CN109525318A - A kind of full duplex light carrier radio communication system - Google Patents
A kind of full duplex light carrier radio communication system Download PDFInfo
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- CN109525318A CN109525318A CN201811196993.9A CN201811196993A CN109525318A CN 109525318 A CN109525318 A CN 109525318A CN 201811196993 A CN201811196993 A CN 201811196993A CN 109525318 A CN109525318 A CN 109525318A
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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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
- H04B10/25752—Optical arrangements for wireless networks
- H04B10/25758—Optical arrangements for wireless networks between a central unit and a single remote unit by means of an optical fibre
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- 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
- H04B10/2581—Multimode transmission
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/506—Multiwavelength transmitters
-
- 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
Abstract
The present invention relates to a kind of full duplex light carrier radio communication systems, including the first link and the second link, light carrier radio communication of first link for the W-waveband between from first end to second end, and first link includes the first emitter and first receiving device, the central wavelength that first emitter passes through setting light source, W-waveband millimeter wave is generated with beat frequency, and the first original signal is modulated on W-waveband millimeter wave, to obtain the first modulated signal, and first modulated signal is sent to first receiving device；The first receiving device is for receiving and demodulating first modulated signal, to obtain first original signal.The light carrier radio communication of W-waveband between second link is used for from second end to first end, and second link is consistent with the network topology structure of first link.This programme generates W-waveband millimeter using beat frequency, and network configuration operations are simple, and cost substantially reduces and realize higher access bandwidth.
Description
Technical field
The present invention relates to optical fiber radio communication technical fields, more particularly, to a kind of duplexing light carrier radio communication system.
Background technique
Wireless penetration and it is broadband be current communication industry or even entire information industry hot spot.Current wireless communication system master
The low-frequency range microwave signal that use frequency spectrum congestion is difficult to break through the bottleneck of bandwidth and transmission rate, along with broadband services
It rapidly develops, inevitable requirement uses the higher wireless channel of working frequency.
With communications industry fast development, 5G is more and more closer from formal commercialization.Existing communication network is for transmission speed
The requirement of rate also increasingly increases.This just for can bearing multiple service, meet the next-generation large capacity access technologies of more scenes
Development put forward higher requirements.People are badly in need of can be realized the communication network of high speed and super wideband wireless service access.
Summary of the invention
Based on this, it is necessary to for the communication networking problems for how realizing high bandwidth access, provide a kind of full duplex light load
Wireless communication system.
A kind of full duplex light carrier radio communication system, including the first link and the second link, first link, for from
For first end to the light carrier radio communication of the W-waveband between second end, first link includes that the first emitter and first receive
Device, wherein first emitter generates W-waveband millimeter wave for the central wavelength by setting light source with beat frequency,
And the first original signal is modulated on W-waveband millimeter wave, to obtain the first modulated signal, and first modulated signal is sent out
It send to first receiving device；The first receiving device, first modulation sent for receiving first emitter
Signal demodulates first modulated signal, to obtain first original signal；Second link, for from second end to
The light carrier radio communication of W-waveband between first end, and second link is consistent with the network topology structure of first link.
First emitter includes: the first modulation module in one of the embodiments, for generating W-waveband milli
Metric wave, and first original signal is modulated on W-waveband millimeter wave, to obtain the first modulated optical signal, and first is adjusted
Optical signal processed is input to the first optical fiber transmission module；First optical fiber transmission module, for receiving the first modulation light letter
Number, and first modulated optical signal is transmitted through the fiber to the first transmitting module；First transmitting module, for receiving
First modulated optical signal of the first optical fiber transmission module transmission, and believed first modulation light by photodetection
Number it is converted into the first modulation signal, to obtain the first modulated signal, and will the first modulation letter using the first transmitting antenna
Number it is sent to first receiving device.
First modulation module includes: first light source unit, second light source unit, in one of the embodiments,
One modulation unit, first phase control unit and the first optical coupling unit, first light source unit series connection first modulation
Unit forms the first branch, and the second light source unit first phase control unit of connecting forms second branch, and described the
It connects after one branch and the second branch are in parallel first optical coupling unit；First modulation module, by the way that institute is arranged
State the central wavelength difference of first light source unit and the second light source unit, the corresponding beat frequency generated is W-waveband, and by original letter
Number original signal is modulated to the first light source unit by first modulation unit generates in first laser, and described first
Phase control unit controls the phase for the second laser that the second light source unit generates, and the first laser and described second swash
Two beam laser are combined by the first optical coupling unit by light, to generate first modulated optical signal of W-waveband frequency, and by the
One modulated optical signal is input to the first optical fiber transmission module.
It is single-mode optics that first optical fiber transmission module, which includes: the first optical fiber transmission unit, in one of the embodiments,
Fibre is used for transmission first modulated optical signal to the first fiber amplifier unit；The first fiber amplifier unit is used for optical fiber
First modulated optical signal is amplified in communication line, and first modulated optical signal is transmitted to first hair
Penetrate module.
First transmitting module includes: the first photoelectric conversion unit in one of the embodiments, described for receiving
First modulated optical signal, and first modulation signal is converted by first modulated optical signal, and described first is adjusted
Electric signal transmission processed is to the first power amplification unit；First power amplification unit, for receiving the first modulation telecommunications
Number, and the power for amplifying first modulation signal obtains the first modulated signal, and first modulated signal is sent to
First transmitting unit；First transmission antenna unit, for emitting first modulated signal to intended recipient end.
