CN101090299A - Method and system for synchronous generating radio and wire signal using double-arm modulator - Google Patents

Method and system for synchronous generating radio and wire signal using double-arm modulator Download PDF

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Publication number
CN101090299A
CN101090299A CNA2007100349582A CN200710034958A CN101090299A CN 101090299 A CN101090299 A CN 101090299A CN A2007100349582 A CNA2007100349582 A CN A2007100349582A CN 200710034958 A CN200710034958 A CN 200710034958A CN 101090299 A CN101090299 A CN 101090299A
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signal
wireless
double
modulator
subcarrier
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余建军
陈林
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Hunan University
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Hunan University
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Abstract

This invention discloses a method for generating radio signals and wire baseband at the same time by a double-arm modulator and a single-wavelength light source in a radio-on-fiber(ROF) communicastion system and a system for transmitting two kinds of signals simultaneously on a same wavelength by fiber, which utilizes a dual-webbing modulation and a optical filter theory to generate dual-webbing signals and filter ROF mm waves and baseband data signals from down link to be provided to different users, and this invented system is not only used in single-channel ROF system but also used in WDM ROF system.

Description

Adopt double-arm modulator to produce wireless simultaneously and method and system wire signal
(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 can be provided simultaneously.
(2) background technology
Wireless penetration and broadband be the focus of current communication industry and even whole information industry.Current information-intensive society is more and more urgent to the demand that comprises multimedia communications such as sound, data and image, and people wish can be at any time to provide these communication services to individual's (no matter this people somewhere).Radio communication makes people to communicate with anyone whenever and wherever possible, and broadband connections can be sent to data, the Internet, speech, video and multimedia application commerce and domestic consumer, and the two combination becomes the developing direction of communication undoubtedly.
But recent years, because a large amount of optical fiber of laying is not fully utilized, telecommunication service is long slow apart from the development speed aspect backbone network and the metropolitan area network.So along with the communication mode growth of requirement that the interactive multimedia service also can be provided ultrahigh speed, material benefit, wide-band mobile communication has attracted people to study interest greatly, and transworld user, government department, cable operator and telco service provider increase day by day to the concern of broadband access network.
For the enormous bandwidth that makes full use of optical fiber to reduce cost and the flexibility of the combining wireless communication technology, the fusion of wireless network and optical-fiber network is natural becomes a kind ofly can increase Access Network capacity and mobility, again the potential solution that can cut operating costs.Research work to Optical Fiber Transmission wireless signal (Radio-over-Fiber the is abbreviated as ROF) communication system of " removable vast capacity ultrahigh speed " more and more gives great concern in the world.The notion of ROF has merged two kinds of routine techniquess---wireless radio-frequency and optical fiber wire transmission technology.Optical fiber link provides the transmission of long distance, and the communication between terminal and the terminal use is finished by less radio-frequency.The ROF technology is fully in conjunction with the characteristics of optical fiber and high frequency radio wave transmission, energy is realized big capacity, radiofrequency signal wire transmission cheaply and is surpassed the super wideband wireless access of 1Gbit/s, and have broad covered area, be easy to characteristics such as dynamic management and maintenance, have great application prospect in fields such as future ubiquitous ultra broadband cellular network, indoor wireless local area network network, satellite communication, video distribution formula system, intelligent transportation communication and controls.
And Access Network of future generation is devoted to provide wired and wireless dual service, use a kind of lower-cost method in the ultrahigh speed broadband, for user terminal provides more more options, more various, service easily.These directions that make that all the ROF system will increase towards capacity, bandwidth increases, mobility strengthens and reduce cost develop, and want to serve fixed terminal and portable terminal simultaneously.
At present, propose some full photomixing or gone up the technology of changing millimeter-wave signal, as: utilize cross-phase modulation (the XPM) [Z.Jia in the high speed nonlinear optical fiber (HNLF), et al., " All-Optical 16 * 2.5Gb/s WDM Signal Simultaneous Up-Conversion Based on XPM in an NOLMin ROF System ", IEEE PHOTONICS TECHNOLOGY LETTERS, VOL.17, NO.12, DECEMBER2005, Page (s): 2724-2726]; Utilize the intersection in the electroabsorption modulator (EAM) to absorb modulation (XAM) [J.Yu, et al. " All-Optical Mixer Based onCross-Absorption Modulation in Electroabsorption Modulator ", IEEE PHOTONICSTECHNOLOGY LETTERS, VOL.17, NO.11, NOVEMBER2005, Page (s): 2421-2423]; Or suppress (OCS) with the light carrier of external modulator.Above-mentioned these methods have all generated two same data-signals simultaneously: one in electric base band, and another is at the RF carrier frequency.Yet these schemes all or require that high input optical power is arranged or need accurate biasing control, and need the modulator of cascade just can finish modulation and up-conversion to baseband signal, and this just increases the cost and the complexity of system to a great extent.
In order to address the above problem, our scheme only adopts the light source of a both arms intensity modulator and a single 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 the wireless light carrier millimeter signal of above method generation and wired baseband signal to be sent to the base station simultaneously, handles wireless signal and wire signal in the base station respectively.
(3) summary of the invention
The present invention is directed to above-mentioned situation,, only generate wired and wireless signal with transmitting high speed simultaneously, independently wired and wireless service are provided with the intensity modulator of both arms with a kind of ROF scheme of novelty.Thereby reduced the cost and the complexity of system, with simple, a feasible system with this hybrid-type smooth wireless system successful application in the network of reality, make system configuration simple, reduce the cost of system.
In order to achieve the above object, concrete scheme of the present invention is as follows:
At central station, wireless signal carries out up-conversion by subcarrier multiplexed (SCM) and is downloaded on the subcarrier, and simultaneously, wire signal is downloaded on the original light carrier by intensity modulated.In the base station, the Signal Separation that will come in an intersection multiplexer becomes two parts, then wireless, wire signal is handled respectively.
Described central station produces simultaneously and transmits scheme wireless, wire signal, it is characterized in that comprising the following course of work:
Use continuous-wave laser to produce light carrier;
Wireless signal carries out up-conversion by subcarrier multiplexed (SCM) and is loaded on the subcarrier, is input to an actuating arm of both arms intensity modulator then;
