CN101257352B - ROF base station uplink of wavelength-division multiplex passive optical network and its system - Google Patents
ROF base station uplink of wavelength-division multiplex passive optical network and its system Download PDFInfo
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- CN101257352B CN101257352B CN2008101015047A CN200810101504A CN101257352B CN 101257352 B CN101257352 B CN 101257352B CN 2008101015047 A CN2008101015047 A CN 2008101015047A CN 200810101504 A CN200810101504 A CN 200810101504A CN 101257352 B CN101257352 B CN 101257352B
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Abstract
The invention discloses a ROF base station uplink of a wavelength-multiplexing passive optical network and its system, belonging to the optical communication field. The uplink comprises an optical coupler for coupling a part of signals in the downlink to input into the multimode laser; a mode-locking multimode laser for generating double mode-locking mode optical signals with the mode distance of millimeter wave frequency. The uplink signals are directly loaded to the double mode-locking mode optical signals for transmission by modulating the multimode laser. The system comprises a central station and a plurality of base stations including the uplink chains. The invention reduces the wavelength occupancy rate, effect from the downlink to the uplink signals, improves the modulation bandwidth, and decreases the equipment costs, realizes the amplification of the downlink double mode carrier wave, filtering and increasing of the optical carrier signal to noise ratio.
Description
Technical field
The present invention relates to a kind of Optical Fiber Transmission wireless signal (Radio-over-Fiber; Be abbreviated as ROF) up link and communication system thereof; Relate in particular to a kind of base station uplink and system thereof of the New-type radio-frequency signal optical fibre transmission system based on Wave division multiplexing passive optical network, belong to optical communication field.
Background technology
In the last few years, radio communication was fast-developing, and wireless user's cumulative year after year, business be variation more, and data service is sharply soaring, made broadband wireless signal and carrier frequency urgent to the increasing demand of high frequency expansion.At present, various electronic devices receive the restriction of electronic bottleneck, can not satisfy the growth of tomorrow requirement far away.The optical fiber transmission technique of radiofrequency signal (Radioover Fiber; Be called for short RoF) the huge capacity of fiber optic network and the adaptability and the mobility of Radio Access Network are organically combined; For wireless network provides " last kilometer " seamless access, be one of key technology of following ultra broadband mobile communication.When wireless signal was millimeter wave, the ROF communication system was called millimeter-wave communication system.
The ROF wavelength-division multiplex system comprises central station (Central Station; Be abbreviated as CS), base station (Base Station; Be abbreviated as BS), mobile radio terminal (Wireless Terminal; Be abbreviated as WT), form the ROF communication system of " light transmission wireless signal ", the optical modulations of wireless signal is the secondary sub-carrier modulation.The intermediate frequency of central station (Intermediate Frequency; Be abbreviated as IF) signal is sent to the terminal via the base station and is called down link; The radio frequency of mobile radio terminal (Radio Frequency is abbreviated as RF) signal is sent to central station through the base station and is called up link.Here the RF frequency＞＞the IF frequency.
In up link, the wireless RF signal loading of base station is to light carrier, and to central station, detection is laggard goes into backbone (Backbone) net through uplink optical fiber; In down link, to light carrier, be transferred to the base station from intermediate frequency (IF) signal loading of key (Backbone) net through downlink optical fiber, be sent to mobile radio terminal through wireless channel after the detection.If adopt the Star Network networking, then must need the two-way long optical fibers at least between central station and the base station, then 100 base stations need 2 * 100 road long optical fibers at least, also need consider light amplification and relaying on the link simultaneously; If employing wavelength division multiplexing communications systems; The light signal of different base station is separated with different optical channels on wavelength; Then can adopt an optical fiber loop and corresponding method trunking thereof to connect each base station; In the junction of each base station and optical fiber loop, accomplish the work that separates or insert optical channel with an equation of light division multiplexer (Optical Add-Drop Multiplexer is abbreviated as OADM).Visible through above-mentioned comparison; Wavelength-division multiplex system makes designs simplification, cost reduce (reference: K.Kitayama; " Architectural considerations on fiber-radio millimeter-wave wireless acess systems "; J.Fiber and Integrated Optics, pp167-185,2000).
