CN106506087A - A kind of light-carried wireless broadband system - Google Patents
A kind of light-carried wireless broadband system Download PDFInfo
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- CN106506087A CN106506087A CN201610947102.3A CN201610947102A CN106506087A CN 106506087 A CN106506087 A CN 106506087A CN 201610947102 A CN201610947102 A CN 201610947102A CN 106506087 A CN106506087 A CN 106506087A
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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
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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
- H04B10/516—Details of coding or modulation
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optics & Photonics (AREA)
- Optical Communication System (AREA)
Abstract
The present invention relates to a kind of light-carried wireless broadband system, including central station and base station, central station includes at least two laser modules, the input of laser module output connection N × 1 photo-coupler, the outfan of N × 1 photo-coupler connects the first port of optical circulator, Fabry amber grace laser instrument connects the second port of optical circulator, 3rd port of optical circulator connects the input of 1 × N photo-couplers, each outfan of 1 × N photo-couplers connects the input of electrooptic modulator by optical filter, and the outfan of electrooptic modulator connects respective base station by optical fiber.The system can produce multi-path light microwave signal, system device utilization rate has obtained very big lifting, system effectiveness is similarly obtained lifting, and on the basis of same satisfaction produces multi-path light microwave signal, the broadband system structure that the present invention is provided has obtained greatly simplifying.
Description
Technical field
The present invention relates to a kind of light-carried wireless broadband system, belongs to light-carried wireless broadband connections field.
Background technology
The arrival of information age is greatly promoted the development and change of communication technology, the work for also giving people and life band
It is bigger convenient to have come.Fiber-to-the-home, mobile communication 4G（Fourth Generation）Thousand ten thousand have all been had been enter into etc. technology
Family.But, to broadband, at a high speed, the demand that accesses easily communication technology remain people the core of communication technology expected, this
Also promote the research and development of new communication technology.Fiber optic communication can realize high speed, great Rong with its huge superiority bandwidth
The communication of amount；The advantage of mobile communication is then flexible, convenient, and RoF technology has exactly merged the excellent of fiber optic communication and mobile communication
Gesture and the emerging technology that produces.
RoF technology be mainly concerned with photoproduction microwave, modulates information, the optical transport of microwave signal, the transmitting of microwave signal with
The technology such as reception.Wherein, photoproduction microwave technology is a core technology therein, produces tunable, broadband, phase noise low
Microwave signal most important to light-carried wireless broadband system.The producing method of photoproduction microwave mainly has light heterodyne method and light at present
Injection method.The principle of light heterodyne method is to produce desired beat signal using the difference on the frequency of two-beam, then passes through photodetection
Device exports corresponding microwave signal, has the disadvantage with larger phase noise.Light injection method can be effectively reduced the micro- of generation
The phase noise of ripple signal, is a kind of method of great using value.Prior art [1] (referring to F.Y.Lin,
J.M.Liu.Diverse waveform generation using semiconductor lasers for radar and
Microwave applications, IEEE J.Quantum Electron.2004. and S.C.Chan,
J.M.Liu.Tunable narrow-linewidth photonic microwave generation using
Semiconductor laser dynamics, IEEE J.Sel.Topics Quantum Electron.2004. and
S.K.Hwang,et al.Characteristics of period-one oscillations in semiconductor
lasers subject to optical injection,IEEE J.Sel.Topics Quantum Electron.2004)
The technology that a kind of light injection produces optical microwave signal is disclosed, using the tunable semiconductor laser note of several centre wavelengths
Enter to another semiconductor laser and produce beat frequency phenomenon, beat frequency is the central wavelength difference of two laser instrument, this beat signal is
For photoproduction microwave signal.Prior art [2] is (referring to Y.S.Juan, F.Y.Lin.Demonstration of ultra-
wideband(UWB)over fiber based on optical pulse-injected semiconductor laser,
Optics Express.2010. and Y.-H.Liao, et al.Dynamical characteristics of a dual-
beam optically injected semiconductor laser.IEEE Journal of Selected Topics
2013) in Quantum Electronics disclose a kind of method that dual-beam injection produces microwave signal, double due to adopting
Light beam injects, and the method can produce the microwave signal higher than prior art [1] frequency.
