CN103516429B - Based on W waveband broadband millimeter wave full duplex cut-in method and the system of local oscillator broadcast - Google Patents
Based on W waveband broadband millimeter wave full duplex cut-in method and the system of local oscillator broadcast Download PDFInfo
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- CN103516429B CN103516429B CN201310418077.6A CN201310418077A CN103516429B CN 103516429 B CN103516429 B CN 103516429B CN 201310418077 A CN201310418077 A CN 201310418077A CN 103516429 B CN103516429 B CN 103516429B
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Abstract
The present invention discloses a kind of W waveband broadband millimeter wave full duplex cut-in method based on local oscillator broadcast and system, relates to optical communication and millimetre-wave attenuator field.At central station, N number of downlink data generation module produces N number of SSB signal, shares local oscillator generation module and produces W-waveband trimmed book and shake, and N number of SSB signal and trimmed book shake after wavelength division multiplexing and transfer to distant-end node.After distant-end node demultiplexing, every road signal is reassembled as trimmed book and shakes and a SSB signal, realizes local oscillator broadcast.Each road signal SOA carries out nonlinear interaction and produces multiple ideler frequency light, be transfer to base station after a certain within the scope of 75-110GHz carries the ideler frequency optical coupling of signal by the carrier wave in SSB signal with its frequency interval, carry out beat frequency, produce W-waveband rf signal.In base station, extract the carrier wave of the partial carrier wave in down link as upward signal by Fiber Bragg Grating FBG.Upward signal after modulation carries out wavelength division multiplexing at distant-end node, reaches central station, completes full duplex RoF link.
Description
Technical field
The present invention relates to optical communication and millimetre-wave attenuator field, particularly relate to utilize and realize the area of light process of W-waveband millimeter-wave signal based on the RoF technology of WDM-PON and local oscillator broadcast technology and carried out the full duplex network architectural framework of long range propagation by optical fiber.
Background technology
In recent years, along with developing rapidly of the communication technology, the scope of business of communication is constantly expanded, and people require to improve constantly to the transmission capacity of communication network, and this makes transmission network to the wave division multiplex transmission future development of the All-optical switching based on optical fiber.
Wave division multiplexing passive optical network (WDM-PON) wavelength identifying user end ONU, there is protocol transparent, be with roomy, safety, the advantage such as convenient deployment, be realize the 40Gb/s even effective scheme of higher rate PON intelligent acess, but the flexible convenience of access in radio is limited.Wireless communication section or whole channels adopt radio wave as transmission medium, and can realize the access that user terminal is flexible, this advantage makes radio communication gain great popularity.But the Theoretical Rate of WiMAX and LTE of wireless access can be provided at present in 10Mb/s magnitude, the Theoretical Rate of WiFi is in 100Mb/s magnitude, point-to-point microwave link speed is also in 100Mb/s magnitude, cannot meet Future broadband communication needs, and these narrowband wireless communications used low-frequency wireless electricity frequency spectrum very crowded.By contrast, W-waveband (75-110GHz) millimeter wave can provide the frequency spectrum resource of 35GHz, and be in the window of atmospheric attenuation, realize 40Gb/s even the super wideband wireless access of 100Gb/s relatively easy, and be expected to the rate mismatch solving optical fiber and wireless access.
RoF technology can solve the loss of high-frequency wideband wireless access and the problem such as device bandwidth is limited, and what be expected to significantly to reduce millimeter wave broadband wireless access realizes difficulty and cost, makes optical fiber and Radio Access Network realize seamless fusion.Although, RoF technology is also applicable to W-waveband (75-110GHz) in principle, but along with the increase of signal bandwidth and millimeter-wave frequency are increased to W-waveband, high frequency millimeter ripple RoF technology also shows some new problems, can not directly by RoF Technique Popularizing to W-waveband.First the impact being optical fiber dispersion is more serious, and the amplitude fading caused by optical fiber dispersion and pulse are walked from more serious.Next is the problem that millimeter wave produces, although can overcome the impact of dispersion by SSB modulation, do not have speed more than the directly modulated lasers of 70GHz, the 70GHz bandwidth optical modulator required for external modulation and Millimeter-Wave Source also do not have commercialization.The method that the millimeter wave of current report produces mainly contains two kinds: (1) produces by the frequency-doubled effect that non-linear radio frequency is modulated two light waves that frequency interval equals required millimeter-wave frequency, namely double frequency light carries millimeter wave carrier, then the two is separated, by on Data Modulation wherein a carrier wave light wave, the method frequently drift is less, but has obvious phase noise; The separate lasers that (2) two output frequency intervals equal required millimeter-wave frequency produces this two light waves, to close Data import before road on one of them light wave at light wave, although the method is simple, the two frequency and phase place have nothing to do, drift frequently and phase noise serious.And baud rate carries millimeter-wave signal more than the light of 10Gb/s, the impact of band internal dispersion also needs to consider.Secondly, along with SSB light carries the increase of millimeter-wave frequency, the idle frequency spectrum between two optical frequency compositions also increases thereupon, and the utilization ratio of optical fiber frequency spectrum resource reduces.Again, it is all utilize photodetector at a high speed that W-waveband light carries the device that millimeter signal is converted to the signal of telecommunication, and as PIN-PD, UTC-PD, NBUTC-PD, its bandwidth at least needs to be greater than millimeter-wave frequency, and photoelectric conversion efficiency is high as much as possible.Technical University Of Denmark I.T.Monroy group, DTU, the A.Hirata of Japan, Taiwan J.W.Shi group have all done correlative study to the generation of W-waveband millimeter wave, but its speed used is greater than the transmitter of the high-frequency wideband wireless link of 10Gb/s not based on simple electronic device.
