CN110233676A - Radio-frequency channel method and realization device based on light comb double modulation sideband - Google Patents
Radio-frequency channel method and realization device based on light comb double modulation sideband Download PDFInfo
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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
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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
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Abstract
The invention discloses a kind of radio-frequency channel method and realization device based on light comb double modulation sideband.Method includes: that generation coherent signal light and local oscillator light, signal light comb generation module are divided into FSR between modulating comb teethsignalLight comb, local oscillator light comb generation module is divided into FSR between modulating comb teethlocalLight comb, modulation module is based on signal light comb and is modulated to RF signal, then handled by filter filtering, after carrying out channel division based on filter output signal and local oscillator light comb, then carries out coherent reception processing.Device includes: coherent light generation module, signal light comb generation module, local oscillator light comb generation module, modulation module, periodic filter, channel separation module and Coherent processing module.The present invention can reduce the comb teeth interval of local oscillator light comb, reduce the requirement to signal light comb comb teeth quantity, improve capacity usage ratio, reduce channelizing difficulty.
Description
Technical field
The present invention relates to optical communication field, especially a kind of radio-frequency channel method and reality based on light comb double modulation sideband
Existing device.
Background technique
Frequency channelization is that frequency range is divided into several frequency sub-band-letters by the filter of one group of entire frequency range of covering
Road.CN108650013A discloses a kind of channelizing system based on optical frequency shift, which is not necessarily to light comb signal generator, still
Channel quantity is directly proportional to the quantity of optical frequency shift module, needs to use about N/2 optical frequency shift module to N number of channel.Optical frequency shifting formwork
Block is realized that the control difficulty of cost and the inhibition of single-side belt carrier wave is higher by DPMZM.And relevant optical frequency comb claps the scheme of difference
When channel quantity is more, system scale is smaller, i.e. the reusability of device is stronger.CN102638302B discloses a kind of based on phase
The channelizing broadband multi-frequency measuring system of dry optical frequency comb, for accurately measuring rf frequency.It specifically uses comb teeth interval
It is poor to clap for the signal light frequency comb of 39.5GHz and the local oscillator optical frequency comb of 40GHz, due to signal light frequency comb and local oscillator light frequency
The difference of the Free Spectral Range of comb, the radiofrequency signal at different frequent points are divided into different channels.The program needs and channel
The signal light comb of equivalent realizes the channelizing of radio frequency, and cost and realization difficulty are higher.Broadband photonic radio-
frequency channelization based on a 39GHz optical frequency comb,IEEE
Photonics Technology letters, vol.24, No.8,2012, XiaojunXie, Yitang Dai, Yu Ji,
Etc. disclosed scheme is main are as follows: microwave signal is modulated to the light comb that 39GHz is divided between comb teeth by Double Sideband Suppressed Carrier
Upper multicast carries out periodic filter to multicast signal using the FP filter for being divided into 40GHz between comb teeth.First comb teeth of light comb
13GHz is differed with first filter pass band centre frequency of filter.In demultiplexing, using channel identical with FP filter
Interval, i.e., the wavelength demultiplexer of 40GHz separates each channel.These can make in the radio-frequency carrier that area of light completes channelizing
Intermediate frequency output is down-converted to PD direct detection or by coherent detection.It is specifically mentioned in the document, RF signal is in light comb
After multicast, the carrier wave sideband of only red shift is used as channelizing processing, and the carrier wave sideband of blue shift cannot be filtered by the FP in scheme
Wave device is only capable of carrying out channelizing processing using unilateral carrier wave, capacity usage ratio is not high.
Summary of the invention
Goal of the invention of the invention is: in view of the above problems, providing a kind of based on light comb double modulation sideband
Radio-frequency channel method and realization device.To solve only to have used capacity usage ratio caused by single sideband is not high to ask in the prior art
Topic；Also reduce the comb teeth interval of local oscillator light comb, alleviate during light comb generates, under flat comb teeth quantity increase with comb teeth interval
And the problem of reducing.
