CN103051385A - Integral wired-wireless optical fiber asymmetric full-duplex access method and system - Google Patents
Integral wired-wireless optical fiber asymmetric full-duplex access method and system Download PDFInfo
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Abstract
The invention discloses an integral wired-wireless optical fiber asymmetric full-duplex access method and system. A light with the frequency being f0 is divided into two beams; one beam is modulated by a high-speed QAM (Quadrature Amplitude Modulation) millimeter-wave signal single side band with the frequency being fRF to generate a light carrier OLO1 (Optical Line Output 1) and a signal side band BBD with same polarization; and the other beam is inhibited and modulated by a local oscillator carrier with the frequency being fRF to generate an OLO2 with the same frequency as the BBD, after the OLO2 is orthogonal and combined with the OLO1, excess optical frequency components are filtered, and a downward infusion optical signal is generated. The infusion optical signal is transmitted to a base station through optical fiber, and can provide wired or wireless access. When the base station is accessed in a wired manner, a wavelength interpolation device separates the OLO2, the BBD from the OLO1, the OLO2 is subjected to coherent demodulation so as to obtain a downlink baseband signal, and the OLO1 carries an uplink low-speed signal and is back to a central station through the optical fiber; and when the base station is wirelessly accessed, a polarization beam splitter separates the OLO1, the BBD and the OLO2, the OLO1 is an optical millimeter-wave signal and is converted to electrical millimeter-wave through a photoelectric detector, and the OLO2 carries an uplink low-speed millimeter-wave signal and is back to the central station through the optical fiber, so that wired or wireless asymmetric full-duplex access is realized.
Description
Technical field
The present invention relates to optical communication and millimeter wave wireless access communication field, relate in particular to utilize the long Distance Transmission of optical communication technique based on PON wired/ fusion light signal that ROF is wireless, realize that the wire/wireless of full duplex merges hybrid access method and the system of signal.
Background technology
Optical fiber radio frequency transmission (Radio-over-Fiber, RoF) technological incorporation the characteristics of optical fiber communication and radio communication, both had the large bandwidth, low-loss, anti-electromagnetic interference of optical fiber communication, the advantage of long Distance Transmission, possess again the flexible access characteristics that radio communication is not subjected to the geographical position limitation, for the terminal use provides large capacity high data rate and convenient, flexible access way.EPON (PassiveOptical Networks based on the optical fiber access, PON) realized device passive between local side and the user side, equipment cost is low, maintenance is simple, be subjected to the electromagnetism thunder and lightning disturb little, resource occupation is few, is the main potentiality solution of the following FTTx of realization.RoF and PON are respectively the solutions of the tool potentiality of WiMAX access and access in radio, but the two independent dispose expensive respectively, so that they are difficult to realize commercialization at present.Mixing based on PON/RoF is wired/Radio Access Network, not only can realize the fusion of wire/radio network, the simplified network structure, reduce cost, and can provide wired or wireless selection access according to user's request, satisfied to a great extent the demand trend of the large volume transport of future network, flexible access.
Mixing based on PON/RoF is wired/the pertinent literature report of wireless access technology in, most of implementation cores are based on wavelength-division multiplex technique, adopt the different frequency wavelength to realize respectively modulation and the transmission of wire/wireless signal, just simple the merging transmits for wire signal wherein and wireless signal, separate, respectively transmission, wired and Radio-over-fiber link and network have been realized sharing, but it is separate to send out receipts module majority, the fusion degree is lower, the bandwidth resources of wired and wireless access generally can only static allocation, can't realize optical fiber distribution network resource and the dynamic allotment of spectrum resource and taking full advantage of of fiber bandwidth resource.
If the mixing based on PON/RoF were wired/signal emission, receiver module in the Radio Access Network, transmission channel and switching node are all realized organically blending, equipment and resource are fully shared, further simplified network structure, make network more energy-efficient, can also reduce base station and central station complexity, the dynamic high-efficiency of realizing network bandwidth resources distributes, make broadband cabled-wireless mixed insertion network have more advantage, can satisfy better people to the variation of information service and the demand of bandwidth.
Summary of the invention
For solve band resource utilance in the above-mentioned wire/wireless mixed insertion network low with mixed insertion network in the mutual discrete system exception challenge that makes of wired, wireless device, the present invention proposes the asymmetric full duplex cut-in method of optical fiber and the system that a kind of new wire and wireless merges.