Summary of the invention
For overcoming the above problems, the invention provides a kind of W waveband broadband millimeter wave full duplex cut-in method based on local oscillator broadcast and system.
The invention provides a kind of W waveband broadband millimeter wave full duplex cut-in method based on local oscillator broadcast, for improving the spectrum utilization efficiency of optical fiber link, reduce the data-signal damage that optical fiber dispersion causes, simplified network structure, realize W-waveband millimeter wave ultra-wideband wireless access, it comprises: in the downlink transmission module of central station, comprises N number of downstream signal generation module and a shared trimmed book and to shake generation module; At downstream signal generation module, for the i-th tunnel, be f by frequency
ilaser send light wave, be incident to lithium niobate Mach-Zehnder modulator, by carrying downlink data signal a
ifrequency be f
rFilocal oscillation signal drive, generation frequency is f
icentered carrier C
iand bearing downlink data-signal a
ifrequency be f
i+ f
rFisingle order sideband A
i; To shake generation module at shared trimmed book, frequency is f
l1laser send light wave, being incident to the lithium niobate Mach-Zehnder modulator of two cascades, is f by frequency
l2radio frequency signals drive its produce frequency interval be 8f
l2two relevant sidebands, the trimmed book that the system that is shares shakes OLO, utilizes Erbium-Doped Fiber Amplifier to carry out power amplification to it; The descending SSB signal B in N road
1, B
2..., B
i..., B
nand trimmed book shake OLO by wavelength division multiplexer close road be downlink optical signal, be transmitted through the fiber to far-end switching node; In the down link processing module of far-end switching node, the downlink optical signal of wavelength division multiplexing is demultiplexing as N road signal by Wave decomposing multiplexer, the trimmed book OLO that shakes to be divided into the N road of constant power after amplifying by 1 × N optical coupler, be reassembled as each road all to comprise SSB signal and trimmed book and to shake the downstream signal of OLO, utilize the four-wave mixing effect of semiconductor optical amplifier that SSB signal and trimmed book are shaken each frequency content generation nonlinear interaction of OLO, for the i-th road signal, produce and SSB optical signal carrier C
ifrequency interval is 8f
l2+ 3f
rFiideler frequency light X
i, C
iwith X
ibeing combined into frequency interval is 8f
l2+ 3f
rFiw-waveband millimeter wave light signal, be transmitted through the fiber to base station; In the down link processing module of base station, carry out opto-electronic conversion in each base station and produce rf signal, for the i-th road signal, photodetector will by C
iand X
iit is 8f that the millimeter wave light signal of composition is converted to frequency
l2+ 3f
rFiw-waveband millimeter wave signal of telecommunication R
i, held to wireless user by antenna transmission, complete the transmission of downstream signal; In the down-link reception module of user side, the millimeter-wave signal received by antenna by envelope detection is demodulated into baseband signal; In the uplink transmit module of user side, i-th user's tranmitting frequency is f
eiw-waveband millimeter wave wireless signal E
ito base station; In the uplink processing module of base station, the up millimeter-wave signal received by antenna by envelope detection is demodulated into baseband signal, and by light modulator modulates on light wave, for the i-th road upward signal, by the radiofrequency signal E received
ibe baseband signal e by envelope detection down conversion
i, utilize Fiber Bragg Grating FBG, by the part light carrier C in down link
iloopback utilizes, and as the carrier wave of upward signal, utilizes lithium niobate Mach-Zehnder modulator by e
ibe loaded into C
ion, form signal F
i, through Optical Fiber Transmission to distant-end node; In distant-end node uplink processing module, from the N road uplink optical signal F of N number of base station
1, F
2..., F
i..., F
nbe multiplexed with uplink optical signal via wavelength division multiplexer, pass central station back by optical fiber; In the extended receiver module of central station, a Wave decomposing multiplexer is by up N road light signal demultiplexing; Each road light signal is N road uplink baseband signal e by photodetector down conversion
1, e
2..., e
i..., e
n; Above-mentioned up link and down link can realize the full duplex transmission of signal, constitute full-duplex link.
As a kind of method for optimizing, the downlink transmission module at central station: at downstream signal generation module, for the i-th tunnel, is f by frequency
ilaser send light wave, be incident to the lithium niobate Mach-Zehnder modulator that modulation voltage is 2.3V, half-wave voltage is 4V, by carrying downlink data signal a
ifrequency be f
rFilocal oscillation signal drive, make it produce SSB signal B
i, it comprises frequency is f
icentered carrier C
iand bearing downlink data-signal a
ifrequency be f
i+ f
rFisingle order sideband A
i; Be carried in the downstream signal a on single order sideband
iit can be the binary intensity modulation signal of different rates; To shake generation module at shared trimmed book, frequency is f
l1laser send light wave, being incident to the cascade lithium niobate Mach-Zehnder modulator that two are offset to maximum bias point, is f by frequency
l2radio frequency signals drive its produce frequency interval be 8f
l2two relevant sidebands, the trimmed book that the system that is shares shakes OLO; The trimmed book vibration frequency interval 8f produced
l2within the scope of W-waveband, when utilizing local oscillator and SSB signal to produce W-waveband millimeter-wave signal, because trimmed book shakes broader bandwidth, so reduce the requirement to SSB signal bandwidth, improve the spectrum utilization efficiency of optical fiber link simultaneously.
