CN105471467A - Reconfigurable radio frequency front end device supporting channel sharing - Google Patents
Reconfigurable radio frequency front end device supporting channel sharing Download PDFInfo
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- CN105471467A CN105471467A CN201610009293.9A CN201610009293A CN105471467A CN 105471467 A CN105471467 A CN 105471467A CN 201610009293 A CN201610009293 A CN 201610009293A CN 105471467 A CN105471467 A CN 105471467A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/403—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency
- H04B1/405—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency with multiple discrete channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/403—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency
- H04B1/406—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency with more than one transmission mode, e.g. analog and digital modes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
- H04J14/0202—Arrangements therefor
- H04J14/021—Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM]
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Abstract
The invention discloses a reconfigurable radio frequency front end device supporting channel sharing. The device comprises a radio frequency receiving module, an optical modulation module, an optical carrier local oscillation module, an all-optical frequency conversion module, an all-optical switching module and an intermediate frequency output module, wherein the radio frequency receiving module is used for receiving radio frequency signals; the optical modulation module is used for executing optical modulation for the radio frequency signals to generate radio-over-fiber signals; the optical carrier local oscillation module is used for generating optical carrier local oscillation signals corresponding to the radio-over-fiber signals; the all-optical frequency conversion module is used for performing beat frequency for the radio-over-fiber signals and the optical carrier local oscillation signals to generate intermediate frequency optical carrier mixing signals; the all-optical switching module is used for performing signal switching for the optical carrier mixing signals to output optical carrier signals of special wavelength combination; and the intermediate frequency output module is used for performing photoelectric conversion for the optical carrier signals to generate intermediate frequency signals. As compared with the prior art, the device provided by the invention is small in volume and low in power consumption, and has relatively high signal bandwidth; and the device provided by the invention can simply change signal switching modes so as to meet switching demands of multiple functions and multiple frequency bands.
Description
Technical field
The present invention relates to the communications field, relate to a kind of restructural radio frequency front-end device supporting channels share specifically.
Background technology
In the prior art, traditional radio-frequency front-end uses electronic device radio frequency (RF) signal to process.Its cardinal principle is through secondary even multistage frequency conversion, then converts the intermediate frequency (IF) of lower frequency to., not only there is Image interference in this superhet complex structure, and needs high quality factor (Q value), bulky IF filter.Therefore make complex system, cause integrated difficulty.One of replacement scheme of technique scheme is direct down-conversion receiver.Although there is not Image interference, also bring the problem of direct current offset, non-linear, the aspect such as noise, narrow-band filtering and isolation.
In addition, traditional radio-frequency front-end can only complete the conversion that fixed RF changes to fixed intermediate frequency, and the mixing for different frequency bands just needs to increase the corresponding device such as analog filter, amplifier, local oscillator.And need the frequency range supported to get more and more along with radio-frequency front-end, the increase of complete equipment and amendment very difficult.Meanwhile, the product index disunity of different vendor, usually cannot be compatible, causes the escalation process of radio-frequency front-end complicated lengthy and jumbled.
To sum up, in prior art, radio-frequency front-end shows deficiency in Insertion Loss, DC power, isolation, power handling capability and bandwidth etc.Further, in prior art, the solidification of radio-frequency front-end system, is unsuitable for multiband, many standard operations mode.For the above-mentioned problems in the prior art, need a kind of new radio-frequency front-end.
Summary of the invention
For radio-frequency front-end Problems existing in prior art in prior art, the invention provides a kind of restructural radio frequency front-end device supporting channels share, described device comprises:
Receiver Module, it is for receiving and forwarding radiofrequency signal, and described radiofrequency signal comprises maximum N number of passage and each passage comprises maximum M frequency range, and wherein, M and N is non-zero natural number;
Optical modulator module, it is connected with described Receiver Module, carries radiofrequency signal for carrying out light modulation to described radiofrequency signal to generate and to export light;
Light carries local oscillator module, and it carries local oscillation signal for generating and exporting the light carrying radiofrequency signal corresponding with described light, and it is identical with the wavelength that described light carries radiofrequency signal that the described light of same channels corresponding frequency band carries local oscillation signal;
Full light frequency-variable module, it carries local oscillator module with described optical modulator module and described light and is connected, and carries local oscillation signal carry out beat frequency to realize full photomixing thus to generate and the light exporting intermediate frequency carries mixed frequency signal for carrying radiofrequency signal and described light to described light;
All-optical switching module, it is connected with described full light frequency-variable module, carries out handshaking to export the light information carrying number of specific wavelength combination for carrying mixed frequency signal to described light;
Intermediate frequency output module, it is connected with described All-optical switching module, for carrying out opto-electronic conversion to generate and to export intermediate-freuqncy signal to described smooth information carrying number.
In one embodiment, described intermediate frequency output module comprises multiple medium frequency output end mouth, and all described medium frequency output end mouths are configured to the described intermediate-freuqncy signal exporting unified frequency.
In one embodiment:
Described optical modulator module comprises N number of light and carries radio frequency output port, wherein, each described light carries radio frequency output port and exports a road light and carry radio-frequency multiplexed signal, and it is that the described light of multiple different frequency ranges of corresponding same passage carries the multiplexing of radiofrequency signal that light described in a road carries radio-frequency multiplexed signal;
Described light carries local oscillator module and comprises N number of light and carry local oscillator output port, wherein, each described light carries local oscillator output port and exports a road light and carry local oscillator multiplexed signals, and it is that the described light of multiple different frequency ranges of corresponding same passage carries the multiplexing of local oscillation signal that light described in a road carries local oscillator multiplexed signals.