The present invention proposes the asymmetric full duplex cut-in method of optical fiber that a kind of wire and wireless merges, can realize that base band and millimeter wave merge the long Distance Transmission of light signal and optionally wire/wireless access by optical fiber, and do not need to arrange light source in the base station, make its designs simplification.Consider that the upstream data flow rate is generally lower than downstream data flow in the practical application, asymmetric Uplink/Downlink proposed by the invention has more simple structure and lower realization cost.It comprises,
In the downlink transmission module of central station, frequency is f
0Laser send continuous light wave and be incident to polarization beam apparatus, be same frequency constant power light wave L1 and the L2 of two-way polarized orthogonal by beam splitting, L1 and L2 are incident to respectively Mach-Zehnder modulator 1 and Mach-Zehnder modulator 2 is modulated; Its medium frequency is f
RFRadiofrequency signal bearing downlink data after, as the driving of Mach-Zehnder modulator 1, realize the single-side band modulation to light wave L1, output frequency is f
0Centered carrier OLO1 and carry downlink data, frequency is for (f
0+ f
RF) single order sideband BBD; Frequency is f
RFLocal oscillation signal drive Mach-Zehnder modulator 2, realize the centered carrier of L2 is suppressed modulation, the generation frequency is (f
0± f
RF) two single order sidebands, its medium frequency is (f
0+ f
RF) sideband be OLO2, frequency is (f
0-f
RF) sideband be OLO3, polarization beam combiner realizes that the polarized orthogonal of two Mach-Zehnder modulators output closes the road, the band pass filter rejection frequency is (f
0-f
RF) single order sideband OLO3 and other high-order sidebands, frequency is f
0OLO1 and frequency be (f
0+ f
RF) BBD, OLO2 pass through, three road light waves of these two frequency contents have consisted of down link and have merged light signal, wherein OLO1 and BBD polarization parallel and frequency interval are f
RF, OLO2 and polarized orthogonal identical with the BBD frequency; The fusion optical signals erbium-doped fiber amplifier of down link is amplified to suitable power, transfers to the base station through monomode fiber; In the down link access in radio receiver module of base station, wavelength interleaves filter and realizes that down-link frequencies is f
0+ f
RFOLO2 and BBD and frequency be f
0OLO1 separate, frequency OLO2 identical and polarized orthogonal separates through polarization beam apparatus with BBD, coherent demodulation obtains descending access in radio signal, its medium frequency is f
0OLO1 reserve light carrier as up link; In the access in radio up link, light intensity modulator in the transmitter module in the base station with binary upstream data. signals intensity modulated to the up light carrier OLO1 that reserves, and by the uplink optical fibers link transmission to central station, the photodetector of the access in radio up link receiver module of central station is converted into binary base electrical signal; In downlink wireless access receiver module, polarization beam apparatus merges down link with light signal, and to be separated into the frequency that comprises OLO1 and BBD be f
RFLight carry millimeter-wave signal and frequency is f
0+ f
RFUp link light carrier OLO2, wherein light carries millimeter-wave signal to be converted to frequency by photodetector is f
RFElectric millimeter-wave signal, after bandpass filtering and power amplification by antenna transmission to the wireless interface receiving end, realize the wireless access of downstream signal; In the wireless access up link, the antenna reception in the base station to frequency be f
U, the up electric millimeter-wave signal single-side band modulation that carrying the binary intensity modulating data is to the up link light carrier OLO2 that reserves, to central station, uplink optical signal is converted to the signal of telecommunication with the high-speed photodetector of central station and demodulation obtains binary base band upward signal through the uplink optical fibers link transmission; Above-mentioned up link and down link have realized merging the full duplex transmission of light signal, have consisted of full-duplex link.
As a kind of method for optimizing, in the downlink transmission module, downlink data signal is the higher M system Vector Modulation signal of spectrum efficiency; The lithium niobate Mach-Zehnder modulator that adopts 1 realize the single-side band modulation of one road continuous laser, Mach-Zehnder modulator 2 realizes that the centered carrier of another road cross-polarization laser suppresses modulation, the local oscillation signal frequency is identical with the down link millimeter-wave frequency; The filter rejection frequency is (f
0-f
RF) single order sideband and other high-order sideband compositions, down link merges light signal and comprises that frequency is (f
0+ f
RF) light carrier OLO2 and carry the BBD of downlink data information, and frequency is f
0Carrier wave OLO1, BBD but polarized orthogonal identical with the OLO2 frequency wherein, BBD and OLO1 polarization parallel and frequency interval are f
RF, it is simple that the optical signal frequency composition is merged in base station output, and it is little affected by optical fiber dispersion.
As a kind of method for optimizing, in down link access in radio receiver module, it is f with frequency that the wavelength of base station interleaves optical filter
0+ f
RFBBD and OLO2, with frequency be f
0Up-link carrier OLO1 separate, BBD enters coherent optical heterodyne communicatio with OLO2 after cross-polarization separates, coherent optical heterodyne communicatio is made of Polarization Controller, four input port light hybrid blenders and two pairs of balance photodetectors, realize the coherent demodulation of descending wire signal, to obtain the access in radio signal of base band.
