CN101145845B - Full duplex optical fiber radio communication base station without light source and modulator - Google Patents
Full duplex optical fiber radio communication base station without light source and modulator Download PDFInfo
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- CN101145845B CN101145845B CN2006100322528A CN200610032252A CN101145845B CN 101145845 B CN101145845 B CN 101145845B CN 2006100322528 A CN2006100322528 A CN 2006100322528A CN 200610032252 A CN200610032252 A CN 200610032252A CN 101145845 B CN101145845 B CN 101145845B
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- optical
- millimeter wave
- base station
- light
- radio communication
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Abstract
The invention discloses a base station and a system capable of providing full-duplex Radio-on-fiber (ROF) communication, belonging to the ROF communication technology field. An uplink of the base station utilizes the optical carrier of a downlink, which saves light source. An uplink signal is modulated and amplified onto the optical carrier by a semiconductor optical amplifier, which integrates the functions of the optical modulator and the optical amplifier and saves the quantity of optical components. In addition, the invention also provides a ROF communication system realizing the full-duplex communication function. The base station and the system of the full-duplex ROF communication described by the invention reduce the quantity of the optical components and save the cost of the system as well.
Description
(1) technical field
The invention belongs to hybrid fiber-radio communication (Radio-over-Fiber is abbreviated as ROF) communication system technical field.
(2) background technology
Because the radio communication that increases is to the requirement of bandwidth fast, the 4th generation wireless access system will extend to millimere-wave band, in order to overcome for example restriction of transmission range aspect of radio communication, satisfy broadband requirement in the radio communication, need set up with existing broadband cabled communication network and get in touch.Optical fiber-wireless system (Radio-Over-Fiber abbreviates ROF as) will become the most promising technology of broadband wireless access that solves.The enormous bandwidth that the ROF system makes full use of optical fiber to be reducing cost and the flexibility of the combining wireless communication technology, will be wireless and the optical-fiber network fusion become and a kind ofly can increase Access Network capacity and mobility, the novel access network that can cut operating costs again.The basic thought of ROF system is the signal processing unit centering station with complexity, (Central Station is abbreviated as CS), and base station (Base Station is abbreviated as BS) only comprises the receiving device of cheap and simple.The signal processing unit at each base station Sharing Center station has reduced expensive signal processing unit quantity, thereby has simplified the complexity and the structure of base station.
Because millimeter wave transmission range in atmosphere is short, realize the covering fully of signal, the machine station distribution certainly will be very close, therefore, base station simple in structure, low-cost millimetre-wave attenuator just become optical fiber radio communication system the critical problem that must solve.
The major function of ROF base station is to receive the down link optical millimeter wave signal that comes from central station, carry out becoming electric millimeter-wave signal after the opto-electronic conversion, and launch by antenna, receive the data message of the up link come from client's portable terminal simultaneously, and be modulated into light signal and send to central station and handle.The ROF system base-station of being developed at present, oneself has proposed light carrier with down link and has put forward light carrier as up link, need not use laser like this in the base station, still, the modulation of uplink data must be used an optical modulator, and such base station still is not the simplest.
In order to address the above problem, our scheme adopts semiconductor optical amplifier to come the data message of modulates uplink, simultaneously, also light signal is amplified.Reduced the cost of base station like this, made the simple in structure of base station, realized easily and low price.
(3) summary of the invention
The present invention is directed to above-mentioned situation, solved the simplification architecture of base station, reduce the problem of base station cost.In the base station, do not use any light source and optical modulator, light source and modulator are concentrated on central station, make architecture of base station simple, simultaneously, a kind of corresponding full-duplex communication ROF system configuration has also been proposed, in up link, utilize the light carrier of up link, simplified the structure of system, reduced the cost of system.
In order to achieve the above object, concrete scheme of the present invention is as follows:
Utilize the light filtering mode that the light carrier of down link is extracted, enter semiconductor optical amplifier (SOA), the data-signal that comes from the up link of client drives semiconductor optical amplifier, the signal of down link is modulated on the light carrier, amplify simultaneously, the Optical Fiber Transmission by up link is to central station.
Described full duplex fibre-optical radio communication base station such as Fig. 1 comprise:
The light annular device, the optical millimeter wave and the light carrier that are used for coming from the down link of central station separate; Fiber grating is used to reflect the carrier wave that down link sends, and allows optical millimeter wave pass through; Image intensifer is used to amplify optical millimeter wave; Optical band pass filter is used to filter the high frequency sideband; Photodetector is used for optical millimeter wave is converted into electric millimeter wave; The radio frequency electric amplifier is used for electric millimeter wave is amplified; Radio-frequency antenna is used for millimeter wave is emitted to atmosphere.Semiconductor optical amplifier is used for uplink signal is modulated to light carrier, and amplifies.