As a kind of method for optimizing, down link processing module at far-end switching node: the four-wave mixing effect utilizing semiconductor optical amplifier, shake OLO as pump light using trimmed book, and SSB signal, as flashlight, makes each frequency content generation nonlinear interaction of flashlight and OLO; For the i-th tunnel, OLO and B
ibe incident to semiconductor optical amplifier, after four wave mixing nonlinear interaction, exporting many group carrier frequency separation is 8f
l2sSB ideler frequency light signal and frequency interval be f
rFiideler frequency light signal, each ideler frequency light all carries signal a
i; We choose and flashlight B
iin carrier wave C
ifrequency interval is 8f
l2+ 3f
rFiideler frequency light X
i, X
iwith C
ibe combined into radio frequency light signal, its frequency is within the scope of W-waveband; Due to C
ido not carry signal, only have X
ibe loaded with signal, so this downstream signal is less by the impact of optical fiber dispersion; In addition, in each road downstream signal, trimmed book used shakes OLO by broadcast acquisition.
As a kind of method for optimizing, the down link processing module in base station: for the i-th road signal, by C
iand X
ithe radio frequency light signal of composition is incident to Fiber Bragg Grating FBG, by suitably regulating its reflection coefficient, makes C
ihalf luminous power exported by the reflex port of Fiber Bragg Grating FBG, it is using the carrier wave as upward signal; C
isecond half luminous power and X
iexported by the transmission mouth of Fiber Bragg Grating FBG, utilize photodetector to be converted to the signal of telecommunication, the frequency produced by beat frequency by band pass filter is 8f
l2+ 3f
rFiw-waveband radiofrequency signal R
ileach, held to wireless user by antenna transmission, complete the transmission of downstream signal; Because each base station only needs the light signal transmitted to carry out opto-electronic conversion, bandpass filtering and by antenna transmission for down link, simplify the structure of base station.
As a kind of method for optimizing, the uplink processing module in base station: for the i-th road signal, the radiofrequency signal E that base station will be received by envelope detection
ibe converted to base electrical signal e
i; Utilize Fiber Bragg Grating FBG, suitably regulate its reflection coefficient, extract carrier wave C in down link
ihalf luminous power, as the carrier wave of upward signal; Utilize lithium niobate Mach-Zehnder modulator by e
ibe loaded into the C of extraction
ion, form signal F
i; Because up link light carrier can directly extract from down link, base station, without the need to additional light source, achieves base station gauge without light source, simplifies architecture of base station and function, reduces power consumption, provides cost savings.
The invention provides a kind of W waveband broadband millimeter wave full duplex connecting system based on local oscillator broadcast, it comprises:
A central station, a far-end switching node, N number of base station, N number of user side, shakes for broadcasting W-waveband trimmed book and transmits the full duplex fibre-optical channel of uplink and downlink base band or intermediate frequency light signal;
Downlink transmission module at central station: comprise N number of downstream signal generation module and a shared trimmed book and to shake generation module; Main devices comprises laser, lithium niobate Mach-Zehnder modulator, radio-frequency (RF) local oscillator, wavelength division multiplexer, Erbium-Doped Fiber Amplifier; At downstream signal generation module, for the i-th tunnel, it is f that laser produces centre frequency
icontinuous laser, be incident to lithium niobate Mach-Zehnder modulator, carry downlink data signal a
ifrequency be f
rFilocal oscillation signal drive, generation frequency is f
icentered carrier C
iand bearing downlink data-signal a
ifrequency be f
i+ f
rFisingle order sideband A
i; To shake generation module at shared trimmed book, frequency is f
l1laser send light wave, being incident to the lithium niobate Mach-Zehnder modulator of two cascades, is f by frequency
l2radio frequency signals drive its produce frequency interval be 8f
l2two relevant sidebands, the trimmed book that the system that is shares shakes OLO; Erbium-Doped Fiber Amplifier is shaken to trimmed book and is carried out power amplification; The descending SSB signal B in N road
1, B
2..., B
i..., B
nand the trimmed book OLO that shakes is combined into a road signal by wavelength division multiplexer and is transmitted through the fiber to far-end switching node;
Down link processing module at far-end switching node: main devices comprises Wave decomposing multiplexer, 1 × N optical coupler, semiconductor optical amplifier, band pass filter, 2 × 1 optical couplers; The light signal received is decomposed into N road downstream signal by Wave decomposing multiplexer, the trimmed book OLO that shakes is divided into the N road of constant power by 1 × N optical coupler, be reassembled as each road all to comprise SSB signal and trimmed book and to shake the downstream signal of OLO, the four-wave mixing effect of semiconductor optical amplifier is utilized to make the light signal of input each frequency content generation nonlinear interaction, for the i-th road signal, B
ibe incident to semiconductor optical amplifier with OLO, produce and SSB optical signal carrier C
ifrequency interval is 8f
l2+ 3f
rFiideler frequency light X
i, other composition of filtering, C
iwith X