As a kind of method for optimizing, in the access in radio up link, the light intensity modulator in the access in radio uplink transmit module in the base station is f with the wired upstream data. signals intensity modulated of binary system in frequency
0Up light carrier OLO1 on, the upward signal of access in radio to central station, is converted into base electrical signal by photodetector in the access in radio up link receiver module in the central station through ul transmissions.
As a kind of method for optimizing, in downlink wireless access receiver module, polarization beam apparatus is f with the downlink data frequency of carrying of polarized orthogonal
RFLight carry millimeter-wave signal and frequency is f
0+ f
RFUp-link carrier OLO2 separate, wherein to carry millimeter-wave signal be f by frequency to light
0+ f
RFThe BBD that carries downlink data and frequency be f
0OLO1 consist of, the two polarization parallel, light carries millimeter-wave signal and is not less than f through response frequency
RFPhotodetector be converted to electric millimeter-wave signal, be emitted to user's incoming end by antenna wireless after the power amplification.
As a kind of method for optimizing, in the wireless access up link, be f by the frequency of the antenna reception in the base station
U, the up electric millimeter wave that carrying the binary intensity modulation signal is f by the light intensity modulator single-side band modulation in the wireless access uplink transmit module to the frequency of reserving
0+ f
RFUp-link carrier OLO2, the generation frequency is f
0+ f
RF-f
UModulation sideband, (carrying upward signal), light carrier and modulation sideband, by the uplink optical fibers link transmission to central station, being converted to frequency through photodetector is f
UThe signal of telecommunication, and be baseband signal in the coherent demodulation of electric territory.
The asymmetric full duplex wire/wireless mixed access system that the invention provides based on PON and ROF comprises:
System is made of the asymmetric full duplex transmission link between central station, base station and central station and base station, wherein central station comprises downlink transmission module, wire/wireless up link receiver module, the wireless access base station comprises downlink wireless receiver module and radio up-line transmitter module and duplexed antenna, the access in radio base station comprises the wired receiver module of down link and wired uplink transmit module, and the full duplex transmission link between central station and base station comprises up link and down link:
Described downlink transmission module, in order to produce PON wired/RoF wireless fusion light signal, its main devices comprises continuous wave laser, polarization beam apparatus, lithium niobate Mach-Zehnder modulator, polarization beam combiner and band pass filter; It is f that described laser sends centre frequency
0Continuous laser; Described polarization beam apparatus is the two-way of polarized orthogonal with the incident laser beam splitting, and is injected into respectively two lithium niobate Mach-Zehnder modulators; Described lithium niobate Mach-Zehnder modulator 1 is through loading the frequency f of downlink data signal
RFRadio frequency signals drive, the single-side band modulation continuous laser produces the single order sideband BBD comprise centered carrier OLO1 and to carry downlink data, its frequency is respectively f
0(f
0+ f
RF); Described lithium niobate Mach-Zehnder modulator 2 is in frequency f
RFRadio-frequency (RF) local oscillator drive the lower optical carrier suppression modulation that realizes, the generation frequency is (f
0± f
RF) two single order sidebands, its medium frequency is (f
0+ f
RF) light wave be OLO2; Described polarization beam combiner closes the road with the output orthogonal of two-way lithium niobate Mach-Zehnder modulator; Described band pass filter rejection frequency is (f
0-f
RF) sideband and other high-order sidebands, the down link of output merges light signal and comprises that frequency is f
0OLO1 and frequency be f
0+ f
RFBBD and OLO2;
Described down link access in radio receiver module, in order to the coherent reception that realizes descending fusion light signal, the extraction of separating the up light carrier of mediation, its main devices comprises that wavelength interleaves optical filter, polarization beam apparatus and coherent optical heterodyne communicatio; Described wavelength interleaves optical filter and finishes frequency for (f in the access in radio base station
0+ f
RF) OLO1 and BBD and frequency be f
0The separation of up-link carrier OLO2; Described polarization beam apparatus separates same frequency OLO1, the BBD of polarized orthogonal; Described coherent optical heterodyne communicatio comprises Polarization Controller, four port optical hybrid and two pairs of balance photodetectors, in order to realize the coherent demodulation of downlink data;
Described downlink wireless access receiver module, carry millimeter-wave signal and opto-electronic conversion is electric millimeter-wave signal in order to the light of isolating descending fusion light signal, extract simultaneously up light carrier, its main devices comprises polarization beam apparatus, photodetector, band pass filter and transmitting antenna; Described polarization beam apparatus separates the optical millimeter wave signal of polarized orthogonal in the wireless access base station with up-link carrier; Described photodetector is converted to electric millimeter wave with optical millimeter wave; Described band pass filter is f with frequency
RFElectric millimeter wave leach; Described antenna realizes that electric millimeter wave is emitted to user's receiving terminal;
Described up link access in radio transmitter module, in order to the light modulation of the uplink signal of realizing access in radio, its main devices is light intensity modulator; Described light intensity modulator is modulated to the up light carrier of reservation with binary base band upward signal, as the base station output of access in radio up link;
Described up link access in radio receiver module is converted to the signal of telecommunication in order to the light signal of realizing wired up link, and its main devices is photodetector; Described photodetector is the signal of telecommunication with the uplink optical signal opto-electronic conversion, and demodulation obtains wired upstream data;
Described uplink radio access transmitter module, in order to realize up electric millimeter-wave signal to the modulation of up light carrier, its main devices is light intensity modulator; Described in the wireless access base station, the up electric millimeter-wave signal single-side band modulation that light intensity modulator receives antenna for base station is in up light carrier, as the base station output of wireless access up link;
Described uplink radio access receiver module is the signal of telecommunication in order to the light signal that receives radio up-line and with its opto-electronic conversion, and its main devices is high-speed photodetector; The light signal of described up link is converted to the signal of telecommunication through photodetector, further is demodulated into binary baseband signal in electric territory;
Transmission link between described central station and base station, in order to finishing the full duplex transmission of uplink and downlink signal, it mainly is made of optical fiber and the erbium-doped fiber amplifier that is used for the compensated optical signal attenuation loss.