The technical solution adopted by the invention is as follows:
Radio-frequency channel method based on light comb double modulation sideband, comprising:
Relevant signal light and local oscillator light are transmitted separately to signal light comb generation module and local oscillator light comb generation module；
Signal light comb generation module is modulated the signal light received, is divided into FSR between generation comb teethsignalSignal
Light comb is output to modulation module；
Local oscillator light comb generation module is modulated the signal light received, is divided into FSR between generation comb teethlocalLocal oscillator light
Comb, being output to channel spacing is FSRlocalChannel separation module；
Modulation module is based on signal light comb, and after being modulated to RF signal to be processed, being output to the period is FSRlocal's
Periodical light filter module is filtered；
The optical signal and local oscillator light comb that channel separation module is exported based on periodical light filter module, carry out channel division；
Coherent reception processing is carried out to the optical signal after division channel, exports the signal of each subchannel；
Wherein, FSRsignalMinimum frequency, maximum frequency and the channel width of expectation based on RF signal to be processed produce
It is raw, FSRlocalMinimum frequency and maximum frequency based on RF signal to be processed generate, or the channel width also based on expectation produces
It is raw.
Through the above scheme, it is ensured that two sidebands up and down of periodical optical filter continuous acquisition to signal light comb,
The shortcomings that being only filtered to up or down sideband in traditional scheme is overcome, sideband energy invalid in traditional scheme is used
Come, improves capacity usage ratio.Also, be utilized as reducing signal comb teeth quantity and the local oscillator comb teeth interval of double-side band carrier wave are mentioned
Having supplied may.
Further,
FSRsignal=2f1+2f2+2fBW (1)
FSRlocal=f1+f2+2fBW (2)
Or
FSRlocal=f1+f2 (3)
fBWFor the channel width of expectation, f1For the minimum frequency of RF signal to be processed, if channel quantity is even number, f2
For the maximum frequency of RF signal to be processed, if channel quantity is odd number, f2Maximum frequency for RF signal to be processed subtracts
fBW。
Conventional method local oscillator comb teeth interval and signal comb teeth interval are close, are divided into signal between the local oscillator comb teeth that the present invention uses
The half or so at comb teeth interval, it can reduce the cost of implementation of local oscillator light comb and realize difficulty.Meanwhile it reducing to signal light comb
The comb teeth quantity demand of generation module.
Further, signal light comb generation module also hands over the light comb of generation before output light tooth to modulation module
Mistake filtering filters out the light comb that order is odd number and exports.
The program can reduce the requirement at the light comb comb teeth interval to the output of signal light comb generation module.
The present invention also provides a kind of, and the radio-frequency channel makeup based on light comb double modulation sideband is set comprising: coherent light produces
Raw module, signal light comb generation module, local oscillator light comb generation module, modulation module, periodic filter, channel separation module with
And Coherent processing module；Coherent light generation module is separately connected signal light comb generation module and local oscillator light comb generation module, by phase
Dry signal light and local oscillator light is transmitted separately to signal light comb generation module and local oscillator light comb generation module；Signal light comb generates mould
Block is divided into FSR between generating comb teethsignalLight comb, signal light comb generation module is connected to the light input end of modulation module；It is to be processed
RF signal input modulation module RF input terminal；It is received to RF input terminal that modulation module is based on the received data of light input end
Data are modulated, and the output end of modulation module and period are FSRlocalPeriodical optical filter, channel spacing FSRlocal
Channel separation module be sequentially connected；Local oscillator light comb generation module is divided into FSR between generating comb teethlocalLight comb, output end also connects
Connect the input terminal of the channel separation module；The output end of channel separation module connects the Coherent processing module, Coherent processing
Module carries out Coherent processing to received data；FSRsignalMinimum frequency, maximum frequency and phase based on RF signal to be processed
It is generated to channel width, FSRlocalMinimum frequency and maximum frequency based on RF signal to be processed generate, or also based on expectation
Channel width generate.
