CN101807956B - Subway train-ground communication system applying ROF and fiber grating sensing - Google Patents
Subway train-ground communication system applying ROF and fiber grating sensing Download PDFInfo
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- CN101807956B CN101807956B CN2009102440293A CN200910244029A CN101807956B CN 101807956 B CN101807956 B CN 101807956B CN 2009102440293 A CN2009102440293 A CN 2009102440293A CN 200910244029 A CN200910244029 A CN 200910244029A CN 101807956 B CN101807956 B CN 101807956B
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Abstract
The invention discloses a subway train-ground communication system applying ROF (radio over fiber) and fiber grating sensing, relating to radio over fiber communication and sensing technology. The output of a double-wavelength light source (10) of a ground communication part is modulated, amplified, converted and separated by a light intensity modulator (11), a photoelectric detector (12), an erbium-doped fiber amplifier (20) and a duplexer (21) and then is transmitted respectively by a first transmitting antenna (50) and a second transmitting antenna (51). The signal received by a receiving antenna (52) of a train communication part and the intrinsic signal of a local oscillator (30) are mixed in a mixer (31), then are outputted and processed by a signal processor (32) to be connected with an SSG-DBR laser (40) and finally are respectively connected through an optical circulator (60) to a fiber grating sensor group (80) and a photoelectric converter (41) which is connected with a third transmitting antenna (53). The central station of the ROF system is combined with the ground station of the train-ground communication system, so the utilization ratio of the ground is improved.
Description
Technical field
The present invention relates to optical fiber radio communication, microwave photon technology, sensing technology and laser technique, be applicable to the fields such as land mobile communication system, microwave photon, Fibre Optical Sensor and optical fiber communication.
Background technology
ROF(Radio Over Fiber) technology is to replace in traditional wireless communication from central station (CS with optical fiber communication, Central Station) to base station (BS, Base Station) one section microwave transmission, central station is connected with a plurality of functions simple base stations by optical fiber.All processing capacities comprise that modulation /demodulation, encoding and decoding, route etc. complete at central station, and the major function of base station is to realize the conversion of light signal and microwave signal.At central station, base electrical signal is modulated on the millimeter wave that millimeter wave generator produces through electric modulator, then sends into optical modulator, with this compound electric signal be modulated to from millimeter wave generator obtain can be again with on light carrier, to be applicable to fibre channel transmission.Above these are all completed at central station.Microwave, millimeter-wave signal (RF signal) generation technique are the key technologies of ROF technology, present existing RF signal generation technique comprises direct modulation, external modulation and optical heterodyne method etc., and wherein light heterodyne method becomes with its excellent performance the effective ways that generation light carries the RF signal.The method produces a RF signal that carries baseband signal information, and two sideband signals that do not carry baseband signal information.
Fiber grating sensing technology be a kind of utilize fiber grating (Fiber Bragg Grating) transducer carry out sensing technology.Sensing process based on fiber-optic grating sensor is by extraneous physical parameter, heat transfer agent to be obtained in the modulation (drifting about as wavelength) of fiber grating Prague (Bragg) wavelength, be a kind of wavelength-modulated type Fibre Optical Sensor, can be made into Fibre Optical Sensor and optical fiber sensor network for detection of different kinds of parameters such as stress, strain, temperature, pressure, vibration, displacement, acceleration, inclination angles.
SSG-DBR laser (superstructure-grating distributed Bragg reflector lasers) is a kind ofly to change tuning wideband laser by bias current, tunable range can reach 103nm, peak intervals is about 10nm, and it is output as broad band laser.
Land mobile communication system refers to the Surveillance center that event and the critical data of onboard system monitoring in train travelling process is sent to ground in real time by wireless communication technology, for processing accordingly on ground, at the current run location of ground real time monitoring train, in time find accident potential, guarantee traffic safety, and provide communication service for the passenger in train.
