CN110233676B - Radio frequency channelization method based on optical comb double modulation sidebands and implementation device - Google Patents
Radio frequency channelization method based on optical comb double modulation sidebands and implementation device Download PDFInfo
- Publication number
- CN110233676B CN110233676B CN201910508861.3A CN201910508861A CN110233676B CN 110233676 B CN110233676 B CN 110233676B CN 201910508861 A CN201910508861 A CN 201910508861A CN 110233676 B CN110233676 B CN 110233676B
- Authority
- CN
- China
- Prior art keywords
- signal
- optical
- comb
- module
- optical comb
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 202
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000001427 coherent effect Effects 0.000 claims abstract description 42
- 238000000926 separation method Methods 0.000 claims abstract description 29
- 238000012545 processing Methods 0.000 claims abstract description 22
- 230000000737 periodic effect Effects 0.000 claims abstract description 16
- 244000126211 Hericium coralloides Species 0.000 claims abstract description 13
- 210000001520 comb Anatomy 0.000 claims description 16
- 238000001914 filtration Methods 0.000 claims description 13
- 239000000835 fiber Substances 0.000 claims description 11
- 238000012216 screening Methods 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 description 7
- 230000010355 oscillation Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Images
Classifications
-
- 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
- H04B10/29—Repeaters
-
- 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
-
- 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
- H04B10/5165—Carrier suppressed; Single sideband; Double sideband or vestigial
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
Disclosure of the inventionA radio frequency channelizing method based on optical comb double modulation sidebands and an implementation device are provided. The method comprises the following steps: generating coherent signal light and local oscillator light, modulating the inter-comb space by a signal light comb generation module to be FSRsignalThe local oscillator optical comb generation module modulates the inter-comb spacing to FSRlocalThe modulation module modulates the RF signal based on the signal optical comb, then the RF signal is filtered by a filter, and coherent receiving processing is carried out after channel division is carried out based on the output signal of the filter and the local oscillator optical comb. The device comprises: the device comprises a coherent light generation module, a signal light comb generation module, a local oscillator light comb generation module, a modulation module, a periodic filter, a channel separation module and a coherent processing module. The invention can reduce the comb tooth interval of the local oscillator optical comb, reduce the requirement on the number of the comb teeth of the signal optical comb, improve the energy utilization rate and reduce the channelization difficulty.
Description
Technical Field
The invention relates to the field of optical communication, in particular to a radio frequency channelization method based on an optical comb double modulation sideband and an implementation device.
Background
Frequency channelization is the division of a frequency band into several sub-band-channels by a set of filters that cover the entire frequency band. CN108650013A discloses an optical frequency shift based channelizing system that does not require an optical comb signal generator, but the number of channels is proportional to the number of optical frequency shift modules, which requires the use of about N/2 optical frequency shift modules for N channels. The optical frequency shift module is realized by the DPMZM, and the cost and the control difficulty of single-sideband carrier suppression are higher. And when the number of channels is large, the system scale is smaller, namely the reusability of the device is stronger. CN102638302B discloses a channelized wideband multi-frequency measurement system based on coherent optical frequency comb, which is used for accurately measuring radio frequency. The comb-shaped comb specifically adopts the beat difference between a signal light frequency comb with comb teeth interval of 39.5GHz and a local oscillator light frequency comb with comb teeth interval of 40GHz, and due to the difference of free spectral ranges of the signal light frequency comb and the local oscillator light frequency comb, radio frequency signals at different frequency points are divided into different channels. The scheme needs a signal optical comb which is equal to a channel to realize the channelization of the radio frequency, and has higher cost and realization difficulty. The scheme disclosed by Broadband radio-frequency channel based on a 39GHz optical frequency comb, IEEE Photonics technologies letters, vol.24, No.8,2012, XiajunXie, Yitang Dai, Yu Ji, etc. is mainly as follows: microwave signals are multicast on an optical comb with comb tooth spacing of 39GHz through carrier suppression double-sideband modulation, and the multicast signals are periodically filtered by using an FP filter with comb tooth spacing of 40 GHz. The first comb tooth of the optical comb and the first filtering passband of the filter have a central frequency difference of 13 GHz. In demultiplexing, the channels are separated using the same channel spacing as the FP filter, i.e., a 40GHz wavelength demultiplexer. These radio frequency carriers, channelized in the optical domain, can be down-converted to an intermediate frequency output using PD direct probing or by coherent probing. It is explicitly mentioned in this document that after the RF signal is multicast on the optical comb, only the red-shifted carrier sideband is used for channelization, and the blue-shifted carrier sideband cannot pass through the FP filter in the scheme, i.e. only one-sided carrier can be used for channelization, and the energy utilization rate is not high.