Above scheme does not increase excessive additional facility on the basis of conventional method, only adjusts frequency or time parameter,
To reach improvement purpose, implementation method is simple, can simplify existing system.
Further,
FSRsignal=2f1+2f2+2fBW (1)
FSRlocal=f1+f2+2fBW (2)
Or
FSRlocal=f1+f2 (3)
fBWFor the channel width of expectation, f1For the minimum frequency of RF signal to be processed, if channel quantity is even number, f2
For the maximum frequency of RF signal to be processed, if channel quantity is odd number, f2Maximum frequency for RF signal to be processed subtracts
fBW。
After above scheme, it is ensured that period FSRlocalPeriodical optical filter continuous acquisition to signal light comb
Two sidebands up and down.Being aided with the period again is FSRlocalLocal oscillator light comb, channel spacing be equal to FSRlocalChannel separation module
It can complete the physical separation of each channel.
Further, it further includes interleaver that radio-frequency channel makeup, which is set, which is connected to letter
Number between light comb generation module and modulation module, filters out the odd number light comb in input signal and export；Signal light comb generates mould
The comb teeth interval of generated light comb is adjusted to FSR by blocksignalAfter/2, then it is input to the interleaver.
Above scheme can further decrease the comb teeth space requirements to signal light comb generation module.
Further, above-mentioned coherent light generation module includes: sequentially connected laser, electrooptic modulator, erbium-doped fiber
Amplifier, fiber coupler, and the first optical filter and optical filter that are connect respectively with fiber coupler；Electro-optical Modulation
The rf inputs mouth of device connects microwave signal source, and direct-flow input end mouth connects direct current biasing and controls signal.
Further, signal light comb generation module includes: electro-optic phase modulator, intensity modulator, signal source, is electrically coupled
Device, the first radio frequency amplifier, phase shifter, the second radio frequency amplifier, bias control circuit；Electro-optic phase modulator and intensity modulated
Device series connection；Signal source is separately connected the input terminal of two radio frequency amplifiers after electric coupler；The output of first radio frequency amplifier
The input terminal of end connection phase shifter；The prevention at radio-frequency port of phase shifter connection phase-modulator；The output end of second radio frequency amplifier connects
Connect the prevention at radio-frequency port of intensity modulator；The bias control terminal mouth of bias control circuit bonding strength modulator.
Further, the construction of local oscillator light comb generation module is identical as signal light comb generation module, and distinctive points are local oscillator
The frequency of the microwave signal of the signal source output of light comb generation module and the difference of signal light comb generation module.
Above scheme makes that device simple structure, cost is relatively low, is easily installed and safeguards.
In conclusion by adopting the above-described technical solution, the beneficial effects of the present invention are:
1, the present invention is poor by adjusting the comb teeth interval of signal light comb and local oscillator light comb, changes the period of periodic filter
Equal relevant parameters can simplify the RF channelization scheme that tradition claps difference based on relevant light comb.In terms of hardware realization, in tradition side
It does not need to increase or change additional device on the basis of case, existing system can be simplified, transformation or installation are simple.
2, since the comb teeth interval of light comb generation module output is bigger, comb teeth flatness is more difficult to ensure.The present invention uses
Local oscillator comb teeth between be divided into the half or so at signal comb teeth interval, overcome conventional method local oscillator and signal comb teeth interval be close
Problem can reduce the cost of implementation of local oscillator light comb and realize difficulty.
3, it due to using double sideband modulation, at most can support to realize the letter in N number of channel using N-1 root signal comb teeth
Road, and conventional method needs N root signal comb teeth to realize the channelizing in N number of channel, therefore the present invention can reduce to signal light
Comb the comb teeth quantity demand of generation module.
4, it since the double sideband modulation of signal light comb has been involved in the processing such as channelizing filtering, overcomes in traditional scheme only
Sideband energy invalid in traditional scheme is used, improves energy utilization by the shortcomings that being filtered to up or down sideband
Rate.