Described full duplex fibre-optical radio communication base station is characterized in that comprising following job step:
In down link, the optical millimeter wave that will come from down link with the light filtering mode is separated with light carrier; The optical millimeter wave that separates carries out filtering after amplifying by image intensifer again; Filtered optical millimeter wave is sent in the atmosphere by radio-frequency antenna;
In up link, make the light carrier of the down link that obtains with the light filtering mode, enter semiconductor optical amplifier with this light carrier as up link, the uplink data signals that comes from client drives semiconductor optical amplifier, light carrier is modulated, light signal ripple after the modulation is sent in the optical fiber of up link, and delivers to central station.
Smooth filtering mode of the present invention is to realize by light annular device and fiber grating, and its principle is that optical millimeter wave and light carrier by after the light annular device, export fiber grating earlier to, fiber grating reverberation carrier wave, and transmitted light millimeter wave together.Optical millimeter wave is exported from fiber grating, and light carrier has been realized light carrier is separated with optical millimeter wave from another port output of light annular device like this.This function also can realize by light cross-utilization device.
The present invention also provides a kind of system that utilizes base station of the present invention to carry out full duplex fibre-optical radio communication, as shown in Figure 2.Mainly comprise:
Described central station comprises light source 11, phase modulated 12, radio frequency sine-wave generator 13, light intersection multiplexer 14, erbium-doped fiber amplifier 15, light intensity modulator 16, base-band data signal source 17, luminous power coupler 18, and up-link receiver 19.
Described central station is characterized in that comprising the following course of work:
The light carrier that produces assigned frequency by light source 11 enters optical phase modulator 12, be subjected to the driving of the radiofrequency signal of radio frequency sine-wave generator 13 generations, thereby produce the signal of double-sideband modulation, by light intersection multiplexer 14 the center light carrier wave is effectively separated with the single order sideband again, after single order bimodulus sideband signals after the separation amplifies by image intensifer 15, entering light intensity modulator 16 again is modulated to baseband signal on the bimodulus sideband, produce the optical millimeter wave signal, the optical millimeter wave signal enters optical coupler 18 and comes from light and intersect the light carrier of multiplexer 14 and be coupled and send to downlink transmission optical fiber 21, transfers to base station 10.The optical receiver 19 of central station 20 receives the uplink signal that comes from the base station, sends by ul transmissions optical fiber 22.
The present invention utilizes the light filtering mode to realize the up link Wavelength reuse, save photonic device, and utilized semiconductor optical amplifier that uplink data information is modulated on the light carrier, and amplify simultaneously, make that the architecture of base station of ROF system is simple, be easy to realize.
(4) description of drawings
Fig. 1 is a basic station structure schematic diagram of the present invention.
The full duplex fibre-optical radio communication system schematic diagram that Fig. 2 constitutes for base station of the present invention;
Among the figure:
1-light annular device
The 2-fiber grating
The 3-image intensifer
The 4-optical band pass filter
5-photodetector
6-radio frequency electric amplifier
7-RF antenna
8-semiconductor optical amplifier
9-uplink data signals
The 10-base station
The 11-light source
12-optical phase modulator
13-radio frequency sine-wave generator
14-light intersection multiplexer
15-image intensifer
The 16-light intensity modulator
17-base-band data signal source
18-luminous power coupler
19-optical receiver
20-central station
21-downlink transmission optical fiber
22-ul transmissions optical fiber
(5) embodiment
Below in conjunction with concrete experimental example and accompanying drawing, the present invention is specified.
By shown in Figure 1, each parts of full duplex fibre-optical radio communication base station are respectively described below:
Light annular device 1, the optical millimeter wave and the light carrier that are used for coming from the down link of central station separate; Fiber grating 2 is used to reflect the carrier wave that down link sends, and allows optical millimeter wave pass through; Image intensifer 3 is used to amplify optical millimeter wave; Optical band pass filter 4 is used to filter the high frequency sideband; Photodetector 5 is used for optical millimeter wave is converted into electric millimeter wave; Radio frequency electric amplifier 6 is used for electric millimeter wave is amplified; Radio-frequency antenna 7 is used for millimeter wave is emitted to atmosphere.Semiconductor optical amplifier 8 is used for uplink signal 9 is modulated to light carrier, and amplifies simultaneously.
The light annular device in the present embodiment in the full duplex fibre-optical radio communication base station and the function of fiber grating also can adopt light cross-utilization device to realize.Image intensifer 3 is an erbium-doped fiber amplifier, also can be other image intensifer.
The full duplex fibre-optical radio communication system that is made of base station of the present invention as shown in Figure 2.
Described full duplex fibre-optical radio communication system comprises central station 20, base station 10 and Transmission Fibers 21,22.
Central station of the present invention, main effect is the data-signal that produces down link optical millimeter wave and receiving downlink.