Disclosure of Invention
The invention aims to: aiming at the existing problems, a radio frequency channelizing method based on an optical comb double modulation sideband and a realization device are provided. The problem that the energy utilization rate is not high due to the fact that only a single sideband is used in the prior art is solved; the comb tooth interval of the local oscillation optical comb is reduced, and the problem that the number of lower flat comb teeth is reduced along with the increase of the comb tooth interval in the optical comb production process is solved.
The technical scheme adopted by the invention is as follows:
the radio frequency channelizing method based on the optical comb double modulation sidebands comprises the following steps:
respectively transmitting coherent signal light and local oscillator light to a signal optical comb generation module and a local oscillator optical comb generation module;
the signal light comb generation module modulates the received signal light to generate the space between comb teeth as FSRsignalThe signal optical comb is output to the modulation module;
the local oscillator optical comb generation module modulates the received signal light, and the space between the generated comb teeth is FSRlocalThe local oscillator optical comb of (1) outputs to the channel with the channel spacing of FSRlocalThe channel separation module of (1);
the modulation module modulates the RF signal to be processed based on the signal optical comb and outputs the modulated RF signal to the modulation module with the cycle of FSRlocalThe periodic light filtering module carries out filtering processing;
the channel separation module is used for carrying out channel division based on the optical signal and the local oscillator optical comb output by the periodic optical filtering module;
coherent receiving processing is carried out on the optical signals after the channels are divided, and signals of all sub-channels are output;
wherein, FSRsignalFSR is generated based on the minimum frequency, maximum frequency and expected channel bandwidth of the RF signal to be processedlocalBased on the minimum and maximum frequencies of the RF signal to be processed, or also based on the expected channel bandwidth.
By the scheme, the upper sideband and the lower sideband of the signal optical comb can be continuously collected by the periodic optical filter, the defect that only the upper sideband or the lower sideband is filtered in the traditional scheme is overcome, invalid sideband energy in the traditional scheme is used, and the energy utilization rate is improved. And, the utilization of the double-sideband carrier wave provides possibility for reducing the number of signal comb teeth and the interval of local oscillator comb teeth.
Further, in the above-mentioned case,
FSRsignal＝2f1+2f2+2fBW (1)
FSRlocal＝f1+f2+2fBW (2)
or
FSRlocal＝f1+f2 (3)
fBWFor the expected channel bandwidth, f1For the minimum frequency of the RF signal to be processed, if the number of channels is even, f2For the maximum frequency of the RF signal to be processed, if the number of channels is odd, f2Subtracting f from the maximum frequency of the RF signal to be processedBW。
The interval of the local oscillator comb teeth used by the invention is about half of the interval of the signal comb teeth, so that the realization cost and the realization difficulty of the local oscillator optical comb can be reduced. Meanwhile, the requirement on the number of comb teeth of the signal optical comb generation module is reduced.
Furthermore, before outputting the optical teeth to the modulation module, the signal optical comb generation module also performs staggered filtering on the generated optical combs to screen out the optical combs with odd number of orders for output.
The proposal can reduce the requirement on the comb tooth interval of the optical comb output by the signal optical comb generation module.