Detailed description of the invention
Examples of the present invention will be described by way of reference to the accompanying drawings, in which:
Fig. 1 and 2 is the different embodiments of two channel devices of the present invention respectively.
Fig. 3 be signal light comb comb teeth between be divided into existing lower sideband mixing schematic diagram when 25.5GHz.
Fig. 4 is channelizing processing frequency domain schematic diagram of the prior art based on relevant light comb.
Fig. 5 is the frequency domain schematic diagram (FSR that channelizing proposed by the present invention handles one embodimentlocal=24GHz,
FSRsignal=49GHz).
Fig. 6 is the frequency domain schematic diagram (FSR that channelizing proposed by the present invention handles another embodimentlocal=25GHz,
FSRsignal=49GHz).
Specific embodiment
All features disclosed in this specification or disclosed all methods or in the process the step of, in addition to mutually exclusive
Feature and/or step other than, can combine in any way.
Any feature disclosed in this specification (including any accessory claim, abstract), unless specifically stated,
It is replaced by other equivalent or with similar purpose alternative features.That is, unless specifically stated, each feature is a series of
An example in equivalent or similar characteristics.
Embodiment one
Present embodiment discloses the improved methods of a kind of pair of radio-frequency channelization processing, specially setting signal light comb and local oscillator
The comb teeth interval of light comb, specifically:
FSRsignal=2f1+2f2+2fBW (1)
FSRlocal=f1+f2+2fBW (2)
Or
FSRlocal=f1+f2 (3)
Wherein, FSRsignalFor the comb teeth interval of signal light comb, FSRlocalFor the comb teeth interval of local oscillator light comb, fBWTo expect
Channel width, f1For the minimum frequency of RF signal to be processed, if channel quantity is even number, f2For RF signal to be processed
Maximum frequency, if channel quantity is odd number, f2Maximum frequency for RF signal to be processed subtracts fBW。
After above formula, it is ensured that period FSRlocalPeriodical optical filter continuous acquisition to signal light comb
Two sidebands up and down.Being aided with the period again is FSRlocalLocal oscillator light comb, channel spacing be equal to FSRlocalChannel separation module
It can complete the physical separation of each channel.
Embodiment two
Present embodiment discloses a kind of radio-frequency channel methods based on light comb double modulation sideband, comprising:
Relevant signal light and local oscillator light are transmitted separately to signal light comb generation module and local oscillator light comb generation module；
Signal light comb generation module is modulated the signal light received, is divided into FSR between generation comb teethsignalLight comb,
It is output to modulation module；
Local oscillator light comb generation module is modulated the local oscillator light received, is divided into FSR between generation comb teethlocalLight comb,
Being output to channel spacing is FSRlocalChannel separation module；
The optical signal that modulation module is sent based on signal light comb generation module, after being modulated to RF signal to be processed,
Being output to the period is FSRlocalPeriodical light filter module be filtered；
Optical signal and local oscillator light comb the generation module output that channel separation module is exported based on periodical light filter module
Optical signal carries out channel division；
Coherent processing (as carried out photoelectric conversion) is carried out to the optical signal after division channel, exports the signal of each subchannel；
Wherein, FSRsignalMinimum frequency, maximum frequency and the channel width of expectation based on RF signal to be processed produce
It is raw, FSRlocalMinimum frequency and maximum frequency based on RF signal to be processed generate, or the channel width also based on expectation produces
It is raw.
In one embodiment, FSRsignalAnd FSRlocalCalculation method be embodiment one in improved method.
In another embodiment, signal light comb generation module is before output light tooth to modulation module, also to the light of generation
Comb is staggeredly filtered, i.e., the comb teeth interval of signal light comb is become FSRsignal/ 2, and filter out odd number order (the 1st, 3,
5 ... numbers light combs) light comb output.