Adopt technical scheme provided by the invention, two lithium niobate Mach-Zehnder modulators are realized respectively the light carrier modulation of two-way polarized orthogonal; Three road light waves of two frequency contents of fusion optical signals of down link consist of, orthogonal polarisation state realize PON wired the RoF wireless signal effective integration and in optical fiber, transmit, improve the availability of frequency spectrum, simplify spectrum structure; Data signal modulation is carried in the frequency content of millimeter wave in double frequency light in the down link, has reduced optical fiber dispersion to the deteriorated impact that wire/wireless merges light signal, has got rid of the necessity of dispersion compensation, has increased the transmission range of light signal; Descending fusion light signal can realize wired the access of wireless selectivity, the flexibility that has improved the base station access way; Up light carrier need not the unnecessary light source in base station by directly extracting in the down link; Up link adopts binary data intensity modulated or single-side band modulation in up light carrier, and receiving terminal adopts the non-coherent demodulation mode can obtain upstream data information, has simplified uplink structure.Compare the vector signal of downlink transmission M system, the ul transmissions data rate is lower, and occupied bandwidth is less, consists of asymmetric full-duplex link with down link.
Adopt after the technical scheme of this patent, can realize base station PON wired/access of the selectivity of ROF wireless signal, realize base station passive, finish wire/wireless and merge the long Distance Transmission of the optical fiber of light signal between central station and base station, Uplink/Downlink asymmetric data speed rates, the Effective Raise availability of frequency spectrum reduces optical fiber dispersion to the impact of transmitting optical signal, reduces cost.
Description of drawings
Figure 1 shows that the full duplex PON based on cross-polarization that the present invention announces wired/ROF wireless signal mixing access link schematic diagram, here with f
0=193.1THz, f
RF=20GHz, f
U=22GHz is example.
Fig. 2 is the spectrogram that OLO1, OLO2 and BBD three tunnel merges light signals among the present invention, and (a) position records among Fig. 1.
Fig. 3 is that base station access in radio scheme wavelength interleaves filter and isolates OLO2 and the BBD that frequency is 193.12THz among the present invention, and (b) position records among Fig. 1.
Fig. 4 is EVM figure and the planisphere (fiber lengths is 0km, 40km, EVM ≈ 7.5%) that base station access in radio scheme OLO2 and BBD coherent demodulation obtain downlink data among the present invention.
Fig. 5 is that access in radio scheme in base station interleaves optical filter by wavelength and isolates the up-link carrier spectrogram that frequency is 193.10THz among the present invention, and (e) position records among Fig. 1.
Fig. 6 is the spectrogram of access in radio scheme up-link carrier after the modulation of binary system upstream data among the present invention, and (f) position records among Fig. 1.
Fig. 7 is that the demodulation of access in radio scheme central station obtains the BER curve chart of upstream data and eye pattern (fiber lengths is 0km, 40km, BER ≈ 10 among the present invention
-9).
Fig. 8 is that to isolate frequency by polarization beam apparatus in the base station radio access scheme among the present invention be that the light of 20GHz carries the millimeter-wave signal spectrogram and opto-electronic conversion is the spectrogram of electric millimeter-wave signal, respectively in Fig. 1 (g) and (h) position record.
Fig. 9 is EVM figure and the planisphere (fiber lengths is 0km, 40km, EVM ≈ 9.5%) that the radio access scheme demodulation obtains downlink data among the present invention.