ibeing combined into frequency interval is 8f
l2+ 3f
rFiw-waveband millimeter wave light signal, be transmitted through the fiber to base station;
Down link processing module in base station: main devices comprises photodetector, band pass filter, antenna; Carry out opto-electronic conversion in each base station and produce rf signal, for the i-th road signal, photodetector will by C
iand X
iit is 8f that the millimeter wave light signal of composition is converted to frequency
l2+ 3f
rFiw-waveband millimeter wave signal of telecommunication R
iand baseband signal, utilize band pass filter to leach R
i, held to wireless user by antenna transmission, complete the transmission of downstream signal;
Down-link reception module at user side: main devices comprises reception antenna, envelope detector, low pass filter; The millimeter-wave signal that antenna is received by envelope detector and low pass filter by each user side is demodulated into baseband signal;
Uplink transmit module at user side: each user launches W-waveband radiofrequency signal E by wireless device
1, E
2..., E
i..., E
nto each respective base station;
Uplink processing module in base station: main devices comprises envelope detector, low pass filter, Fiber Bragg Grating FBG, lithium niobate Mach-Zehnder modulator; For the i-th road upward signal, up millimeter-wave signal E antenna received by envelope detection and low-pass filtering
ibe demodulated into baseband signal e
i, Fiber Bragg Grating FBG for extracting the partial carrier wave in down link, as the carrier wave of upward signal; Utilize Fiber Bragg Grating FBG, by the part light carrier C in down link
iloopback utilizes, and as the light carrier of upward signal, utilizes lithium niobate Mach-Zehnder modulator by e
ibe loaded into C
ion, form signal F
i, be transmitted through the fiber to distant-end node;
Uplink processing module at far-end switching node: main devices is wavelength division multiplexer; From the uplink optical signal F of N number of base station
1, F
2..., F
i..., F
nbe combined into a road light signal via wavelength division multiplexer, pass central station back by optical fiber;
Extended receiver module at central station: main devices comprises Wave decomposing multiplexer, photodetector; Wave decomposing multiplexer is by up N road light signal demultiplexing; Each road light signal is converted to signal of telecommunication e by photodetector
1, e
2..., e
i..., e
n;
Shake for broadcasting W-waveband trimmed book and transmit the full duplex fibre-optical channel of uplink and downlink base band or intermediate frequency light signal: mainly comprising standard single-mode fiber, realize effective transmission of up-downgoing light signal.
After adopting technical scheme provided by the invention: owing to being carried in the downstream signal a on single order sideband
ican be the binary intensity modulation signal of different rates, make system have flexibility; Due to the introducing that W-waveband broadcast millimeter wave trimmed book shakes, reduce the requirement to SSB signal bandwidth, improve the spectrum utilization efficiency of optical fiber link simultaneously; Because down link signal is single-side band modulation, effectively can reduce the impact of optical fiber dispersion, extend the transmission range that light carries millimeter-wave signal; Each road signal produces multiple ideler frequency light by four wave mixing, selects different ideler frequency light and carrier wave to form the W-waveband radio frequency light signal of different frequency, improves the flexibility of system; Because up link light carrier can directly extract from down link, base station, without the need to additional light source, achieves base station gauge without light source, simplifies architecture of base station and function, reduces power consumption, provides cost savings.
Accompanying drawing explanation
The schematic diagram of the broadband millimeter-wave signal full duplex connecting system based on the broadcast of WDM-PON/ local oscillator that Fig. 1 announces for the present invention.
Fig. 2 is the i-th descending SSB signal B in tunnel sent by central station
iand trimmed book shakes the spectrogram of OLO.
Tu3Wei i-th road downstream signal is 8f at the carrier frequency separation that distant-end node is produced by four-wave mixing effect
l2many groups SSB ideler frequency light signal and frequency interval be f
rFiideler frequency optical signal spectrum figure.
Carrier wave C in the downlink optical signal of Tu4Wei i-th road
iand with interval be the ideler frequency light X of 110GHz
ispectrogram.
Fig. 5 is at base station i-th road downlink radio-frequency signal R
ielectrical domain spectrogram.
Tu6Wei i-th road downstream signal in BTB situation, at the baseband signal eye pattern of user's receiving terminal demodulation 10Gb/s out.
Tu7Wei i-th road downstream signal after 20km Optical Fiber Transmission, at the baseband signal eye pattern of user's receiving terminal demodulation 10Gb/s out.
Fig. 8 is the i-th road upstream radio-frequency signal E received in base station
ielectrical domain spectrogram.
Tu9Wei i-th road upward signal E
ibe carried in carrier wave C
iafter upper, the signal F of formation
ispectrogram.
Figure 10 be the i-th road upward signal in BTB situation, at the baseband signal eye pattern of the 3Gb/s of central station after envelope detection demodulation.
Figure 11 be the i-th road upward signal after 20km Optical Fiber Transmission, at the baseband signal eye pattern of the 3Gb/s of central station after envelope detection demodulation.