Embodiment three
Referring to attached drawing 1, present embodiment discloses a kind of, and the radio-frequency channel makeup based on light comb double modulation sideband is set, comprising:
Coherent light generation module, signal light comb generation module, local oscillator light comb generation module, the first electrooptic modulator (i.e. modulation module),
Periodic filter, channel separation module and photoelectric conversion array (i.e. Coherent processing module)；Coherent light generation module difference
Relevant signal light and local oscillator light are transmitted separately to signal light by connection signal light comb generation module and local oscillator light comb generation module
Comb generation module and local oscillator light comb generation module；Signal light comb generation module is divided into FSR between generating comb teethsignalLight comb, signal
Light comb generation module is connected to the light input end of the first electrooptic modulator；RF signal to be processed inputs the first electrooptic modulator
RF input terminal；The output end of first electrooptic modulator and period are FSRlocalPeriodical optical filter, channel spacing be
FSRlocalChannel separation module be sequentially connected；Local oscillator light comb generation module is divided into FSR between generating comb teethlocalLight comb, output
End also connects the input terminal of the channel separation module；The output end of channel separation module connects the photoelectric conversion array；
FSRsignalMinimum frequency, maximum frequency and expectation channel width based on RF signal to be processed generate, FSRlocalBased on wait locate
The minimum frequency and maximum frequency for managing RF signal generate, or the channel width also based on expectation generates.
In one embodiment,
FSRsignal=2f1+2f2+2fBW (1)
FSRlocal=f1+f2+2fBW (2)
Or
FSRlocal=f1+f2 (3)
Each same above-described embodiment of parameter interpretation.
Example IV
Based on above-mentioned apparatus, as shown in Fig. 2, the radio frequency letter present embodiment discloses another kind based on light comb double modulation sideband
Road makeup is set, and distinctive points are: between signal light comb generation module and the first electrooptic modulator, increasing a wavelength and interlock
Filter；Meanwhile the comb teeth interval for the light comb that signal light comb generation module generates is adjusted to FSRsignal/2。
I.e. device includes: that coherent light generation module, signal light comb generation module, local oscillator light comb generation module, wavelength interlock
Filter, electrooptic modulator, periodic filter, channel separation module and photoelectric conversion array.The coherent light generates mould
Block is separately connected signal light comb generation module and local oscillator light comb generation module, and relevant signal light and local oscillator light are transmitted separately to
Signal light comb generation module and local oscillator light comb generation module, the signal light comb generation module are divided into FSR between generating comb teethsignal/
2 light comb is connected to the interleaver.The interleaver connects the light input of the electrooptic modulator
End, RF signal to be processed connect the RF input terminal of the electrooptic modulator, the output end of electrooptic modulator and the periodicity
Optical filter, the channel separation module are sequentially connected, and local oscillator light comb generation module is divided into FSR between generating comb teethlocalLight comb,
Output end also connects the input terminal of the channel separation module, and the output end of channel separation module connects the photoelectric conversion battle array
Column.
Embodiment five
The present embodiment specifically discloses in above-described embodiment, the construction of part of module:
Above-mentioned coherent light generation module includes: sequentially connected laser, the second electrooptic modulator, erbium-doped fiber amplification
Device, fiber coupler, and the first optical filter and the second optical filter that are connect respectively with fiber coupler；Second electric light
The rf inputs mouth of modulator connects microwave signal source, and the direct-flow input end mouth of the second electrooptic modulator connects direct current biasing control
Signal processed.
Above-mentioned signal light comb generation module includes: electro-optic phase modulator, intensity modulator, signal source, electric coupler,
One radio frequency amplifier, phase shifter, the second radio frequency amplifier, bias control circuit；Electro-optic phase modulator and intensity modulator string
Connection；Signal source is separately connected the input terminal of two radio frequency amplifiers after electric coupler；The output end of first radio frequency amplifier connects
Connect the input terminal of phase shifter；The prevention at radio-frequency port of phase shifter connection phase-modulator；The output end connection of second radio frequency amplifier is strong
Spend the prevention at radio-frequency port of modulator；The bias control terminal mouth of bias control circuit bonding strength modulator.