The first receiving device includes: the first receiving module in one of the embodiments, for receiving described first
Modulated signal, to obtain the second modulation signal, and it is in first that second modulation signal, which is reduced frequency by mixing,
Frequency electric signal, and be the second modulated optical signal by the first medium frequency electric signal modulation, second modulated optical signal is inputted
To the second optical fiber transmission module；Second optical fiber transmission module, for receiving second modulated optical signal, and by described
Two modulated optical signals are transmitted through the fiber to the first demodulation module；First demodulation module, for receiving second optical fiber
Second modulated optical signal of transmission module transmission, and second modulated optical signal is demodulated, it is original to obtain described first
Signal.
First receiving module in one of the embodiments, comprising: the first receiving antenna unit, for receiving target hair
First modulated signal that sending end is sent, and first modulated signal is transmitted to the first low noise power amplifier unit；Described
One low noise power amplifier unit carries out low noise power amplification for receiving first modulated signal, and by first modulated signal
For the second modulation signal, and second modulation signal is transmitted to the first mixed modulated unit；First mixing is adjusted
Unit processed receives second modulation signal, and reducing frequency by mixing is the first intermediate frequency electric signal, and will be in described first
Frequency electric signal is modulated to the second modulated optical signal, and second modulated optical signal is input to the second optical fiber transmission module.
The second optical fiber transmission module includes: the second optical fiber transmission unit in one of the embodiments, is used for transmission described
Second modulated optical signal to the second fiber amplifier unit；The second fiber amplifier unit is used in optical fiber telecommunications line to institute
It states the second modulated optical signal to amplify, and second modulated optical signal is transmitted to first demodulation module.
First demodulation module includes: the first filter unit in one of the embodiments, for receiving described second
Modulated optical signal, and noise signal is filtered out, to obtain the first filtering signal, and first filtering signal is transmitted to the first solution
Adjust unit；First demodulating unit is used to receive first filtering signal of the first filter unit transmission, demodulates institute
The first filtering signal is stated, to obtain first original signal.
First link includes the first dual-mode antenna in one of the embodiments, and second link includes second
Dual-mode antenna；First dual-mode antenna include the first transmitting antenna and the first receiving antenna, and first transmitting antenna and
First receiving polarization mode is unanimously horizontal plan or vertical polarization；Second dual-mode antenna includes the second transmitting day
Line and the second receiving antenna, and second transmitting antenna and the second receiving polarization mode are unanimously horizontal plan or hang down
Straight polarization；Wherein, if the polarization mode of first dual-mode antenna is horizontal polarization, the polarization side of second dual-mode antenna
Formula is vertical polarization；If the polarization mode of first dual-mode antenna is vertical polarization, the polarization of second dual-mode antenna
Mode is horizontal polarization.
Above-mentioned full duplex light carrier radio communication system, including the first link and the second link, first link, for from
For first end to the light carrier radio communication of the W-waveband between second end, the first link of the full duplex light carrier radio communication system is logical
It crosses first emitter and W-waveband millimeter wave is generated with beat frequency by the central wavelength of setting light source, and by the first original letter
It number is modulated on W-waveband millimeter wave, to obtain the first modulated signal, then first modulated signal is sent to the first reception dress
It sets；The first receiving device demodulates first modulated signal by receiving first modulated signal, described in obtaining
First original signal；Second link is consistent with the network topology structure of first link, realizes from second end to first
The light carrier radio communication of W-waveband between end.In the full duplex light carrier radio communication system, in first emitter
The original signal is modulated to the complicated signal processings such as W-waveband, phase controlling and electric light conversion, is generated using beat frequency
W-waveband millimeter, network configuration operations are simple, and cost substantially reduces, and generating W-waveband millimeter wave using beat frequency can as carrier frequency
Realize higher access bandwidth.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the full duplex light carrier radio communication system 1 of one embodiment of the invention；
Fig. 2 is the structural schematic diagram of the first emitter 111 of first link 11 of one embodiment of the invention；
Fig. 3 is the structural schematic diagram of the first receiving device 112 of first link 11 of one embodiment of the invention；
Fig. 4 is the structural schematic diagram of the second emitter 121 of second link 12 of one embodiment of the invention；
Fig. 5 is the structural schematic diagram of the second reception device 122 of second link 12 of one embodiment of the invention；
Fig. 6 a is the component structure schematic diagram of the first emitter 111 of first link 11 of one embodiment of the invention；
Fig. 6 b is the component structure schematic diagram of the first receiving device 112 of first link 11 of one embodiment of the invention；
Fig. 7 a is the component structure schematic diagram of the second emitter 121 of second link 12 of one embodiment of the invention；
Fig. 7 b is the component structure schematic diagram of the second reception device 121 of second link 12 of one embodiment of the invention.
Specific embodiment
To facilitate the understanding of the present invention, in order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, under
In conjunction with attached drawing, specific embodiments of the present invention will be described in detail in face.It is explained in the following description many details
To facilitate a thorough understanding of the present invention, giving better embodiment of the invention in attached drawing.But the present invention can be with many not
With form realize, however it is not limited to embodiments described herein.On the contrary, the purpose of providing these embodiments is that making
It makes the present disclosure more fully understandable.The present invention can be to be much different from other way described herein
Implement, those skilled in the art can make similar improvements without departing from the spirit of the invention, therefore the present invention not by
The limitation of following public specific embodiment.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.In the description of the present invention, " several " are meant that at least one, such as one,
Two etc., unless otherwise specifically defined.
It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side " and similar statement for illustrative purposes only, are not meant to be the only embodiment.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical.Term used herein is intended merely to the mesh of description specific embodiment
, it is not intended that in the limitation present invention.Term " and or " used herein includes one or more relevant listed items
Any and all combinations.
