CN101056147A - Method and system for generating the base band signals and radio signals with the single arm M-Z modulator - Google Patents
Method and system for generating the base band signals and radio signals with the single arm M-Z modulator Download PDFInfo
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- CN101056147A CN101056147A CNA2007100349597A CN200710034959A CN101056147A CN 101056147 A CN101056147 A CN 101056147A CN A2007100349597 A CNA2007100349597 A CN A2007100349597A CN 200710034959 A CN200710034959 A CN 200710034959A CN 101056147 A CN101056147 A CN 101056147A
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Abstract
The present invention discloses a method of generating wireless signal and wired baseband signal at the same time by adopting single-arm M-Z modulator and single wavelength light source in the field of radio-on-fiber (ROF) communication system technology, and a system transmitting two kinds of signals at the same time on a same wavelength through optical fiber. The present invention uses the principle of double-sideband modulation and optical filter and using the characteristics of the single arm M-X modulator generating double-sideband modulation which has a higher reliability and a low cost, and the device in the present invention has a simple structure and is easy to realize. The present invention adopts the principle of optical filter to filter the ROF millimeter wave and baseband data signals from the downlink for different users. The generating of the optical millimeter wave and baseband data signals in the present invention at the same time and the transmitting system can not only be used for single channel ROF system but also suitable for the wavelength division multiplex ROF system.
Description
(1) technical field
The invention belongs to optical fiber-wireless (Radio-over-Fiber is abbreviated as ROF) communication system technical field.Cable service and wireless service business are provided simultaneously.
(2) background technology
Radio Spectrum Resource is at full stretch at present, the frequency that is fit to mobile radio network has been cut apart in fact and has been finished, further develop other wireless new technologies, the frequency spectrum that strengthens prior art is more and more difficult, and we to the demand of information in continuous reinforcement, existing wireless technology is difficult to satisfy the requirement of people to bandwidth.The 4th generation wireless access system will extend to millimere-wave band.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, and wireless and fusion optical-fiber network are become a kind ofly can increase Access Network capacity and mobility, the novel access network that can cut operating costs again.The signal of the central station in the ROF system is sent to user terminal via the base station and is called down link, and the radiofrequency signal of mobile radio terminal is sent to central station via the base station and is called up link.At down link, from the signal loading of central station backbone network to optical fiber, and the descending base station that is sent to, after the detection to mobile radio terminal; In up link, (Radio-frequency RF) is carrying the data that come from terminal (End station: breviaty is ES) up being loaded on the optical fiber in back of encoding to less radio-frequency in the base station, and be sent to central station, and detection is to backbone network.
How the ROF system great majority of being studied have at present only studied transmitting wireless signals, and in order to realize organically blending of optical fiber and wireless technology, simultaneously transmitting wireless signals and wire signal.The existing article of delivering shows at present, and utilizing external modulator generation light to carry millimeter-wave signal is the most practical the simplest method, and light carries millimeter wave and is meant that the data-signal with the wireless user is loaded on the light carrier with radio-frequency carrier signal.Having proposed three kinds of different direct modulation schemes produces light and carries millimeter wave, as: double-sideband modulation (Double side-band, be abbreviated as DSB), monolateral band (Single side band, be abbreviated as SSB), and light carrier suppresses (Optical carrier suppression is abbreviated as OCS) technology.Wherein produce light and carry the bandwidth that the technical pattern of millimeter wave is simple, save electronic device and optical device based on light OCS modulation.
The generation of above-described optical millimeter wave, the light that has just produced wireless signal carries millimeter wave, and does not produce wired baseband signal.Will produce wired baseband signal simultaneously and wireless light carries millimeter-wave signal, in the existing scheme, must adopt two modulators, adopt the light source of two kinds of wavelength, so both increase the cost of system, the while spectrum efficiency is also low.
In order to address the above problem, our scheme only adopts the light source of a single armed Mai He-Zeng moral ear (M-Z) modulator and a wavelength, produces the baseband signal of cable service and the light of wireless service simultaneously and carries millimeter-wave signal.Central station need not a plurality of broad band electrooptic modulators like this; The present invention also provides a kind of optical fiber radio communication system, utilizes above method to produce that wireless light carries millimeter-wave signal and wired baseband signal is sent to the base station simultaneously, handles wireless signal and wire signal in the base station respectively.The present invention proposes the detection method of simple wireless signal and wire signal.