In the ROF wavelength division multiplexing scheme that proposes, down link relatively is typically the employing light heterodyne method at present.Its cardinal principle is to adopt two frequency intervals to equal the narrow linewidth light longitudinal mode of required millimeter-wave frequency, and promptly so-called two longitudinal mode structure beat frequencies are realized the mm wave RF signal.In actual the use as long as intermediate frequency (IF) signal is modulated to one of them longitudinal mode or two longitudinal modes are modulated simultaneously at central station; Can obtain corresponding mm wave RF (RF) signal in the base station through photodiode (Photo Detector is abbreviated as PD) beat frequency then.Because the spectrum of two light waves is all very narrow in the transmission course, so effect of dispersion is less, can effectively suppress the power damage problem that causes owing to chromatic dispersion.Simultaneously; The method that produces two longitudinal mode structures is varied; Is the high frequency millimeter wave to the frequency requirement of microwave local oscillator unlike directly the light carrier that kind being gone up in the modulation of central station radio frequency (RF) signal, but a lower frequency even the method that has do not need microwave source, have so not only simplified the structure and the cost of base station; But also greatly reduce the processing signals cost of central station, so light heterodyne method becomes the focus of present countries in the world research ROF transmitter.Concrete principle schematic such as Fig. 1 (reference: Fang Zujie, Ye Qing, Liu Feng, Qu Ronghui, the progress of millimeter wave subcarrier Fibre Optical Communication Technology, Chinese laser, in April, 2006, the 33rd the 4th phase of volume, Page:482～488).
In the corresponding up link of the light heterodyne method of down link,, upward signal then mainly is divided into two kinds for providing the scheme of light carrier:
A kind of is that light carrier in the up link also is to adopt similar two longitudinal modes in the light heterodyne method, but different with the frequency of the light carrier of down link.(W.W.Hu，K.Inagaki，and?T?Ohria，″Radio-on-Fiber?Techniques?Using?Two-Mode?Injection-Locked?Lasers?for?Broadband?Millimeter-Wave?Communications″(invited)，3rd?International?Conference?on?Mircowave?and?Millimeter?Wave?Technology?Proceedings?2003，Page：7～10)
Its concrete implementation is seen Fig. 2.In up link; Mm wave RF (RF) signal that receives from antenna through photoelectric modem 8 at a high speed be loaded into the light carrier uplink (antenna and photoelectric modem be connected to the high-frequency electrical cable; High frequency coaxial line for example); The light carrier of the optical channel that it is shared (promptly two longitudinal mode light signal) is to be provided by the light source of central station through equation of light division multiplexer (OADM) 7; This uplink optical signal together is sent to central station through Fiber In The Loop FITE with other base station uplink optical signal, separates with the signal of Optical Demultiplexing 6 with each channel, by delivering to backbone (Backborn) net after 4 detections of low frequency photoelectric detector.
Adopting this up scheme that a very big benefit is arranged is exactly to adopt the photoelectric seismometer (PD) of a low frequency just can realize the down-conversion of intermediate frequency (IF) signal at central station, is about to intermediate frequency (IF) signal and from mm wave RF (RF) signal, extracts.Its principle is as shown in Figure 3, and solid line and dotted line have been represented two interval 60GHz (millimeter-wave frequency) patterns of FP laser locking in the base station respectively, have correlation between these two patterns, are correlated with because inject two patterns of signal, can take millimeter wave.The base station is modulated to the user's who receives up millimeter-wave signal (being assumed to be 57GHz) on the dual mode signal; At this moment sideband after the modulation of the dotted modes position of solid line pattern next door 3GHz signal of having arrived; Because the correlation of dotted line and solid line pattern, the solid line pattern also can go out the intermediate-freuqncy signal of 3GHz with this sideband beat frequency of dotted modes.After central station directly adopts the PIN pipe to receive, adopt electric low pass filter that the intermediate-freuqncy signal of 3GHz is taken out and get final product, and no longer need the millimeter wave mixer of high frequency to come down-conversion like this.
But adopt first kind of scheme that two very big problems are arranged.At first because the light carrier of the upward signal of base station is to be provided by central station; So a base station need take two wavelength channels; Wavelength resource can be quite nervous under the more situation in base station like this, and the communication that is unfavorable for arranging net simultaneously accordingly also can be high to the requirement of light amplification on the loop; Next adopts this scheme need antenna be received radio frequency rf signal in the base station and directly is modulated to two longitudinal mode light signals and gets on; This just needs the high-frequency electrical optical modulator of millimeter wave band, and (this device is included in the device 8 of Fig. 2; The photoelectric seismometer that comprises a high frequency in device 8 photoelectric modems); And each base station all needs to be equipped with, and the cost of realization is higher.