Embodiment
The invention provides a kind of broadband millimeter-wave signal full duplex cut-in method based on the broadcast of WDM-PON/ local oscillator, for improving the spectrum utilization efficiency of optical fiber link, reduce the data-signal damage that optical fiber dispersion causes, simplified network structure, realize W-waveband millimeter wave ultra-wideband wireless access, for realizing above-mentioned effect, need to adopt following step:
Downlink transmission module at central station: comprise N number of downstream signal generation module and a shared trimmed book and to shake generation module; At downstream signal generation module, for the i-th tunnel, be f by frequency
ithe laser of=193.19THz sends light wave, is incident to the lithium niobate Mach-Zehnder modulator that modulation voltage is 2.3V, half-wave voltage is 4V, by carrying binary system downlink data signal a
ifrequency be f
rFithe local oscillation signal of=10GHz drives, and generation frequency is f
ithe centered carrier C of=193.19THz
iand bearing downlink data-signal a
ifrequency be f
i+ f
rFithe single order sideband A of=193.2THz
i; Form SSB signal B
i, transfer to multiplexer.To shake generation module at shared trimmed book, frequency is f
l1the laser of=193.1THz sends light wave, and being incident to the cascade lithium niobate Mach-Zehnder modulator that two are offset to maximum bias point, is f by frequency
l2its generation frequency interval of the radio frequency signals drive of=10GHz is 8f
l2two relevant sidebands of=80GHz, the trimmed book that the system that is shares shakes OLO.The descending SSB signal B in N road
1, B
2..., B
i..., B
nand the trimmed book OLO that shakes is transmitted through the fiber to far-end switching node through wavelength division multiplexing.
Down link processing module at far-end switching node: the downlink optical signal of wavelength division multiplexing is demultiplexing as N road signal by Wave decomposing multiplexer, the trimmed book OLO that shakes is divided into the N road of constant power by 1 × N optical coupler, be reassembled as each road all to comprise corresponding SSB signal and trimmed book and to shake the downlink optical signal of OLO, achieve millimeter wave trimmed book and shake in the broadcast of whole network.Utilize the four-wave mixing effect of semiconductor optical amplifier, make each road flashlight and OLO that nonlinear interaction occur, produce multiple ideler frequency light component, selecting with the carrier frequency separation in flashlight is the ideler frequency light that within the scope of 75-110GHz one carries signal, after being combined into a road light signal with carrier wave, transfer to base station.For the i-th road downstream signal, it comprises SSB signal B
iand trimmed book shakes OLO, its frequency spectrum as shown in Figure 2.Trimmed book shakes OLO as pump light, B
ias flashlight, transfer to the semiconductor optical amplifier that Injection Current is 200mA, utilizing its four-wave mixing effect to produce many group carrier frequency separation is as shown in Figure 3 8f
l2the SSB ideler frequency light signal of=80GHz and frequency interval are f
rFithe ideler frequency light signal of=10GHz, in ideler frequency light SSB signal, carrier wave does not carry signal, and we choose the ideler frequency light X carrying signal
i, itself and flashlight B
iin carrier wave C
ifrequency interval is 8f
l2+ 3f
rFi=110GHz, X
iwith C
ibe combined into radio frequency light signal, be transmitted through the fiber to base station.Its frequency spectrum as shown in Figure 4.
Down link processing module in base station: carry out in each base station opto-electronic conversion produce rf signal, for the i-th road signal, photodetector by transmit by C
iand X
iit is 8f that the millimeter wave light signal of composition is converted to frequency
l2+ 3f
rFithe W-waveband millimeter wave signal of telecommunication R of=110GHz
i, held to wireless user by antenna transmission, its electrical domain frequency spectrum as shown in Figure 5.
Down-link reception module at user side: be baseband signal by the radiofrequency signal down conversion received by envelope detection.We are for the i-th road signal, the radiofrequency signal R received
ibaseband signal a is obtained after envelope detection
i.Can observation signal quality by eye pattern.Fig. 6 is signal a
ieye pattern after 0km, 5km, 10km, 20km Optical Fiber Transmission.
Uplink transmit module at user side: each user launches W-waveband radiofrequency signal E by wireless device
1, E
2..., E
i..., E
nto each respective base station.I-th road signal E
ifor the radiofrequency signal of 80GHz, its electrical domain frequency spectrum as shown in Figure 7.
Uplink processing module in base station: the radiofrequency signal down conversion received is baseband signal by N number of base station respectively.For the i-th road upward signal, by the radiofrequency signal E of 80GHz
ibe baseband signal e by envelope detection down conversion
i.Utilize Fiber Bragg Grating FBG, extract carrier wave C in down link
ihalf luminous power, as the carrier wave of upward signal, utilize Mach-Zehnder modulator by e
ibe loaded into the C of extraction
ion, form signal F
i, through Optical Fiber Transmission to distant-end node.Fig. 8 is signal F
ifrequency spectrum.
Uplink processing module at far-end switching node: from the N road uplink optical signal F of N number of base station
1, F
2..., F
i..., F
nbe multiplexed with uplink optical signal via wavelength division multiplexer, pass central station back by optical fiber.
Extended receiver module at central station a: Wave decomposing multiplexer is by up N road light signal demultiplexing, and each road light signal is N road uplink baseband signal of telecommunication e by photodetector down conversion
1, e
2..., e
i..., e
n.I-th road signal F
ibaseband signal e is obtained through opto-electronic conversion and low pass filter
i.Fig. 9 is e
ieye pattern after 0km, 5km, 10km, 20km Optical Fiber Transmission.