(3) summary of the invention
The present invention is directed to the problems referred to above, proposed to adopt a single armed modulator to produce base-band data signal and wireless signal simultaneously at central station, make system configuration simple, reduce the cost of system, also proposed a kind of simple base station simultaneously and received wire signal and wireless signal simultaneously.The objective of the invention is to produce wire signal and the quantity of the needed modulator of wireless signal and the quantity of light source in order to reduce.
In order to achieve the above object, concrete scheme of the present invention is as follows:
At central station, the light that adopts the DSB modulation technique to produce the wireless service of down link simultaneously carries the baseband signal of millimeter-wave signal and cable service; In the base station, respectively these two kinds of signals are detected reception.
Described central station comprises:
A continuous-wave laser is used to produce light carrier; A single electrode modulator is used to produce the double-sideband modulation signal; A frequency mixer, the mixing that is used for wireless data signal and radiofrequency signal produces rf wireless signal; An adder is used for the base-band data signal and the rf wireless signal of mixed cable service.
The generation scheme of described wireless and wire signal is characterized in that may further comprise the steps:
Wireless data signal and radio-frequency carrier signal carry out mixing;
Signal after the mixing is with the drive current of baseband signal as single arm M-Z modulator;
Use continuous-wave laser to produce light carrier;
Optical carrier enters the single electrode intensity modulator and drives generation double-sideband modulation signal simultaneously by RF signal and base-band data signal, and the single order sideband signals in the double-sideband signal carries wireless signal.And centered carrier carries the base-band data signal of cable service.
Described central station is characterized in that comprising the following course of work:
Wireless data signal and radio-frequency carrier signal carry out mixing; Signal after the mixing is with the drive current of baseband signal addition as single arm M-Z modulator, the continuous wave light carrier that laser is produced carries out double-sideband modulation, the single order sideband of the double-sideband signal that modulation produces comprises wireless data signal, and centered carrier carries the base-band data signal of cable service.
In order further to realize above-mentioned purpose, the present invention also provides the base station simple in structure that adapts with described central station.
Described base station comprises:
Optical filter, the wireless and wire signal that is used for the down link that will receive separates; The optical receiver of two down links is mainly finished light signal is become the signal of telecommunication, and one of them optical receiver at a high speed becomes the single order sideband signals into the millimeter wave signal of telecommunication, and the optical receiver of a low speed is mainly finished baseband signal is become the signal of telecommunication; An antenna, its effect are that the signal with down link is emitted in the air.
Base station simple in structure of the present invention, its course of work is as follows:
It is the single order sideband signals that the double-sideband signal that central station is produced is separated into two the tunnel, the one tunnel, forms light and carries millimeter-wave signal; Another road is a centered carrier, and its base-band data signal that carries cable service enters the low speed optical receiver and carries out envelope detected, recovers the cable data signal.The single order sideband signals enters photoelectric detector, produces electric millimeter wave, and electric millimeter wave is launched by antenna after amplifying through the high-frequency electrical amplifier, becomes radio signal.
The present invention utilizes single arm M-Z modulator to carry out double-sideband modulation, saves photonic device, has reduced the cost of system.
(4) description of drawings
Fig. 1 is the schematic diagram of central station of the present invention.
Fig. 2 realizes schematic diagram for base station of the present invention;
Fig. 3 is a transmission system schematic diagram of the present invention;
Fig. 4 is a customer mobile terminal receiver schematic diagram of the present invention
Among the figure:
The 1-continuous wave light source
The 2-single arm M-Z modulator
The 3-adder
The wired base-band data signal of 4-
The 5-frequency mixer
The 55-frequency mixer
The 6-wireless signal
The 7-radio-frequency signal source
The 8-Transmission Fibers
The 9-filter
10-high-speed light receiver O/E (opto-electronic conversion)
11-low speed optical receiver O/E (opto-electronic conversion)
The 12-narrow-band amplifier
13-light carries millimeter wave and baseband signal generation module
14-millimeter wave transmitting antenna
144-millimeter wave reception antenna
The 15-base station
(5) embodiment
Below in conjunction with concrete experimental example and accompanying drawing, the present invention is specified.