Second kind of scheme be in the light heterodyne method that retains in the line link used pair of longitudinal mode between centre wavelength, after base station filtering is taken out, the base station down signals loaded up and is transferred to central station.(Zhensheng?Jia，Jianjun?Yu，Gee-Kung?Chang，″A?Full-Duplex?Radio-Over-Fiber?System?Based?on?Optical?Carrier?Suppression?and?Reuse″，Photonics?Technology?Letters，IEEE，Volume?18，Issue?16，July?2006，Page：1726-1728)
The sketch map of concrete principle is as shown in Figure 4.The tunable optical carrier wave selected by central station is divided into two-way through optical coupler 12, and the low frequency electrooptic modulator 2 of leading up to loads intermediate frequency (IF) signal, and suppresses to be modulated at the two longitudinal mode light signals of formation in the low frequency modulations device 2 through light carrier again; The up link of preparing to be used for the base station is not then handled on another road, and two ways of optical signals is closed the descending base station that is sent to, bundle back through optical coupler 12 again.In the base station, used an optical circulator 14 and one with of Bragg grating 15 combinations of the selected wavelength of central station as centre wavelength; Descending pair of longitudinal mode light signal and up needed light carrier are separated; Downstream signal sends to wireless terminal through high frequency photoelectric seismometer 16; After light carrier then was loaded intermediate frequency (IF) signal that come through high-frequency mixer 17 down-conversions by radio frequency (RF) signal through low frequency electrooptic modulator 2, the up central station that is sent to was delivered to backbone network after through 4 detections of low frequency photoelectric seismometer.(between transmitting antenna and the high speed optoelectronic wave detector 16, between transmitting antenna and the frequency mixer 17, be connected to high-frequency electrical cable, for example high speed coaxial line between frequency mixer 17 and the low frequency electrooptic modulator 2.All the other base stations are connected to optical fiber and connect.)
Adopt the maximum benefit of this scheme no longer need take two wavelength for a base station exactly, and only need a wavelength to get final product, thereby improved utilization greatly for wavelength resource.But problem also clearly, need carry out down-conversion to radio frequency (RF) signal in the base station exactly, thereby each base station needs the Millimeter-Wave Source and the millimeter wave mixer of high frequency, and this has just increased the complexity of base station greatly.And the power that how to guarantee the upward signal light carrier also is a problem that needs are considered.
Summary of the invention
One of the object of the invention is to provide a kind of cost low, the up structure in base station based on the millimeter wave ROF communication system of Wave division multiplexing passive optical network that performance is high, be easy to realize.Concrete technical scheme is following:
Based on the up structure in base station of the millimeter wave ROF communication system of Wave division multiplexing passive optical network,, comprising for the up link of ROF wavelength division multiplexing communications systems provides the upstream rf signal load mode:
An optical coupler is with the sub-fraction input multimode laser that is coupled out of the signal in the down link.
The multimode laser structure that can realize injecting lock mould is as from laser.One output of said optical coupler is connected through optical fiber with the said end of the multimode laser of injecting lock mould of realizing; Described multimode laser can be multimode Fabry-Perot (Fabry-Perot; Be abbreviated as FP) laser or mode-locked laser, be used to produce intermode apart from being the mode-locking light signals in dual mode of millimeter-wave frequency.When the sub-fraction in the descending signal is descending two longitudinal mode signals when just in time matching with two longitudinal modes outputs of multimode laser, realize dual and locked mode.Through dual and locked mode, a multimode laser structure just can realize amplification, filtering (the original downstream signal of filtering) to descending pair of longitudinal mode signal and the effect that improves two longitudinal mode signal to noise ratios.Further; Injecting lock mould has enlarged the direct modulation bandwidth of laser; Make and directly to modulate through electric current to laser from next up radio frequency (RF) signal of wireless terminal emission; Get on thereby upward signal is loaded into the two longitudinal mode signals of light, need not use the millimeter wave electrooptic modulator, thereby reduce the base station cost and improved performance.(reference: E.K.Lau et al, " Ultra-high, 72 GHz resonance frequency and 44GHz bandwidth of injection-locked 1.55-μ mDFB lasers "; OFC/NFOEC; 2006, Technical Digest, paper OThG2)
The up structure in base station of described millimeter wave ROF communication system based on Wave division multiplexing passive optical network, the multimode laser structure of the injecting lock mould realized wherein comprises two kinds of concrete schemes at least:
Scheme one: as shown in Figure 5
Can realize the multimode laser structure of injecting lock mould, comprise:
An optical circulator realizes injecting light and the isolation that locks light, guarantees that the light signal of output is two longitudinal mode light signals of injecting lock mould.