The radio data communication mode that is applied at present in train-ground communication mainly contains: satellite GPS communication, GPRS communication, short message, GSM-R communication system.In these four kinds of modes, the GPS communication needs higher equipment cost, and GPRS need to take user's communication bandwidth, short message has higher propagation delay time, and GSM-R needs dedicated network, and the user outside network can't use, and has virtually reduced the utilization of resource.
Summary of the invention
To be solved by this invention is the problem that prior art exists, and proposes the subway train-ground communication system of a kind of applying ROF and optical fiber grating sensing.
The present invention is the technical scheme that its technical problem of solution adopts:
The subway train-ground communication system of a kind of applying ROF and optical fiber grating sensing, this subway train-ground communication system comprise, the ground communication part of subway train-ground communication system and the train communication part of subway train-ground communication system.
The ground communication of subway train-ground communication system partly comprises: double-wavelength light source, light intensity modulator, photodetector, Erbium-Doped Fiber Amplifier, duplexer, first, second transmitting antenna.
Connection between the device of the ground communication part of formation subway train-ground communication system:
Double-wavelength light source connects an end of light intensity modulator, and the other end of light intensity modulator connects the input of photodetector.
The output of photodetector connects the input of Erbium-Doped Fiber Amplifier, and the output of Erbium-Doped Fiber Amplifier connects the input of duplexer, and the first output of duplexer connects the first transmitting antenna, and the second output of duplexer connects the second transmitting antenna.
The train communication that consists of subway train-ground communication system partly comprises: reception antenna, local oscillator, frequency mixer, signal processor, SSG-DBR laser, fiber-optic grating sensor group, optical circulator, optical-electrical converter, the 3rd transmitting antenna.
Connection between the device of the train communication part of formation subway train-ground communication system:
An input of frequency mixer connects reception antenna, and another input of frequency mixer connects the output of local oscillator, and the output of frequency mixer connects the input of signal processor.
The output of signal processor connects the tuning current input of SSG-DBR laser, the output of SSG-DBR laser connects the first port of light annular device, the second port of optical circulator connects an end of fiber-optic grating sensor group, the 3rd port of light annular device connects the input of optical-electrical converter, and the output of optical-electrical converter connects the 3rd transmitting antenna.
Wherein the fiber-optic grating sensor group is by FBG
1, FBG
2FBG
10In any several formation, FBG of being connected in series
1, FBG
2FBG
10Centre wavelength all not identical.
Beneficial effect of the present invention is specific as follows:
The fiber grating manufacture craft is ripe, and cost is very low, uses fiber grating sensing system to detect train and respectively saves the compartment, does not need the compartment is transformed, and only the optical fiber of Fiber Bragg Grating need be laid on the place that is difficult for touching and get final product.Other sensor-based systems of comparing use fiber grating sensing system to increase transducing part under the prerequisite that does not change current subway system, and can original system not impacted.
The ROF technology has the transmission bandwidth of super large, is a kind of Remote Radio Technique.The simplification of base station makes the less equipment cost of cost, becomes possibility for the user provides large capacity, high-quality communication service.The present invention is when using the RF signal to provide communication service as the passenger, also utilized a sideband that does not carry base-band information that produces in the light heterodyne technology, by to this sideband frequency reducing, processing, make it to become the tuning source of SSG-DBR laser, the broad band laser of its output provides different wavelength for the different fiber grating in sensor-based system, original unemployed frequency resource is used, increased resource utilization.
The monitoring station of ground communication part need not special construction, reception, monitoring instrument are directly gathered the central station that arrives the ROF technology, make central station both can process signal of communication, can receive again the sensory feedback signal of train communication part, the railway car situation is monitored.Thereby do not need additionally to build the ground station in land mobile communication system, facilitate urban planning and increased the utilance of urban land resource.
