entered Mach once as uplink signal light carrier
Dare modulator 3；
Light load millimeter-wave signal is converted to electric millimeter-wave signal by photodetector according to photoelectric effect；
The centre frequency of electric amplifier is 60GHz, bandwidth 10GHz, and power amplification is realized to electric millimeter wave；
The amplified electric millimeter-wave signal of electric amplifier is sent in air by transmitting antenna；
Modulator using mach zhender intensity modulator, the electric signal that base station receives is mounted on optical signal and is carried out
Row transmission.
3. system according to claim 1, which is characterized in that electric millimeter wave letter of the subscriber unit received from base station
Number, the baseband signal of different business is demodulated, which mainly includes：
Reception antenna using electromagnetic induction technology, receives the electric millimeter-wave signal that base station is sent, is then transferred to signal processing device
It puts；
Bandpass filter for filtering out the band signal and noise outside 60GHz band bandwidths, is then exported to electric amplifier；
Electric amplifier amplifies the electric signal power of attenuation；
The amplified electric millimeter-wave signal of electric amplifier is equally divided into four tunnels by power splitter, be respectively used to demodulate later 2G,
3G, 4G and WiMax signal；
Four tunnels of power splitter are exported and are mixed respectively at different local oscillation signals by frequency mixer, demodulate 2G, 3G, 4G and
WiMax signals；
The output of frequency mixer is filtered out the outer high-frequency signal of the band of baseband signal and is made an uproar by low-pass filter by low-pass filter
Sound；
Ophthalmograp, for observing after system is transmitted, the pattern variation of signal and error code degree.
4. a kind of two-way multi service access ROF transmission method that carrier wave huge profit is realized using palarization multiplexing, which is characterized in that should
Method includes：
A. multi-service light carries millimeter wave modulation method, and laser sends out the continuous light wave that centre frequency is 193.1THz and enters both arms horse
Conspicuous increasing Dare modulator 1 obtains the optical signal that energy concentrates on positive and negative single order sideband, driving using optical carrier suppression modulation system
Signal combines the sinusoidal signal of the 28GHz generated, thus the frequency between positive and negative single order sideband for signal generator with frequency multiplier
Difference is 56GHz；Positive and negative single order sideband is detached using light Interleaver, positive single order sideband enters Mach and increases Dare modulation
In device 2, multi-service light load millimeter wave is obtained with being combined after the completion modulation of multi-service signal with negative one rank sideband；
B. huge profit Carrier wave, in central station module, by control Polarization Controller control light negative one rank sideband polarization state with it is former
Polarization state polarization direction in angle of 45 degrees, therefore can resolve into two in the former polarization state polarization state orthogonal with former polarization state
Polarized component；Two polarization states of optical signal are detached by polarization beam apparatus in base station module, are believed in orthogonal polarisation state glazing
Number only there is the energy of negative one rank sideband without other frequency components, this part optical signals is made to enter Mach and increases Dare modulation
Device 3 is used as light carrier, and the radiofrequency signal that base station receives completes the light modulation of uplink signal as driving.
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| CN108759879B (en) * | 2018-04-26 | 2019-11-26 | 浙江大学 | A kind of wavelength resolver based on grating sensor |
| CN111416662B (en) * | 2020-03-31 | 2021-06-25 | 西安邮电大学 | Signal generation and transmission method based on polarization multiplexing double MZM modulator |
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| CN101715249A (en) * | 2009-12-07 | 2010-05-26 | 湖南工业大学 | Optical-fiber wireless system for full-duplex communication |
| CN102006137A (en) * | 2010-10-18 | 2011-04-06 | 电子科技大学 | Method and system for generating multi-frequency millimeter wave and applying same to multi-base station ROF communication system |
| CN102629887A (en) * | 2012-05-09 | 2012-08-08 | 电子科技大学 | Full-duplex radio-over-fiber (RoF) access device |
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