The invention also provides a radio frequency channelizing device based on the optical comb double modulation sideband, which comprises: the device comprises a coherent light generation module, a signal optical comb generation module, a local oscillator optical comb generation module, a modulation module, a periodic filter, a channel separation module and a coherent processing module; the coherent light generation module is respectively connected with the signal optical comb generation module and the local oscillator optical comb generation module and respectively transmits coherent signal light and local oscillator light to the signal optical comb generation module and the local oscillator optical comb generation module; the signal optical comb generating module generates the comb teeth with the spacing of FSRsignalThe signal optical comb generating module is connected to the optical input end of the modulation module; inputting an RF signal to be processed into an RF input end of the modulation module; the modulation module modulates the data received at the RF input based on the data received at the optical input, the output of the modulation module and the period being FSRlocalWith a channel spacing of FSRlocalThe channel separation modules are connected in sequence; the space between the comb teeth generated by the local oscillator optical comb generation module is FSRlocalThe output end of the optical comb is also connected with the input end of the channel separation module; the output end of the channel separation module is connected with the coherent processing module, and the coherent processing module carries out coherent processing on the received data; FSRsignalFSR is generated based on minimum frequency, maximum frequency and expected channel bandwidth of RF signal to be processedlocalBased on the minimum and maximum frequencies of the RF signal to be processed, or also based on the expected channel bandwidth.
The scheme does not increase excessive extra facilities on the basis of the traditional method, only adjusts the frequency or time parameters to achieve the improvement purpose, has simple realization method and can simplify the existing system.
Further, in the above-mentioned case,
FSRsignal＝2f1+2f2+2fBW (1)
FSRlocal＝f1+f2+2fBW (2)
or
FSRlocal＝f1+f2 (3)
fBWFor the expected channel bandwidth, f1For the minimum frequency of the RF signal to be processed, if the number of channels is even, f2For the maximum frequency of the RF signal to be processed, if the number of channels is odd, f2Subtracting f from the maximum frequency of the RF signal to be processedBW。
After the scheme is adopted, the period can be ensured to be FSRlocalThe periodic optical filter continuously collects the upper and lower sidebands of the signal optical comb. Then assisted by the period of FSRlocalThe local oscillator optical comb and the channel interval are equal to FSRlocalThe channel separation module can complete the physical separation of each channel.
Furthermore, the radio frequency channelizing device also comprises a wavelength interleaving filter, wherein the wavelength interleaving filter is connected between the signal optical comb generating module and the modulating module, and is used for screening and outputting odd optical combs in the input signals; the signal optical comb generation module adjusts the comb tooth interval of the generated optical comb to FSRsignalAfter/2, the signal is input to the wavelength interleaving filter.
The proposal can further reduce the requirement on the comb tooth interval of the signal optical comb generation module.
Further, the coherent light generating module includes: the device comprises a laser, an electro-optical modulator, an erbium-doped fiber amplifier, a fiber coupler, a first optical filter and an optical filter, wherein the laser, the electro-optical modulator, the erbium-doped fiber amplifier and the fiber coupler are sequentially connected; the radio frequency input port of the electro-optical modulator is connected with a microwave signal source, and the direct current input port of the electro-optical modulator is connected with a direct current bias control signal.
Further, the signal optical comb generating module comprises: the device comprises an electro-optical phase modulator, an intensity modulator, a signal source, an electric coupler, a first radio frequency amplifier, a phase shifter, a second radio frequency amplifier and a bias control circuit; the electro-optic phase modulator is connected with the intensity modulator in series; the signal source is respectively connected with the input ends of the two radio frequency amplifiers after passing through the electric coupler; the output end of the first radio frequency amplifier is connected with the input end of the phase shifter; the phase shifter is connected with a radio frequency port of the phase modulator; the output end of the second radio frequency amplifier is connected with the radio frequency port of the intensity modulator; the bias control circuit is connected with a bias control port of the intensity modulator.
Furthermore, the structure of the local oscillator optical comb generation module is the same as that of the signal optical comb generation module, and the difference is that the frequency of the microwave signal output by the signal source of the local oscillator optical comb generation module is different from that of the signal optical comb generation module.
The scheme ensures that the device has simple structure, lower cost and convenient installation and maintenance.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. according to the invention, through adjusting the comb tooth interval difference of the signal optical comb and the local oscillator optical comb, the period of the periodic filter and other corresponding parameters are changed, and the traditional RF channelization scheme based on coherent optical comb beat difference can be simplified. In the aspect of hardware implementation, an additional device is not required to be added or changed on the basis of the traditional scheme, the existing system can be simplified, and the modification or installation is simple.