By shown in Figure 1, each parts that light carries millimeter wave and baseband signal generation module 13 are respectively described below:
Described light carries millimeter wave and the baseband signal generation module is characterized in that comprising the following course of work:
Single longitudinal mode optical carrier by continuous-wave laser 1 generation, enter single electrode M-Z modulator 2, when being subjected to wireless signal and baseband signal, modulates by single electrode M-Z modulator 2, wireless signal elder generation and radiofrequency signal mixing, signal after the mixing is mixed by an adder and base-band data signal again, make the single electrode modulator be subjected to the common modulation of base-band data signal and wireless signal, and be separate between these two kinds of signals, because they are from different signal sources.The light signal of modulation back output is the double-side band light signal, comprise center light carrier wave and two light single order sideband longitudinal mode compositions, what wherein light carrier mainly carried is base-band data signal, and two single order sideband longitudinal modes mainly carry wireless signal, forms light and carries millimeter-wave signal.Therefore carry millimeter wave by light and carry base-band data signal and wireless signal simultaneously with the double-sideband signal of baseband signal generation module 13 generations.
Fig. 2 is a base station of the present invention schematic diagram, and described base station comprises: filter 9, high speed optoelectronic detector 10, low speed photoelectric detector 11, narrow-band amplifier 12, antenna 14;
One of function of base station is light to be carried millimeter-wave signal become electric millimeter-wave signal and go out by antenna transmission, and the wireless access service is provided, and another function of base station is to detect baseband signal, and wired access service is provided.
The course of work of described base station is as follows:
Filter 9 carries centered carrier in the double-sideband signal that millimeter wave and baseband signal generation module 13 produce with light and carries millimeter-wave signal with light and separate. can intersect multiplexer or an optical filter realization filter function with a FBG or one at this, if we are with a FBG, wired access service end just can be with the photoelectric detector 11 of a low speed, detect the base-band data signal that reflects from FBG, the wireless access service end can be with the photoelectric detector 10 of a high speed, make two sidebands of light carrier millimeter-wave signal produce beat, light is carried millimeter-wave signal become electric millimeter wave, the electric millimeter-wave signal that is produced, its carrier frequency are two times of the radio frequency signal frequency that produced of radio-frequency signal source 7.The electricity millimeter-wave signal sends by antenna 14 through narrow-band amplifier 12 preposition amplifications again, uses for wireless access subscriber.And can directly use for wired access user from the base-band data signal that the photoelectric detector 11 of low speed detects.
Fig. 3 is a transmission system schematic diagram of the present invention, and the double-sideband signal of being carried millimeter wave and 13 generations of baseband signal generation module by light is sent to base station 15 by Transmission Fibers 8, in the base station wireless signal and wire signal is handled respectively.Wireless signal sends by millimeter wave antenna, provides wired access service and the photoelectric detector 11 of wire signal by low speed is transformed into the signal of telecommunication.
Fig. 4 is a customer mobile terminal receiver schematic diagram of the present invention, and the mobile subscriber receives the wireless signal that is sent by transmitting antenna 14 by its reception antenna 144, and is undertaken behind the self-mixing wireless data signal being carried out demodulation by frequency mixer 55.
Described method among the present invention and device are suitable for the WDM Optical Fiber Transmission wireless signal system that frequency is 1～40GHZ and other frequency.
The present invention utilizes double-sideband modulation principle and optical filter principle, has utilized single electrode MZ-MOD modulator to produce higher reliability and cheap characteristic that double-sideband signal had, and is simple in structure, be easy to realize.The present invention adopts the light filtering principle, leaches ROF millimeter wave and base-band data signal from down link, uses for different users.The configuration of our central station is also very simple like this, only use a single armed modulator, produce when just having realized baseband signal and wireless signal and transmission, in the downlink optical fiber transmission link, can be only with the light wave of a wavelength, the while transmitting two paths of signals, the spectral band width that takies like this, but the data of transmission are the twices under the square one, can solve the nervous problem of frequency spectrum resource to a certain extent. in this way, in the base station, do not need very complicated configuration yet, the base station is become simply, reduced cost yet.The present invention can adopt light to intersect multiplexer as optical filter, because light intersection multiplexer has periodic characteristic, if wavelength-division multiplex system, a plurality of wavelength can be shared an intersection multiplexer, therefore generation and transmission system not only can be used for single channel ROF system when optical millimeter wave of the present invention was with base-band data signal, were equally applicable to wavelength division multiplexing ROF system.
In a word, advantage of the present invention is to produce wireless and wired signal with lower cost, only uses one The light source of modulator and single wavelength has been simplified the structure of central station, has improved the availability of frequency spectrum, and performance is steady Fixed, realize easily.
