CN102413388A - Optical fiber wireless RoF passive optical network realizing method based on optical code division multiplexing - Google Patents
Optical fiber wireless RoF passive optical network realizing method based on optical code division multiplexing Download PDFInfo
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Abstract
The invention discloses an optical fiber wireless RoF passive optical network realizing method based on an optical code division multiplexing (OCDM). In an optical line terminal (OLT) RoF center station, a signal realizes double-sideband modulation, three paths of generated carrier components are respectively modulated with wired and wireless user data and are not subjected to modulation. The signal is coupled to an optical fiber channel after coded by the OCDM, transmitted to an optical distribution network (ODN) and allocated to each optical network unit (ONU). The ONU carries out OCDM decoding on the received signal, then three paths of components are separated, one path of components is directly sent to a wired user terminal after subjected to photoelectric detection, the other two paths of components enter an RoF base station for carrying out beat frequency to obtain a radio frequency signal, the radio frequency signal is subjected to ECDMA (Electric Code Division Multiple Access) coding and transmitted through an antenna after subjected to electric amplification, and a wireless user terminal obtains a required signal through ECDMA decoding. The invention provides an effective path for realizing wired/wireless secrecy access in a PON (Passive Optical Network) system.
Description
Technical field
The invention belongs to the optical communication technique field, more specifically, relate to a kind of light carrier radio communication (RoF) passive optical network based on Optical Code Division Multiplexing (OCDM).
Background technology
In recent years; Development along with rapid technological improvements such as computer, communications; Users constantly increase the demand of miscellaneous services such as video request program, DTV, teleconference; And traditional copper wire access net obviously can not satisfy this requirement, and this just makes the band optical fiber access network technology obtain development fast, becomes a research focus of communication technical field.(Passive Optical Network, notion PON) occurred so far more than 10 year from the mid-90 in 20th century EPON.The PON system adopts the tree topology structure of point to multiple spot; I.e. optical line terminal (Optical Line Terminal; OLT) Optical Distribution Network through forming by passive devices such as optical branching device, optical combiners (Optical Distribution Network, ODN) with a plurality of optical network units (Optical Network Unit, ONU) continuous; Thereby broken through the access module of traditional point-to-point, be complementary with the service feature of broadband access network.In addition, the sourceless characteristic of PON makes it to be convenient to operation, maintenance and management.Because PON is with low cost, capacity is big, and its Dynamic Bandwidth Allocation characteristic can make it high efficiency bearing data service, thereby the PON technology has caused both at home and abroad and pays close attention to widely.
Along with the arrival in 3G epoch, the radio communication develop rapidly, data service increases considerably, make broadband wireless signal with and carrier wave expand to higher frequency.But because the restriction of electronic device frequency bottleneck, traditional wireless communication technology can't realize the long-distance transmissions of high-speed high capacity broadband wireless signal carrier wave, so (Radio over Fiber, RoF) technology is all over arising for light carrier radio communication.The RoF technology is a kind of wireless access technology that optical fiber communication and radio communication are combined, the long-distance transmissions that can realize high-speed high frequency rate broadband wireless signal with effectively insert.(Central Station is CS) with each base station (Base Station, the transmission link between BS), and directly utilize the light carrier that is produced by CS to transmit the mm wave RF signal as central station for RoF system employs optical fiber.In whole system; Optical fiber only plays the effect of transmission; And exchange, the regeneration of control and signal etc. all concentrates on CS, the required broadband wireless signal in wireless access terminal carries the mm wave RF signal through BS to the light that receives to carry out opto-electronic conversion, amplification and antenna and launches and obtain.Therefore, cost and complex equipment has all focused on CS in the RoF system, and a plurality of far-end BS share these equipment, thereby has reduced power consumption and the cost of BS greatly.In addition, utilize optical fiber, have low-loss, high bandwidth and prevent characteristics such as electromagnetic interference as transmission link.Exactly because these unrivaled advantages of RoF make it comprise that in the broadband wireless communications in future there is wide application prospect in the broadband radio access network field.With the RoF technical application can these two kinds of technology of favourable combination in the PON system advantage, this direction has become one of international research focus at present.But the confidentiality based on the PON system of RoF is not enough; Can't satisfy high safety and the confidentiality requirement of user terminal to demand information; Therefore, the antijamming capability and the confidentiality that how to improve based on the technological PON system of RoF will be key issues that is worth further investigation.