The broadband millimeter-wave signal distributions full-duplex method based on the broadcast of WDM-PON/ local oscillator that the present invention proposes and system have following beneficial effect:
(1) the downstream signal a on single order sideband is carried in
ican be the binary intensity modulation signal of different rates, make system have flexibility.
(2) due to the introducing that W-waveband broadcast millimeter wave trimmed book shakes, reduce the requirement to SSB signal bandwidth, improve the spectrum utilization efficiency of optical fiber link simultaneously.
(3) down link signal is SSB signal, effectively can reduce the impact of optical fiber dispersion, extends the transmission range that light carries millimeter-wave signal.
(4) each road signal produces multiple ideler frequency light by four wave mixing, selects different ideler frequency light and carrier wave to form the W-waveband radio frequency light signal of different frequency, improves the flexibility of system.
(5) because up link light carrier can directly extract from down link, base station, without the need to additional light source, achieves base station gauge without light source, simplifies architecture of base station and function, reduces power consumption, provides cost savings.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.
Claims (7)
1. the broadband millimeter-wave signal distributions full-duplex method based on the broadcast of WDM-PON local oscillator, for realizing W-waveband millimeter wave ultra-wideband wireless access, the broadcast trimmed book utilizing W-waveband to share shakes, improve the spectrum utilization efficiency of optical fiber link, reduce the data-signal damage that optical fiber dispersion causes, simplified network structure, is characterized in that, it comprises the steps:
Downlink transmission module at central station: comprise N number of downstream signal generation module and a shared trimmed book and to shake generation module; At downstream signal generation module, for the i-th tunnel, be f by frequency
ilaser send light wave, be incident to lithium niobate Mach-Zehnder modulator, by carrying downlink data signal a
ifrequency be f
rFilocal oscillation signal drive, generation frequency is f
icentered carrier C
iand bearing downlink data-signal a
ifrequency be f
i+ f
rFisingle order sideband A
i; To shake generation module at shared trimmed book, frequency is f
l1laser send light wave, being incident to the lithium niobate Mach-Zehnder modulator of two cascades, is f by frequency
l2radio frequency signals drive its produce frequency interval be 8f
l2two relevant sidebands, the trimmed book that the system that is shares shakes OLO, utilizes Erbium-Doped Fiber Amplifier to carry out power amplification to it; The descending SSB signal B in N road
1, B
2..., B
i..., B
nand trimmed book shake OLO by wavelength division multiplexer close road be downlink optical signal, be transmitted through the fiber to far-end switching node;
Down link processing module at far-end switching node: the downlink optical signal of wavelength division multiplexing is demultiplexing as N road signal by Wave decomposing multiplexer, the trimmed book OLO that shakes to be divided into the N road of constant power after amplifying by 1 × N optical coupler, be reassembled as each road all to comprise SSB signal and trimmed book and to shake the downstream signal of OLO, utilize the four-wave mixing effect of semiconductor optical amplifier that SSB signal and trimmed book are shaken each frequency content generation nonlinear interaction of OLO, for the i-th road signal, produce and SSB optical signal carrier C
ifrequency interval is 8f
l2+ 3f
rFiideler frequency light X
i, C
iwith X
ibeing combined into frequency interval is 8f
l2+ 3f
rFiw-waveband millimeter wave light signal, be transmitted through the fiber to base station;
Down link processing module in base station: carry out opto-electronic conversion and produce rf signal, for the i-th road signal, photodetector will by C
iand X
iit is 8f that the millimeter wave light signal of composition is converted to frequency
l2+ 3f
rFiw-waveband millimeter wave signal of telecommunication R
i, held to wireless user by antenna transmission, complete the transmission of downstream signal;
Down-link reception module at user side: the millimeter-wave signal received by antenna by envelope detection is demodulated into baseband signal;
Uplink transmit module at user side: i-th user's tranmitting frequency is f
eiw-waveband millimeter wave wireless signal E
ito base station;
Uplink processing module in base station: the up millimeter-wave signal received by antenna by envelope detection is demodulated into baseband signal, and by light modulator modulates on light wave, for the i-th road upward signal, by the radiofrequency signal E received
ibe baseband signal e by envelope detection down conversion
i, utilize Fiber Bragg Grating FBG, by the part light carrier C in down link
iloopback utilizes, and as the carrier wave of upward signal, utilizes lithium niobate Mach-Zehnder modulator by e
ibe loaded into C
ion, form signal F
i, through Optical Fiber Transmission to distant-end node;
In distant-end node uplink processing module: from the N road uplink optical signal F of N number of base station
1, F
2..., F
i..., F
nbe multiplexed with uplink optical signal via wavelength division multiplexer, pass central station back by optical fiber;
Extended receiver module at central station a: Wave decomposing multiplexer is by up N road light signal demultiplexing; Each road light signal is N road uplink baseband signal e by photodetector down conversion
1, e
2..., e
i..., e
n;
Above-mentioned up link and down link can realize the full duplex transmission of signal, constitute full-duplex link.