Figure 10 is that the frequency that obtains by the polarization beam apparatus separation in the radio access scheme among the present invention is 193.12THz up-link carrier spectrogram, and (i) position records among Fig. 1.
Figure 11 be among the present invention in the radio access scheme upstream data information single-side band modulation be the spectrogram of 193.12THz up-link carrier in frequency, (j) position records among Fig. 1.
Figure 12 is that the radio access scheme demodulation obtains the BER curve chart of upstream data and eye pattern (fiber lengths is 0km, 40km, BER ≈ 10 among the present invention
-7).
Embodiment
The invention provides the asymmetric full duplex cut-in method of optical fiber that a kind of wire and wireless merges, be used for the central station generation based on the fusion light signal of cross-polarization, finish base station wire/wireless selectivity access way, up-link carrier is by directly extracting in the down link, realize base station passive, lower/upper line link transmits respectively M system vector/binary data speed, form asymmetric full-duplex link, the reasonable distribution frequency spectrum resource, reduce cost, improve realizability, for realizing above-mentioned steps, need to adopt following steps:
The downlink transmission module: in central station, angular frequency is ω
0=2 π f
0Narrow linewidth laser send continuous light wave, laser frequency f wherein
0=193.1THz (1552.5nm), live width 10MHz is example, is incident to light wave L1 and L2 that polarization beam apparatus is separated into constant power cross-polarization, is incident to respectively half-wave voltage and is the lithium niobate Mach of 4V-increase moral modulator 1 (LiNbO
3Mach-Zehnder modulator1, LN-MZM1) and potassium niobate Mach-increase moral modulator 2 (LN-MZM2).Wherein the 10Gbit/s binary data stream by planisphere mapping and pulse-shaping be the 16-QAM vector signal of 2.5Gbaud as the downgoing baseband signal, be f in frequency
RF=20GHz, peak-to-peak value are under the radio-frequency (RF) local oscillator signal driver LN-MZM1 of 3.0V, and to the L1 single-side band modulation, output frequency is f
0The centered carrier OLO1 of=193.1THz is f with the frequency of carrying downlink data information
0+ f
RFThe single order optical sideband BBD of=193.12THz.L2 is incident to LN-MZM2, is f in frequency
RF=20GHz, peak-to-peak value are to realize the optical carrier suppression modulation under the radio-frequency (RF) local oscillator signal driver of 4.0V, and the generation frequency is f
0+ f
RF=193.12THz+1 rank sideband OLO2 and frequency are f
0-f
RF-1 rank sideband OLO3 of=193.08THz.Polarization beam combiner realizes that two LN-MZM output polarizations close the road.Centre frequency is 193.11THz, bandwidth is that the Gauss light filter of 25GHz is sideband and other high-order suppress sidebands of 193.08THz with frequency, the output down link merges light signal, comprises BBD, OLO2 that OLO1 that frequency is 193.1THz and frequency are 193.12THz, and frequency spectrum as shown in Figure 2.Wherein OLO1 and BBD polarization parallel but frequency interval is f
RF=20GHz, OLO2 but polarized orthogonal identical with the BBD frequency.Merge light signal as the output of base station, transfer to the base station through monomode fiber.
In the downlink transfer link: consisted of by monomode fiber, will merge the optical signals central station and transfer to the base station.Wherein the optical fiber chromatic dispersion is 16.75ps/nmkm, and power loss is 0.2dB/km, and chromatic dispersion gradient is 0.075ps/nm
2Km, group delay is 0.2ps/km.Because the downlink data single-side band modulation in the fusion light signal is in light carrier, it is very little therefore to be subject to the impact of optical fiber chromatic dispersion.
The wired receiver module of down link: descending fusion light signal interleaves optical filter by wavelength and isolates as shown in Figure 3 that frequency is f
0+ f
RFLight wave BBD, the OLO2 of=193.12THz, and frequency is f as shown in Figure 5
0The up-link carrier OLO1 of=193.10THz.BBD and OLO2 are with frequently but polarized orthogonal, and polarization beam apparatus is with the two polarization separation, and coherent demodulation obtains the downgoing baseband data-signal through coherent optical heterodyne communicatio.Wherein coherent optical heterodyne communicatio is comprised of Polarization Controller, light hybrid and two pairs of balance photo-detectors.The downstream signal EVM curve that demodulation obtains and planisphere (fiber lengths is 0km, 40km, EVM ≈ 7.5%) are as shown in Figure 4.
The access in radio up link: in the base station, it is f that the upper row binary NRZ signal of 5Gb/s is modulated to frequency through intensity modulator
0Among the up-link carrier OLO1 of=193.10THz, as shown in Figure 8, to central station, the photodetector in the central station realizes that the up link light signal is to the conversion of the signal of telecommunication through the uplink optical fibers link transmission.(fiber lengths is 0km, 40km, BER ≈ 10 for the BER curve of access in radio up link restituted signal and eye pattern
-9) as shown in Figure 7.