In one embodiment, described device also comprises lasing light emitter, described lasing light emitter for generating the multi-path light carrier wave of corresponding described radiofrequency signal, wherein, the port number that light carrier described in multichannel comprises and the frequency range band number that each passage comprises identical with described radiofrequency signal.
In one embodiment, described light carries local oscillator module and comprises M local oscillator wavelength division multiplexer, a M local oscillator electrooptic modulator and local oscillator allocation units, wherein:
Described local oscillator wavelength division multiplexer is connected with described lasing light emitter, each described local oscillator wavelength division multiplexer carries multiplexed signals for generating road first light, and the first light described in every road carries multiplexed signals and obtains by the described light carrier on all different passage of frequency range same in light carrier described in multichannel is multiplexing;
Each described local oscillator electrooptic modulator is connected to a described local oscillator wavelength division multiplexer, and each described local oscillator electrooptic modulator is used for carrying multiplexed signals to the first light described in a road and modulates a kind of radio-frequency (RF) local oscillator to generate a road first local oscillator multiplexed signals;
Described local oscillator allocation units comprise M local oscillator input and N number of local oscillator exports, each described local oscillator input is connected to a described local oscillator electrooptic modulator, and described local oscillator allocation units are configured to described first local oscillator multiplexed signals to export according to different channel allocation to corresponding described local oscillator thus make a described local oscillator export light described in output one tunnel carry local oscillator multiplexed signals.
In one embodiment, described optical modulator module comprises M radio frequency part light carrier multiplexer of corresponding M described frequency range, N number of radio frequency electrooptic modulator of corresponding N number of described passage and radio frequency light carrier allocation units, wherein:
Described radio frequency part light carrier multiplexer is connected with described lasing light emitter, each described radio frequency part light carrier multiplexer carries multiplexed signals for generating road second light, and the second light described in every road carries multiplexed signals and obtains by the described light carrier on all different passage of frequency range same in light carrier described in multichannel is multiplexing;
Described radio frequency light carrier allocation units comprise M light carrier input and N number of light carrier exports, each described light carrier input is connected to a described radio frequency part light carrier multiplexer, and described radio frequency light carrier allocation units are configured to described second light to carry described light carrier in multiplexed signals and export to corresponding described light carrier according to different channel allocation thus multiplexing the 3rd light obtained of described light carrier making a described light carrier export all different frequency ranges on the same passage of output one route carries multiplexed signals;
Described electrooptic modulator is connected to described Receiver Module and each described radio frequency electrooptic modulator is connected to a described light carrier output, and each described electrooptic modulator carries radio-frequency multiplexed signal for being carried on multiplexed signals by the 3rd light described in rf-signal modulation a to road described in a road of correspondence to generate light described in a road.
In one embodiment, utilize same wavelength division multiplexer and optical coupler to construct described radio frequency part light carrier multiplexer and described local oscillator wavelength division multiplexer, described device comprises M wavelength division multiplexer and M optical coupler, wherein:
Described wavelength division multiplexer is connected with described lasing light emitter, each described wavelength division multiplexer carries multiplexed signals for generating a road the 4th light, and the 4th light described in every road carries multiplexed signals and obtains by the described light carrier on all different passage of frequency range same in light carrier described in multichannel is multiplexing;
Each described optical coupler comprises an input and two outputs, the input of each described optical coupler is connected with a described wavelength division multiplexer, and described 4th light is carried multiplexed signals and is separated into identical two paths of signals and carries multiplexed signals and described first light as described second light and carry multiplexed signals and export by described optical coupler.
In one embodiment, described All-optical switching module comprises:
Mixing wavelength division multiplexer, it is connected with described full light frequency-variable module, exports for being carried after mixed frequency signal is multiplexed with a road by all described light;
Wavelength routing unit, it comprises the light be connected with described mixing wavelength division multiplexer and carries mixing input and multiple light carries signal output part, and each described light carries the described smooth information carrying number that signal output part exports a specific wavelength combination.
In one embodiment, described All-optical switching module also comprises route control unit, described route control unit carries to set each described light the wavelength value that signal output part exports for configuring the exchange regulation of selector switch in described Wavelength routing unit and signal bandwidth, thus realizes controlling the wavelength combinations that described light carries described smooth information carrying that signal output part exports number.
In one embodiment, described light carries the twice that the quantity of signal output part is described mixing wavelength division multiplexer input port quantity.
Compared with prior art, device volume of the present invention little, low in energy consumption, there is higher signal bandwidth; Meanwhile, can simple transformation handshaking pattern according to device of the present invention, thus meet switching requirement that is multi-functional, multiband.
Further feature of the present invention or advantage will be set forth in the following description.Further, Partial Feature of the present invention or advantage will be become apparent by specification, or be understood by implementing the present invention.Object of the present invention and certain advantages realize by step specifically noted in specification, claims and accompanying drawing or obtain.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification, with embodiments of the invention jointly for explaining the present invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the structure diagram of apparatus according to an embodiment of the present invention;
Fig. 2, Fig. 3 and Fig. 5 are the part-structure sketch according to device embodiment illustrated in fig. 1 respectively;
Fig. 4 is the schematic diagram of part-structure according to an embodiment of the invention;
Fig. 6 is the part-structure sketch of apparatus according to an embodiment of the present invention.