2. The comb teeth flatness is difficult to guarantee as the comb teeth interval output by the optical comb generation module is larger. The interval of the local oscillator comb teeth used by the invention is about half of the interval of the signal comb teeth, the problem that the interval of the local oscillator comb teeth and the signal comb teeth is close in the traditional method is solved, and the realization cost and the realization difficulty of the local oscillator optical comb can be reduced.
3. Because double-sideband modulation is adopted, N-1 signal comb teeth are used at most to support the channelization of N channels, and the traditional method needs N signal comb teeth to realize the channelization of N channels, so the invention can reduce the requirement on the number of the comb teeth of the signal optical comb generation module.
4. Because the double-sideband modulation of the signal optical comb participates in processing such as channelized filtering and the like, the defect that only the upper sideband or the lower sideband is filtered in the traditional scheme is overcome, invalid sideband energy in the traditional scheme is used, and the energy utilization rate is improved.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 and 2 are two different embodiments of the channelizing apparatus of the present invention, respectively.
FIG. 3 is a schematic diagram showing the mixing of the upper and lower sidebands existing when the comb teeth interval of the signal optical comb is 25.5 GHz.
Fig. 4 is a frequency domain diagram of a prior art coherent optical comb-based channelization process.
FIG. 5 is a frequency domain diagram (FSR) of one embodiment of the channelization process proposed by the present inventionlocal＝24GHz、FSRsignal＝49GHz)。
FIG. 6 is a frequency domain diagram (FSR) of another embodiment of the channelization process proposed by the present inventionlocal＝25GHz、FSRsignal＝49GHz)。
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
Example one
The embodiment discloses an improved method for radio frequency channelization, which specifically sets the comb tooth interval of a signal optical comb and a local oscillator optical comb, and specifically comprises the following steps:
FSRsignal＝2f1+2f2+2fBW (1)
FSRlocal＝f1+f2+2fBW (2)
or
FSRlocal＝f1+f2 (3)
Wherein, FSRsignalFor the spacing of the teeth of the signal-optical comb, FSRlocalIs the comb teeth interval of the local oscillation optical comb, fBWFor the expected channel bandwidth, f1For the minimum frequency of the RF signal to be processed, if the number of channels is even, f2For the maximum frequency of the RF signal to be processed, if the number of channels is odd, f2Subtracting f from the maximum frequency of the RF signal to be processedBW。
After the above formula is adopted, the period can be ensured to be FSRlocalThe periodic optical filter continuously collects the upper and lower sidebands of the signal optical comb. Then assisted by the period of FSRlocalThe local oscillator optical comb and the channel interval are equal to FSRlocalThe channel separation module can complete the physical separation of each channel.
Example two
The embodiment discloses a radio frequency channelization method based on an optical comb double modulation sideband, which comprises the following steps:
respectively transmitting coherent signal light and local oscillator light to a signal optical comb generation module and a local oscillator optical comb generation module;
the signal light comb generation module modulates the received signal light to generate the space between comb teeth as FSRsignalThe optical comb is output to the modulation module;
the local oscillator light comb generation module modulates the received local oscillator light, and the space between the generated comb teeth is FSRlocalOutput to the channel with a spacing of FSRlocalThe channel separation module of (1);
the modulation module modulates the RF signal to be processed based on the optical signal sent by the signal optical comb generation module and outputs the modulated RF signal to the modulation module with the cycle of FSRlocalThe periodic light filtering module carries out filtering processing;
the channel separation module is used for carrying out channel division on the basis of the optical signals output by the periodic optical filtering module and the optical signals output by the local oscillator optical comb generation module;
coherent processing (such as photoelectric conversion) is carried out on the optical signals after the channels are divided, and signals of each sub-channel are output;
wherein, FSRsignalFSR is generated based on the minimum frequency, maximum frequency and expected channel bandwidth of the RF signal to be processedlocalBased on the minimum and maximum frequencies of the RF signal to be processed, or also based on the expected channel bandwidth.
In one embodiment, FSRsignalAnd FSRlocalThe calculation method of (2) is an improved method in the first embodiment.