In sum, prior art [1] and [2] can produce optical microwave signal, but have the shortcomings that common, i.e.,
Set of system can only produce optical microwave signal all the way, and devices use rate is low, and system effectiveness is low, and working as needs multiplex optical micro-
During ripple signal, multiple systems are needed, input cost is high.
Content of the invention
It is an object of the invention to provide a kind of light-carried wireless broadband system, can only in order to solve existing a set of broadband system
Produce the problem of optical microwave signal all the way.
For achieving the above object, the solution of the present invention includes a kind of light-carried wireless broadband system, including central station and base station,
The central station includes N number of laser module, N >=2, and each laser module is used for the laser for producing Wavelength tunable, described N number of sharp
The input of light device module output connection N × 1 photo-coupler, the of the outfan connection optical circulator of N × 1 photo-coupler
Single port, Fabry-Perot grace laser instrument connect the second port of the optical circulator, the 3rd port connection of the optical circulator
The input of 1 × N photo-couplers, each outfan of 1 × N photo-couplers connect the defeated of electrooptic modulator by optical filter
Enter end, the outfan of each electrooptic modulator is used for connecting respective base station by optical fiber.
The laser module is made up of the tunable laser, Polarization Controller and adjustable optical attenuator that are sequentially connected.
The outfan of N × 1 photo-coupler connects the first port of the optical circulator by optoisolator.
The Fabry-Perot grace laser instrument connects the second port of the optical circulator by adjustable optical attenuator.
The base station includes photodetector, radio frequency amplifier and the transmitting terminal antenna being sequentially connected, each electrooptic modulator
Corresponding photodetector is connected by optical fiber.
Each electrooptic modulator is loaded with baseband digital information.
The length range of the optical fiber is 1km～50km.
In the light-carried wireless broadband system that the present invention is provided, at least two laser modules in central station, are included, each
Laser module can produce the laser of Wavelength tunable, be additionally provided with the Fabry-Perot with various modes in central station
Laser instrument, the pattern that the laser of the different wave length that laser module sends is different from fabry-Perot type laser produce beat frequency now
As so as to output multi-channel light microwave signal, then the optical band pass filter using different centre wavelengths leaches each road light microwave letter
Number.So, multichannel can be produced by mating reaction of the laser of different wave length with the different mode of fabry-Perot type laser
The system of light microwave signal, i.e., one can produce multi-path light microwave signal, and system device utilization rate has obtained very big lifting, system
Efficiency is similarly obtained lifting, and same meet produce multi-path light microwave signal on the basis of, only need a set of broadband system to be
Can, input cost is greatly lowered, and overall structure has also obtained greatly simplifying.
Description of the drawings
Fig. 1 is light-carried wireless broadband system structural representation；
Fig. 2 is the corresponding relation schematic diagram of transmitting terminal antenna and receiving terminal antenna.
Specific embodiment
The present invention will be further described in detail below in conjunction with the accompanying drawings.
The light-carried wireless broadband system that the present invention is provided is injected based on multiple beam and produces multi-path light microwave signal.Such as Fig. 1
Shown, the system integrally includes two parts, centered on station 40 and base station 41.
Wherein, central station includes that N number of laser module, N >=2, each laser module are used for the laser for producing Wavelength tunable,
A kind of specific embodiment of laser module is given in the present embodiment, as shown in figure 1, laser module includes being sequentially connected
Tunable laser, Polarization Controller and adjustable optical attenuator.As the number of laser module is N, so, according to Fig. 1
In sign for, the 1st laser module includes tunable laser 1, Polarization Controller 2 and the adjustable light decay being sequentially connected
Subtract device 3, the 2nd laser module includes tunable laser 7, Polarization Controller 8 and the adjustable optical attenuator being sequentially connected
9 ... ..., n-th laser module includes tunable laser 29, Polarization Controller 30 and the adjustable optical attenuator being sequentially connected
31.