Description of drawings
Fig. 1 is the ground communication part of subway train-ground communication system;
Fig. 2 is the train communication part of subway train-ground communication system.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
As Fig. 1, the ground communication part of the subway train-ground communication system of the subway train-ground communication system of a kind of applying ROF and optical fiber grating sensing, wherein being connected between each several part:
Double-wavelength light source 10 connects an end of light intensity modulator 11, and the other end of light intensity modulator 11 connects the input of photodetector 12.
The output of photodetector 12 connects the input of Erbium-Doped Fiber Amplifier 20, the output of Erbium-Doped Fiber Amplifier 20 connects the input of duplexer 21, the first output 211 of duplexer connects the first transmitting antenna 50, and the second output 212 of duplexer connects the second transmitting antenna 51.
As Fig. 2, the train communication part of the subway train-ground communication system of the subway train-ground communication system of a kind of applying ROF and optical fiber grating sensing, wherein being connected between each several part:
An input of frequency mixer 31 connects reception antenna 52, and another input of frequency mixer 31 connects the output of local oscillator 30, and the output of frequency mixer 31 connects the input of signal processor 32.
The output of signal processor 32 connects the tuning current input of SSG-DBR laser 40, and the output of SSG-DBR laser 40 connects the first port 601 of light annular device, and the second port 602 of optical circulator connects an end of fiber-optic grating sensor group 80.
The 3rd port 603 of light annular device connects the input of optical-electrical converter 41, and the output of optical-electrical converter 41 connects the 3rd transmitting antenna 53.
Fiber-optic grating sensor group 80 is by FBG
170, FBG
271 ... FBG
10Any several formation, wherein FBG of being connected in series in 79
170, FBG
271 ... FBG
1079 centre wavelength is all not identical, and this is determined by SSG-DBR laser 40 output wavelengths, is spaced apart about 10 nm.
Wherein: the central wavelength lambda 1=1491.7nm of FBG1;
The central wavelength lambda 2=1551. 6nm of FBG2;
……
The central wavelength lambda 10=1595.2nm of FBG10.
Lay an optical fiber on the subway carriage inner surface that is difficult for touching, be chosen according to the number of railway car and write FBG in optical fiber
170, FBG
271 ... FBG
10Any several fiber-optic grating sensor groups 80 that are connected to form in 79 have FBG at least in each compartment
170, FBG
271 ... FBG
10In 79 one is used for monitoring the situation in this compartment.
Also FBG can be arranged in each compartment
170, FBG
271 ... FBG
10Several in 79 increase the accuracy of sensor-based system with this.
Utilize the RF signal that produces in ROF equation of light method to provide communication service for the passenger, be used for the modulation signal of SSG-DBR laser after the intermediate-freuqncy signal (IF signal) that produces after one of sideband signals that produces and local oscillations source difference frequency is processed, the broad band laser of generation is as the light source of fiber grating sensing system.
Each device of the present invention is commercially available device.
The operation principle of the subway train-ground communication system of a kind of applying ROF and optical fiber grating sensing is as follows:
The two bundle frequency intervals that double-wavelength light source 10 produces are the 60GHz light wave, and wherein a branch of produces double-sideband signal after through intensity modulator 11 by frequency being the baseband signal modulation of 1.5GHz.Unmodulated light wave and modulated light wave produce the RF signal of a 60GHz who carries baseband signal information and the sideband signals that two frequencies are respectively 58.5GHz and 61.5 GHz at photodetector 12 places difference frequencies, after amplifying through Erbium-Doped Fiber Amplifier 20, duplexer 21 is separated the RF signal of 60GHz and the sideband signals of 61.5 GHz, wherein the RF signal of 60GHz is launched by the transmitting antenna 50 that is connected with the first output 211 of duplexer, for the passenger provides high-quality communication service.
61.5 the sideband signals of GHz is launched by the transmitting antenna 51 that is connected with the second output 212 of duplexer, received by reception antenna 52, the frequency that provides with local oscillator 30 is the local high-frequency oscillation signal of 60GHz difference frequency in frequency mixer 31, the low-frequency voltage signal of frequency mixer 31 outputs changes by signal processor 32 the tuning current input that current signal is input to SSG-DBR laser 40 into, makes it to export broad band laser.