In another embodiment, the signal optical comb generating module further performs interleaved filtering on the generated optical comb before outputting the optical teeth to the modulating module, that is, the comb tooth interval of the signal optical comb is changed into FSRsignalAnd/2, and screen out the optical comb outputs in odd order (No. 1, 3, 5 … … optical combs).
EXAMPLE III
Referring to fig. 1, the present embodiment discloses an optical comb double modulation sideband-based radio frequency channelization device, including: the system comprises a coherent light generation module, a signal light comb generation module, a local oscillator light comb generation module, a first electro-optical modulator (namely a modulation module), a periodic filter, a channel separation module and a photoelectric conversion array (namely a coherent processing module); the coherent light generation module is respectively connected with the signal optical comb generation module and the local oscillator optical comb generation module and respectively transmits coherent signal light and local oscillator light to the signal optical comb generation module and the local oscillator optical comb generation module; the signal optical comb generating module generates the comb teeth with the spacing of FSRsignalThe signal optical comb generating module is connected to the optical input end of the first electro-optical modulator; inputting an RF signal to be processed into an RF input end of the first electro-optical modulator; the output end of the first electro-optical modulator has FSR periodlocalWith a channel spacing of FSRlocalThe channel separation modules are connected in sequence; the space between the comb teeth generated by the local oscillator optical comb generation module is FSRlocalThe output end of the optical comb is also connected with the input end of the channel separation module; of channel separation modulesThe output end is connected with the photoelectric conversion array; FSRsignalFSR is generated based on minimum frequency, maximum frequency and expected channel bandwidth of RF signal to be processedlocalBased on the minimum and maximum frequencies of the RF signal to be processed, or also based on the expected channel bandwidth.
In one embodiment of the present invention,
FSRsignal＝2f1+2f2+2fBW (1)
FSRlocal＝f1+f2+2fBW (2)
or
FSRlocal＝f1+f2 (3)
The respective parameters are explained as in the above-described embodiment.
Example four
Based on the above device, as shown in fig. 2, this embodiment discloses another radio frequency channelizing device based on an optical comb double modulation sideband, which is characterized in that: a wavelength interleaving filter is added between the signal optical comb generation module and the first electro-optical modulator; meanwhile, the comb teeth interval of the optical comb generated by the signal optical comb generation module is adjusted to FSRsignal/2。
Namely, the apparatus comprises: the device comprises a coherent light generation module, a signal light comb generation module, a local oscillator light comb generation module, a wavelength interleaving filter, an electro-optical modulator, a periodic filter, a channel separation module and a photoelectric conversion array. The coherent light generation module is respectively connected with the signal light comb generation module and the local oscillator light comb generation module, and transmits coherent signal light and local oscillator light to the signal light comb generation module and the local oscillator light comb generation module respectively, and the signal light comb generation module generates comb teeth with the spacing of FSRsignalAn optical comb of/2 connected to the interleaver. The wavelength interleaving filter is connected with the optical input end of the electro-optical modulator, the RF signal to be processed is connected with the RF input end of the electro-optical modulator, the output end of the electro-optical modulator is connected with the periodic optical filter, the channel separation modules are sequentially connected, and the comb teeth generated by the local oscillator optical comb generation module have the spacing of FSR (frequency selective response)localOptical comb ofThe end of the photoelectric conversion module is also connected with the input end of the channel separation module, and the output end of the photoelectric conversion module is connected with the photoelectric conversion array.
EXAMPLE five
The present embodiment specifically discloses the structure of a part of modules in the above embodiments:
the coherent light generation module includes: the laser, the second electro-optical modulator, the erbium-doped fiber amplifier, the fiber coupler, the first optical filter and the second optical filter are connected with the fiber coupler in sequence; the radio frequency input port of the second electro-optical modulator is connected with a microwave signal source, and the direct current input port of the second electro-optical modulator is connected with a direct current bias control signal.