Embodiment
Embodiments of the present invention are described in detail below with reference to drawings and Examples, enforcement personnel of the present invention whereby can fully understand how application technology means solve technical problem in the present invention, and reach the implementation procedure of technique effect and specifically implement the present invention according to above-mentioned implementation procedure.It should be noted that, only otherwise form conflict, each embodiment in the present invention and each feature in each embodiment can be combined with each other, and the technical scheme formed is all within protection scope of the present invention.
In the prior art, traditional radio-frequency front-end shows deficiency in Insertion Loss, DC power, isolation, power handling capability and bandwidth etc.Further, in prior art, the solidification of radio-frequency front-end system, is unsuitable for multiband, many standard operations mode.
For the above-mentioned problems in the prior art, the present invention proposes a kind of restructural radio frequency front-end device supporting channels share.The present invention, introduce the method for Microwave photonics, the advantage of optics is utilized to solve the problem of radio-frequency front-end in signal broadband, isolation etc., radio-frequency channel is shared based on wavelength-division multiplex technique, in conjunction with the low damage frequency conversion of broadband Large Copacity, multi-frequency band radio-frequency signal, realize the integrated radio-frequency front end that high-isolation light carries wide band radio-frequency exchange.
Specifically, this patent is based on microwave photon technology, give full play to photon technology broadband, flexibly advantage, basic ideas are by radiofrequency signal and local oscillation signal shunt, recycling electrooptic modulator is modulated on light carrier respectively, utilize the output of photodetector to realize the beat frequency of radiofrequency signal and local oscillator by optical coupler, finally export intermediate-freuqncy signal.
Light signal has the broadband more than 50THz, and adopt the switching technology of microwave photon, core crosspoint realizes on light, can give full play to the broadband advantage of optical aid, makes radio frequency exchange possess very large signal bandwidth.
As shown in Figure 1, in one embodiment of this invention, device comprises Receiver Module 110, optical modulator module 120, light carry local oscillator module 130, full light frequency-variable module 140, All-optical switching module 150 and intermediate frequency output module 160.The input (input of Receiver Module 110) of the present embodiment is radiofrequency signal, and exporting (output of intermediate frequency output module 160) is intermediate-freuqncy signal.
In the present embodiment, device is the highest can support that the frequency conversion of the RF signal of N number of passage (each passage contains M frequency range) processes with exchange simultaneously.Therefore for receive and the Receiver Module 110 forwarding radiofrequency signal be configured to can receiving package containing maximum N number of passage and each passage comprises the radiofrequency signal of maximum M frequency range, wherein, M and N is non-zero natural number.
Next be all M × N road radiofrequency signal with input signal be example.Here it should be noted that, M × N road radiofrequency signal is the maximum magnitude that the device of the present embodiment can accept to process, but be not that the device of the present embodiment can only process this scope, when the band number of radiofrequency signal and port number are less than M × N, the device of the present embodiment also can process.In addition, in a particular embodiment of the present invention, the occurrence of M and N can set according to actual needs.
Optical modulator module 120 is connected with Receiver Module 110, carries out light modulation carry radiofrequency signal to generate and to export light for radio frequency signal.Light carries local oscillator module 130 and carries local oscillation signal for generating and exporting the light carrying radiofrequency signal corresponding with light.
Full light frequency-variable module 140 and optical modulator module 120 and light carry local oscillator module 130 and are connected, and carry local oscillation signal and carry out beat frequency for carrying radiofrequency signal and light to light and carry mixed frequency signal to realize full photomixing thus to generate and export light.
All-optical switching module 150 is connected with full light frequency-variable module 140, carries out handshaking to export the light information carrying number of specific wavelength combination for carrying mixed frequency signal to light.Intermediate frequency output module 160 is connected with All-optical switching module, for carrying out opto-electronic conversion to generate and to export intermediate-freuqncy signal to light information carrying number.
In order to reach the object of shared band, sharing channel.In the present embodiment, the light utilizing M radio-frequency (RF) local oscillator to produce N number of passage carries local oscillator multiplexed signals, and each passage has M light to carry local oscillation signal (a corresponding M frequency range).Concrete, light carries local oscillator module 130 and comprises N number of light and carry local oscillator output port, wherein, each light carries local oscillator output port and exports a road light and carry local oscillator multiplexed signals, and it is that the light of multiple different frequency ranges of corresponding same passage carries the multiplexing of local oscillation signal that a road light carries local oscillator multiplexed signals.
Generate local oscillation signal and first will construct the light source generating light carrier.Therefore, the device of the present embodiment also comprises lasing light emitter 111.Corresponding light all must be had to carry local oscillation signal because each road light carries radiofrequency signal (radiofrequency signal).Therefore corresponding M × N road radiofrequency signal, lasing light emitter 111 just needs to generate M × N road light carrier.Namely the band number identical with the radiofrequency signal received (the multi-path light carrier wave that lasing light emitter 111 generates comprises maximum N number of passage and each passage comprises maximum M frequency range) on the port number of multi-path light carrier wave that generates of lasing light emitter 111 and each passage.
Light carries local oscillator module 130 and comprises local oscillator wavelength division multiplexer set 131, local oscillator electrooptic modulator set 132 and local oscillator allocation units 133.Local oscillator wavelength division multiplexer set 131 comprises M local oscillator wavelength division multiplexer, it is connected with lasing light emitter 111, each local oscillator wavelength division multiplexer carries multiplexed signals for generating road first light, and every road first light carries multiplexed signals and obtains by the light carrier on all different passage of frequency range same in multi-path light carrier wave is multiplexing.