An optical polarization controller realizes injection light is injected into the control of the polarization state of multimode laser, and it is identical with the local oscillator polarization direction of multimode laser to guarantee to inject polarization state of light.
A multimode laser makes that through the electric current or the temperature of regulating multimode laser injecting light aims at the light longitudinal mode of local oscillator, realizes the two longitudinal mode signals of injection locking output light; Can also realize through modulation radiofrequency signal is loaded on the light signal simultaneously to its electric current.
Optical circulator is connected through optical fiber with optical coupler, optical polarization controller and equation of light division multiplexer respectively; The optical polarization controller other end is connected through optical fiber with an end of multimode laser; The RF signal that antenna receives adopts the high-frequency electrical cable to be connected with the modulated terminal of multimode laser.
This programme is injected into through optical circulator through coupler taking-up sub-fraction downstream signal and realizes injection locking in the multimode laser; Realize that through current-modulation the light of radiofrequency signal loads simultaneously, from the up transmission of 3 ports taking-up uplink dual longitudinal mode light signal of optical circulator 8 to multimode laser.
Scheme two: as shown in Figure 6
Can realize the multimode laser structure of injecting lock mould, comprise:
An optical polarization controller realizes injection light is injected into the control of the polarization state of multimode laser, and it is identical with the local oscillator polarization direction of multimode laser to guarantee to inject polarization state of light.
The travelling-wave type Multi-Longitudinal Mode laser of a both-end coupling, the for example Fabry-Perot of travelling-wave type (FP) laser.This device can utilize the method for making electrooptic modulator to make, and adopts the both-end coupling, thereby realizes injecting light and locking output light non-interference, has saved an optical circulator.Electric current or temperature through regulating multimode laser make that injecting light aims at the light longitudinal mode of local oscillator, realize the two longitudinal mode signals of injection locking output light; Can also realize that through modulation radiofrequency signal is loaded on the light signal simultaneously to its electric current.(the travelling-wave type Multi-Longitudinal Mode laser externally has three interfaces, and wherein two is optical fiber structure, realizes respectively that light beam is gone into locked mode to export; Other has an electrical interface, realizes the modulation to its drive current.)
One end of optical coupler and Polarization Controller is connected through optical fiber, and an end of the other end of Polarization Controller and travelling-wave type Multi-Longitudinal Mode laser is connected through optical fiber, adopts optical fiber to be connected between the other end of travelling-wave type Multi-Longitudinal Mode laser and the equation of light division multiplexer; Antenna adopts the high-frequency electrical cable to be connected with the current-modulation end of travelling-wave type Multi-Longitudinal Mode laser.
This programme takes out the end realization injection locking that the sub-fraction downstream signal directly is injected into the travelling-wave type multimode laser through coupler; Realize that through current-modulation the light of radiofrequency signal loads simultaneously, from the up transmission of other end taking-up uplink dual longitudinal mode light signal of multimode laser to multimode laser.
Another object of the present invention provides a kind of millimeter wave ROF communication system based on Wave division multiplexing passive optical network; Described millimeter wave ROF communication system based on Wave division multiplexing passive optical network adopts the up structure in aforesaid base station, also comprises a central station and base station down link.The Wavelength division multiplexed light source row of said central station can adopt (the reference: Hu Weiwei of wavelength division multiplexing millimeter wave light source row; Wavelength division multiplexing millimeter wave light source row and corresponding Optical Fiber Transmission communicating wireless signals system thereof; Patent No. ZL 03149882.5); The light source of Wavelength division multiplexed light source row also can adopt stimulated Brillouin scattering effect (Stimulated Brillouin Scattering is abbreviated as SBS) in a gain cavity, to produce multistage Stokes (Stocks) light and produce.(reference: Yichun Shen, Xianmin Zhang, and Kangsheng Chen; " All-Optical Generation of Microwave and Millimeter Wave Using a Two-Frequency Bragg Grating-Based Brillouin Fiber Laser "; JOURNAL OF LIGHTWAVE TECHNOLOGY; VOL.23; NO.5, MAY 2005Page:1860～1864).
In sum, technical scheme of the present invention is:
A kind of millimeter wave optical fiber transmitting wireless signals communication system base station uplink structure of Wave division multiplexing passive optical network, it comprises an equation of light division multiplexer, an optical coupler and an injecting lock mould double-longitudinal-mode laser,
The input of said optical coupler is connected through optical fiber with the descending output of said equation of light division multiplexer;
One output of said optical coupler is connected through optical fiber with the input of said injecting lock mould double-longitudinal-mode laser;
The output of said injecting lock mould double-longitudinal-mode laser is connected through optical fiber with the up input of said equation of light division multiplexer;
The current-modulation end of said injecting lock mould double-longitudinal-mode laser is connected through the high-frequency electrical cable with antenna.