2. method according to claim 1, in the downlink transmission module of central station, is characterized in that:
At downstream signal generation module, for the i-th tunnel, be f by frequency
ilaser send light wave, be incident to lithium niobate Mach-Zehnder modulator, by carrying downlink data signal a
ifrequency be f
rFilocal oscillation signal drive, make it produce SSB signal B
i, it comprises frequency is f
icentered carrier C
iand bearing downlink data-signal a
ifrequency be f
i+ f
rFisingle order sideband A
i; Be carried in the downstream signal a on single order sideband
iit is the binary intensity modulation signal of different rates;
To shake generation module at shared trimmed book, frequency is f
l1laser send light wave, being incident to the cascade lithium niobate Mach-Zehnder modulator that two are offset to maximum bias point, is f by frequency
l2radio frequency signals drive its produce frequency interval be 8f
l2two relevant sidebands, the trimmed book that the system that is shares shakes OLO, utilizes Erbium-Doped Fiber Amplifier to carry out power amplification to it; The trimmed book vibration frequency interval 8f produced
l2within the scope of W-waveband, when utilizing local oscillator and SSB signal to produce W-waveband millimeter-wave signal, because trimmed book shakes broader bandwidth, so reduce the requirement to SSB signal bandwidth, improve the spectrum utilization efficiency of optical fiber link simultaneously.
3. method according to claim 1, in the down link processing module of far-end switching node, is characterized in that:
The downlink optical signal of wavelength division multiplexing is demultiplexing as N road signal by Wave decomposing multiplexer, the trimmed book OLO that shakes is divided into the N road of constant power by 1 × N optical coupler, be reassembled as each road all to comprise SSB signal and trimmed book and to shake the downstream signal of OLO, utilize the four-wave mixing effect of semiconductor optical amplifier, shake OLO as pump light using trimmed book, SSB signal, as flashlight, makes each frequency content generation nonlinear interaction of flashlight and OLO; For the i-th tunnel, OLO and B
ibe incident to semiconductor optical amplifier, after four wave mixing nonlinear interaction, exporting many group carrier frequency separation is 8f
l2sSB ideler frequency light signal and frequency interval be f
rFiideler frequency light signal, each ideler frequency light all carries signal a
i; We choose and flashlight B
iin carrier wave C
ifrequency interval is 8f
l2+ 3f
rFiideler frequency light X
i, X
iwith C
ibe combined into radio frequency light signal, its frequency is within the scope of W-waveband; Due to C
ido not carry signal, only have X
ibe loaded with signal, so this downstream signal is less by the impact of optical fiber dispersion; In addition, in each road downstream signal, trimmed book used shakes OLO by broadcast acquisition.
4. method according to claim 1, in the down link processing module of base station, is characterized in that:
For the i-th road signal, by C
iand X
ithe radio frequency light signal of composition is incident to Fiber Bragg Grating FBG, by suitably regulating its reflection coefficient, makes C
ihalf luminous power exported by the reflex port of Fiber Bragg Grating FBG, it is using the carrier wave as upward signal; C
isecond half luminous power and X
iexported by the transmission mouth of Fiber Bragg Grating FBG, utilize photodetector to be converted to the signal of telecommunication, the frequency produced by beat frequency by band pass filter is 8f
l2+ 3f
rFiw-waveband radiofrequency signal R
ileach, held to wireless user by antenna transmission, complete the transmission of downstream signal; Because each base station only needs the light signal transmitted to carry out opto-electronic conversion, bandpass filtering and by antenna transmission for down link, simplify the structure of base station.
5. method according to claim 1, in the uplink processing module of base station, is characterized in that:
For the i-th road signal, the radiofrequency signal E that base station will be received by envelope detection
ibe converted to base electrical signal e
i; Utilize Fiber Bragg Grating FBG, suitably regulate its reflection coefficient, extract carrier wave C in down link
ihalf luminous power, as the carrier wave of upward signal; Utilize lithium niobate Mach-Zehnder modulator by e
ibe loaded into the C of extraction
ion, form signal F
i; Because up link light carrier can directly extract from down link, base station, without the need to additional light source, achieves base station gauge without light source, simplifies architecture of base station and function, reduces power consumption, provides cost savings.
6. method according to claim 1, shaking for broadcasting W-waveband trimmed book and transmitting the full duplex wavelength channel of uplink and downlink base band and intermediate frequency light signal, it is characterized in that:
The light signal of up link and down link transmits by standard single-mode fiber, have two independently monomode fiber form, up, downstream signal transmits respectively in up, downlink optical fiber.