The downlink wireless receiver module: it is f that descending fusion light signal is isolated frequency by polarization beam apparatus
RF=20GHz by OLO1, BBD consist of light carry millimeter-wave signal (as shown in Figure 8) and frequency is f
0+ f
RF=193.12THz up-link carrier OLO2 (as shown in figure 10).OLO1 and BBD polarization parallel, response frequency is not less than f
RFThe photodetector of=20GHz carries millimeter-wave signal with light, and to be converted to frequency be f
RF=20GHz the signal of telecommunication (frequency spectrum as shown in Figure 8) directly links to each other with user side.The descending demodulated base band signal EVM curve that is obtained by the local oscillator coherent demodulation of 20GHz and planisphere (fiber lengths is 0km, 40km, EVM ≈ 9.5%) are as shown in Figure 9.
The wireless access up link: the frequency of antenna reception is f
UThe electric millimeter-wave signal of=22GHz carries the binary data signal of 5Gb/s, is not less than f through response frequency
UThe optical modulator single-side band modulation be f in frequency
0+ f
RFOn the up-link carrier OLO2 of=193.12THz, the generation frequency is f
0+ f
RF-f
UThe modulation sideband, of=193.098THz, as shown in figure 11.Carrier wave and modulation sideband, transfer to central station as the output of base station through uplink optical fibers, and frequency is not less than f
UThe photodetector of=22GHz is realized the opto-electronic conversion of upward signal, and demodulation obtains upstream data. signals.(fiber lengths is 0km, 40km, BER ≈ 10 for the BER curve of the upward signal that the demodulation of wireless access up link obtains and eye pattern
-7) as shown in figure 12.
The asymmetric full duplex cut-in method of optical fiber and system that wire and wireless of the present invention merges have following beneficial effect:
(1) central station adopts two-way lithium niobate Mach-Zehnder modulator, realize respectively the modulation of two-way cross-polarization continuous laser, produce PON wired/ fusion light signal that RoF is wireless, simplified the structure that merges the light signal generating module, improved the availability of frequency spectrum, simple spectrum structure makes the transmission performance that merges light signal be subjected to the impact of optical fiber dispersion very little;
(2) down link adopts the PON of consolidation form wired/RoF wireless fusion light signal, provides the base station wire/wireless alternative access, has increased the access of base station, satisfies better different access way users' demand;
(3) the up link light carrier can extract from descending fusion light signal, need not additional light source, has realized the passive of base station, has simplified architecture of base station, has reduced cost;
(4) downlink transmission M system vector data signal improves downlink rate by high order modulation; Up link adopts binary data signal, and receiving terminal adopts non-coherent demodulation to get final product demodulation upstream data information, simplicity and the detectivity requirement of up link have been guaranteed, this Uplink/Downlink asymmetry, meet the at present requirement of many access users of taking as the leading factor with Download Info, can take full advantage of frequency spectrum resource simultaneously.
In sum, the present invention utilizes two-way lithium niobate Mach-Zehnder modulator respectively the two-way continuous laser of polarized orthogonal to be modulated, and produces the fusion light signal that comprises two frequency content three road light waves, has simplified spectrum component, has increased the availability of frequency spectrum; The selection access that wire/wireless is realized in the base station has improved the access of base station, has satisfied user's different demands; Adopt the gauge without light source base station to simplify architecture of base station, reduced cost; Uplink downlink adopts respectively the asymmetric full-duplex link of 16-QAM and binary modulated form, has rationally utilized frequency spectrum resource, has reduced cost, has increased the practicality of this full duplex RoF link.