The embodiment of the present invention provides a kind of full duplex light carrier radio communication system, as shown in Figure 1, full duplex light-carried wireless is logical
Letter system 1 may include the first link 11 and the second link 12, wherein between the first link 11 is used for from first end to second end
The light carrier radio communication of W-waveband, light carrier radio communication of second link 12 for the W-waveband between from second end to first end.The
One link 11 may include the first emitter 111 and first receiving device 112, and the first emitter 111 is for passing through setting
The central wavelength of light source generates W-waveband millimeter wave using beat frequency, and the first original signal is modulated on W-waveband millimeter wave, with
The first modulated signal is obtained, and the first modulated signal is sent to first receiving device 112, wherein the frequency of W-waveband millimeter wave
Range is 75-110GHz.First receiving device 112 is used to receive the first modulated signal of the first emitter 111 transmission, demodulation
First modulated signal, to obtain the first original signal.Light of second link 12 for the W-waveband between from second end to first end carries
Wireless communication, and the second link 12 is consistent with the network topology structure of the first link 11.First link 11 and the second link 12 carry
Frequency is W band frequency, and the center frequency of the first link 11 and the second link 12 is not completely the same, the range of center frequency difference
2-3GHz.For example, if the centre frequency of the first link 11 is set as 98GHz, the centre frequency of the second link 12 is set as
100GHz.Certainly, the revenue centre frequency of the first link 11 is not limited to above-mentioned 98GHz, can also be set as other frequencies of W frequency range
Rate, then the centre frequency of the second link 12 accordingly changes, and details are not described herein again.
In one of the embodiments, as shown in Fig. 2 and Fig. 6 a, the first emitter 111 may include: the first modulation mould
Block 1111, the first optical fiber transmission module 1112 and the first transmitting module 1113, wherein the first modulation module 1111 is for generating W
Wave band millimeter wave, and the first original signal is modulated on W-waveband millimeter wave, to obtain the first modulated optical signal, and by first
Modulated optical signal is input to the first optical fiber transmission module 1112；First optical fiber transmission module 1112 is for receiving the first modulation light letter
Number, and the first modulated optical signal is transmitted through the fiber to the first transmitting module 1113；First transmitting module 1113 is for receiving
First modulated optical signal of the first optical fiber transmission module 1112 transmission, and converted the first modulated optical signal to by photodetection
First modulated signal to obtain the first modulated signal, and is sent to first using the first transmitting antenna by the first modulation signal
Reception device 112.
In one of the embodiments, as shown in Fig. 2 and Fig. 6 a, the first modulation module 1111 may include: first light source
Unit 11111, second light source unit 11112, the first modulation unit 11113, the first modulation unit 11114 and the first optical coupling list
Member 11115, wherein the first modulation unit 11113 of series connection of first light source unit 11111 forms the first branch, second light source unit
11112 the first modulation units 11114 of series connection form second branch, the first optocoupler of connecting again after the first branch and second branch parallel connection
Close unit 11115；First modulation module 1111, by setting first light source unit 11111 and second light source unit 11112
Heart wavelength difference, the corresponding beat frequency generated are W-waveband, and first original signal is modulated to the by the first modulation unit 11113
In the first laser that one light source unit 11111 generates, the control of the first modulation unit 11114 is generated by second light source unit 11112
Second laser phase so that third laser and the 4th laser phase as close as or it is consistent.And first laser and
Two beam laser are combined by second laser by the first optical coupling unit 11115, to generate the first modulation light letter of W-waveband frequency
Number, and the first modulated optical signal is input to the first optical fiber transmission module 1112.Wherein, first light source unit 11111 and second
Light source unit 11112 can be narrow linewidth single-longitudinal-mode fiber laser, it is shone by stimulated radiation, can generate high power radiation
And the output light angle of divergence is small, high with the coupling efficiency of single mode optical fiber, radiant light spectral line is narrow, is suitable for the communication of high speed long-distance optical fiber
The light source of system.Narrow linewidth single-longitudinal-mode fiber laser can guarantee that laser has fabulous coherence, and coherence length can
Up to 10,000 kilometers or more.Narrow cable and wide optical fiber laser is in superhigh precision laser radar, ship hydrophone, spacecraft launching site, satellite
Between communicate and fiber optic communication field have extremely be widely applied.
In one of the embodiments, as shown in Fig. 2 and Fig. 6 a, the first optical fiber transmission module 1112 may include: first
Optical fiber transmission unit 11121 and the first fiber amplifier unit 11122.Wherein, the first optical fiber transmission unit 11121 is single-mode optics
Fibre is used for transmission the first modulated optical signal to the first fiber amplifier unit 11122；First fiber amplifier unit 11122 can be
Fiber amplifier is transmitted for amplifying in optical fiber telecommunications line to the first modulated optical signal, and by the first modulated optical signal
To the first transmitting module 1113.Wherein, single mode optical fiber (Single Mode Fiber): centre pane core is very thin, and (core diameter is generally
9 or 10 μm), intermode dispersion very little is suitable for telecommunication, and such single mode optical fiber has the spectrum width and stability of light source higher
Requirement, i.e. spectrum width wants narrow, and stability will be got well.Single mode optical fiber can support more longer transmission distance compared to multimode fibre,
The Ethernet of 100Mbps so that 1G kilomega network, single mode optical fiber can all support be more than 5000m transmission range.Fiber amplifier can
Full light amplification directly is carried out to signal, there is the transparency well, the relaying suitable for Long-haul optical communication amplifies.