Above-mentioned local oscillator light comb generation module includes: electro-optic phase modulator, intensity modulator, signal source, electric coupler,
Three radio frequency amplifiers, phase shifter, the 4th radio frequency amplifier, bias control circuit；Electro-optic phase modulator and intensity modulator string
Connection；Signal source is separately connected the input terminal of two radio frequency amplifiers after electric coupler；The output end of third radio frequency amplifier connects
Connect the input terminal of phase shifter；The prevention at radio-frequency port of phase shifter connection phase-modulator；The output end connection of 4th radio frequency amplifier is strong
Spend the prevention at radio-frequency port of modulator；The bias control terminal mouth of bias control circuit bonding strength modulator.
It should be noted that in the present invention, for the terms such as " first, second " described in each module, component, only
Convenient for being distinguished to affiliated component, not selected concrete model is distinguished.
Embodiment six
The present embodiment is by taking the RF signal to 11-13GHz carries out channelizing processing according to the bandwidth of 0.5GHz as an example to this hair
Bright method or apparatus is illustrated.
The number of channel is even number, f1=11GHz, f2=13GHz, fBW=0.5GHz.In order to reduce link insertion damage as far as possible
Consumption, channel separation module use wavelength division multiplexer.And the integral multiple of 25GHz is divided between the passband of standard wavelength division multiplexer.According to
When traditional method realizes the channelizing of 11-13GHz signal, if being divided into 25GHz between local oscillator comb teeth, it is divided between signal comb teeth
25GHz ± 0.5GHz, then aliasing can occur for the sideband of 11-13GHz, as shown in Figure 3.Therefore, it can only be combed using the local oscillator of 50GHz
The signal comb teeth of tooth and 50 ± 0.5GHz, due to only using upper side band or lower sideband in the prior art, it is therefore desirable to 4
The local oscillator comb teeth of the signal comb teeth at the interval 50GHz ± 0.5GHz and 4 intervals 50GHz, as shown in Figure 4.
When using scheme proposed by the present invention, calculated first according to formula (1)-(3), FSRsignal=49GHz, FSRlocal
=24GHz or 25GHz.From fig. 5, it can be seen that working as FSRlocalWhen=24GHz, using 2 intervals 49GHz signal light comb and
The local oscillator light comb at 4 intervals 25GHz, which can reach, carries out channelizing processing according to 0.5GHz bandwidth to 11-13GHz signal
Effect.From fig. 6, it can be seen that working as FSRlocalSignal light comb and 4 intervals 25GHz when=25GHz, using 3 intervals 49GHz
Local oscillator comb teeth also may be implemented channelizing processing.Compared with existing scheme, first, local oscillator comb teeth interval be reduced to original one
Half, it can reduce the realization difficulty of local oscillator light comb generation module.The second, the quantity required of signal comb teeth is reduced, is can reduce
The realization difficulty of signal light comb generation module.
In addition, from fig. 6 it can be seen that four passbands of optical filter are able to filter out 11-11.5GHz, 13-
The frequency band of 12.5GHz, 12-12.5GHz and 12-11.5GHz, can be by the broadband signal of 11-13GHz according to 0.5GHz channel
Bandwidth carries out frequency domain separation.This four frequency bands are not in accordance with traditional 11-11.5GHz, 11.5-12GHz, 12-
12.5GHz, 12.5-13GHz are ranked up, and due to the symmetry of lower sideband, the frequency of 11.5-12GHz and 12.5-13GHz
Band is also to be inverted with traditional order, this, which can carry out the processing of tabling look-up of corresponding frequency range in subsequent digital processing link, to turn
It sets.