The signal optical comb generating module includes: the device comprises an electro-optical phase modulator, an intensity modulator, a signal source, an electric coupler, a first radio frequency amplifier, a phase shifter, a second radio frequency amplifier and a bias control circuit; the electro-optic phase modulator is connected with the intensity modulator in series; the signal source is respectively connected with the input ends of the two radio frequency amplifiers after passing through the electric coupler; the output end of the first radio frequency amplifier is connected with the input end of the phase shifter; the phase shifter is connected with a radio frequency port of the phase modulator; the output end of the second radio frequency amplifier is connected with the radio frequency port of the intensity modulator; the bias control circuit is connected with a bias control port of the intensity modulator.
The local oscillator optical comb generating module includes: the device comprises an electro-optical phase modulator, an intensity modulator, a signal source, an electric coupler, a third radio frequency amplifier, a phase shifter, a fourth radio frequency amplifier and a bias control circuit; the electro-optic phase modulator is connected with the intensity modulator in series; the signal source is respectively connected with the input ends of the two radio frequency amplifiers after passing through the electric coupler; the output end of the third radio frequency amplifier is connected with the input end of the phase shifter; the phase shifter is connected with a radio frequency port of the phase modulator; the output end of the fourth radio frequency amplifier is connected with the radio frequency port of the intensity modulator; the bias control circuit is connected with a bias control port of the intensity modulator.
In the present invention, terms such as "first" and "second" described for each module and component are only used for convenience of distinguishing the corresponding component, and do not distinguish the selected specific model.
EXAMPLE six
This embodiment describes the method or apparatus of the present invention by taking as an example the channelization process of an RF signal of 11-13GHz in a bandwidth of 0.5 GHz.
Number of channels being even, f1＝11GHz、f2＝13GHz、fBW0.5 GHz. In order to reduce the link insertion loss as much as possible, the channel separation module uses a wavelength division multiplexer. While the passband spacing of a standard wavelength division multiplexer is an integer multiple of 25 GHz. When the 11-13GHz signal is channelized according to the conventional method, if the local oscillator comb teeth spacing is 25GHz, the signal comb teeth spacing is 25GHz +/-0.5 GHz, and the 11-13GHz sideband can be aliased, as shown in FIG. 3. Therefore, only 50GHz local oscillator comb teeth and 50 +/-0.5 GHz signal comb teeth can be adopted, and 4 signal comb teeth at intervals of 50GHz +/-0.5 GHz and 4 local oscillator comb teeth at intervals of 50GHz are needed because only the upper sideband or the lower sideband is used in the prior art, as shown in FIG. 4.
When using the solution proposed by the present invention, FSR is first calculated according to equations (1) - (3)signal＝49GHz， FSRlocal24GHz or 25 GHz. As can be seen from FIG. 5, when FSR is usedlocalWhen the frequency band is 24GHz, 2 signal optical combs with 49GHz intervals and 4 local oscillator optical combs with 25GHz intervals are used, so that the effect of carrying out channelization processing on 11-13GHz signals according to the 0.5GHz bandwidth can be achieved. As can be seen from FIG. 6, when FSR is usedlocalWhen the frequency is 25GHz, 3 signal optical combs with 49GHz intervals and 4 local oscillator comb teeth with 25GHz intervals are used to realize the channelization processing. Compared with the prior art, the interval between the first local oscillator comb teeth and the second local oscillator comb teeth is reduced to half of the original interval, and the realization difficulty of the local oscillator optical comb generation module can be reduced. Secondly, the number of the signal comb teeth is reduced, and the realization difficulty of the signal optical comb generation module can be reduced.
In addition, as can be seen from fig. 6, the four passbands of the optical filter can respectively filter out the frequency bands of 11-11.5GHz, 13-12.5GHz, 12-12.5GHz and 12-11.5GHz, i.e. the broadband signal of 11-13GHz can be separated in frequency domain according to the channel bandwidth of 0.5 GHz. The four frequency bands are not sorted according to 11-11.5GHz, 11.5-12GHz, 12-12.5GHz and 12.5-13GHz in the traditional sense, and due to the symmetry of the upper and lower sidebands, the frequency bands of 11.5-12GHz and 12.5-13GHz are also inverted from the traditional sequence, so that the frequency bands can be transposed after corresponding frequency band table look-up processing is carried out in a subsequent digital processing link.