Broad band laser enters in light annular device 60 by the first port 601 of light annular device, and then the second port 602 by the light annular device enters into fiber-optic grating sensor group 80, through FBG
170, FBG
271 ... FBG
10After 79 reflections, the second port 602 by the light annular device turns back in light annular device 60, output to optical-electrical converter 41 from the 3rd port 603 of light annular device 60, become wireless signal and turn back to ground central station by the 3rd transmitting antenna 53 through processing, the variation monitoring of the reverse wavelength by fiber grating respectively saves the situation in compartment.
Claims (2)
1. subway train-ground communication system of using light-carried wireless power technology ROF and optical fiber grating sensing is characterized by: this subway train-ground communication system comprises, the ground communication part of subway train-ground communication system and the train communication part of subway train-ground communication system;
Connection between the device of the ground communication part of formation subway train-ground communication system:
Double-wavelength light source (10) connects an end of light intensity modulator (11), and the other end of light intensity modulator (11) connects the input of photodetector (12);
The output of photodetector (12) connects the input of Erbium-Doped Fiber Amplifier (20), the output of Erbium-Doped Fiber Amplifier (20) connects the input of duplexer (21), first output (211) of duplexer connects the first transmitting antenna (50), and second output (212) of duplexer connects the second transmitting antenna (51);
Connection between the device of the train communication part of formation subway train-ground communication system:
An input of frequency mixer (31) connects reception antenna (52), and another input of frequency mixer (31) connects the output of local oscillator (30), and the output of frequency mixer (31) connects the input of signal processor (32);
The output of signal processor (32) connects the tuning current input of SSG-DBR laser (40), the output of SSG-DBR laser (40) connects first port (601) of light annular device, and second port (602) of optical circulator connects an end of fiber-optic grating sensor group (80);
The 3rd port (603) of light annular device connects the input of optical-electrical converter (41), and the output of optical-electrical converter (41) connects the 3rd transmitting antenna (53).
2. a kind of subway train-ground communication system of using light-carried wireless power technology ROF and optical fiber grating sensing according to claim 1, it is characterized by: described fiber-optic grating sensor group (80) is by optical fiber bragg grating FBG
1(70), FBG
2(71) ... FBG
10(79) any several formation, the wherein optical fiber bragg grating FBGs of being connected in series in
1(70), FBG
2(71) ... FBG
10(79) centre wavelength is all not identical.
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| CN104979744A (en) * | 2015-06-30 | 2015-10-14 | 西安电子科技大学 | Device for generating millimeter wave signals by using broadband light source |
| CN106850065B (en) * | 2017-01-21 | 2021-03-30 | 厦门宇昊软件有限公司 | Microwave photon temperature sensing system |
| CN110086552B (en) * | 2019-04-28 | 2021-11-05 | 深圳市万普拉斯科技有限公司 | Antenna combination equipment and mobile terminal |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101043274A (en) * | 2007-02-07 | 2007-09-26 | 湖南大学 | Modulator-free optical millimeter wave generating method and full-duplex optical fiber wireless communication system |
| CN101257352A (en) * | 2008-03-07 | 2008-09-03 | 北京大学 | ROF base station uplink of wavelength-division multiplex passive optical network and its system |
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| US7787823B2 (en) * | 2006-09-15 | 2010-08-31 | Corning Cable Systems Llc | Radio-over-fiber (RoF) optical fiber cable system with transponder diversity and RoF wireless picocellular system using same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101043274A (en) * | 2007-02-07 | 2007-09-26 | 湖南大学 | Modulator-free optical millimeter wave generating method and full-duplex optical fiber wireless communication system |
| CN101257352A (en) * | 2008-03-07 | 2008-09-03 | 北京大学 | ROF base station uplink of wavelength-division multiplex passive optical network and its system |
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