Optical Code Division Multiplexing (Optical Code Division Multiplexing, OCDM) technology is one of technology that has at present high security information transmission advantage, this technology has received much attention since proposing the beginning of the eighties.The OCDM technology divides the flexibility of multiple access (ECDMA) to combine on the super large bandwidth and the code of fiber medium, is one of common PON access mode.The OCDM system utilizes mutually orthogonal address code such as light orthogonal code etc. that the signal of transmission is carried out corresponding encoding and decoding and handles, and makes that the signal of different user can shared channel, thereby has improved the capacity of network.Simultaneously, distribute to that the mutually orthogonal OCDM of making system has very strong antijamming capability and confidentiality between the address code of different user, this point is that other access modes can't match in excellence or beauty.In addition, the OCDM system supports asynchronous access, and is therefore lower to synchronous requirement.Because the develop rapidly of 3G communication; The various communications infrastructures are gradually improved; Thereby be easy to use the OCDM technology that the existing communications infrastructure is upgraded to strengthen the level security of communication, thereby satisfy the requirement of real social people to safe and secretization of communication quality.From present patent or literature survey situation, the OCDM technical application that will have the confidentiality advantage is not seen report as yet to the PON system based on the RoF technology.
Announce on December 01st, 2010; Publication number is CN101902666A; Name is called in the patent of invention of " optical code division multiple access passive optical network, optical distribution network device and optical line terminal ", and the inventor provides a kind of and handled the technology that enlarges the access user capacity that has the OCDM EPON now through at Optical Distribution Network input signal being carried out wavelength division multiplexing and OCDM encoding and decoding.Though through being combined into the capacity that one tunnel Signal Processing mode can enlarge user of access network on the light carrier that multichannel data is modulated to different wave length and by dense wave division multiplexer; But this scheme needs some different wavelength of laser devices and dense wave division multiplexer; Thereby this scheme is to realize OCDM EPON dilatation function on the cost of cost sacrificing, and this method can not be supported wireless access.Announced on 07 20th, 2011; Publication number is CN102130805A; Name is called in the patent of invention of " a kind of towards merging the multi-service terminal system that inserts "; The fusion that the inventor proposes to utilize the RoF technology to realize the multiple wired and wireless traffic of PON system inserts, and user terminal can be selected network and business as required.Though this scheme can realize wired fusion with wireless traffic and insert; But this scheme is not considered the anti-interference and privacy concerns of message transmission; Promptly as long as microbend fiber; The analog signal of transmitting in the optical fiber just is easy to leak, and eavesdropping side only need just can obtain and crack each road signal with a spectrometer, simultaneously; Wireless signal transmits in the air channel also to be stolen by non-designated user easily, and this obviously can't satisfy the level security requirement to demand information of wired and wireless user terminal.In addition, at document [Y.Hsueh, M.Huang, S.Fan; And G.-K.Chang, " A Novel Lightwave Centralized Bidirectional Hybrid Access Network:Seamless Integration of RoF with WDM-OFDM-PON, " IEEE Photon.Technol.Lett.; Vol.23, no.15, pp.1085-1087; Aug., 2011.] in, the author proposes a kind of mixing bidirectional passive optical-fiber network access net system of concentrated wavelength.This scheme has been carried out good fusion with light carrier radio communication technology and Wave division multiplexing passive optical network technology, and is used for transmitting orthogonal frequency-division multiplex singal.Though the fusion through above-mentioned two kinds of technology can realize that a kind of wire/wireless mixes the passive optical network that inserts; But there is big problem in this scheme on the anti-interference and confidentiality of signal transmission, can't satisfy wired and the level security requirement of wireless user terminal to demand information equally.
Summary of the invention
In order to overcome the deficiency of prior art; The present invention provides a kind of optical-fiber wireless RoF EPON implementation method that has high security based on OCDM; Solving wired seamless fusion and wired and the wireless user terminal with wireless traffic in Access Network field, thereby satisfy the requirement of real social people to business service diversification and safe and secretization of communication quality to problems such as the high safety of demand information and confidentiality requirements.