Local oscillator electrooptic modulator set 132 comprises M local oscillator electrooptic modulator, each local oscillator electrooptic modulator is connected to a local oscillator wavelength division multiplexer, and each local oscillator electrooptic modulator is used for carrying multiplexed signals to road first light and modulates a kind of radio-frequency (RF) local oscillator to generate a road first local oscillator multiplexed signals;
Local oscillator allocation units 133 comprise M local oscillator input and N number of local oscillator exports, and each local oscillator input is connected to a local oscillator electrooptic modulator.Local oscillator allocation units are configured to the first local oscillator multiplexed signals to export according to different channel allocation to corresponding local oscillator thus make a local oscillator export output one road light carry local oscillator multiplexed signals.
Adopt circulation wire gauge (cyclicAWG) to distribute local oscillator for one and realize the embodiment that light carries local oscillator module 130 (adopting cyclicAWG to construct local oscillator allocation units).As shown in Figure 2, local oscillator wavelength division multiplexer set 131 is connected to lasing light emitter 111.Lasing light emitter 111 comprises M × N number of light carrier generator (LD
1, LD
2lD
n, LD
n+1, LD
n+2... LD
2N, LD
2N+1... LD
m × N).M × N number of light carrier that M × N number of light carrier generator generates forms M the first light through M local oscillator wavelength division multiplexer (N × 1AWG) and carries multiplexed signals (each road first light carries multiplexed signals and obtains by N road light carrier is multiplexing).
The first via first light carries multiplexed signals can be expressed as (λ
1, λ
2..., λ
n);
Second tunnel first light carries multiplexed signals and can be expressed as (λ
n+1, λ
n+2..., λ
2N);
By that analogy, M road can be expressed as (λ
(M-1) N+1, λ
(M-1) N+2..., λ
mN).(λ represents an optical carrier in multiplexed signals, and its subscript represents wavelength numbering)
Each road first light carries multiplexed signals and uses local oscillator electrooptic modulator (EOM) to modulate a kind of radio-frequency (RF) local oscillator (LOm, LO represents radio-frequency (RF) local oscillator, mark m represents corresponding frequency range numbering, the value of m is got (1 ~ M)) to generate a road first local oscillator multiplexed signals, make each road first local oscillator multiplexed signals all be loaded with identical local oscillator.
The first via first local oscillator multiplexed signals 200 can be expressed as (λ
1 lO1, λ
2 lO1..., λ
n lO1);
Second tunnel first local oscillator multiplexed signals 201 can be expressed as (λ
n+1 lO2, λ
n+2 lO2..., λ
2N lO2);
By that analogy, M road (last road) first local oscillator multiplexed signals 202 can be expressed as
(λ
(M-1)N+1 LOM，λ
(M-1)N+2 LOM，…，λ
MN LOM)。(λ represents an optical carrier in multiplexed signals, and its subscript represents wavelength numbering, and subscript represents local oscillator numbering)
Local oscillator allocation units 133 (M × NAWG, M input, N number of output) there is the function (adopt circulation wire gauge (cyclicAWG)) of cyclic shift, namely the signal of each output port is from different input ports, also carries local oscillator be dispensed to different output ports with regard to achieving the identical light of each input port.
The first via light that local oscillator allocation units 133 export carries local oscillator multiplexed signals 210 and just can be expressed as
(λ
1 LO1，λ
N+1 LO2，…，λ
(M-1)N+1 LOM)；
Second road light carries local oscillator multiplexed signals 211 and can be expressed as
(λ
2 LO1，λ
N+2 LO2，…，λ
(M-1)N+2 LOM)；
By that analogy, N road light carries local oscillator multiplexed signals 212 and can be expressed as
(λ
N LO1，λ
2N LO2，…，λ
MN LOM)。(λ represents an optical carrier in multiplexed signals, and its subscript represents wavelength numbering, and subscript represents local oscillator numbering)
Thus, it is the multiplexing of M frequency range local oscillator that the light of each output carries local oscillator multiplexed signals, also realizes with regard to supporting same passage to carry out mixing needs to the radiofrequency signal of M different frequency range, reaches that local oscillator is shared, the object of channels share.
In the present embodiment, light carries radiofrequency signal generation and exports the design also using shared band, sharing channel.The multiplexing of multiple frequency range radiofrequency signal because each light carries radio-frequency channel, in order to realize multichannel full light frequency conversion (carrying radiofrequency signal and light to light to carry local oscillation signal and carry out beat frequency), need to ensure that the light of same channels corresponding frequency band carries radiofrequency signal and carries with its light the light carrier that local oscillator has phase co-wavelength.Therefore, what multichannel light carried radiofrequency signal multiplexingly should carry the multiplexing of local oscillation signal with multichannel light and have identical Wavelength Assignment scheme.Namely ensure that the light of same channels corresponding frequency band carries local oscillation signal identical with the wavelength that light carries radiofrequency signal.
In the present embodiment, optical modulator module 120 comprises N number of light and carries radio frequency output port, wherein, each light carries radio frequency output port and exports a road light and carry radio-frequency multiplexed signal, and it is that the light of multiple different frequency ranges of corresponding same passage carries the multiplexing of radiofrequency signal that a road light carries radio-frequency multiplexed signal.
Optical modulator module 120 comprises radio frequency part light carrier multiplexer set 121, radio frequency electrooptic modulator set 123 and radio frequency light carrier allocation units 122.In order to ensure the consistent of wavelength, radio frequency part light carrier multiplexer set 121 and local oscillator wavelength division multiplexer are connected to identical light source to receive the light carrier of unified wavelength.