When the channelization number is odd, taking the case of performing channelization on an 11-13.5GHz signal according to a bandwidth of 0.5GHz as an example, according to the description in the technical solution, if the number of channels is odd, then f1Is still 11GHz, f2Subtracting f from the maximum frequency of the RF signal to be processedBWI.e. f2＝13.5GHz-0.5GHz＝13GHz、 fBW0.5 GHz. The optical comb teeth and modulation sidebands that need to be added are shown in dashed lines in fig. 5 or fig. 6, and it can be seen that 3 signal optical combs at 49GHz intervals and 5 local oscillator comb teeth at 25GHz intervals need to be used. The effect that the interval of the local oscillation comb teeth is reduced to half of the original interval and the number of the signal optical comb teeth is reduced by two can be achieved.
From the implementation apparatus shown in fig. 2, the coherent light generation module generates two coherent optical signals, one of which enters the signal optical comb generation module as signal light, and the other of which enters the local oscillation optical comb generation module as local oscillation light. In order to ensure coherence of the signal optical comb and the local oscillator optical comb, the two optical combs are preferably homologous, and a typical mode is to generate two coherent sidebands by cascading a monochromatic laser and a mach-zehnder intensity modulator, and the two coherent sidebands are separated by an optical filter and then are respectively used as input of the signal optical comb and the local oscillator optical comb. There are various implementations of the signal optical comb and the local oscillator optical comb, and a typical implementation is to cascade a phase modulator and an intensity modulator (as in document 1 in the background art). When the wavelength interleaving filter is not used, the signal optical comb generating module generates 3 signal optical combs with 49GHz intervals, and the local oscillator optical comb generating module generates 5 local oscillator optical combs with 25GHz intervals. When the wavelength interleaving filter is used, the local oscillator optical comb is unchanged, the signal optical comb generating module generates 5 signal optical combs with 24.5GHz intervals, and odd channels are filtered out after the signal optical combs pass through the wavelength interleaving filter, namely the optical combs with 49GHz intervals. Therefore, the requirement of the system on the working frequency of the electro-optical modulator can be further reduced, and the implementation cost is reduced.
The signal optical comb is used as an optical carrier, and a broadband radio frequency signal is loaded through an electro-optical modulator. By adopting an optical filter with a period of 25GHz, such as an FP filter, each channel is separated in a frequency domain and combined with a local oscillator optical comb, and since the free frequency spectrum range of the local oscillator optical comb is also 25GHz, the carrier optical signals to be processed can be down-converted to the same frequency band through optical beat. And then the physical separation of a plurality of channels is realized by a channel separation device, such as a wavelength division multiplexer.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (7)
1. A radio frequency channelizing method based on an optical comb double modulation sideband is characterized by comprising the following steps:
respectively transmitting coherent signal light and local oscillator light to a signal optical comb generation module and a local oscillator optical comb generation module;
the signal light comb generation module modulates the received signal light to generate the space between comb teeth as FSRsignalThe signal optical comb is output to the modulation module;
the local oscillator light comb generation module modulates the received local oscillator light, and the space between the generated comb teeth is FSRlocalThe local oscillator optical comb of (1) outputs to the channel with the channel spacing of FSRlocalThe channel separation module of (1);
the modulation module modulates the RF signal to be processed based on the signal optical comb and outputs the modulated RF signal to the modulation module with the cycle of FSRlocalThe periodic light filtering module carries out filtering processing;
the channel separation module is used for carrying out channel division on the basis of the optical signal output by the periodic optical filtering module and the local oscillator optical comb;
coherent receiving processing is carried out on the optical signals after the channels are divided, and signals of all sub-channels are output;
wherein,
FSRsignal＝2f1+2f2+2fBW
(1)
FSRlocal＝f1+f2+2fBW (2)
or
FSRlocal＝f1+f2 (3)
Wherein f isBWFor the expected channel bandwidth, f1For the minimum frequency of the RF signal to be processed, if the number of channels is even, f2For the maximum frequency of the RF signal to be processed, if the number of channels is odd, f2Subtracting f from the maximum frequency of the RF signal to be processedBW。
2. The radio frequency channelization method of claim 1, wherein the signal optical comb generation module further interleaves the generated optical combs to screen out odd-ordered optical comb outputs before outputting the optical teeth to the modulation module.