In one of the embodiments, as shown in Fig. 2 and Fig. 6 a, the first transmitting module 1113 may include: the first photoelectricity
Conversion unit 11131, the first power amplification unit 11132 and the first transmission antenna unit 11133.Wherein, the first photoelectric conversion
Unit 11131 is converted into the first modulation signal for receiving the first modulated optical signal, and by the first modulated optical signal, and by the
One modulation signal is transmitted to the first power amplification unit 11132；First power amplification unit 11132 is for receiving the first modulation
Electric signal, and the power for amplifying the first modulation signal obtains the first modulated signal, and the first modulated signal is sent to first
Transmission antenna unit 11133；First transmission antenna unit 11133 be the first transmitting antenna be used for by the first modulated signal emit to
Intended recipient end.Wherein, the first photoelectric conversion unit 11131 can be the photodetector that bandwidth is 100GHz or so, pass through
The photodetector that one bandwidth is 100GHz or so, is converted to electric signal for the optical signal within 100GHz in optical signal.When
The bandwidth of right photodetector can be the optional frequency value within the scope of 75-110GHz, and details are not described herein again.Photoelectric conversion process
Principle be that photon transfers energy to electronics and makes its movement to forming electric current.There are two types of solution routes for this process, most often
Square method is using silicon as the solid unit of main material, or captures using light-sensitive coloring agent molecule the energy of photon.Dye molecule is inhaled
The electronegative electronics made in semiconductor and positively charged hole are separated after receiving photon energy.
In one of the embodiments, as shown in Fig. 3 and Fig. 6 b, first receiving device 112 may include: the first reception mould
Block 1121, the second optical fiber transmission module 1122 and the first demodulation module 1123.Wherein, the first receiving module 1121 is for receiving the
One modulated signal, to obtain the second modulation signal, and it is the first intermediate frequency that the second modulation signal, which is reduced frequency by mixing,
Electric signal, and be the second modulated optical signal by the first medium frequency electric signal modulation, the second modulated optical signal is input to the second optical fiber
Transmission module 1122；Second optical fiber transmission module 1122 leads to the second modulated optical signal for receiving the second modulated optical signal
It crosses optical fiber and is transmitted to the first demodulation module 1123；First demodulation module 1123 is for receiving the transmission of the second optical fiber transmission module 1122
The second modulated optical signal, and demodulate the second modulated optical signal, to obtain the first original signal.
In one of the embodiments, as shown in Fig. 3 and Fig. 6 b, the first receiving module 1121 may include: the first reception
Antenna element 11211, the first low noise power amplifier unit 11212 and the first mixed modulated unit 11213.Wherein, the first receiving antenna
Unit 11211 is used to receive the first modulated signal of target transmitting terminal transmission, and the first modulated signal is transmitted to the first low noise
Power amplifier unit 11212；First low noise power amplifier unit 11212 is carried out for receiving the first modulated signal, and by the first modulated signal
Low noise power amplification is the second modulation signal, and the second modulation signal is transmitted to the first mixed modulated unit 11213；The
One mixed modulated unit 11213 is for receiving the second modulation signal, and optical modulator is according to the variation of modulated signal to light carrier
Amplitude, phase or frequency are modulated to achieve the purpose that transmit information.Reducing frequency by mixing is the first medium frequency electric
Signal, and be the second modulated optical signal by the first medium frequency electric signal modulation, and the second modulated optical signal is input to the second optical fiber
Transmission module 1122.Have with the first receiving antenna unit 11211 with the identical polarization mode of the first transmission antenna unit 11133
First modulated signal of W-waveband is received, received first modulated signal due to space path loss, obtained power compared with
It is small, so the first low noise power amplifier unit 11212 is needed to carry out power amplification, for example, it can use the local vibration source warp of 12GHz
It crosses 6 frequency multipliers and obtains 72GHz local oscillator, by 72GHz local oscillator and the first modulated signal received by the first mixed modulated unit
11211, obtain the first intermediate frequency electric signal of 20-30GHz.Wherein, the local oscillator source of 6 frequency multipliers and 12GHz can be other ginsengs
W frequency range, can be reduced to intermediate frequency 20-30GHz by number.Thereafter through a MZ Mach-Zehnder, by the first medium frequency electric
In signal modulation to laser light source, the second modulated optical signal is obtained.Light carrier is carried out using Mach-Zehnder (MZ) modulator
Modulation.In Mach-Zehnder (MZ) modulator, light carrier is loaded in the modulation of the electric signal on lithium columbate crystal, the folding of crystal
The variation for penetrating index is directly proportional to the variation of electric field strength on crystal is loaded.Therefore, the phase for exporting light carrier can basis
The intensity of load electric field is modulated.This indicates that any electric signal can be converted into optical signal by such simple method.
MZ modulator can realize the single-side belt and double sideband modulation to light carrier.
In one of the embodiments, as shown in Fig. 3 and Fig. 6 b, the second optical fiber transmission module 1122 may include: second
Optical fiber transmission unit 11221 and the second fiber amplifier unit 11222.Wherein, the second optical fiber transmission unit 11221 can be single mode
Optical fiber is used for transmission the second modulated optical signal to the second fiber amplifier unit 11222；Second fiber amplifier unit 11222 is used for
The second modulated optical signal is amplified in optical fiber telecommunications line, and the second modulated optical signal is transmitted to the first demodulation module
1123.Wherein, single mode optical fiber (Single ModeFiber): centre pane core is very thin (core diameter is generally 9 or 10 μm), intermode
Dispersion very little is suitable for telecommunication, and such single mode optical fiber has higher requirement to the spectrum width and stability of light source, i.e. spectrum width is wanted
Narrow, stability will be got well.Single mode optical fiber can support more longer transmission distance compared to multimode fibre, 100Mbps Ethernet so that
1G kilomega network, single mode optical fiber can all support be more than 5000m transmission range.Fiber amplifier directly can carry out Quan Guangfang to signal
Greatly, there is the transparency well, the relaying suitable for Long-haul optical communication amplifies.