Radio frequency part light carrier multiplexer set 121 is connected with lasing light emitter 111, and it comprises M radio frequency part light carrier multiplexer of a corresponding M frequency range.Each radio frequency part light carrier multiplexer carries multiplexed signals for generating road second light, and every road second light carries multiplexed signals and obtains by the light carrier on all different passage of frequency range same in multi-path light carrier wave is multiplexing.
Radio frequency light carrier allocation units 122 comprise M light carrier input and N number of light carrier exports.Each light carrier input is connected to a radio frequency part light carrier multiplexer.Radio frequency light carrier allocation units 122 are configured to the second light to carry light carrier in multiplexed signals and export to corresponding light carrier according to different channel allocation thus multiplexing the 3rd light obtained of light carrier making a light carrier export all different frequency ranges on the same passage of output one route carries multiplexed signals.
Radio frequency electrooptic modulator set 123 comprises N number of radio frequency electrooptic modulator of corresponding N number of passage, radio frequency electrooptic modulator set 123 is connected to Receiver Module 110 and each radio frequency electrooptic modulator is connected to a light carrier output, and each electrooptic modulator carries radio-frequency multiplexed signal for being carried on multiplexed signals to a road the 3rd light by a road rf-signal modulation of correspondence to generate a road light.
Continuing to adopt cyclicAWG to distribute local oscillator (adopt cyclicAWG construct local oscillator allocation units), to realize the embodiment that light carries local oscillator module 120 be example.As shown in Figure 3, radio frequency part light carrier multiplexer set 121 is connected to lasing light emitter 111.Lasing light emitter 111 comprises M × N number of light carrier generator (LD
1, LD
2lD
n, LD
n+1, LD
n+2... LD
2N... LD
m × N).M × N number of light carrier that M × N number of light carrier generator generates forms M the second light through M radio frequency part light carrier multiplexer (N × 1AWG) and carries multiplexed signals (each road second light carries multiplexed signals and obtains by N road light carrier is multiplexing).
The first via second light carries multiplexed signals can be expressed as (λ
1, λ
2..., λ
n);
Second tunnel second light carries multiplexed signals and can be expressed as (λ
n+1, λ
n+2..., λ
2N);
By that analogy, M road can be expressed as (λ
(M-1) N+1, λ
(M-1) N+2..., λ
mN).(λ represents an optical carrier in multiplexed signals, and its subscript represents wavelength numbering)
Utilize radio frequency light carrier allocation units 122 (cyclicAWG) (M × NAWG identical with local oscillator allocation units 133, M input, N number of output) realize cyclic shift, the 3rd light of the wavelength combinations obtaining carrying with light local oscillator multiplexed signals identical (compared with Wavelength Assignment do not modulate local oscillator) carries multiplexed signals.3rd light carries the radio frequency electrooptic modulator (EOM) of multiplexed signals through radio frequency electrooptic modulator set 123, radiofrequency signal (the RFn of a passage is modulated on each road, RF represents radiofrequency signal, and label n represents corresponding channel number, and the value of n gets 1 ~ N).
Radio frequency electrooptic modulator set 123 exports first via light and carries radio-frequency multiplexed signal 310 and just can be expressed as
(λ
1 RF1，λ
N+1 RF1，…，λ
(M-1)N+1 RF1)；
The light that second tunnel exports carries radio-frequency multiplexed signal 311 and can be expressed as
(λ
2 RF2，λ
N+2 RF2，…，λ
(M-1)N+2 RF2)；
By that analogy, the light that N road exports carries radio-frequency multiplexed signal 312 and can be expressed as
(λ
N RFN，λ
2N RFN，…，λ
MN RFN)。
Comprise N number of beat frequency coupler in full light frequency-variable module 140, each beat frequency coupler comprises two inputs and an output.Two inputs of each beat frequency coupler are connected respectively to a radio frequency electrooptic modulator of corresponding same passage and of local oscillator allocation units exports.It carries radio-frequency multiplexed signal and light to the light of the same passage of correspondence and carries local oscillator multiplexed signals and carry out beat frequency and carry mixed frequency signal to export light.
The present invention adopts general optical frequency mixing structure to realize full light frequency-variable module 140, does not limit to serial, parallel organization.The optical frequency variable theory structure used in an embodiment of the present invention as shown in Figure 4 (parallel-connection structure).The light carrier that lasing light emitter LD launches is transmitted into two electrooptic modulators (EOM) respectively by after fiber coupler (Coupler) 401 light splitting.Radiofrequency signal RF and local oscillation signal LO are modulated on light carrier respectively by EOM and are coupled, and carry out beat frequency by fiber coupler (Coupler) 402, eventually pass through photoelectric detector PD and export medium frequency electric signal.
Electrooptic modulator, except Mach-Zehnder modulator (MZM), can also use phase-modulator (PM) etc.Use different cascade structures, optics, the aspects such as property indices such as phase noise, isolation, the stability of optical frequency mixing there are differences.Device index, environmental impact and use scenes should be considered in specific design, make a choice.
In the embodiment shown in fig. 1, All-optical switching module 150 comprises mixing wavelength division multiplexer 151 and Wavelength routing unit 152.Mixing wavelength division multiplexer 151 is connected with full light frequency-variable module 140, exports for being carried by all light after mixed frequency signal is multiplexed with a road; Wavelength routing unit 152 comprises the light be connected with mixing wavelength division multiplexer and carries mixing input and multiple light carries signal output part, and each light carries the light information carrying number that signal output part exports a specific wavelength combination.