The small scale output of said optical coupler is connected with said injecting lock mould double-longitudinal-mode laser.
Said injecting lock mould double-longitudinal-mode laser comprises an optical circulator, an optical polarization controller, a multimode laser; Its annexation is: said optical circulator 1 port is connected through optical fiber with an output of said optical coupler; Said optical circulator 2 ports are connected through optical fiber with said optical polarization controller one end; The said optical polarization controller other end is connected through optical fiber with an end of said multimode laser, and said optical circulator 3 ports are connected through optical fiber with the up input of said equation of light division multiplexer.
Said injecting lock mould dual-mode laser device comprises an optical polarization controller, a travelling-wave type Multi-Longitudinal Mode laser; Its annexation is: said optical polarization controller one end is connected through optical fiber with said optical coupler; The said optical polarization controller other end is connected through optical fiber with said travelling-wave type Multi-Longitudinal Mode laser one end, and the said travelling-wave type Multi-Longitudinal Mode laser other end is connected through optical fiber with the up input of said equation of light division multiplexer.
Said multimode laser is one to have Fabry-Perot (FP) laser of the direct current-modulation interface of mm wave RF.
Said travelling-wave type Multi-Longitudinal Mode laser is a mode-locked laser.
A kind of millimeter wave optical fiber transmitting wireless signals communication system of Wave division multiplexing passive optical network comprises a central station, several base stations, it is characterized in that said base station uplink adopts above-mentioned base station uplink.
The Wavelength division multiplexed light source of said central station is classified wavelength division multiplexing millimeter wave light source row as; The light source of said Wavelength division multiplexed light source row is the multi wave length illuminating source that multistage stokes light produces.
The good effect of content of the present invention
Adopt the up structure in the base station based on Wave division multiplexing passive optical network of the present invention, can be easy to realize low-cost, high performance millimeter wave ROF Wave division multiplexing passive optical network communication system.It has following four advantages:
(1) adopts the ascending unit of cheap FP laser,, realize the bimodulus light source of up link through adopting the dual mode signal injecting lock mould of down link as the base station.
At first through bimodulus injecting lock mould technology, make the consistent wavelength of uplink downlink, promptly use same wavelength between central station and base station, to set up two-way communication, reduced the taking of optical wavelength resources, particularly suitable in optical wavelength resources wdm system in short supply.
Secondly; Adopt bimodulus injecting lock mould technology, utilize the locked mode characteristic of multimode laser, because the generation of locked mode has not only excited the power output of two useful longitudinal modes; Also suppressed the output of noise and other patterns simultaneously; Therefore can reduce the influence of down link to upward signal greatly, because the cost of FP laser is lower, effect is to have utilized lower cost to realize amplification, filtering and three kinds of effects of raising light carrier signal to noise ratio to descending bimodulus carrier wave simultaneously; Suppress the original information of down link simultaneously, realized the WDM-PON of ROF signal.
The 3rd; In up link, adopt the two longitudinal mode signals of light as up light carrier; Can reduce the demodulation cost of central station greatly, because after the mm wave RF signal that the base station receives directly is modulated to two longitudinal mode signals, can directly adopts the photoelectric seismometer (photoelectric seismometer of low frequency has the effect of electric low pass filter) of low frequency to detect at central station and receive; And no longer need millimeter wave mixer, thereby saved system cost greatly.This point is identical with the advantage of first kind of scheme in the background technology.
(2) adopt the multimode laser of dual and locked mode to realize that as optical carrier source the direct current-modulation of upstream data loads
Adopt its direct current-modulation bandwidth of multimode laser (for example Fabry-Perot (FP) laser) of injecting the lock bimodulus to increase (reference: E.K.Lau et al greatly; " Ultra-high; 72 GHz resonance frequency and, 44 GHz bandwidth of injection-locked 1.55-μ m DFB lasers ", OFC/NFOEC, 2006; Technical Digest, paper OThG2).Through injecting lock mould, the OSNR of the two longitudinal mode light signals that obtain is significantly improved simultaneously.More than two aspects make directly FP lasers to dual and locked mode carry out current-modulation to realize loading up mm wave RF signal and become possibility.