In one of the embodiments, as shown in Fig. 3 and Fig. 6 b, the first demodulation module 1123 may include: the first filtering
Unit 11231 and the first demodulating unit 11232.Wherein, the first filter unit 11231 can be tunable optical filter, for connecing
The second modulated optical signal is received, and filters out noise signal, to obtain the first filtering signal, and the first filtering signal is transmitted to first
Demodulating unit 11232；First demodulating unit 11232 can be homodyne coherence detector or envelope demodulator, for receiving
First filtering signal of the first filter unit 11231 transmission, demodulates the first filtering signal, to obtain the first original signal.Second
Modulated optical signal is input to demodulating end by the second optical fiber transmission module 1122, inhibits lower by a tunable optical filter
Signal frequency side band, light carrier and spontaneous emission noise etc., obtain upper side band, eventually by homodyne coherence detector or envelope solution
Device is adjusted to obtain the first original signal.
In one of the embodiments, as shown in Figure 1, the second link 12 is for the W-waveband between from second end to first end
Light carrier radio communication, the second link 12 may include: the second emitter 121 and the second reception device 122.Wherein, second
Emitter 121 is used for the central wavelength by setting light source, generates W-waveband millimeter wave with beat frequency, and by the second original signal
It is modulated on W-waveband millimeter wave, to obtain the second modulated signal, and the second modulated signal is sent to the second reception device 122；
Second reception device 122 is used to receive the second modulated signal of the second emitter 121 transmission, demodulates the second modulated signal, with
Obtain the second original signal；First link 11 and 12 carrier frequency of the second link are W band frequency, the first link 11 and the second link
12 center frequency is not completely the same, the range 2-3GHz of center frequency difference.For example, if the center frequency of the first link 11
Rate is set as 98GHz, then the centre frequency of the second link 12 is set as 100GHz.Certainly, the revenue centre frequency of the first link 11
It is not limited to above-mentioned 98GHz, other frequencies of W frequency range can also be set as, then the centre frequency of the second link 12, which accordingly changes, is
Can, details are not described herein again.
In one of the embodiments, as shown in Fig. 4 and Fig. 7 a, the second emitter 121 may include: the second modulation mould
Block 1211, third optical fiber transmission module 1212 and the second transmitting module 1213.Wherein, the second modulation module 1211 is for generating W
Wave band millimeter wave, and the second original signal is modulated on W-waveband millimeter wave, to obtain third modulated optical signal, and by third
Modulated optical signal is input to third optical fiber transmission module 1212；Third optical fiber transmission module 1212 is for receiving third modulation light letter
Number, and third modulated optical signal is transmitted through the fiber to the second transmitting module 1213；Second transmitting module 1213 is for receiving
The third modulated optical signal that third optical fiber transmission module 1212 transmits, and converted third modulated optical signal to by photodetection
Second modulated signal to obtain the second modulated signal, and is sent to second using the second transmitting antenna by third modulation signal
Reception device 122.
In one of the embodiments, as shown in Fig. 4 and Fig. 7 a, the second modulation module 1211 may include: third light source
Unit 12111, the 4th light source unit 12112, the second modulation unit 12113, second phase control unit 12114 and the second optocoupler
Unit 12115 is closed, the second modulation unit 12113 of series connection of third light source unit 12111 forms third branch, the 4th light source unit
12112 series connection second phase control units 12114 form the 4th branch, the second light of connecting after third branch and the 4th branch circuit parallel connection
Coupling unit 12115；Second modulation module 1211 passes through setting third light source unit 12111 and the 4th light source unit 12112
Central wavelength difference, the corresponding beat frequency generated are W-waveband, and the second original signal is passed through the second modulation unit 12113 for second
Original signal is modulated to third light source unit 12111 and generates on third laser, and second phase control unit 12114 controls the 4th light
The phase for the 4th laser that source unit 12112 generates so that third laser and the 4th laser phase as close as or one
It causes.Two beam laser are combined by third laser and the 4th laser by the second optical coupling unit 12115, to generate W-waveband frequency
Third modulated optical signal, and third modulated optical signal is input to third optical fiber transmission module 1212.Wherein, third light source unit
12111 and the 4th light source unit 12112 can be narrow linewidth single-longitudinal-mode fiber laser, it by stimulated radiation shine, can produce
It gives birth to high power radiation and the output light angle of divergence is small, high with the coupling efficiency of single mode optical fiber, radiant light spectral line is narrow, and it is long to be suitable for high speed
Light source apart from optical fiber telecommunications system.Narrow linewidth single-longitudinal-mode fiber laser can guarantee that laser has fabulous coherence,
Its coherence length is up to 10,000 kilometers or more.Narrow cable and wide optical fiber laser is in superhigh precision laser radar, ship hydrophone, boat
The docking of its device, intersatellite communication and fiber optic communication field, which have, to be extremely widely applied.