Wire signal is as another actuating arm of another drive signal input double-arm modulator;
Optical carrier enters intensity modulator and produces double-side band (DSB) modulation signal.
Compare with some schemes that proposed, the present invention does not need coupler and light intersection multiplexer to come separate carrier and subcarrier to realize the cascade modulation, and this is very big raising on the feasibility of power budget and system.
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 is used for the separating of wireless and wire signal of the down link that will receive; The optical receiver of two down links, mainly finish light signal is become the signal of telecommunication, one of them optical receiver at a high speed, the single order sideband signals is become the millimeter wave signal of telecommunication, the optical receiver of a low speed, mainly finish the wire signal that baseband signal is become electricity, the user can detect wire signal with a common receiver; An antenna, its effect are that wireless signal transmission with down link is to 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 separately becomes 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 also provides a kind of and has generated wireless simultaneously and system wire signal.Station, described system branch center and base station two parts.
Generating wireless, wire signal module in the central station simultaneously comprises:
Laser is used to produce the single longitudinal mode light signal of specified wavelength; The both arms intensity modulator is used for wire signal is carried out intensity modulated; Radio-frequency signal source is used to produce the radio frequency sine wave signal; The wireless data signal source is used to produce wireless data signal; Frequency mixer is used for wireless data signal and radio frequency sine wave signal are carried out mixing, realizes sub-carrier modulation.
Generate simultaneously in the central station and transmit wireless, wire signal module and it is characterized in that comprising the following course of work:
Single longitudinal mode optical carrier by continuous-wave laser produces enters modulator and is modulated.Wireless signal and a sinusoidal wave mixed frequency carry out up-conversion, realize the subcarrier multiplexing of wireless signal, and then are used for an electrode of driven modulator.Another electrode of modulator is by the wire signal data-driven, and wire signal carries out intensity modulated in modulator.After ovennodulation, optical millimeter wave carries simultaneously, and optical fiber link wireless, that wire signal together enters down link transfers to the base station.
The base station comprises: optical filter, high speed optoelectronic detector and low speed photoelectric detector.
The present invention utilizes double-arm modulator to carry out double-sideband modulation, has reduced input optical power, has also reduced the cost of system simultaneously.
(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 wireless and wire signal transmission system schematic diagram of the present invention;
Fig. 4 is a customer mobile terminal receiver schematic diagram of the present invention;
Fig. 5 is the error rate figure and the eye pattern of the wireless signal of embodiment of the invention generation;
Fig. 6 is the error rate figure and the eye pattern of the wire signal of embodiment of the invention generation.
Among the figure:
The 1-continuous wave light source
2-both arms intensity modulator
The 3-radio-frequency signal source
The 4-frequency mixer
5-cable data signal
55-wireless data signal source
6-optical fiber
The 7-optical filter
8-wireless signal detection module
9-wire signal detection module
10-arrowband electric amplifier
The 11-transmitting antenna
The 12-central station
The 13-base station
The 14-reception antenna
The 15-frequency mixer
(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 12 are respectively described below:
Laser 1 is used to produce the single longitudinal mode light signal of specified wavelength, can be DFB-LD; Both arms light intensity modulator 2 is used to produce the double-sideband modulation signal, can be lithium niobate (LiNbO 3) modulator.Two drive signals of the sub-modulator 2 of present embodiment: one is the data-signal of cable data signal source 5 generations of 10Gb/s, another is wireless data signal and the mixing of radio frequency sinusoidal signal that is produced by wireless data signal source 55, carry out up-conversion and be downloaded on the subcarrier, and then be used for driven modulator 2.Frequency mixer 4 is used for mixing wireless data signal and radio frequency sine wave signal, and wireless signal is carried out up-conversion.
By shown in Figure 2, the each several part of base station 13 is respectively described below:
Optical filter 7, its effect is that wireless signal in the double-sideband signal and wire signal are separated, being about to light carrier separates with subcarrier, the frequency interval of its two output port is decided according to the frequency of carrier wave and double-side band, optical filter can make up with light annular device and fiber grating, it also can be optical interleaver, present embodiment is the optical interleaver of 50/25GHz for the input and output frequency interval, then wireless signal and wire signal can be separated, respectively wired and wireless signal be handled as required then.Wireless signal detection module 8, be used for earlier the wireless signal of separating being carried out light-to-current inversion, the PIN photodiode of available 60GHz bandwidth directly detects in the present embodiment, electric millimeter-wave signal after the conversion amplifies by the electric amplifier 10 of arrowband, be that the arrowband electric amplifier (EA) of 10GHz amplifies with a centered carrier for the 40GHz bandwidth in the present embodiment, launch by antenna 11.In wire signal detection module 9, wire signal is directly inserted by optical fiber, the receiver of the 10Gb/s by the 3R regeneration function.
Among the present invention, do not need coupler and light intersection multiplexer to come separate carrier and subcarrier to realize the cascade modulation at central station, only generate wired and wireless signal with transmitting high speed simultaneously with the intensity modulator of both arms, independently wired and wireless service can not only be provided simultaneously, and make that central station is simple in structure, high stability and low cost.
Fig. 3 is a transmission system schematic diagram of the present invention, and the double-sideband signal of being carried millimeter wave and 12 generations of baseband signal generation module by light is sent to base station 13 by Transmission Fibers 6, 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 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 11 by its reception antenna 14, and is undertaken behind the self-mixing wireless data signal being carried out demodulation by frequency mixer 15.
Fig. 5 has shown the relation of the error rate BER and the received optical power of the wireless signal that measures in the present embodiment.Back-to-back with the eye pattern of transmission behind the 20km.
Fig. 6 has shown the relation of the error rate BER and the received optical power of the wire signal that measures in the present embodiment.Back-to-back with the electric eye figure of transmission behind the 20km.
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, utilized double-arm 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 the modulator of a bipolar electrode, 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, transmitting two paths of signals simultaneously, 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, the cost that has yet reduced.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 provide simultaneously wired and wireless dual service with lower cost, And so that whole ROF system architecture is simple.