Claims (7)
1. the asymmetric full duplex cut-in method of optical fiber that wire and wireless merges is characterized in that it comprises the steps:
In the downlink transmission module of central station, frequency is f
0Laser send continuous light wave and be divided into light wave L1 and the L2 of two-way polarized orthogonal by polarization beam apparatus, and be incident to respectively Mach-Zehnder modulator 1 and Mach-Zehnder modulator 2 is modulated; Wherein carrying downlink data, frequency is f
RERadiofrequency signal as the driving of Mach-Zehnder modulator 1, realize the single-side band modulation to light wave L1, it is f that output comprises frequency
0Center light carrier wave OLO1 and carry downlink data, frequency and be (f
0+ f
RF) single order optical sideband BBD; Frequency is f
RFLocal oscillation signal drive Mach-Zehnder modulator 2 and realize the centered carrier of L2 is suppressed modulation, the generation frequency is (f
0± f
RF) two single order sidebands, its medium frequency is (f
0+ f
RF) sideband be OLO2, polarization beam combiner realizes that the polarized orthogonal of two Mach-Zehnder modulators output closes the road, the band pass filter rejection frequency is (f
0-f
RF) single order sideband and other high-order sidebands, to comprise frequency be f in output
0OLO1, frequency be (f
0+ f
RF) BBD and three road light waves of two frequency contents of OLO2, consisted of the fusion light signal of down link, wherein frequency interval is f
RFOLO1 and BBD polarization parallel, OLO2 and polarized orthogonal identical with the BBD frequency;
The fusion optical signals erbium-doped fiber amplifier of down link is amplified to suitable power, transfers to the base station through monomode fiber;
In the down link access in radio receiver module, wavelength interleaves filter and realizes that down-link frequencies is f
0+ f
RFOLO2 and BBD and frequency be f
0OLO1 separate, frequency OLO2 identical and polarized orthogonal separates through polarization beam apparatus with BBD, coherent demodulation obtains descending access in radio signal, its medium frequency is f
0OLO1 reserve light carrier as up link;
In the access in radio up link, light intensity modulator in the base station with binary upstream data. signals intensity modulated to the up light carrier OLO1 that reserves, and by the uplink optical fibers link transmission to central station, the photodetector in the central station is converted into binary base electrical signal by direct detection;
In the downlink wireless access receiver module, polarization beam apparatus merges down link with light signal, and to be separated into the frequency that comprises OLO1 and BBD be f
RFLight carry millimeter-wave signal and frequency is f
0+ f
RFUpper wired link light carrier OLO2, wherein light carries millimeter-wave signal to be converted to frequency by photodetector is f
RFElectric millimeter-wave signal, through bandpass filtering and after amplifying by antenna transmission to the wireless interface receiving end, realize the wireless access of downstream signal;
In the wireless access up link, the antenna reception in the base station to frequency be f
U, the up electric millimeter-wave signal single-side band modulation that carrying the binary intensity modulating data is to the up link light carrier OLO2 that reserves, to central station, the high-speed photodetector in the central station is converted to the upward signal that the signal of telecommunication and demodulation obtain binary base band with uplink optical signal through the uplink optical fibers link transmission;
Above-mentioned up link and down link have realized merging the full duplex transmission of light signal, have consisted of full-duplex link.
2. described method according to claim 1 is characterized in that, in the downlink transmission module of described central station:
Downlink data signal is the higher M system Vector Modulation signal of spectrum efficiency; The lithium niobate Mach-Zehnder modulator that adopts 1 realize the single-side band modulation of one road continuous laser, Mach-Zehnder modulator 2 realizes that the centered carrier of another road cross-polarization laser suppresses modulation, the local oscillation signal frequency is identical with the down link millimeter-wave frequency; The filter rejection frequency is (f
0-f
RF) single order sideband and other high-order sideband compositions, down link merges light signal and comprises that frequency is (f
0+ f
RF) light carrier OLO2 and carry the BBD of downlink data information, and frequency is f
0Carrier wave OLO1, BBD but polarized orthogonal identical with the OLO2 frequency wherein, BBD and OLO1 polarization parallel and frequency interval are f
RF, it is simple that the optical signal frequency composition is merged in base station output, and it is little affected by optical fiber dispersion.
3. method according to claim 1 is characterized in that, in described down link access in radio receiver module:
It is f with frequency that the wavelength of base station interleaves optical filter
0+ f
RFBBD and OLO2 and, frequency is f
0Up-link carrier OLO1 separate, BBD enters coherent optical heterodyne communicatio with OLO2 after cross-polarization separates, coherent optical heterodyne communicatio is made of Polarization Controller, four input port light hybrid blenders and two pairs of balance photodetectors, realize the coherent demodulation of descending wire signal, to obtain the access in radio signal of base band.
4. method according to claim 1 is characterized in that, in described access in radio up link:
Light intensity modulator in the base station is f with binary system upstream data. signals intensity modulated in frequency
0Up light carrier OLO1 on, to central station, be converted to base electrical signal by photodetector through ul transmissions.
5. method according to claim 1 is characterized in that, in described downlink wireless access receiver module:
Polarization beam apparatus is f with the downlink data frequency of carrying of polarized orthogonal
RFLight carry millimeter-wave signal and frequency is f
0+ f
RFUp-link carrier OLO2 separate, wherein to carry millimeter-wave signal be f by frequency to light
0+ f
RFThe BBD that carries downlink data and frequency be f
0OLO1 consist of, the two polarization parallel, light carries millimeter-wave signal and is not less than f through response frequency
RFPhotodetector be converted to electric millimeter-wave signal, after amplifying, be emitted to user's incoming end by antenna wireless.