When channelizing quantity is odd number, turned to carrying out channel according to the bandwidth of 0.5GHz to 11-13.5GHz signal
Example, according to the description in technical solution, channel quantity is odd number, then f1It is still 11GHz, f2For the maximum frequency of RF signal to be processed
Rate subtracts fBW, i.e. f2=13.5GHz-0.5GHz=13GHz, fBW=0.5GHz.Need increased light comb tooth and modulation sideband, such as
Shown in dotted portion in Fig. 5 or Fig. 6, it can be seen that need the signal light comb using 3 intervals 49GHz and 5 at this time
The local oscillator comb teeth at the interval 25GHz.Also it can reach local oscillator comb teeth interval and be reduced to original half, the comb teeth quantity of signal light comb
Reduce by two effects.
From the realization device of Fig. 2, coherent light generation module generates the relevant optical signal of two-way, is used as signal all the way
Light entering signal light comb generation module, another way enter local oscillator light comb generation module as local oscillator light.In order to guarantee signal light comb
Relevant with local oscillator light comb, two light combs are preferably homologous, and a kind of typical mode is using mono-colour laser, Mach-Zehnder intensity
The cascade mode of modulator generates two relevant sidebands, respectively as signal light comb and local oscillator light after optical filter separates
The input of comb.There are many implementations of signal light comb and local oscillator light comb, and typical mode is by phase-modulator and intensity tune
Device processed cascades (document 1 in such as background technique).When not using interleaver, signal light comb generation module generates 3
The signal light comb at the interval root 49GHz, local oscillator light comb generation module generate the local oscillator light comb at 5 intervals 25GHz.It is handed over using wavelength
When wrong filter, local oscillator light comb is constant, and signal light comb generation module generates the signal light comb at 5 intervals 24.5GHz, hands over through wavelength
Odd-numbered channels, the as light comb at the interval 49GHz are filtered out after wrong filter.System can be further decreased in this way to electrooptic modulator
Operating frequency requirements, to reduce cost of implementation.
Using signal light comb as light carrier, through electrooptic modulator loading broad-band radiofrequency signal.Use the period for the light of 25GHz
Filter separates each channel on frequency domain such as FP filter, after the combining of local oscillator light comb, due to the freely frequency of local oscillator light comb
Spectral limit is also 25GHz, then it is poor to be clapped by optics, these carrier wave optical signals to be processed are down-converted to the same frequency band
Interior progress.Again by channel separator, such as wavelength division multiplexer realizes the physical separation of multiple channels.
The invention is not limited to specific embodiments above-mentioned.The present invention, which expands to, any in the present specification to be disclosed
New feature or any new combination, and disclose any new method or process the step of or any new combination.
Claims (9)
1. a kind of radio-frequency channel method based on light comb double modulation sideband characterized by comprising
Relevant signal light and local oscillator light are transmitted separately to signal light comb generation module and local oscillator light comb generation module；
Signal light comb generation module is modulated the signal light received, is divided into FSR between generation comb teethsignalSignal light comb,
It is output to modulation module；
Local oscillator light comb generation module is modulated the local oscillator light received, is divided into FSR between generation comb teethlocalLocal oscillator light comb,
Being output to channel spacing is FSRlocalChannel separation module；
Modulation module is based on the signal light comb, and after being modulated to RF signal to be processed, being output to the period is FSRlocal's
Periodical light filter module is filtered；
The optical signal and the local oscillator light comb that channel separation module is exported based on periodical light filter module, carry out channel division；
Coherent reception processing is carried out to the optical signal after division channel, exports the signal of each subchannel；
Wherein, FSRsignalMinimum frequency, maximum frequency and the channel width of expectation based on RF signal to be processed generate,
FSRlocalMinimum frequency and maximum frequency based on RF signal to be processed generate, or the channel width also based on expectation generates.
2. radio-frequency channel method as described in claim 1, which is characterized in that
FSRsignal=2f1+2f2+2fBW (1)
FSRlocal=f1+f2+2fBW (2)
Or
FSRlocal=f1+f2 (3)
Wherein, fBWFor the channel width of expectation, f1For the minimum frequency of RF signal to be processed, if channel quantity is even number, f2
For the maximum frequency of RF signal to be processed, if channel quantity is odd number, f2Maximum frequency for RF signal to be processed subtracts
fBW。
3. radio-frequency channel method as claimed in claim 2, which is characterized in that signal light comb generation module is arrived in output light tooth
Before modulation module, also the light comb of generation is staggeredly filtered, filters out the light comb output of odd number order.