Claims (4)

1, a kind of method that produces wireless signal and wire signal simultaneously is characterized in that described method may further comprise the steps:
Use continuous-wave laser to produce light carrier;
Use double-arm modulator to produce double-sideband signal;
Wireless signal carries out up-conversion by subcarrier multiplexed (SCM) and is downloaded on the subcarrier, is input to an actuating arm of both arms intensity modulator then;
Wire signal is as another actuating arm of another drive signal input double-arm modulator;
Optical carrier enters modulator and carries out intensity modulated generation double-side band (DSB) modulation signal, and wire signal is downloaded on the light carrier, and wireless signal is on subcarrier.
2, according to right 1 described method, it is characterized in that: adopted subcarrier multiplexing.
3, in the base station with transmit simultaneously wireless and method that wire signal is separated, it is characterized in that using up and intersect multiplexer separately light carrier and subcarrier, obtain wire signal and wireless signal, respectively two kinds of signals are carried out different processing again.
4, a kind of optical fiber radio communication system is characterised in that: adopted the whole bag of tricks described in the right 1-3.
CNA2007100349582A 2007-05-21 2007-05-21 Method and system for synchronous generating radio and wire signal using double-arm modulator Pending CN101090299A (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101777953B (en) * 2010-01-08 2012-10-24 西安电子科技大学 Light double-sideband modulation device and method for transmitting two paths of signals
CN105577282A (en) * 2010-05-02 2016-05-11 康宁光缆系统有限责任公司 Providing digital data services in optical fiber-based distributed radio frequency (rf) communications systems
US9813164B2 (en) 2011-02-21 2017-11-07 Corning Optical Communications LLC Providing digital data services as electrical signals and radio-frequency (RF) communications over optical fiber in distributed communications systems, and related components and methods
US9853732B2 (en) 2010-05-02 2017-12-26 Corning Optical Communications LLC Digital data services and/or power distribution in optical fiber-based distributed communications systems providing digital data and radio frequency (RF) communications services, and related components and methods
US10014944B2 (en) 2010-08-16 2018-07-03 Corning Optical Communications LLC Remote antenna clusters and related systems, components, and methods supporting digital data signal propagation between remote antenna units
US10096909B2 (en) 2014-11-03 2018-10-09 Corning Optical Communications Wireless Ltd. Multi-band monopole planar antennas configured to facilitate improved radio frequency (RF) isolation in multiple-input multiple-output (MIMO) antenna arrangement
US10110308B2 (en) 2014-12-18 2018-10-23 Corning Optical Communications Wireless Ltd Digital interface modules (DIMs) for flexibly distributing digital and/or analog communications signals in wide-area analog distributed antenna systems (DASs)
US10135533B2 (en) 2014-11-13 2018-11-20 Corning Optical Communications Wireless Ltd Analog distributed antenna systems (DASS) supporting distribution of digital communications signals interfaced from a digital signal source and analog radio frequency (RF) communications signals
US10187151B2 (en) 2014-12-18 2019-01-22 Corning Optical Communications Wireless Ltd Digital-analog interface modules (DAIMs) for flexibly distributing digital and/or analog communications signals in wide-area analog distributed antenna systems (DASs)
US10659163B2 (en) 2014-09-25 2020-05-19 Corning Optical Communications LLC Supporting analog remote antenna units (RAUs) in digital distributed antenna systems (DASs) using analog RAU digital adaptors
CN111769890A (en) * 2020-06-23 2020-10-13 黄骅市交大思诺科技有限公司 Transponder production detecting system