The concrete connected mode of described full duplex fibre-optical radio communication system is as follows:
In the down link, light source 11 is used to produce the single longitudinal mode laser of specified wavelength, links to each other with the light incoming end of optical phase modulator 12, the electric incoming end of optical phase modulator 12 links to each other with the output of radio frequency sine-wave generator 13, the frequency of radio-frequency signal source can for 1～30GHz and more than.Phase-modulator 12 outputs and light intersect the input of multiplexer 14 and link to each other, one of light intersection multiplexer 14 outputs are connected with erbium-doped fiber amplifier 15, the output of erbium-doped fiber amplifier 15 links to each other with the light input end of light intensity modulator 16, the electrical input of light intensity modulator 16 links to each other with base-band data signal source 17, and the output of light intensity modulator 16 links to each other with the input of luminous power coupler 18; Another output of light intersection multiplexer 14 directly links to each other with luminous power coupler 18; The output of luminous power coupler 18 is exported millimeter wave, and links to each other with downlink transmission optical fiber 21.The input of the light annular device 1 in Transmission Fibers 21 and the base station 10 links to each other, and Transmission Fibers is monomode fiber SMF-28.
In the up link, receive the light carrier that comes from light annular device 1, and link to each other, the data signal modulation of up link to light carrier, and is exported the up link light signal with uplink data signals 9 from client by the semiconductor optical amplifier in the base station 8.The output of semiconductor optical amplifier 8 links to each other with ul transmissions optical fiber 22, by Transmission Fibers 22 receiver 19 that the up link light signal is sent to up link is detected.
The frequency of the optical millimeter wave that described central station produces is 2 times of frequency of the radiofrequency signal that produces of radio frequency sine-wave generator 13.
The optical millimeter wave of the central station of described full duplex fibre-optical radio communication system also can be produced by alternate manner.
Described base station among the present invention is suitable for the WDM Optical Fiber Transmission wireless signal that frequency is 1～40GHZ and other frequency.
The present invention adopts the light filtering mode to obtain the light carrier of down link, and by semiconductor optical amplifier with the data signal modulation of up link to light carrier, need not to use light source, make that architecture of base station is simple, high stability and low cost.
In a word, advantage of the present invention is to reduce the cost of optical fiber radio communication system, so that the ROF entire system is simple in structure, reduces the quantity of employed components and parts as far as possible, and stable performance realizes easily.
Claims (5)
1. full duplex fibre-optical radio communication base station, the optical millimeter wave and the light carrier that are used for receiving downlink, convert optical millimeter wave to electric millimeter wave and be transmitted in the atmosphere, signal with up link is modulated to from the next light carrier of down link on the other hand, it is characterized in that described base station comprises:
The light annular device, the optical millimeter wave and the light carrier that are used for coming from the down link of central station separate; Fiber grating is used to reflect the light carrier that described down link sends, and allows optical millimeter wave pass through; Image intensifer is used to amplify described optical millimeter wave; Optical band pass filter is used to filter the high frequency sideband; Photodetector is used for described optical millimeter wave is converted into electric millimeter wave; The radio frequency electric amplifier is used for described electric millimeter wave is amplified; Radio-frequency antenna is used for described electric millimeter wave is emitted to atmosphere; Semiconductor optical amplifier is used for uplink signal is modulated to light carrier, and amplifies.
2. base station according to claim 1 is characterized in that: adopted the light filtering mode that the optical millimeter wave of down link is separated with light carrier.
3. a full duplex fibre-optical radio communication system is characterized in that utilizing base station as claimed in claim 1 or 2 to carry out full-duplex communication.
4. full duplex fibre-optical radio communication system according to claim 3 is characterized in that comprising central station and described base station.
5. full duplex fibre-optical radio communication system according to claim 4 is characterized in that its central station produces optical millimeter wave and light carrier, is sent to described base station simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100322528A CN101145845B (en) | 2006-09-14 | 2006-09-14 | Full duplex optical fiber radio communication base station without light source and modulator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2006100322528A CN101145845B (en) | 2006-09-14 | 2006-09-14 | Full duplex optical fiber radio communication base station without light source and modulator |
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| CN101145845A CN101145845A (en) | 2008-03-19 |
| CN101145845B true CN101145845B (en) | 2011-08-03 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102325122B (en) * | 2011-10-20 | 2013-09-25 | 电子科技大学 | Two-way passive optical network system based on OFDM-ROF (Orthogonal Frequency Division Multiplexing-Radio Over Fiber) |
| CN112148243B (en) * | 2020-09-29 | 2021-11-09 | 四川易数无限科技有限公司 | Wireless point light source positioning system and method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1479479A (en) * | 2003-07-29 | 2004-03-03 | 北京大学 | Wave division complex mm wave light source row and corresponding optical fiber transmission radio signal communiation sysem |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1479479A (en) * | 2003-07-29 | 2004-03-03 | 北京大学 | Wave division complex mm wave light source row and corresponding optical fiber transmission radio signal communiation sysem |
Non-Patent Citations (1)
| Title |
|---|
| Jianjun Yu等.Seamless Integration of an 8×25 Gb/s WDM-PON and Radio-Over-Fiber Using ALL-Optcial Up-Conversion Based on Raman-Assisted FWM.《IEEE PHOTONICS TECHNOLOGY LETTERS》.2005,第17卷(第9期),1986-1988. * |
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