Describe content of the present invention for ease, earlier the relevant speciality term that occurs in the content of the present invention described:
PON (Passive Optical Network): EPON;
OLT (Optical Line Terminal): optical line terminal;
ODN (Optical Distribution Network): Optical Distribution Network;
ONU (Optical Network Unit): optical network unit;
RoF (Radio over Fiber): light carrier radio communication;
CS (Central Station): central station;
BS (Base Station): base station;
OCDM (Optical Code Division Multipleing): Optical Code Division Multiplexing;
ECDMA (Electrical Code Division Multiple Access): code divides multiple access.
In order to realize the foregoing invention purpose; The present invention provides a kind of confidentiality optical-fiber wireless RoF passive optical network based on OCDM, it is characterized in that: comprise ECDMA coding in double-sideband modulation and intensity modulated in the RoF central station, light source, radio frequency source, OCDM coding, coupling, Optical Fiber Transmission, de, OCDM decoding, photodetection, the RoF base station, tele-release is big and the antenna emission is formed.The step of the concrete implementation method of the present invention is:
The 1st step: centre frequency is that the LASER Light Source of f0 is that the radio frequency source excitation of F is carried out double-sideband modulation down in frequency, thereby the generation frequency is respectively three carrier components of f1=f0-F, f0 and f2=f0+F;
The 2nd step: the frequency that double-sideband modulation is obtained with a demodulation multiplexer is respectively three carrier components of f1, f0 and f2 and separates; Each road wire user data is modulated to respectively on the corresponding f0 carrier component; Each road wireless user data is modulated to respectively on the corresponding f1 carrier component; Frequency is that the carrier component of f2 is left intact, and last frequency after will modulate again by a multiplexer is that frequency that f1, f0 and not having modulates is that three road signal multiplexings of f2 are to together;
The 3rd step: unique OCDM address code of giving each user according to system assignment; The mixed signal that obtains after utilizing the OCDM encoder to intensity modulated is carried out the OCDM coding; Thereby the OCDM code signal that the n road that obtains is parallel is coupled as one the tunnel with the coupler OCDM code signal that this n road is parallel again;
The 4th step: be transmitted directly in the fiber channel after the parallel OCDM code signal in n road is coupled as one the tunnel by coupler, be transferred to ODN from OLT earlier, give each ONU by ODN with signal allocation again, image intensifer is used for the light signal of having decayed is amplified;
The 5th step: be coupled as one tunnel OCDM code signal and be divided into n by the decoupler that is positioned at ODN place and restraint; Send to n corresponding ONU respectively; Each ONU need carry out the OCDM decoding processing to the light signal that receives, thereby extract required light signal in order to obtain the signal that OLT sends oneself to;
The 6th step: through the light signal after the OCDM decoding processing is that three signal components of f1, f0 and f2 are separated by a demodulation multiplexer with frequency earlier; The frequency of carrying wired user data is that the signal component of f0 directly gets into photodetector and carries out opto-electronic conversion; Thereby obtain the required data of wire user and directly send to the wire user terminal; The frequency of carrying wireless user data is that the signal component of f1 and the frequency that does not have modulation signal are that the carrier component of f2 gets into photodetector in the RoF base station together and carries out beat frequency and handle, and is the wireless signal of 2F thereby obtain the required rf frequency of wireless user;
The 7th step: the beat frequency processing through photodetector in the RoF base station can obtain the required radiofrequency signal of wireless user; According to the ECDMA address code of distributing to the different radio user radiofrequency signal is carried out the ECDMA encoding process again, thereby guarantee only to have the wireless signal that wireless user that authority promptly has corresponding ECDMA address code could correctly decode and receive demand;
The 8th step: the radiofrequency signal behind the process ECDMA coding is amplified to by an electrical power amplifier and is fit to be transmitted directly in the air channel by antenna after the antenna emitted power level, and wireless user terminal only need carry out decoding processing according to the ECDMA address code of distributing to oneself in certain distance range just can successfully receive required wireless signal.