(3) multimode laser of employing both-end coupling (travelling-wave type)
In to the experiment of multimode laser (for example Fabry-Perot (FP) laser) injecting lock mould, find; Because main employing is the injecting lock mould mode of circulator injecting structure at present; The injection reflection of light that is brought by the FP laser tube core is sizable; This sub-fraction that is equivalent on the basis of the two longitudinal mode light signals of locking, superpose is again injected optical noise (downlink optical signal), thereby makes the OSNR of uplink optical signal descend.
And the method that adopts the both-end coupling realizes multimode laser, then injects light and can not come out with locking output light, so at first can save a circulator, has reduced system cost.Owing to the problem of coupling efficiency, inject light path and can not directly aim at output locking light path, but be appreciated that to be two processes: light is injected into multimode laser and the multimode laser locking is exported simultaneously.So just reduced to greatest extent and injected the influence of light to FP locking light, the information of better wiping down link guarantees higher OSNR.
The multiwavelength laser that (4) can adopt stimulated Brillouin scattering (SBS) effect to produce is realized the generation of central station Wavelength division multiplexed light source.
Between the stokes light (Stocks) that stimulated Brillouin scattering (SBS) effect produces and and pumping (Pump) light between have certain phase correlation; So under the phase noise tolerance condition with higher of system to millimeter-wave signal; Can adopt stimulated Brillouin scattering (SBS) effect in a chamber that gain amplifier arranged, to produce multi-wavelength; Realize that with these many longitudinal modes structures dual and locked mode obtains down link signal (reference: Yichun Shen then; Xianmin Zhang, and Kangsheng Chen; " All-Optical Generation of Microwave and Millimeter Wave Using a Two-Frequency Bragg Grating-Based Brillouin Fiber Laser "; JOURNAL OF LIGHTWAVE TECHNOLOGY; VOL.23; NO.5, MAY 2005Page:1860～1864).
Description of drawings
Fig. 1 light heterodyne method principle schematic;
(a) for the light signal spectrum, (b) be the signal of telecommunication frequency spectrum of beat frequency,
Fig. 2 adopts two longitudinal mode light carrier up link schemes;
Adopt the dual mode signal modulated rf signal to realize the schematic diagram of the direct down-conversion of central station in Fig. 3 base station uplink;
(a) before the uplink modulation, (b) after the uplink modulation,
Fig. 4 adopts and keeps the scheme that centre wavelength realizes up link;
Fig. 5 is based on the up link scheme of circulator structure;
Fig. 6 is based on the up link scheme of travelling-wave type multimode laser structure;
Wherein, the device name that digital number refers among the above-mentioned figure is:
1---the single-mode laser (DFB) of specified wavelength, 11---multimode laser (FP),
2---low frequency electrooptic modulator (EOM), 3---low frequency microwave generating source (MW-LO),
33---millimeter wave oscillation source (MMW-LO), 4---low frequency photoelectric seismometer (PD),
5---optical multiplexer (MUX), 6---optical demultiplexer (DMUX),
7---equation of light division multiplexer (OADM), 8---photoelectric modem (EAT or EOM+PD),
9---fiber amplifier (OAMP), 99---monomode fiber (SMF),
12---optical coupler (Optical Coupler), 13---Polarization Controller (PC), 14---optical circulator (OC),
15---grating (FBG), 16---high speed optoelectronic detector (PD), 17---millimeter wave mixer (MIX).
Embodiment
Embodiment 1:
As shown in Figure 5; The centre wavelength of communicating by letter with central station in some base stations is the standard wave length in the ITU-T standard channel; For example adopt wavelength division multiplexing millimeter wave light source row to produce a pair of longitudinal mode light signal, centre wavelength is 1554.32nm, and the millimeter-wave frequency of transmission is 60GHz.Comprise an equation of light division multiplexer (OADM) in the down link of system base-station, the photoelectric seismometer of a high speed.Two longitudinal mode light signals of down link get into corresponding base station through equation of light division multiplexer from the ring-shaped light fibre web, obtain mm wave RF (RF) signal at high speed optoelectronic wave detector glazing beat frequency then, and launch through high-frequency electrical cable connection antenna.The system base-station up link comprises an optical coupler, an optical circulator, and an optical polarization controller, Fabry-Perot (FP) laser that has the direct current-modulation interface of mm wave RF, its longitudinal mode spacing is 60GHz.Two longitudinal mode signals in the down link are told sub-fraction through optical coupler inject 1 mouthful of optical circulator; 2 mouthfuls of optical circulator connect the polarization state that Polarization Controller control is injected into the FP laser; It is identical that the local oscillator polarization direction of polarization state (modulating polarization controller) and FP laser is injected in adjustment; The adjustment electric current or (with) temperature two longitudinal mode consistent wavelength of make injecting the two longitudinal modes of light and FP local oscillator realize the injection dual and locked modes, but the locking light carrier of acquisition uplink; The up radiofrequency signal of the wireless terminal that antenna for base station receives realizes that through the FP laser being carried out direct current-modulation the direct sunshine of radiofrequency signal loads (the direct current-modulation end of antenna and FP laser adopts the high frequency cable linear chain to connect); The two longitudinal mode signals of light that loaded radiofrequency signal at last directly output to backbone network with the detection of low frequency photoelectric seismometer through the up base station that is sent to of equation of light division multiplexer (OADM).