Further, in the present embodiment, All-optical switching module 150 also comprises route control unit 153.Route control unit 153 carries to set each light the wavelength value that signal output part exports for configuring the exchange regulation of selector switch in Wavelength routing unit 152 and signal bandwidth, thus realizes controlling the wavelength combinations that light carries light information carrying that signal output part exports number.
Concrete, as shown in Figure 5, all input optical signals are multiplexed with a road by mixing wavelength division multiplexer 151, are input to Wavelength routing unit 152.Control unit 153 receives user instruction, configures exchange regulation and the signal bandwidth of the selector switch of Wavelength routing unit 152 in real time, by setting the wavelength value that each output port exports, realizes the light signal that arbitrary port exports any wavelength combinations.When needing the routing rule of the wavelength-selective switches changing Wavelength routing unit 152, only needing Reconfigurations instruction just can realize new switch mode, completing the reconstruct of function of exchange, meeting switching requirement that is multi-functional, multiband.
Microwave photon technology introduces this single-degree-of-freedom of wavelength, produces and shares local oscillator, can realize multichannel, multiband frequency conversion easily based on wavelength-division multiplex technique.The utilance that local oscillator is shared, multichannel frequency conversion simultaneously improves resource greatly, reduces the volume of integrated radio-frequency front end, power consumption etc.
Device of the present invention utilizes the reconfigurable handshaking of optics switching matrix practical function.Control panel receives user instruction, configures exchange regulation and the signal bandwidth of Wavelength routing selector switch in real time, by setting the wavelength value that each output port exports, realizes the light signal that arbitrary port exports any wavelength combinations.When needing the routing rule changing wavelength-selective switches, only needing Reconfigurations instruction just can realize new switch mode, completing the reconstruct of function of exchange, meeting switching requirement that is multi-functional, multiband.
In the present embodiment, the effect of mixing wavelength division multiplexer 151 is a road by the optical signal from full light frequency-variable module 140, can adopt wavelength division multiplexer to realize, such as the AWG of N × 1.
Wavelength routing unit 152 can adopt the wavelength-selective switches (WavelengthSelectiveSwitch, WSS) of 1 × 2N to realize.WSS is based on liquid crystal on silicon (LCoS) technology, by liquid crystal on silicon controller being the selection of WSS output port to optical wavelength from the instruction morphing of custom system, finally realize the conversion of programming Control optical wavelength routing, and broadcast and multicast functionality can be realized.Control unit receives user instruction via control interface, in real time the exchange regulation of configuration Wavelength routing selector switch, and the wavelength value that each output port of control wave long route unit exports and signal bandwidth, realize the light signal that arbitrary port exports any wavelength combinations.The control of Wavelength routing unit reception control unit, outputs to different output port by after input optical signal Route Selection.
Further, in order to realize the support of redundancy backup, the port number that the light of Wavelength routing unit 152 carries signal output part should be the twice (2N) of the input port number (the output port number N of full light frequency-variable module 140) of mixing wavelength division multiplexer 151.
Intermediate frequency output module 160 comprises multiple (2N) medium frequency output end mouth, and all medium frequency output end mouths are configured to the intermediate-freuqncy signal exporting unified frequency.The light-receiving of intermediate frequency output module 160 can select simple photoelectric detector PD, also can select balance photodetector BPD.
Based on the device shown in Fig. 1, final signal processing flow is:
Receiver Module 110 receives M × N road radiofrequency signal, i.e. N number of passage, and each passage contains M frequency range.The light that the light modulation that optical modulator module 120 completes radio frequency signal generates N number of passage carries radio-frequency multiplexed signal, and each passage has M light to carry radiofrequency signal (a corresponding M frequency range).Light carries the light that local oscillator module 130 utilizes M radio-frequency (RF) local oscillator to produce N number of passage and carries local oscillator multiplexed signals, and each passage has M local oscillation signal (a corresponding M frequency range).Both have identical Wavelength Assignment scheme.
Light carries local oscillator multiplexed signals and carries radio-frequency multiplexed signal being coupled by full light frequency-variable module 140 with light, realizes beat frequency, and the light obtaining intermediate frequency carries mixed frequency signal.
The conversion process of wavelength combinations is described for the first via.First via light carries local oscillator multiplexed signals and is expressed as
(λ
1 LO1，λ
N+1 LO2，…，λ
(M-1)N+1 LOM)，
First via light carries radio-frequency multiplexed signal indication
(λ
1 RF1，λ
N+1 RF1，…，λ
(M-1)N+1 RF1)。
Light information carrying λ
1 lO1with λ
1 rF1the beat frequency radiofrequency signal that can only realize frequency range 1 change to intermediate frequency, be expressed as λ
1 iF11(subscript IF11 represents the intermediate frequency of the 1st passage the 1st frequency range, namely IFij represents the intermediate frequency of i-th passage jth frequency range), with the beat frequency of other frequency ranges due to away from intermediate frequency, can be filtered when exchanging (input, the output wavelength of optical exchanger part WSS are range limited) through light.
Therefore, first via frequency conversion (beat frequency) exports and can be expressed as
(λ
1 IF11，λ
N+1 IF12，…，λ
(M-1)N+1 IF1M)；
The frequency conversion (beat frequency) on the second tunnel exports and can be expressed as
(λ
2 IF21，λ
N+2 IF22，…，λ
(M-1)N+2 IF2M)。
Any exchange that All-optical switching module 150 realizes M × N road light information carrying of exporting above-mentioned frequency conversion number is selected to export, and the signal of each output port is the combination of any frequency range from arbitrary input channel.And support redundancy backup, accomplish the dynamic restructuring of exchange regulation according to the configuration of control unit.