Through carrying out above-mentioned steps, realization that just can be successful this optical-fiber wireless RoF passive optical network provided by the invention based on OCDM with high security.
Description of drawings:
Fig. 1 is the practical implementation flow chart of steps of a kind of optical-fiber wireless RoF EPON implementation method based on OCDM provided by the invention;
Fig. 2 is the theory diagram of embodiment 1 of the present invention;
Fig. 3 is the detailed block diagram of embodiment 1 of the present invention;
Fig. 4 is the theory diagram of embodiment 2 of the present invention;
Fig. 5 is the detailed block diagram of embodiment 2 of the present invention;
Fig. 6 is the detailed block diagram of multiple light courcess RoF-central station in the embodiment 1 of the present invention;
Fig. 7 is the detailed block diagram of single light source RoF-central station in the embodiment 2 of the present invention;
Fig. 8 is the theory diagram of OCDM coder/decoder array in embodiment 1 of the present invention and 2;
Fig. 9 is based on the detailed block diagram of the OCDM coder/decoder array of fibre delay line in embodiment 1 of the present invention and 2;
Figure 10 is the detailed block diagram of RoF-base station in embodiment 1 of the present invention and 2;
Figure 11 is the spectrogram of the double-side band carrier signal that the RoF-central station carries out obtaining after the double-sideband modulation in embodiment 1 of the present invention and 2.
Embodiment:
The present invention has two embodiments, is provided by two practical implementation instances respectively, will combine accompanying drawing and these two embodiments that the present invention is done further explanation below.
The theory diagram of embodiment 1 of the present invention and detailed block diagram respectively as shown in Figures 2 and 3, the characteristic one of this embodiment is: OLT be used to produce light carrier, modulation wire/wireless subscriber signal, OCDM encoding process and will encode after n road light signal be coupled to and be transmitted into optical fiber link together.Optical fiber link is used to transmit the light signal of OLT emission.Image intensifer is used for the light signal that the amplifying fiber link transmits.Decoupler is used for the light signal that receives is divided into the n road and sends to each ONU.A plurality of ONU are used to receive light signal, OCDM decoding processing, photodetection, the ECDMA encoding process that optical fiber link sends and send the wire/wireless signal to wired nothing/line user terminal respectively.Its characteristic two is: multiple light courcess RoF central station is as the part of OLT, and the RoF base station is as the part of ONU, and the OCDM decoder lays respectively among each ONU.
Said OLT comprises: multiple light courcess RoF central station, use a plurality of light sources to produce the wired light carrier with wireless traffic of transmission and also be modulated on the corresponding light carrier with radio service data wired; OCDM encoder array is used for encoding process is carried out in the narrow light pulse that has subscriber signal of multiple light courcess RoF central station output, and each ONU distributes a unique address code, and the address code between each ONU is mutually orthogonal; Coupler is used for the light signal behind the multiplex coding of OCDM encoder array output is coupled as one the tunnel and be transmitted into optical fiber link.
The detailed block diagram of said multiple light courcess RoF central station is as shown in Figure 6; It is characterized in that: the light source that multiple light courcess RoF central station is f0 by n centre frequency; Frequency be F1, F2 ..., Fn n radio frequency source, n double-sideband modulation device, n demodulation multiplexer; N is used for modulating the intensity modulator of wire user data, n intensity modulator and n multiplexer composition that is used for modulating wireless user data.Each light source produces corresponding light carrier, under the driving of each radio frequency source, carries out double-sideband modulation, thereby obtains n double-side band optical carrier.The spectrogram of the double-side band carrier signal that the i branch road carries out obtaining after the double-sideband modulation is shown in figure 11, and frequency is that the frequency interval between the centered carrier of f0 and two the single order sidebands that frequency is f1, f2 is the frequency value F i of i branch road radio frequency source.The double-side band carrier signal of each branch road is separated three different wavestrips by a demodulation multiplexer; Wherein intensity modulator of left side band f1 entering carries out intensity modulated under the driving of wireless user data i; Obtain light and carry rf wireless signal f1; Centered carrier f0 gets into another intensity modulator and under the driving of wire user data i, carries out intensity modulated; Obtain light and be loaded with line signal f0, the right band carrier signal f2, light carry rf wireless signal f1 and light and are loaded with line signal f0 and are incorporated into together by a multiplexer together then, obtain the signal of i branch road.The n road parallel signal of the n bar branch road that obtains at last, is exactly the output signal of multiple light courcess RoF central station.