This N number of adjustable optical attenuator：The output connection of adjustable optical attenuator 3, adjustable optical attenuator 9 and adjustable optical attenuator 31
N number of input of N × 1 photo-coupler 4, the outfan of N × 1 photo-coupler 4 connect the input of optoisolator 5, optoisolator 5
Outfan connect optical circulator 6 I ports, fabry-Perot type laser 11 by adjustable optical attenuator 10 connect the ring of light
The ii port of shape device 6, the ii I port of optical circulator 6 connect the input of 1 × N photo-couplers 12.
For certain light microwave signal all the way, below by taking the first via as an example, it is as follows which produces process：Tunable laser 1 is produced
Raw continuous wave laser, adjusts its polarization state using Polarization Controller 2, controls its luminous power size using adjustable optical attenuator 3, so
After export and give N × 1 photo-coupler, afterwards in the presence of optoisolator 5, ensure that its one-way transmission, hereafter gone in ring by light
Device 6 is injected into fabry-Perot type laser 11 by optical attenuator 10, adjusts centre wavelength and the method cloth of tunable laser 1
In-first pattern match of Perot Laser 11, i.e. two wavelength difference scopes are 0.08nm～0.8nm, beat frequency now occur existing
As the light microwave of reference frequency output 10GHz～100GHz.For other tunable laser, second scalable laser
The mechanism of device tunable laser 7 and second pattern of fabry-Perot type laser 11 and said process phase
With ... ..., the n-th pattern of n-th tunable laser tunable laser 29 and fabry-Perot type laser 11
Mechanism is same as described above.
Light microwave signal of the output comprising N number of frequency of fabry-Perot type laser 11, goes in ring through optical attenuator 10 and light
After device 6,1 × N photo-couplers 12 are entered.N number of outfan of 1 × N photo-couplers 12 exports N roads signal, wherein, 1 × N light respectively
First outfan of bonder 12 connects the input of optical filter 13, the outfan connection electrooptic modulator 15 of optical filter 13
Input, electrooptic modulator 15 electrical input input have baseband digital information 14, i.e. electrooptic modulator 15 to be loaded with base band
Digital information 14；Second outfan of 1 × N photo-couplers 12 connects the input of optical filter 21, the output of optical filter 21
The input of end connection electrooptic modulator 22, the electrical input input of electrooptic modulator 22 have baseband digital information 23, i.e. electric light
Manipulator 22 is loaded with baseband digital information 23；……；The N outfans of 1 × N photo-couplers 12 connect the defeated of optical filter 32
Enter end, the outfan of optical filter 32 connects the input of electrooptic modulator 33, and the electrical input input of electrooptic modulator 33 has
Baseband digital information 34, i.e. electrooptic modulator 33 are loaded with baseband digital information 34.
These optical filters are in the associative mode of band filter, centre wavelength and fabry-Perot type laser
Cardiac wave length is identical, by adjusting the passband parameter of optical filter, can leach corresponding road light microwave signal, specially：Adjust light
The passband parameter of wave filter 13, leaches first via light microwave signal, adjusts the passband parameter of optical filter 21, leaches the second road light
Microwave signal ... ..., adjusts the passband parameter of optical filter 32, leaches N roads light microwave signal.
Therefore, using multimode fabry-Perot type laser and multiple tunable laser, the tunable laser of different wave length
The device pattern different from fabry-Perot type laser produces beat frequency phenomenon, so as to output multi-channel light microwave signal, then using not
Different light microwave signals are leached with the optical band pass filter of centre wavelength.
By studying to the wavelength relationship of tunable laser and fabry-Perot type laser, can obtain following
As a result：The centre wavelength of tunable laser 1 with the central wavelength difference of 11 first patterns of fabry-Perot type laser is
The middle cardiac wave of 0.08nm～0.8nm, the centre wavelength of tunable laser 7 and 11 second patterns of fabry-Perot type laser
Long difference is 0.08nm～0.8nm ... ..., the centre wavelength of tunable laser 29 and 11 n-th mould of fabry-Perot type laser
When the central wavelength difference of formula is 0.08nm～0.8nm, N roads optical microwave signal can be produced, frequency range be 10GHz～
100GHz.