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101777953B (en) * 2010-01-08 2012-10-24 西安电子科技大学 Light double-sideband modulation device and method for transmitting two paths of signals
CN105577282A (en) * 2010-05-02 2016-05-11 康宁光缆系统有限责任公司 Providing digital data services in optical fiber-based distributed radio frequency (rf) communications systems
US9853732B2 (en) 2010-05-02 2017-12-26 Corning Optical Communications LLC Digital data services and/or power distribution in optical fiber-based distributed communications systems providing digital data and radio frequency (RF) communications services, and related components and methods
CN105577282B (en) * 2010-05-02 2018-09-18 康宁光缆系统有限责任公司 In the distributed radio frequency based on optical fiber（RF）Digital data service is provided in communication system
US10014944B2 (en) 2010-08-16 2018-07-03 Corning Optical Communications LLC Remote antenna clusters and related systems, components, and methods supporting digital data signal propagation between remote antenna units
US10205538B2 (en) 2011-02-21 2019-02-12 Corning Optical Communications LLC Providing digital data services as electrical signals and radio-frequency (RF) communications over optical fiber in distributed communications systems, and related components and methods
US9813164B2 (en) 2011-02-21 2017-11-07 Corning Optical Communications LLC Providing digital data services as electrical signals and radio-frequency (RF) communications over optical fiber in distributed communications systems, and related components and methods
US10659163B2 (en) 2014-09-25 2020-05-19 Corning Optical Communications LLC Supporting analog remote antenna units (RAUs) in digital distributed antenna systems (DASs) using analog RAU digital adaptors
US10096909B2 (en) 2014-11-03 2018-10-09 Corning Optical Communications Wireless Ltd. Multi-band monopole planar antennas configured to facilitate improved radio frequency (RF) isolation in multiple-input multiple-output (MIMO) antenna arrangement
US10135533B2 (en) 2014-11-13 2018-11-20 Corning Optical Communications Wireless Ltd Analog distributed antenna systems (DASS) supporting distribution of digital communications signals interfaced from a digital signal source and analog radio frequency (RF) communications signals
US10523326B2 (en) 2014-11-13 2019-12-31 Corning Optical Communications LLC Analog distributed antenna systems (DASS) supporting distribution of digital communications signals interfaced from a digital signal source and analog radio frequency (RF) communications signals
US10187151B2 (en) 2014-12-18 2019-01-22 Corning Optical Communications Wireless Ltd Digital-analog interface modules (DAIMs) for flexibly distributing digital and/or analog communications signals in wide-area analog distributed antenna systems (DASs)
US10361783B2 (en) 2014-12-18 2019-07-23 Corning Optical Communications LLC Digital interface modules (DIMs) for flexibly distributing digital and/or analog communications signals in wide-area analog distributed antenna systems (DASs)
US10523327B2 (en) 2014-12-18 2019-12-31 Corning Optical Communications LLC Digital-analog interface modules (DAIMs) for flexibly distributing digital and/or analog communications signals in wide-area analog distributed antenna systems (DASs)
US10110308B2 (en) 2014-12-18 2018-10-23 Corning Optical Communications Wireless Ltd Digital interface modules (DIMs) for flexibly distributing digital and/or analog communications signals in wide-area analog distributed antenna systems (DASs)
CN111769890A (en) * 2020-06-23 2020-10-13 黄骅市交大思诺科技有限公司 Transponder production detecting system

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Application publication date: 20071219