In one of the embodiments, as shown in Fig. 4 and Fig. 7 a, third optical fiber transmission module 1212 may include: third
Optical fiber transmission unit 12121 and third fiber amplifier unit 12122.Third optical fiber transmission unit 12121 is single mode optical fiber, is used for
Third modulated optical signal is transmitted to third fiber amplifier unit 12122；Third fiber amplifier unit 12122 can be fiber amplifier
Third modulated optical signal for amplifying in optical fiber telecommunications line to third modulated optical signal, and is transmitted to the second hair by device
Penetrate module 1213.Wherein, single mode optical fiber (Single Mode Fiber) centre pane core is very thin (core diameter is generally 9 or 10 μm),
Its intermode dispersion very little is suitable for telecommunication, and such single mode optical fiber has higher requirement to the spectrum width and stability of light source, i.e.,
Spectrum width wants narrow, and stability will be got well.Single mode optical fiber can support more longer transmission distance compared to multimode fibre, in the ether of 100Mbps
Net so that 1G kilomega network, single mode optical fiber can all support be more than 5000m transmission range.Fiber amplifier can directly carry out signal
Full light amplification has the transparency well, and the relaying suitable for Long-haul optical communication amplifies.
In one of the embodiments, as shown in Fig. 4 and Fig. 7 a, the second transmitting module 1213 may include: the second photoelectricity
Conversion unit 12131, the second power amplification unit 12132 and the second transmission antenna unit 12133.Wherein, the second photoelectric conversion
Unit 12131 is converted into third modulation signal for receiving third modulated optical signal, and by third modulated optical signal, and by the
Three modulation signals are transmitted to the second power amplification unit 12132；Second power amplification unit 12132 is for receiving third modulation
Electric signal, and the power for amplifying third modulation signal obtains the second modulated signal, and the second modulated signal is sent to second
Transmission antenna unit 12133；Second transmission antenna unit 12133 is for emitting the second modulated signal to the second reception device
122.Wherein, the second photoelectric conversion unit 12131 can be the photodetector that bandwidth is 100GHz or so, pass through a band
Width is the photodetector of 100GHz or so, and the optical signal within 100GHz in optical signal is converted to electric signal.Certain photoelectricity
The bandwidth of detector can be the optional frequency value within the scope of 75-110GHz, and details are not described herein again.The principle of photoelectric conversion process
It is that photon transfers energy to electronics and makes its movement to forming electric current.There are two types of solution route, most common processes for this process
Using silicon as the solid unit of main material, or capture using light-sensitive coloring agent molecule the energy of photon.Dye molecule absorbs photon
The electronegative electronics made in semiconductor and positively charged hole are separated after energy.
In one of the embodiments, as shown in Fig. 5 and Fig. 7 b, the second reception device 122 may include: the second reception mould
Block 1221, the 4th optical fiber transmission module 1222 and the second demodulation module 1223.Wherein, the second receiving module 1221 is for receiving the
Two modulated signals, to obtain the 4th modulation signal, and it is the second intermediate frequency that the 4th modulation signal, which is reduced frequency by mixing,
Electric signal, and be the 4th modulated optical signal by the second medium frequency electric signal modulation, the 4th modulated optical signal is input to the 4th optical fiber
Transmission module 1222；4th optical fiber transmission module 1222 leads to the 4th modulated optical signal for receiving the 4th modulated optical signal
It crosses optical fiber and is transmitted to the second demodulation module 1223；Second demodulation module 1223 is for receiving the transmission of the 4th optical fiber transmission module 1222
The 4th modulated optical signal, and demodulate the 4th modulated optical signal, to obtain the second original signal.
In one of the embodiments, as shown in Fig. 5 and Fig. 7 b, the second receiving module 1221 may include: the second reception
Antenna element 12211, the second low noise power amplifier unit 12212 and the second mixed modulated unit 12213, the second receiving antenna unit
12211 for receiving the second modulated signal of target transmitting terminal transmission, and the second modulated signal is transmitted to the second low noise power amplifier
Unit 12212；Second low noise power amplifier unit 12212 carries out low noise for receiving the second modulated signal, and by the second modulated signal
Power amplification is the 4th modulation signal, and the 4th modulation signal is transmitted to the second mixed modulated unit 12213；Second is mixed
Frequency modulation unit 12213 receives the 4th modulation signal, amplitude of the optical modulator according to the variation of modulated signal to light carrier, phase
Position or frequency are modulated to achieve the purpose that transmit information.Reducing frequency by mixing is the second intermediate frequency electric signal, and will
Second medium frequency electric signal modulation is the 4th modulated optical signal, and the 4th modulated optical signal is input to the 4th optical fiber transmission module
1222.Have with and the identical polarization mode of the second transmission antenna unit 12133 the second receiving antenna unit 12211 by W-waveband
The second modulated signal receive, for received second modulated signal due to space path loss, obtained power is smaller, so
The second low noise power amplifier unit 11212 is needed to carry out power amplification, for example, and then can use the local vibration source of 12GHz by 6
Frequency multiplier obtains 72GHz local oscillator, by 72GHz local oscillator and the second modulated signal received by the second mixed modulated unit
11211, obtain the secondth intermediate frequency electric signal of 20-30GHz.Wherein, the local oscillator source of 6 frequency multipliers and 12GHz can be other
W frequency range can be reduced to intermediate frequency 20-30GHz by parameter.Thereafter through a MZ Mach-Zehnder, by the first intermediate frequency
Electric signal is modulated on laser light source, obtains the second modulated optical signal.Using Mach-Zehnder (MZ) modulator to light carrier into
Row modulation.In Mach-Zehnder (MZ) modulator, light carrier is loaded in the modulation of the electric signal on lithium columbate crystal, crystal
The variation of electric field strength on crystal is directly proportional to load for the variation of refractive index.Therefore, the phase for exporting light carrier can root
It is modulated according to the intensity of load electric field.This indicates that through such simple method, any electric signal can be converted into light letter
Number.MZ modulator can realize the single-side belt and double sideband modulation to light carrier.