4. a kind of radio-frequency channel makeup based on light comb double modulation sideband is set characterized by comprising coherent light generation module,
Signal light comb generation module, local oscillator light comb generation module, modulation module, periodic filter, channel separation module and relevant
Processing module；Coherent light generation module is separately connected signal light comb generation module and local oscillator light comb generation module, by relevant letter
Number light and local oscillator light are transmitted separately to signal light comb generation module and local oscillator light comb generation module；Signal light comb generation module generates
FSR is divided between comb teethsignalLight comb, signal light comb generation module is connected to the light input end of modulation module；RF letter to be processed
Number input modulation module RF input terminal；Modulation module be based on the received data of light input end to the received data of RF input terminal into
Row modulation, the output end of modulation module and period are FSRlocalPeriodical optical filter, channel spacing FSRlocalChannel
Separation module is sequentially connected；Local oscillator light comb generation module is divided into FSR between generating comb teethlocalLight comb, output end connection described in
The input terminal of channel separation module；The output end of channel separation module connects the Coherent processing module, Coherent processing module pair
Received data carry out coherent reception processing；FSRsignalMinimum frequency, maximum frequency and expectation based on RF signal to be processed
Channel width generates, FSRlocalMinimum frequency and maximum frequency based on RF signal to be processed generate, or also based on expectation
Channel width generates.
5. radio-frequency channel makeup as claimed in claim 4 is set, which is characterized in that
FSRsignal=2f1+2f2+2fBW (1)
FSRlocal=f1+f2+2fBW (2)
Or
FSRlocal=f1+f2 (3)
Wherein, fBWFor the channel width of expectation, f1For the minimum frequency of RF signal to be processed, if channel quantity is even number, f2
For the maximum frequency of RF signal to be processed, if channel quantity is odd number, f2Maximum frequency for RF signal to be processed subtracts
fBW。
6. radio-frequency channel makeup as described in claim 4 or 5 is set, which is characterized in that it further includes wavelength that radio-frequency channel makeup, which is set,
Interleaver, the interleaver are connected between signal light comb generation module and modulation module, filter out input
Order is light comb and the output of odd number in signal；The signal light comb generation module adjusts the comb teeth interval of generated light comb
For FSRsignalAfter/2, then it is input to the interleaver.
7. the radio-frequency channel makeup as described in one of claim 4-6 is set, which is characterized in that the coherent light generation module packet
It includes: sequentially connected laser, electrooptic modulator, EDFA Erbium-Doped Fiber Amplifier, fiber coupler, and connect respectively with fiber coupler
The first optical filter and the second optical filter connect；The rf inputs mouth of electrooptic modulator connects microwave signal source, electricity
The direct-flow input end mouth connection direct current biasing of optical modulator controls signal.
8. the radio-frequency channel makeup as described in one of claim 4-6 is set, which is characterized in that the signal light comb generation module packet
Include: electro-optic phase modulator, intensity modulator, signal source, electric coupler, the first radio frequency amplifier, phase shifter, the second radio frequency are put
Big device, bias control circuit；Electro-optic phase modulator and intensity modulator series connection；Signal source is separately connected two after electric coupler
The input terminal of a radio frequency amplifier；The input terminal of the output end connection phase shifter of first radio frequency amplifier；Phase shifter connects phase
The prevention at radio-frequency port of modulator；The prevention at radio-frequency port of the output end bonding strength modulator of second radio frequency amplifier；Bias control circuit
The bias control terminal mouth of bonding strength modulator.
9. radio-frequency channel as claimed in claim 8 makeup is set, which is characterized in that the construction of the local oscillator light comb generation module with
Signal light comb generation module is identical, distinctive points be local oscillator light comb generation module signal source output microwave signal frequency with
The difference of signal light comb generation module.
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