Signal after exchange carries out the radiofrequency signal that opto-electronic conversion (intermediate frequency output module 160) becomes unified intermediate frequency, and intermediate frequency output module 160 exports 2N port, and each port is the combination of multiple frequency range intermediate-freuqncy signal.
Comparison diagram 2 and Fig. 3 can find out, the function that radio frequency part light carrier multiplexer set 121 and local oscillator wavelength division multiplexer set 131 realize is identical.In order to simplification device structure, in an embodiment of the present invention, same set of hardware system is adopted to construct radio frequency part light carrier multiplexer set and the set of local oscillator wavelength division multiplexer.
Take input signal as M × N road radiofrequency signal be example.Construct M wavelength division multiplexer and M optical coupler.Wavelength division multiplexer is connected with lasing light emitter, and each wavelength division multiplexer carries multiplexed signals for generating a road the 4th light, and every road the 4th light carries multiplexed signals and obtains by the light carrier on all different passage of frequency range same in multi-path light carrier wave is multiplexing.
The first via the 4th light carries multiplexed signals and can be expressed as (λ
1, λ
2..., λ
n);
Second tunnel the 4th light carries multiplexed signals and can be expressed as (λ
n+1, λ
n+2..., λ
2N);
By that analogy, M road can be expressed as (λ
(M-1) N+1, λ
(M-1) N+2..., λ
mN).(λ represents an optical carrier in multiplexed signals, and its subscript represents wavelength numbering) (carry multiplexed signals and the second light with the first light to carry multiplexed signals identical).
Each optical coupler comprises an input and two outputs, the input of each optical coupler is connected with a wavelength division multiplexer, and the 4th light is carried multiplexed signals and is separated into identical two paths of signals and carries multiplexed signals and the first light as the second light and carry multiplexed signals and export by optical coupler.
Namely two outputs of optical coupler are connected respectively to a light carrier input of local oscillator electrooptic modulator and radio frequency light carrier allocation units.Two signals exported of optical coupler are the 4th light and carry multiplexed signals.
As shown in Figure 6, device comprises wavelength division multiplexer set 601 and optical coupler set 602.
M wavelength division multiplexer (N × 1AWG) is configured with in wavelength division multiplexer set 601.Lasing light emitter 111 comprises M × N number of light carrier generator (LD
1, LD
2lD
n, LD
n+1, LD
n+2... LD
2N... LD
m × N).Each wavelength division multiplexer (N × 1AWG) in wavelength division multiplexer set 601 is connected with N number of light carrier generator of the same frequency range of lasing light emitter,
Be configured with M optical coupler in optical coupler set 602, each optical coupler comprises an input and two outputs.The input of each optical coupler is connected with a wavelength division multiplexer; Two outputs of an optical coupler are connected respectively to a light carrier input of a local oscillator electrooptic modulator in local oscillator electrooptic modulator set 132 and radio frequency light carrier allocation units 122.
Based on said structure, only need to construct a set of wavelength division multiplexer and just can realize the supply that light that optical modulator module and light carries local oscillator module carries multiplexed signals.Thus enormously simplify the structure of device.
To sum up, radio frequency front-end device of the present invention supports the radiofrequency signal frequency conversion of multichannel, multiband, does not need the equal configurable number word processor of each passage, by the radio frequency exchange common numbers processing unit of dynamic reconfigurable.And compatible Band-pass Sampling Technology, with the radiofrequency signal of the ADC process broadband of low performance, high speed.Compared with prior art, device volume of the present invention little, low in energy consumption, there is higher signal bandwidth; Meanwhile, can simple transformation handshaking pattern according to device of the present invention, thus meet switching requirement that is multi-functional, multiband.
Although execution mode disclosed in this invention is as above, the execution mode that described content just adopts for the ease of understanding the present invention, and be not used to limit the present invention.Method of the present invention also can have other various embodiments.When not deviating from essence of the present invention, those of ordinary skill in the art are when making various corresponding change or distortion according to the present invention, but these change accordingly or are out of shape the protection range that all should belong to claim of the present invention.
Claims (10)
1. support a restructural radio frequency front-end device for channels share, it is characterized in that, described device comprises:
Receiver Module, it is for receiving and forwarding radiofrequency signal, and described radiofrequency signal comprises maximum N number of passage and each passage comprises maximum M frequency range, and wherein, M and N is non-zero natural number;
Optical modulator module, it is connected with described Receiver Module, carries radiofrequency signal for carrying out light modulation to described radiofrequency signal to generate and to export light;
Light carries local oscillator module, and it carries local oscillation signal for generating and exporting the light carrying radiofrequency signal corresponding with described light, and it is identical with the wavelength that described light carries radiofrequency signal that the described light of same channels corresponding frequency band carries local oscillation signal;
Full light frequency-variable module, it carries local oscillator module with described optical modulator module and described light and is connected, and carries local oscillation signal carry out beat frequency to realize full photomixing thus to generate and the light exporting intermediate frequency carries mixed frequency signal for carrying radiofrequency signal and described light to described light;
All-optical switching module, it is connected with described full light frequency-variable module, carries out handshaking to export the light information carrying number of specific wavelength combination for carrying mixed frequency signal to described light;
Intermediate frequency output module, it is connected with described All-optical switching module, for carrying out opto-electronic conversion to generate and to export intermediate-freuqncy signal to described smooth information carrying number.