In one of the embodiments, as shown in Fig. 5 and Fig. 7 b, the 4th optical fiber transmission module 1222 may include: the 4th
Optical fiber transmission unit 12221 and the 4th fiber amplifier unit 12222.Wherein, the 4th optical fiber transmission unit 12221 is single-mode optics
Fibre is used for transmission third modulated optical signal to the 4th fiber amplifier unit 12222；4th fiber amplifier unit 12222 is used for light
The 4th modulated optical signal is amplified in fiber communication route, and the 4th modulated optical signal is transmitted to the second demodulation module
1223.Wherein, single mode optical fiber (Single ModeFiber): centre pane core is very thin (core diameter is generally 9 or 10 μm), intermode
Dispersion very little is suitable for telecommunication, and such single mode optical fiber has higher requirement to the spectrum width and stability of light source, i.e. spectrum width is wanted
Narrow, stability will be got well.Single mode optical fiber can support more longer transmission distance compared to multimode fibre, 100Mbps Ethernet so that
1G kilomega network, single mode optical fiber can all support be more than 5000m transmission range.Fiber amplifier directly can carry out Quan Guangfang to signal
Greatly, there is the transparency well, the relaying suitable for Long-haul optical communication amplifies.
In one of the embodiments, as shown in Fig. 5 and Fig. 7 b, the second demodulation module 1223 may include: the second filtering
Unit 12231 and the second demodulating unit 12232.Wherein, the second filter unit 1221 can be tunable optical filter, for receiving
4th modulated optical signal, and noise signal is filtered out, to obtain the second filtering signal, and the second filtering signal is transmitted to the second solution
Adjust unit 12232；Second demodulating unit 12232 can be homodyne coherence detector or envelope demodulator, for receiving the
Second filtering signal of two filter units 1221 transmission, demodulates the second filtering signal, to obtain the second original signal.4th modulation
Optical signal is input to demodulating end by the 4th optical fiber transmission module 1222, inhibits lower signal by a tunable optical filter
Sideband, light carrier and spontaneous emission noise etc., obtain upper side band, eventually by homodyne coherence detector or envelope demodulator
Obtain the second original signal.
The first link 11 may include the first dual-mode antenna in one of the embodiments, and the second link 12 may include
Second dual-mode antenna；First dual-mode antenna may include the first transmitting antenna and the first receiving antenna, and described first sends out
It penetrates antenna and the first receiving polarization mode is unanimously horizontal plan or vertical polarization；Second dual-mode antenna can wrap
The second transmitting antenna and the second receiving antenna are included, and second transmitting antenna and the second receiving polarization mode are unanimously water
Flat plan or vertical polarization；Wherein, if the polarization mode of the first dual-mode antenna is horizontal polarization, the pole of the second dual-mode antenna
Change mode is vertical polarization；If the polarization mode of the first dual-mode antenna is vertical polarization, the polarization mode of the second dual-mode antenna
For horizontal polarization.The polarization mode of second dual-mode antenna of the first dual-mode antenna of the first link 11 and the second link 12 is different
It causes, the interference between uplink and downlink signal can be effectively prevented.
Above-mentioned full duplex light carrier radio communication system 1 may include the first link 11 and the second link 12, the first link 11
For the light carrier radio communication of the W-waveband between from first end to second end, the first link of full duplex light carrier radio communication system 1
11 pass through the central wavelength of setting light source by the first emitter 111, generate W-waveband millimeter wave with beat frequency, and former by first
In beginning signal modulation to W-waveband millimeter wave, to obtain the first modulated signal, then the first modulated signal is sent to the first reception and is filled
Set 112；First receiving device 112 demodulates the first modulated signal by receiving the first modulated signal, to obtain the first original letter
Number；Second link 12 is consistent with the network topology structure of the first link 11, the light of the W-waveband between realizing from second end to first end
Carrier radio communication.In full duplex light carrier radio communication system 1, original signal is modulated to W wave in the first emitter 111
The complicated signal processings such as section, phase controlling and electric light conversion, generate W-waveband millimeter, network configuration operations using beat frequency
Simply, cost substantially reduces, and generates W-waveband millimeter wave as carrier frequency using beat frequency and can be realized higher access bandwidth.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.It should be noted that " in an embodiment ", " example of the application
Such as ", " for another example ", it is intended to the application is illustrated, rather than for limiting the application.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of full duplex light carrier radio communication system, which is characterized in that including the first link and the second link,
First link, for the light carrier radio communication of the W-waveband between from first end to second end, first link includes
First emitter and first receiving device, wherein
First emitter generates W-waveband millimeter wave with beat frequency for the central wavelength by setting light source, and by the
One original signal is modulated on W-waveband millimeter wave, to obtain the first modulated signal, and first modulated signal is sent to
One reception device；
The first receiving device, first modulated signal sent for receiving first emitter, described in demodulation
First modulated signal, to obtain first original signal；
Second link, for the light carrier radio communication of the W-waveband between from second end to first end, and second link with
The network topology structure of first link is consistent.
2. full duplex light carrier radio communication system according to claim 1, which is characterized in that the first emitter packet
It includes:
First modulation module is modulated on W-waveband millimeter wave for generating W-waveband millimeter wave, and by first original signal,
To obtain the first modulated optical signal, and the first modulated optical signal is input to the first optical fiber transmission module；
First optical fiber transmission module leads to for receiving first modulated optical signal, and by first modulated optical signal
It crosses optical fiber and is transmitted to the first transmitting module；
First transmitting module, for receiving first modulated optical signal of the first optical fiber transmission module transmission, and
The first modulation signal is converted by first modulated optical signal by photodetection, to obtain the first modulated signal, and benefit
First modulated signal is sent to first receiving device with the first transmitting antenna.