Claims (3)
1, a kind of utilization produces wireless signal and wired baseband signaling methods simultaneously on single wavelength light carrier wave, be used to the down link of ROF system to produce the light to carry wireless data signal and carry millimeter wave, carry wired baseband signal simultaneously, it is characterized in that described method may further comprise the steps:
Use a single wavelength laser;
To mix with wired baseband signal again after wireless data signal and the mixing of radio frequency sine wave signal;
The mixed signal of wireless signal and wire signal drives single arm M-Z modulator, and wireless signal and wire signal be loaded into simultaneously carry out double-sideband modulation on the light carrier.
Modulator output double-sideband modulation signal;
The frequency spectrum of double-sideband signal comprises centered carrier and single order sideband; Wherein the single order sideband signals carries wireless data signal, and centered carrier carries wired base-band data signal.
The double-sideband modulation signal is sent to optical fiber link and is sent to the base station;
In the base station, adopt the method for filtering that single order sideband and centered carrier are separated, wherein the single order sideband forms light and carries millimeter wave, and become the electric millimeter-wave signal that carries wireless data by the high speed optoelectronic detector, and send by millimeter wave antenna, wireless service is provided.And directly obtaining electric baseband signal after by detection, centered carrier provides cable service.
2, according to right 1 described filtering method, can adopt devices such as optic tunable filter, optical interleaver and fiber grating to realize.
3, a kind of transmission system of wireless and wire signal, this system comprises:
Central station, comprise a radio frequency sine wave source, an electric frequency mixer, a single longitudinal mode laser, a wireless data signal source, wired base-band data signal source, its course of work is as follows: electric frequency mixer with the radio frequency sine wave signal with mix with wired base-band data signal by adder again after wireless data signal carries out mixing, drive single arm M-Z modulator output double-sideband signal.
The base station, it mainly acts on is that single order sideband signals in the double-sideband signal that central station is produced effectively separates with the light center carrier wave, the single order sideband signals that separation obtains enters the high speed optoelectronic detector and converts electric millimeter-wave signal to, and is emitted in the atmosphere by antenna; The centered carrier that separation obtains directly enters the low speed photoelectric detector and becomes electric baseband signal.
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| CNA2007100349597A CN101056147A (en) | 2007-05-21 | 2007-05-21 | Method and system for generating the base band signals and radio signals with the single arm M-Z modulator |
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| CNA2007100349597A CN101056147A (en) | 2007-05-21 | 2007-05-21 | Method and system for generating the base band signals and radio signals with the single arm M-Z modulator |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101339346B (en) * | 2008-08-14 | 2010-06-02 | 上海交通大学 | Device and method for full light generation for quadruple high speed millimeter wave signal |
| CN101321019B (en) * | 2008-07-03 | 2011-07-20 | 上海交通大学 | Multi-wavelength light source apparatus and method for generating accurate wavelength interval and high flatness |
| CN102412899A (en) * | 2011-11-21 | 2012-04-11 | 北京交通大学 | Polarization multiplexing millimeter-wave radio-over-fiber (RoF) system with high frequency spectrum utilization rate |
| CN111555812A (en) * | 2020-04-20 | 2020-08-18 | 复旦大学 | Device and system for simultaneously generating wired and wireless signals by adopting dual-polarization MZM modulator |
-
2007
- 2007-05-21 CN CNA2007100349597A patent/CN101056147A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101321019B (en) * | 2008-07-03 | 2011-07-20 | 上海交通大学 | Multi-wavelength light source apparatus and method for generating accurate wavelength interval and high flatness |
| CN101339346B (en) * | 2008-08-14 | 2010-06-02 | 上海交通大学 | Device and method for full light generation for quadruple high speed millimeter wave signal |
| CN102412899A (en) * | 2011-11-21 | 2012-04-11 | 北京交通大学 | Polarization multiplexing millimeter-wave radio-over-fiber (RoF) system with high frequency spectrum utilization rate |
| CN102412899B (en) * | 2011-11-21 | 2014-04-09 | 北京交通大学 | Polarization multiplexing millimeter-wave radio-over-fiber (RoF) system with high frequency spectrum utilization rate |
| CN111555812A (en) * | 2020-04-20 | 2020-08-18 | 复旦大学 | Device and system for simultaneously generating wired and wireless signals by adopting dual-polarization MZM modulator |
| CN111555812B (en) * | 2020-04-20 | 2023-03-28 | 复旦大学 | Device and system for simultaneously generating wired and wireless signals by adopting dual-polarization MZM modulator |
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Application publication date: 20071017 |