Embodiment 2:
As shown in Figure 6; The centre wavelength of communicating by letter with central station in some base stations is the standard wave length in the ITU-T standard channel; For example adopt wavelength division multiplexing millimeter wave light source row to produce a pair of longitudinal mode light signal, centre wavelength is 1550.92nm, and the millimeter-wave frequency of transmission is 60GHz.Comprise an equation of light division multiplexer (OADM) in the down link of system base-station, the photoelectric seismometer of a high speed.Two longitudinal mode light signals of down link get into corresponding base station through equation of light division multiplexer from the ring-shaped light fibre web, obtain mm wave RF (RF) signal at high speed optoelectronic wave detector glazing beat frequency then, and launch through high-frequency electrical cable connection antenna.The system base-station up link comprises an optical coupler, an optical polarization controller, and travelling-wave type Fabry-Perot (FP) laser that has the direct current-modulation interface of mm wave RF, its longitudinal mode spacing is 60GHz.Two longitudinal mode signals in the down link are told sub-fraction through optical coupler be injected into travelling-wave type FP laser one end through Polarization Controller control; It is identical that the local oscillator polarization direction of polarization state (modulating polarization controller) and FP laser is injected in adjustment; The adjustment electric current or (with) temperature make to inject two longitudinal mode consistent wavelength realization injection dual and locked modes of the two longitudinal modes of light and FP local oscillator, can be obtained the locking light carrier of uplink by the other end of FP laser; The up radiofrequency signal of the wireless terminal that antenna for base station receives realizes that through the FP laser being carried out direct current-modulation the direct sunshine of radiofrequency signal loads (the direct current-modulation end of antenna and FP laser adopts the high frequency cable linear chain to connect); The two longitudinal mode signals of light that loaded radiofrequency signal at last directly output to backbone network with the detection of low frequency photoelectric seismometer through the up base station that is sent to of equation of light division multiplexer (OADM).
Claims (10)
1. the millimeter wave optical fiber transmitting wireless signals communication system base station uplink structure of a Wave division multiplexing passive optical network, it comprises an equation of light division multiplexer, an optical coupler and an injecting lock mould double-longitudinal-mode laser,
The input of said optical coupler is connected through optical fiber with the descending output of said equation of light division multiplexer;
One output of said optical coupler is connected through optical fiber with the input of said injecting lock mould double-longitudinal-mode laser, and the sub-fraction that is coupled out of the signal in the down link is imported said injecting lock mould double-longitudinal-mode laser;
The output of said injecting lock mould double-longitudinal-mode laser is connected through optical fiber with the up input of said equation of light division multiplexer;
The current-modulation end of said injecting lock mould double-longitudinal-mode laser is connected through the high-frequency electrical cable with antenna.
2. uplink structure as claimed in claim 1 is characterized in that the small scale output of said optical coupler is connected with said injecting lock mould double-longitudinal-mode laser.
3. uplink structure as claimed in claim 2; It is characterized in that said injecting lock mould double-longitudinal-mode laser comprises an optical circulator, an optical polarization controller, a multimode laser; Its annexation is: said optical circulator 1 port is connected through optical fiber with an output of said optical coupler; Said optical circulator 2 ports are connected through optical fiber with said optical polarization controller one end; The said optical polarization controller other end is connected through optical fiber with an end of said multimode laser, and said optical circulator 3 ports are connected through optical fiber with the up input of said equation of light division multiplexer.
4. uplink structure as claimed in claim 2; It is characterized in that said injecting lock mould double-longitudinal-mode laser comprises an optical polarization controller, a travelling-wave type Multi-Longitudinal Mode laser; Its annexation is: said optical polarization controller one end is connected through optical fiber with said optical coupler; The said optical polarization controller other end is connected through optical fiber with said travelling-wave type Multi-Longitudinal Mode laser one end, and the said travelling-wave type Multi-Longitudinal Mode laser other end is connected through optical fiber with the up input of said equation of light division multiplexer.