Connected by optical fiber between central station and each base station, i.e., the outfan of each electrooptic modulator is corresponding by optical fiber connection
Base station, specially：The outfan of electrooptic modulator 15 connects first base station, the outfan of electrooptic modulator 22 by optical fiber 16
Second base station ... ... is connected by optical fiber 24, the outfan of electrooptic modulator 33 connects N base stations by optical fiber 35.In addition, this
In embodiment, the length of the light between central station and base station there are certain requirements, and length is 1km～50km, realizes optical microwave
The long-distance transmissions of signal.Studied by the impact to fiber lengths, obtain following result：If fiber lengths are less than
1km, then cannot embody the advantage of light-carried wireless broadband technology, and now high cost of the cost of system than wireless communication system
A lot；If fiber lengths are more than 50km, the decay of optical signal is larger, needs, using measures such as relayings, to increased system multiple
Polygamy.
Base station 41 includes N number of base station, and wherein, first base station includes that the photodetector 17, radio frequency being sequentially connected amplifies
Device 18 and transmitting terminal antenna 19；Second base station includes photodetector 25, radio frequency amplifier 26 and the transmitting terminal being sequentially connected
Antenna 27；……；N-th base station includes photodetector 36, radio frequency amplifier 37 and the transmitting terminal antenna 38 being sequentially connected, with
Realize the transmitting of the light microwave signal after modulation.
Base station 41 is attached by atmospheric channel with receiving terminal antenna, specially：As shown in Fig. 2 transmitting terminal antenna 19
It is attached by atmospheric channel with receiving terminal antenna 20, transmitting terminal antenna 27 is carried out by atmospheric channel with receiving terminal antenna 28
Connection ... ..., transmitting terminal antenna 38 is attached by atmospheric channel with receiving terminal antenna 39.Also, receiving terminal antenna 20
Frequency is identical with transmitting terminal antenna 19, to receive its signal that launches；The frequency of receiving terminal antenna 28 and 27 phase of transmitting terminal antenna
With to receive its signal that launches；……；The frequency of receiving terminal antenna 39 is identical with transmitting terminal antenna 38, is launched with receiving which
Signal.
For first via signal, its complete signals transmission is：Tunable laser 1 produces continuous wave and swashs
Light, adjusts its polarization state using Polarization Controller 2, controls its luminous power size using adjustable optical attenuator 3, is then output to N
× 1 photo-coupler, afterwards in the presence of optoisolator 5, ensure that its one-way transmission, hereafter pass through light by optical circulator 6
Attenuator 10 is injected into fabry-Perot type laser 11, and the centre wavelength and Fabry-Perot for adjusting tunable laser 1 swashs
First pattern match of light device 11, i.e. two wavelength difference scopes are 0.08nm～0.8nm, and beat frequency phenomenon, output frequency now occur
The light microwave of rate scope 10GHz～100GHz；Baseband digital information 14 arrives first via light microwave by the modulation of electrooptic modulator 15
On signal, and long-distance transmissions are realized through optical fiber 16, optical signal is changed into by the signal of telecommunication by electrooptic modulator 17, then by penetrating
Audio amplifier 18 realizes the amplification of signal, realizes transmitting by transmitting terminal antenna 19, reaches receiving terminal through atmospheric signal, connect after this
Receiving end antenna 20 is realized the reception to signal and does subsequent treatment.Modulation, transmission, transmitting for the light microwave signal on other roads
Same as described above with the process of reception.
In above-described embodiment, the outfan of N × 1 photo-coupler connects the first port of optical circulator by optoisolator,
The effect of optoisolator is the one-way transmission for ensureing optical signal, so, above-mentioned embodiment is a kind of embodiment of optimization, makees
For general embodiment, optoisolator can be not provided with.