2. device according to claim 1, is characterized in that, described intermediate frequency output module comprises multiple medium frequency output end mouth, and all described medium frequency output end mouths are configured to the described intermediate-freuqncy signal exporting unified frequency.
3. device according to claim 1, is characterized in that:
Described optical modulator module comprises N number of light and carries radio frequency output port, wherein, each described light carries radio frequency output port and exports a road light and carry radio-frequency multiplexed signal, and it is that the described light of multiple different frequency ranges of corresponding same passage carries the multiplexing of radiofrequency signal that light described in a road carries radio-frequency multiplexed signal;
Described light carries local oscillator module and comprises N number of light and carry local oscillator output port, wherein, each described light carries local oscillator output port and exports a road light and carry local oscillator multiplexed signals, and it is that the described light of multiple different frequency ranges of corresponding same passage carries the multiplexing of local oscillation signal that light described in a road carries local oscillator multiplexed signals.
4. device according to claim 3, it is characterized in that, described device also comprises lasing light emitter, described lasing light emitter is for generating the multi-path light carrier wave of corresponding described radiofrequency signal, wherein, the frequency range band number that comprises of the port number that comprises of light carrier described in multichannel and each passage is identical with described radiofrequency signal.
5. device according to claim 4, is characterized in that, described light carries local oscillator module and comprises M local oscillator wavelength division multiplexer, a M local oscillator electrooptic modulator and local oscillator allocation units, wherein:
Described local oscillator wavelength division multiplexer is connected with described lasing light emitter, each described local oscillator wavelength division multiplexer carries multiplexed signals for generating road first light, and the first light described in every road carries multiplexed signals and obtains by the described light carrier on all different passage of frequency range same in light carrier described in multichannel is multiplexing;
Each described local oscillator electrooptic modulator is connected to a described local oscillator wavelength division multiplexer, and each described local oscillator electrooptic modulator is used for carrying multiplexed signals to the first light described in a road and modulates a kind of radio-frequency (RF) local oscillator to generate a road first local oscillator multiplexed signals;
Described local oscillator allocation units comprise M local oscillator input and N number of local oscillator exports, each described local oscillator input is connected to a described local oscillator electrooptic modulator, and described local oscillator allocation units are configured to described first local oscillator multiplexed signals to export according to different channel allocation to corresponding described local oscillator thus make a described local oscillator export light described in output one tunnel carry local oscillator multiplexed signals.
6. device according to claim 5, it is characterized in that, described optical modulator module comprises M radio frequency part light carrier multiplexer of corresponding M described frequency range, N number of radio frequency electrooptic modulator of corresponding N number of described passage and radio frequency light carrier allocation units, wherein:
Described radio frequency part light carrier multiplexer is connected with described lasing light emitter, each described radio frequency part light carrier multiplexer carries multiplexed signals for generating road second light, and the second light described in every road carries multiplexed signals and obtains by the described light carrier on all different passage of frequency range same in light carrier described in multichannel is multiplexing;
Described radio frequency light carrier allocation units comprise M light carrier input and N number of light carrier exports, each described light carrier input is connected to a described radio frequency part light carrier multiplexer, and described radio frequency light carrier allocation units are configured to described second light to carry described light carrier in multiplexed signals and export to corresponding described light carrier according to different channel allocation thus multiplexing the 3rd light obtained of described light carrier making a described light carrier export all different frequency ranges on the same passage of output one route carries multiplexed signals;
Described electrooptic modulator is connected to described Receiver Module and each described radio frequency electrooptic modulator is connected to a described light carrier output, and each described electrooptic modulator carries radio-frequency multiplexed signal for being carried on multiplexed signals by the 3rd light described in rf-signal modulation a to road described in a road of correspondence to generate light described in a road.
7. device according to claim 6, it is characterized in that, utilize same wavelength division multiplexer and optical coupler to construct described radio frequency part light carrier multiplexer and described local oscillator wavelength division multiplexer, described device comprises M wavelength division multiplexer and M optical coupler, wherein:
Described wavelength division multiplexer is connected with described lasing light emitter, each described wavelength division multiplexer carries multiplexed signals for generating a road the 4th light, and the 4th light described in every road carries multiplexed signals and obtains by the described light carrier on all different passage of frequency range same in light carrier described in multichannel is multiplexing;
Each described optical coupler comprises an input and two outputs, the input of each described optical coupler is connected with a described wavelength division multiplexer, and described 4th light is carried multiplexed signals and is separated into identical two paths of signals and carries multiplexed signals and described first light as described second light and carry multiplexed signals and export by described optical coupler.
8. the device according to any one of claim 1-7, is characterized in that, described All-optical switching module comprises:
Mixing wavelength division multiplexer, it is connected with described full light frequency-variable module, exports for being carried after mixed frequency signal is multiplexed with a road by all described light;
Wavelength routing unit, it comprises the light be connected with described mixing wavelength division multiplexer and carries mixing input and multiple light carries signal output part, and each described light carries the described smooth information carrying number that signal output part exports a specific wavelength combination.
9. device according to claim 8, it is characterized in that, described All-optical switching module also comprises route control unit, described route control unit carries to set each described light the wavelength value that signal output part exports for configuring the exchange regulation of selector switch in described Wavelength routing unit and signal bandwidth, thus realizes controlling the wavelength combinations that described light carries described smooth information carrying that signal output part exports number.
10. device according to claim 9, is characterized in that, the quantity that described light carries signal output part is the twice of described mixing wavelength division multiplexer input port quantity.
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