7. a broadband millimeter-wave signal distributions full duplex system based on the broadcast of WDM-PON local oscillator, it is characterized in that, it comprises:
A central station, a far-end switching node, N number of base station, N number of user side, shakes for broadcasting W-waveband trimmed book and transmits the full duplex fibre-optical channel of uplink and downlink base band or intermediate frequency light signal;
Downlink transmission module at central station: comprise N number of downstream signal generation module and a shared trimmed book and to shake generation module; Main devices comprises laser, lithium niobate Mach-Zehnder modulator, radio-frequency (RF) local oscillator, wavelength division multiplexer, Erbium-Doped Fiber Amplifier; At downstream signal generation module, for the i-th tunnel, it is f that laser produces centre frequency
icontinuous laser, be incident to lithium niobate Mach-Zehnder modulator, carry downlink data signal a
ifrequency be f
rFilocal oscillation signal drive, generation frequency is f
icentered carrier C
iand bearing downlink data-signal a
ifrequency be f
i+ f
rFisingle order sideband A
i; To shake generation module at shared trimmed book, frequency is f
l1laser send light wave, being incident to the lithium niobate Mach-Zehnder modulator of two cascades, is f by frequency
l2radio frequency signals drive its produce frequency interval be 8f
l2two relevant sidebands, the trimmed book that the system that is shares shakes OLO; Erbium-Doped Fiber Amplifier is shaken to trimmed book and is carried out power amplification; The descending SSB signal B in N road
1, B
2..., B
i..., B
nand the trimmed book OLO that shakes is combined into a road signal by wavelength division multiplexer and is transmitted through the fiber to far-end switching node;
Down link processing module at far-end switching node: main devices comprises Wave decomposing multiplexer, 1 × N optical coupler, semiconductor optical amplifier, band pass filter, 2 × 1 optical couplers; The light signal received is decomposed into N road downstream signal by Wave decomposing multiplexer, the trimmed book OLO that shakes is divided into the N road of constant power by 1 × N optical coupler, be reassembled as each road all to comprise SSB signal and trimmed book and to shake the downstream signal of OLO, the four-wave mixing effect of semiconductor optical amplifier is utilized to make the light signal of input each frequency content generation nonlinear interaction, for the i-th road signal, B
ibe incident to semiconductor optical amplifier with OLO, produce and SSB optical signal carrier C
ifrequency interval is 8f
l2+ 3f
rFiideler frequency light X
i, other composition of filtering, C
iwith X
ibeing combined into frequency interval is 8f
l2+ 3f
rFiw-waveband millimeter wave light signal, be transmitted through the fiber to base station;
Down link processing module in base station: main devices comprises photodetector, band pass filter, antenna; Carry out opto-electronic conversion in each base station and produce rf signal, for the i-th road signal, photodetector will by C
iand X
iit is 8f that the millimeter wave light signal of composition is converted to frequency
l2+ 3f
rFiw-waveband millimeter wave signal of telecommunication R
iand baseband signal, utilize band pass filter to leach R
i, held to wireless user by antenna transmission, complete the transmission of downstream signal;
Down-link reception module at user side: main devices comprises reception antenna, envelope detector, low pass filter; The millimeter-wave signal that antenna is received by envelope detector and low pass filter by each user side is demodulated into baseband signal;
Uplink transmit module at user side: each user launches W-waveband radiofrequency signal E by wireless device
1, E
2..., E
i..., E
nto each respective base station;
Uplink processing module in base station: main devices comprises envelope detector, low pass filter, Fiber Bragg Grating FBG, lithium niobate Mach-Zehnder modulator; For the i-th road upward signal, up millimeter-wave signal E antenna received by envelope detection and low-pass filtering
ibe demodulated into baseband signal e
i, Fiber Bragg Grating FBG for extracting the partial carrier wave in down link, as the carrier wave of upward signal; Utilize Fiber Bragg Grating FBG, by the part light carrier C in down link
iloopback utilizes, and as the light carrier of upward signal, utilizes lithium niobate Mach-Zehnder modulator by e
ibe loaded into C
ion, form signal F
i, be transmitted through the fiber to distant-end node;
Uplink processing module at far-end switching node: main devices is wavelength division multiplexer; From the uplink optical signal F of N number of base station
1, F
2..., F
i..., F
nbe combined into a road light signal via wavelength division multiplexer, pass central station back by optical fiber;
Extended receiver module at central station: main devices comprises Wave decomposing multiplexer, photodetector; Wave decomposing multiplexer is by up N road light signal demultiplexing; Each road light signal is converted to signal of telecommunication e by photodetector
1, e
2..., e
i..., e
n;
Shake for broadcasting W-waveband trimmed book and transmit the full duplex fibre-optical channel of uplink and downlink base band or intermediate frequency light signal: mainly comprising standard single-mode fiber, realize effective transmission of up-downgoing light signal.
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| CN103944591B (en) * | 2014-05-13 | 2016-03-30 | 北京邮电大学 | The pseudo-millimeter wave ultra-wideband signal envelope detection system auxiliary based on optics and method |
| CN105680949A (en) * | 2016-01-05 | 2016-06-15 | 上海交通大学 | In-band full-duplex radio over fiber communication system based on wavelength division multiplexing |
| CN106452596B (en) * | 2016-10-26 | 2018-10-02 | 国网河南省电力公司信息通信公司 | A kind of WDM-RoF systems |
| CN106899355B (en) * | 2017-03-27 | 2019-04-30 | 湖南工学院 | Full light technology microwave receiving system and method |
| CN109067467B (en) * | 2018-09-26 | 2021-06-01 | 南京信息工程大学 | N-level array forming photoproduction W wave band transmitting method based on internal and external joint coding |
| CN109525318A (en) * | 2018-10-15 | 2019-03-26 | 深圳市太赫兹科技创新研究院 | A kind of full duplex light carrier radio communication system |
| 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 |
| CN114039665B (en) * | 2021-11-12 | 2023-10-31 | 大连海事大学 | Multi-carrier frequency generation and reliable transmission method for RoF system |
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| CN102324979A (en) * | 2011-09-09 | 2012-01-18 | 东华大学 | Optical quadruple frequency millimeter wave optical carrier wireless communication system |
| CN102710361A (en) * | 2012-06-01 | 2012-10-03 | 华为技术有限公司 | Distributed base-station signal transmission system and communication system |
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