In above-described embodiment, Fabry-Perot grace laser instrument connects the second port of optical circulator by adjustable optical attenuator,
Adjustable optical attenuator is used for controlling luminous power size, so, above-mentioned embodiment is equally a kind of embodiment of optimization, as
General embodiment, adjustable optical attenuator here can be not provided with.
Specific embodiment is presented above, but the present invention is not limited to described embodiment.The base of the present invention
This thinking is the structure of above-mentioned central station, and belongs to routine techniquess due to base station, so, present invention structure not to base station
Make restriction, for those of ordinary skill in the art, according to the teachings of the present invention, design the model of various modifications, formula,
Parameter simultaneously need not spend creative work.Without departing from the principles and spirit of the present invention embodiment is carried out
Change, modification, replacement and modification are still fallen within protection scope of the present invention.
Claims (7)
1. a kind of light-carried wireless broadband system, including central station and base station, it is characterised in that the central station includes N number of laser
Device module, N >=2, each laser module are used for the laser for producing Wavelength tunable, N number of laser module output connection N × 1
The input of photo-coupler, the outfan of N × 1 photo-coupler connect the first port of optical circulator, and Fabry-Perot grace swashs
Light device connects the second port of the optical circulator, and the 3rd port of the optical circulator connects the input of 1 × N photo-couplers
End, each outfan of 1 × N photo-couplers connect the input of electrooptic modulator, each electrooptic modulator by optical filter
Outfan be used for respective base station is connected by optical fiber.
2. light-carried wireless broadband system according to claim 1, it is characterised in that the laser module is by being sequentially connected
Tunable laser, Polarization Controller and adjustable optical attenuator constitute.
3. light-carried wireless broadband system according to claim 1, it is characterised in that the outfan of N × 1 photo-coupler
The first port that the optical circulator is connected by optoisolator.
4. light-carried wireless broadband system according to claim 1, it is characterised in that the Fabry-Perot grace laser instrument leads to
Cross the second port that adjustable optical attenuator connects the optical circulator.
5. light-carried wireless broadband system according to claim 1, it is characterised in that the base station includes the light being sequentially connected
Electric explorer, radio frequency amplifier and transmitting terminal antenna, each electrooptic modulator connect corresponding photodetector by optical fiber.
6. light-carried wireless broadband system according to claim 1, it is characterised in that each electrooptic modulator is loaded with base band number
Word information.
7. light-carried wireless broadband system according to claim 1, it is characterised in that the length range of the optical fiber is 1km
～50km.
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| CN201610947102.3A CN106506087B (en) | 2016-10-26 | 2016-10-26 | A kind of light-carried wireless broadband system |
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| CN201610947102.3A CN106506087B (en) | 2016-10-26 | 2016-10-26 | A kind of light-carried wireless broadband system |
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Cited By (3)
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| CN108521300A (en) * | 2018-06-06 | 2018-09-11 | 东莞理工学院 | A kind of light-carried wireless radio frequency signal generating device and method |
| CN109743107A (en) * | 2019-03-13 | 2019-05-10 | 苏州大学 | A kind of orthogonal frequency division multiplexing free-space optical communication system based on wavelet transformation |
| CN117254861A (en) * | 2023-10-08 | 2023-12-19 | 鸿基无线通信(深圳)有限公司 | Optical antenna, power transmission system and power transmission equipment |
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| CN108521300A (en) * | 2018-06-06 | 2018-09-11 | 东莞理工学院 | A kind of light-carried wireless radio frequency signal generating device and method |
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| CN109743107A (en) * | 2019-03-13 | 2019-05-10 | 苏州大学 | A kind of orthogonal frequency division multiplexing free-space optical communication system based on wavelet transformation |
| CN117254861A (en) * | 2023-10-08 | 2023-12-19 | 鸿基无线通信(深圳)有限公司 | Optical antenna, power transmission system and power transmission equipment |
| CN117254861B (en) * | 2023-10-08 | 2024-05-24 | 鸿基无线通信(深圳)有限公司 | Optical antenna, power transmission system and power transmission equipment |
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