3. full duplex light carrier radio communication system according to claim 2, which is characterized in that the first modulation module packet
It includes: first light source unit, second light source unit, the first modulation unit, first phase control unit and the first optical coupling unit, institute
It states first light source unit series connection first modulation unit and forms the first branch, the second light source unit series connection first phase
Position control unit forms second branch, the first optical coupling list of connecting after the first branch and second branch parallel connection
Member；
First modulation module, by the way that the central wavelength difference of the first light source unit and the second light source unit is arranged,
The corresponding beat frequency generated is W-waveband, and original signal is modulated to described the by first modulation unit by original signal
One light source unit generates in first laser, and the first phase control unit controls the second light source unit generates second and swashs
Two beam laser are combined by the phase of light, the first laser and the second laser by the first optical coupling unit, to generate W wave
First modulated optical signal of band frequency, and the first modulated optical signal is input to the first optical fiber transmission module.
4. full duplex light carrier radio communication system according to claim 2, which is characterized in that first optical fiber transmits mould
Block includes:
First optical fiber transmission unit is single mode optical fiber, is used for transmission first modulated optical signal to the first fiber amplifier unit；
The first fiber amplifier unit, for being amplified in optical fiber telecommunications line to first modulated optical signal, and will
First modulated optical signal is transmitted to first transmitting module.
5. full duplex light carrier radio communication system according to claim 2, which is characterized in that the first transmitting module packet
It includes:
First photoelectric conversion unit is converted into for receiving first modulated optical signal, and by first modulated optical signal
First modulation signal, and first modulation signal is transmitted to the first power amplification unit；
First power amplification unit for receiving first modulation signal, and amplifies first modulation signal
Power obtain the first modulated signal, and first modulated signal is sent to the first transmitting unit；
First transmission antenna unit, for emitting first modulated signal to intended recipient end.
6. full duplex light carrier radio communication system according to claim 1, which is characterized in that the first receiving device packet
It includes:
First receiving module to obtain the second modulation signal, and described second is adjusted for receiving first modulated signal
It is the first intermediate frequency electric signal that electric signal processed, which reduces frequency by mixing, and is the second modulation by the first medium frequency electric signal modulation
Second modulated optical signal is input to the second optical fiber transmission module by optical signal；
Second optical fiber transmission module leads to for receiving second modulated optical signal, and by second modulated optical signal
It crosses optical fiber and is transmitted to the first demodulation module；
First demodulation module, for receiving second modulated optical signal of the second optical fiber transmission module transmission, and
Second modulated optical signal is demodulated, to obtain first original signal.
7. full duplex light carrier radio communication system according to claim 6, which is characterized in that the first receiving module, comprising:
First receiving antenna unit for receiving first modulated signal of target transmitting terminal transmission, and described first is adjusted
Signal processed is transmitted to the first low noise power amplifier unit；
The first low noise power amplifier unit, for receiving first modulated signal, and first modulated signal progress is low
Power amplification of making an uproar is the second modulation signal, and second modulation signal is transmitted to the first mixed modulated unit；
The first mixed modulated unit receives second modulation signal, and reducing frequency by mixing is the first intermediate frequency telecommunications
Number, and be the second modulated optical signal by the first medium frequency electric signal modulation, and second modulated optical signal is input to the
Two optical fiber transmission modules.
8. full duplex light carrier radio communication system according to claim 6, which is characterized in that the second optical fiber transmission module packet
It includes:
Second optical fiber transmission unit is used for transmission second modulated optical signal to the second fiber amplifier unit；
The second fiber amplifier unit, for being amplified in optical fiber telecommunications line to second modulated optical signal, and will
Second modulated optical signal is transmitted to first demodulation module.
9. full duplex light carrier radio communication system according to claim 6, which is characterized in that the first demodulation module packet
It includes:
First filter unit for receiving second modulated optical signal, and filters out noise signal, to obtain the first filtering letter
Number, and first filtering signal is transmitted to the first demodulating unit；
First demodulating unit is used to receive first filtering signal of first filter unit transmission, demodulates described the
One filtering signal, to obtain first original signal.
10. full duplex light carrier radio communication system according to claim 1, which is characterized in that first link includes
First dual-mode antenna, second link include the second dual-mode antenna；
First dual-mode antenna includes the first transmitting antenna and the first receiving antenna, and first transmitting antenna and first connects
Receiving the Research of Antenna Polarization is unanimously horizontal plan or vertical polarization；Second dual-mode antenna includes the second transmitting antenna and the
Two receiving antennas, and second transmitting antenna and the second receiving polarization mode are unanimously horizontal plan or vertical pole
Change；Wherein,
If the polarization mode of first dual-mode antenna is horizontal polarization, the polarization mode of second dual-mode antenna is vertical
Polarization；If the polarization mode of first dual-mode antenna is vertical polarization, the polarization mode of second dual-mode antenna is water
Mean pole.
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| CN114079506A (en) * | 2020-08-17 | 2022-02-22 | 中国电信股份有限公司 | Network access device and method for terminal to access network and storage medium |
| CN114488433A (en) * | 2022-02-08 | 2022-05-13 | 耀芯电子(浙江)有限公司 | Single-optical-fiber high-speed full-duplex data transmission device |
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