The theory diagram of said OCDM encoder array is as shown in Figure 8, it is characterized in that: comprise n parallel OCDM encoder.The detailed block diagram based on the OCDM encoder array of fibre delay line that the present invention adopts is as shown in Figure 9.N light pulse signal after n the narrow light pulse that has a subscriber signal obtains encoding after through not isometric fibre delay line transmission; The chip period of code signal equates with narrow light pulse; The time slot position of chip determines by address code, and address code element " 0 " and " 1 " are respectively by the expression that has or not of this chip position light pulse.
Said ONU is characterized in that: the OCDM decoder; Be used for the light signal that receives is carried out corresponding decoding processing; Each ONU decodes to the light signal that receives with unique address code of distributing to oneself; Just can obtain direct needed signal, can't not steal other users' signal owing to there are other user's addresses sign indicating numbers simultaneously.Demodulation multiplexer is used for the different separate optical signals that send to wire user and wireless user are opened.Photodetector is used for the light signal that receives carried out that opto-electronic conversion obtains the corresponding signal of telecommunication and the signal of telecommunication that wire user is required directly sends to the wire user terminal.The RoF base station is used to receive light signal, OCDM decoding processing, photodetection, the ECDMA encoding process that optical fiber link sends and sends the wire/wireless signal to wired nothing/line user terminal respectively.
A corresponding branch road in the corresponding OCDM decoder array as shown in Figure 8 of OCDM decoder difference among said each ONU.The detailed block diagram based on the OCDM decoder array of fibre delay line that the present invention adopts is as shown in Figure 9.After the n that receives light pulse signal transmitted through the fibre delay line opposite with the encoder arrayed, the light signal of output was a decoded n light pulse signal, and this n light pulse signal just is sent to respectively among the corresponding ONU subsequently.
The detailed block diagram of said RoF base station is shown in figure 10, it is characterized in that: comprise photodetector, ECDMA encoder, electric amplifier and antenna.The right band carrier signal f2 that the RoF base station receives and light carry rf wireless signal f1 and directly get into photodetector together and carry out beat frequency; Thereby obtain carrying the radiofrequency signal of the required business of wireless user; Pass through the ECDMA coder processes again; By electric amplifier lower powered radiofrequency signal is amplified then, be transmitted in the air channel by antenna at last, wireless user terminal just can receive required radiofrequency signal like this.
Embodiment 2
The theory diagram of embodiment 2 of the present invention and detailed block diagram are respectively like Fig. 4 and shown in Figure 5, and its characteristic one of this embodiment is: OLT be used to produce light carrier, modulation wire/wireless subscriber signal, OCDM encoding process and will encode after n road light signal be coupled to and be transmitted into optical fiber link together.Optical fiber link is used to transmit the light signal of OLT emission.Image intensifer is used for the light signal that the amplifying fiber link transmits.ODN is used for the light signal that receives is divided into some branch roads and each branch road light signal is carried out decoding processing.A plurality of ONU are used to receive light signal, photodetection, the ECDMA coding that optical fiber link sends and send the wire/wireless signal to wired nothing/line user terminal respectively.Its characteristic two is: single light source RoF central station is as the part of OLT, and the RoF base station is as the part of ONU, and OCDM decoder array is arranged in ODN.
Said OLT comprises single light source RoF central station; 1 power light source produces the light carrier of 1 double-sideband modulation device; Wired light carrier with wireless traffic also is modulated on the corresponding light carrier with radio service data wired thereby this double-sideband modulation device carries out double-sideband modulation generation transmission under the driving of 1 radio frequency source, by 1 beam splitter the double-sideband signal that obtains is divided into n bar branch road at last; OCDM encoder array is used for encoding process is carried out in the narrow light pulse that has subscriber signal of single light source RoF central station output; Coupler is used for the light signal behind the multiplex coding of OCDM encoder array output is coupled as one the tunnel and be transmitted into optical fiber link.