6. method according to claim 1 is characterized in that, described in the wireless access up link:
The frequency that is received by antenna for base station is f
U, the up electric millimeter wave single-side band modulation that carrying the binary intensity modulation signal is f to the frequency of reserving
0+ f
RFUp-link carrier OLO2, the generation frequency is f
0+ f
RF-f
UThe sideband of carrying upward signal, light carrier and signal frequency side band to central station, obtain binary baseband signal through opto-electronic conversion and coherent demodulation by the uplink optical fibers link transmission.
7. asymmetric full duplex wire/wireless mixed access system based on PON and ROF is characterized in that it comprises:
System is made of the asymmetric full duplex transmission link between central station, base station and central station and base station, wherein central station comprises downlink transmission module, wire/wireless up link receiver module, the wireless access base station comprises downlink wireless receiver module and radio up-line transmitter module and duplexed antenna, the access in radio base station comprises the wired receiver module of down link and wired uplink transmit module, and the full duplex transmission link between central station and base station comprises up link and down link:
Described downlink transmission module, in order to produce PON wired/RoF wireless fusion light signal, its main devices comprises continuous wave laser, polarization beam apparatus, lithium niobate Mach-Zehnder modulator, polarization beam combiner and band pass filter; It is f that described laser sends centre frequency
0Continuous laser; Described polarization beam apparatus is the two-way of polarized orthogonal with the incident laser beam splitting, and is injected into respectively two lithium niobate Mach-Zehnder modulators; Described lithium niobate Mach-Zehnder modulator 1 is through loading the frequency f of downlink data signal
RFRadio frequency signals drive, the single-side band modulation continuous laser produces the single order sideband BBD comprise centered carrier OLO1 and to carry downlink data, its frequency is respectively f
0(f
0+ f
RF); Described lithium niobate Mach-Zehnder modulator 2 is in frequency f
RFRadio-frequency (RF) local oscillator drive the lower optical carrier suppression modulation that realizes, the generation frequency is (f
0± f
RF) two single order sidebands, its medium frequency is (f
0+ f
RF) light wave be OLO2; Described polarization beam combiner is with the road of just joining of two-way lithium niobate Mach-Zehnder modulator output; Described band pass filter rejection frequency is (f
0-f
RF) sideband and other high-order sidebands, the down link of output merges light signal and comprises BBD, OLO1 and OLO2;
Described down link access in radio receiver module is in harmonious proportion the extraction of up light carrier in order to the coherent reception solution that realizes descending fusion light signal, and its main devices comprises that wavelength interleaves optical filter, polarization beam apparatus and coherent optical heterodyne communicatio; Described wavelength interleaves optical filter and finishes frequency for (f in the access in radio base station
0+ f
RF) OLO1 and BBD and frequency be f
0The separation of up-link carrier OLO2; Described polarization beam apparatus separates same frequency OLO1, the BBD of polarized orthogonal; Described coherent optical heterodyne communicatio comprises Polarization Controller, four port optical hybrid and two pairs of balance photodetectors, in order to realize the coherent demodulation of downlink data;
Described downlink wireless access receiver module, carry millimeter wave and opto-electronic conversion is electric millimeter wave in order to the light of isolating descending fusion light signal, extract simultaneously up light carrier, its main devices comprises polarization beam apparatus, photodetector, band pass filter and transmitting antenna; Described polarization beam apparatus separates the optical millimeter wave signal of polarized orthogonal in the wireless access base station with up-link carrier; Described photodetector is converted to electric millimeter wave with optical millimeter wave; Described band pass filter is that the electric millimeter wave of fRF leaches with frequency; Described antenna realizes that electric millimeter wave is emitted to user's receiving terminal;
Described up link access in radio transmitter module, in order to the light modulation of the uplink signal of realizing access in radio, its main devices is light intensity modulator; Described light intensity modulator is modulated to the up light carrier of reservation with binary base band upward signal, as the base station output of access in radio up link;
Described up link access in radio receiver module is converted to the signal of telecommunication in order to the light signal of realizing wired up link, and its main devices is photodetector; Described photodetector is the signal of telecommunication with the uplink optical signal opto-electronic conversion, and demodulation obtains wired upstream data;
Described uplink radio access transmitter module, in order to realize up millimeter-wave signal to the modulation of up light carrier, its main devices is light intensity modulator; Described in the wireless access base station, the up millimeter-wave signal single-side band modulation that light intensity modulator receives antenna for base station is in up light carrier, as the base station output of wireless access up link;
Described uplink radio access receiver module is the signal of telecommunication in order to the light signal that receives radio up-line and with its opto-electronic conversion, and its main devices is high-speed photodetector; The light signal of described up link is converted to the signal of telecommunication through photodetector, further is demodulated into binary baseband signal in electric territory;
Transmission link between described central station and base station, in order to finishing the full duplex transmission of uplink and downlink signal, it mainly is made of optical fiber and the erbium-doped fiber amplifier that is used for the compensated optical signal attenuation loss.
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