5. uplink structure as claimed in claim 3 is characterized in that said multimode laser is one to have Fabry-Perot (FP) laser of the direct current-modulation interface of mm wave RF.
6. uplink structure as claimed in claim 4 is characterized in that said travelling-wave type Multi-Longitudinal Mode laser is a mode-locked laser.
7. the millimeter wave optical fiber transmitting wireless signals communication system of a Wave division multiplexing passive optical network; Comprise a central station, several base stations; It is characterized in that said base station uplink comprises an equation of light division multiplexer, an optical coupler and an injecting lock mould double-longitudinal-mode laser
The input of said optical coupler is connected through optical fiber with the descending output of said equation of light division multiplexer;
One output of said optical coupler is connected through optical fiber with the input of said injecting lock mould double-longitudinal-mode laser, and the sub-fraction that is coupled out of the signal in the down link is imported said injecting lock mould double-longitudinal-mode laser;
The output of said injecting lock mould double-longitudinal-mode laser is connected through optical fiber with the up input of said equation of light division multiplexer;
The current-modulation end of said injecting lock mould double-longitudinal-mode laser is connected through the high-frequency electrical cable with antenna.
8. system as claimed in claim 7; It is characterized in that said injecting lock mould double-longitudinal-mode laser comprises an optical circulator, an optical polarization controller, a multimode laser; Its annexation is: said optical circulator 1 port is connected through optical fiber with an output of said optical coupler; Said optical circulator 2 ports are connected through optical fiber with said optical polarization controller one end; The said optical polarization controller other end is connected through optical fiber with an end of said multimode laser, and said optical circulator 3 ports are connected through optical fiber with the up input of said equation of light division multiplexer.
9. system as claimed in claim 7; It is characterized in that said injecting lock mould double-longitudinal-mode laser comprises an optical polarization controller, a travelling-wave type Multi-Longitudinal Mode laser; Its annexation is: said optical polarization controller one end is connected through optical fiber with said optical coupler; The said optical polarization controller other end is connected through optical fiber with said travelling-wave type Multi-Longitudinal Mode laser one end, and the said travelling-wave type Multi-Longitudinal Mode laser other end is connected through optical fiber with the up input of said equation of light division multiplexer.
10. system as claimed in claim 7 is characterized in that the Wavelength division multiplexed light source of said central station is classified wavelength division multiplexing millimeter wave light source row as; The light source of said Wavelength division multiplexed light source row is the multi wave length illuminating source that multistage stokes light produces.
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| CN101582718B (en) * | 2009-06-12 | 2011-09-21 | 北京科技大学 | Wavelength protection method based on wavelength utilization rate in single link |
| CN101807956B (en) * | 2009-12-25 | 2013-05-08 | 北京交通大学 | Subway train-ground communication system applying ROF and fiber grating sensing |
| CN101877614A (en) * | 2010-06-24 | 2010-11-03 | 北京邮电大学 | Millimeter wave WDM-ROF (Wavelength Division Multiplexing-Radio Over Fiber) system and method based on supercontinuum |
| CN101908930A (en) * | 2010-07-28 | 2010-12-08 | 李淑英 | Method and device capable of synchronously realizing brillouin distributed optical fiber sensing monitoring and data communication |
| CN102780527B (en) * | 2012-05-03 | 2016-01-20 | 中国西安卫星测控中心 | A kind of fiber device of long range propagation S frequency range measurement and control signal |
| CN103516434B (en) * | 2012-06-19 | 2016-08-31 | 上海贝尔股份有限公司 | Optical sender |
| CN103809167B (en) * | 2014-01-20 | 2016-08-17 | 浙江大学 | A kind of FP interference type spectral filter resonance frequency locking device and method |
| CN109983636A (en) * | 2016-11-28 | 2019-07-05 | 日本电气株式会社 | The equipment of optical communication equipment and supply for the exciting light of light amplification |
| CN110891206B (en) * | 2019-11-12 | 2022-02-08 | 南京邮电大学 | WDM-RoF-PON system based on optical frequency comb and polarization multiplexing |
| CN114389126A (en) * | 2020-10-16 | 2022-04-22 | 华为技术有限公司 | Laser chip, injection locking laser and network equipment |
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| CN101001126A (en) * | 2006-08-03 | 2007-07-18 | 余建军 | Optical mm wave generating and wavelength reuse method and system in all-duplex communication radio Over-Fiber |
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