The detailed block diagram of said single light source RoF central station is as shown in Figure 7; It is characterized in that: comprise that 1 centre frequency is the power light source of f0,1 frequency is the radio frequency source of F, 1 double-sideband modulation device; 1 beam splitter; N demodulation multiplexer, n is used for modulating the intensity modulator of wire user data, and n is used for modulating intensity modulator and n multiplexer of wireless user data.1 power light source produces the light carrier of 1 double-sideband modulation device; Wired light carrier with wireless traffic also is modulated on the corresponding light carrier with radio service data wired thereby this double-sideband modulation device carries out double-sideband modulation generation transmission under the driving of 1 radio frequency source, by 1 beam splitter the double-sideband signal that obtains is divided into n bar branch road at last.The double-side band carrier signal of each branch road is respectively f1 by a demodulation multiplexer with centre frequency; Three different wavestrips of f0 and f2 are separated; Wherein intensity modulator of left side band f1 entering carries out intensity modulated under the driving of wireless user data i; Obtain light and carry rf wireless signal f1, centered carrier f0 gets into another intensity modulator and under the driving of wire user data i, carries out intensity modulated, obtains light and is loaded with line signal f0; The right band carrier signal f2, light carry rf wireless signal f1 and light and are loaded with line signal f0 and are incorporated into together by a multiplexer together then, obtain the signal of i branch road.The n road parallel signal of the n bar branch road that obtains at last, is exactly the output signal of single light source RoF central station.
The theory diagram of said OCDM encoder array is as shown in Figure 8, comprises n parallel OCDM encoder.The detailed block diagram based on the OCDM encoder array of fibre delay line that the present invention adopts is as shown in Figure 9.N light pulse signal after n the narrow light pulse that has a subscriber signal obtains encoding after through not isometric fibre delay line transmission; The chip period of code signal equates with narrow light pulse; The time slot position of chip determines by address code, and address code element " 0 " and " 1 " are respectively by the expression that has or not of this chip position light pulse.
Said ODN comprises decoupler, is used for the light signal that receives is divided into the n road and directly sends into OCDM decoder array; OCDM decoder array is used for the n road that has subscriber signal and the traveling optical signal that receive are carried out decoding processing.
The theory diagram of said OCDM decoder array is as shown in Figure 8, comprises n parallel OCDM decoder.The detailed block diagram based on the OCDM decoder array of fibre delay line that the present invention adopts is as shown in Figure 9.After the n that receives light pulse signal transmitted through the fibre delay line opposite with the encoder arrayed, the light signal of output was a decoded n light pulse signal, and this n light pulse signal just is sent to respectively among the corresponding ONU subsequently.
Said ONU comprises: demodulation multiplexer is used for the different separate optical signals that send to wire user and wireless user are opened; Photodetector is used for the light signal that receives carried out that opto-electronic conversion obtains the corresponding signal of telecommunication and the signal of telecommunication that wire user is required directly sends to the wire user terminal; The RoF base station is used for that the light that receives is carried rf wireless signal and carries out opto-electronic conversion, ECDMA encoding process and amplify the back through electric amplifier being transmitted into wireless user terminal by antenna.
The detailed block diagram of said RoF base station is shown in figure 10, comprises photodetector, ECDMA encoder, electric amplifier and antenna.The right band carrier signal f2 that the RoF base station receives and light carry rf wireless signal f1 and directly get into photodetector together and carry out beat frequency; Thereby the rf frequency that obtains carrying the required business of wireless user is the wireless signal of 2F; Pass through the ECDMA coder processes again; By electric amplifier lower powered radiofrequency signal is amplified the back then and be transmitted in the air channel by antenna, wireless user terminal just can receive required radiofrequency signal like this.
The spectrogram of the double-side band carrier signal that the i branch road carries out obtaining after the double-sideband modulation in the said RoF central station is shown in figure 11; Comprise that frequency is the centered carrier of f0, frequency is that three frequency components are with on the left side band of f1=f0-Fi and the right that frequency is f2=f0+Fi.The peak power of these three frequency components is all about-20dBm, and the peak power of other high-order sidebands that produce than double-sideband modulation exceeds more than 20 dB.
Beneficial effect of the present invention
The RoF technology is combined closely with the PON technology, realized the seamless fusion of cable business and wireless traffic; Adopt the OCDM access technology at optical fiber link; Significantly strengthened antijamming capability and the security performance of fused business in the optical fiber link transmission; Let the multiple business can shared channel, enlarged the capacity of system, also reduced system to synchronous requirement simultaneously; And have fair allocated bandwidth mechanism, networking flexibility; Adopt the ECDMA technology at Radio Link, strengthened antijamming capability and the security performance of wireless traffic in transmission of radio links; Can use the radio frequency source of different frequency to make different users obtain the wireless signal of different radio frequency frequency at the OLT end according to wireless user's demand; Two kinds of concrete execution modes are provided, can have adapted to the application of different requirements occasion; Be prone on existing 3G infrastructure, carry out corresponding upgrading, can reduce universal construction cost greatly.
Although above the illustrative embodiment of the present invention is described; So that the technical staff in present technique field understands the present invention, but should be clear, the invention is not restricted to the scope of embodiment; To those skilled in the art; As long as various variations appended claim limit and the spirit and scope of the present invention confirmed in, these variations are conspicuous, all utilize innovation and creation that the present invention conceives all at the row of protection.
Claims (10)
1. one kind based on Optical Code Division Multiplexing (OCDM) optical-fiber wireless RoF passive optical network, and its characteristic one is: comprise that code divides multiple access (ECDMA) coding in double-sideband modulation and intensity modulated in light carrier radio communication (RoF) central station, light source, radio frequency source, OCDM coding, coupling, Optical Fiber Transmission, de, OCDM decoding, photodetection, the RoF base station, tele-release is big and the antenna emission is formed.Its characteristic two is: the RoF central station is as a part of optical line terminal (OLT), and OCDM encoder array is arranged in OLT.Its characteristic three is: the RoF base station is as a part of optical network unit (ONU), and the OCDM decoder lays respectively among each ONU.
A kind of based on OCDM optical-fiber wireless RoF EPON implementation method, its concrete performing step is:
The 1st step: centre frequency is that the LASER Light Source of f0 is that the radio frequency source excitation of F is carried out double-sideband modulation down in frequency, thereby the generation frequency is respectively three carrier components of f1=f0-F, f0 and f2=f0+F;
The 2nd step: the frequency that double-sideband modulation is obtained with a demodulation multiplexer is respectively three carrier components of f1, f0 and f2 and separates; Each road wire user data is modulated to respectively on the corresponding f0 carrier component; Each road wireless user data is modulated to respectively on the corresponding f1 carrier component; Frequency is that the carrier component of f2 is left intact, and is that frequency that f1, f0 and not have modulates is that three road signal multiplexings of f2 are to together with the frequency after the signal modulation again by a multiplexer at last;
The 3rd step: unique OCDM address code of giving each user according to system assignment; The mixed signal that obtains after utilizing the OCDM encoder to intensity modulated is carried out the OCDM coding; Thereby the OCDM code signal that the n road that obtains is parallel is coupled as one the tunnel with the coupler OCDM code signal that this n road is parallel again;
The 4th step: just be transmitted directly in the fiber channel after the parallel OCDM code signal in n road is coupled as one tunnel by coupler; Earlier be transferred to optical distribution network (ODN) from OLT; Be used for the light signal of having decayed is amplified to each ONU, image intensifer signal allocation by ODN again;
The 5th step: be coupled as one tunnel OCDM code signal and be divided into n by the decoupler that is positioned at ODN place and restraint; Send to n corresponding ONU respectively; Each ONU need carry out the OCDM decoding processing to the light signal that receives, thereby extract required light signal in order to obtain the signal that OLT sends oneself to;
The 6th step: through the light signal after the OCDM decoding processing is that three signal components of f1, f0 and f2 are separated by a demodulation multiplexer with frequency earlier; The frequency of carrying wired user data is that the signal component of f0 directly gets into photodetector and carries out opto-electronic conversion; Thereby obtain the required data of wire user and directly send to the wire user terminal; The frequency of carrying wireless user data is that the signal component of f1 and the frequency that does not have modulation signal are that the carrier component of f2 gets into photodetector in the RoF base station together and carries out beat frequency and handle, and is the wireless signal of 2F thereby obtain the required rf frequency of wireless user;
The 7th step: the beat frequency through photodetector in the RoF base station is handled the required radiofrequency signal of wireless user that can obtain; According to the ECDMA address code of distributing to the different radio user radiofrequency signal is carried out the ECDMA encoding process again, thereby guarantee only to have the wireless signal that wireless user that authority promptly has corresponding ECDMA address code could correctly decode and receive demand;
The 8th step: the radiofrequency signal behind the process ECDMA coding is amplified to by an electrical power amplifier and is fit to be transmitted directly in the air channel by antenna after the antenna emitted power level, and wireless user terminal only need carry out decoding processing according to the ECDMA address code of distributing to oneself in certain distance range just can successfully receive required wireless signal.
2. according to claim 1 based on OCDM optical-fiber wireless RoF passive optical network; Its characteristic also is: the multiple light courcess RoF central station among the said OLT; Use n light source to produce and transmit light carrier wired and wireless traffic, n double-sideband modulation device is being modulated to respectively on the corresponding light carrier with radio service data wired under the driving of n radio frequency source; OCDM encoder array is used for encoding process is carried out in the narrow light pulse of carrying subscriber signal of RoF central station output; Coupler is used for the light signal behind the multiplex coding of OCDM encoder array output is coupled as one the tunnel and be transmitted into optical fiber link.
3. according to claim 1 based on OCDM optical-fiber wireless RoF passive optical network, its characteristic also is: said ONU comprises that the OCDM decoder is used for the light signal that receives is carried out decoding processing; Demodulation multiplexer is used for the different separate optical signals that send to wire user and wireless user are come; The RoF base station is used for that the light that receives is carried rf wireless signal and carries out opto-electronic conversion, ECDMA coding and amplify the back through electric amplifier being transmitted into wireless user terminal by antenna; Photodetector is used for the wired light signal that receives is carried out opto-electronic conversion and sends the wire user terminal to.
4. according to claim 1 based on OCDM optical-fiber wireless RoF passive optical network, its characteristic also is: single light source RoF central station is by 1 power light source, and 1 double-sideband modulation device and 1 radio frequency source and 1 beam splitter are formed.
5. according to claim 1 based on OCDM optical-fiber wireless RoF passive optical network, its characteristic also is: said ODN comprises: decoupler is used for the light signal that receives is divided into some branch roads; OCDM decoder array is used for each the branch road light signal after the de is carried out decoding processing.
According to claim 1 with 5 described based on OCDM optical-fiber wireless RoF passive optical network, its characteristic also is: the OCDM decoder that is arranged in each ONU is put into ODN with the form of array, and OLT links to each other with a plurality of first ONU through ODN.
7. according to claim 1 based on OCDM optical-fiber wireless RoF passive optical network; Its characteristic also is: said single light source RoF central station; 1 power light source produces the light carrier of 1 double-sideband modulation device; Wired light carrier with wireless traffic also is modulated on the corresponding light carrier with radio service data wired thereby this double-sideband modulation device carries out double-sideband modulation generation transmission under the driving of 1 radio frequency source, by 1 beam splitter the double-sideband signal that obtains is divided into n bar branch road at last; OCDM encoder array is used for encoding process is carried out in the narrow light pulse that has subscriber signal of RoF central station output; Coupler is used for the light signal behind the multiplex coding of OCDM encoder array output is coupled as one the tunnel and be transmitted into optical fiber link.
8. according to claim 1 based on OCDM optical-fiber wireless RoF passive optical network, its characteristic also is: ONU comprises wired and wireless user terminal, receives wired respectively and wireless signal.
9. described based on OCDM optical-fiber wireless RoF passive optical network with 8 according to claim 1, its characteristic also is: wireless user terminal comprises antenna and ECDMA decoder.
10. according to claim 1,2,3,5,6 and 7 described based on OCDM optical-fiber wireless RoF passive optical network, its characteristic also is: said OCDM coder/decoder has adopted the fibre delay line coder/decoder.
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