3. An optical comb double modulation sideband-based radio frequency channelizing device, comprising: the device comprises a coherent light generation module, a signal optical comb generation module, a local oscillator optical comb generation module, a modulation module, a periodic filter, a channel separation module and a coherent processing module; the coherent light generation module is respectively connected with the signal optical comb generation module and the local oscillator optical comb generation module and respectively transmits coherent signal light and local oscillator light to the signal optical comb generation module and the local oscillator optical comb generation module; the signal optical comb generating module generates the comb teeth with the spacing of FSRsignalThe signal optical comb generating module is connected to the optical input end of the modulation module; inputting an RF signal to be processed into an RF input end of the modulation module; the modulation module modulates the data received at the RF input based on the data received at the optical input, the output of the modulation module and the period being FSRlocalWith a channel spacing of FSRlocalThe channel separation modules are connected in sequence; the space between the comb teeth generated by the local oscillator optical comb generation module is FSRlocalThe output end of the optical comb is connected with the input end of the channel separation module; of channel separation modulesThe output end is connected with the coherent processing module, and the coherent processing module performs coherent receiving processing on the received data;
FSRsignal＝2f1+2f2+2fBW
(1)
FSRlocal＝f1+f2+2fBW (2)
or
FSRlocal＝f1+f2 (3)
Wherein f isBWFor the expected channel bandwidth, f1For the minimum frequency of the RF signal to be processed, if the number of channels is even, f2For the maximum frequency of the RF signal to be processed, if the number of channels is odd, f2Subtracting f from the maximum frequency of the RF signal to be processedBW。
4. The radio frequency channelized device according to claim 3, wherein the radio frequency channelized device further comprises a wavelength interleaving filter, said wavelength interleaving filter is connected between the signal optical comb generating module and the modulating module, and is used for screening out and outputting the optical combs with odd number order in the input signal; the signal optical comb generation module adjusts the comb tooth interval of the generated optical comb to FSRsignalAfter/2, the signal is input to the wavelength interleaving filter.
5. The radio frequency channelized apparatus of claim 3 or 4 wherein the coherent light generation module comprises: the device comprises a laser, an electro-optical modulator, an erbium-doped fiber amplifier, a fiber coupler, a first optical filter and a second optical filter, wherein the laser, the electro-optical modulator, the erbium-doped fiber amplifier and the fiber coupler are sequentially connected; the radio frequency input port of the electro-optical modulator is connected with a microwave signal source, and the direct current input port of the electro-optical modulator is connected with a direct current bias control signal.
6. The radio frequency channelized device of claim 3 or 4 wherein the signal optical comb generating module includes: the device comprises an electro-optical phase modulator, an intensity modulator, a signal source, an electric coupler, a first radio frequency amplifier, a phase shifter, a second radio frequency amplifier and a bias control circuit; the electro-optic phase modulator is connected with the intensity modulator in series; the signal source is respectively connected with the input ends of the two radio frequency amplifiers after passing through the electric coupler; the output end of the first radio frequency amplifier is connected with the input end of the phase shifter; the phase shifter is connected with a radio frequency port of the phase modulator; the output end of the second radio frequency amplifier is connected with the radio frequency port of the intensity modulator; the bias control circuit is connected with a bias control port of the intensity modulator.
7. The radio frequency channelizing device according to claim 6, wherein the local oscillator optical comb generating module is identical in structure to the signal optical comb generating module, and is different from the signal optical comb generating module in frequency of the microwave signal output by the signal source of the local oscillator optical comb generating module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910508861.3A CN110233676B (en) | 2019-06-13 | 2019-06-13 | Radio frequency channelization method based on optical comb double modulation sidebands and implementation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910508861.3A CN110233676B (en) | 2019-06-13 | 2019-06-13 | Radio frequency channelization method based on optical comb double modulation sidebands and implementation device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110233676A CN110233676A (en) | 2019-09-13 |
| CN110233676B true CN110233676B (en) | 2021-11-23 |
Family
ID=67859765
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910508861.3A Active CN110233676B (en) | 2019-06-13 | 2019-06-13 | Radio frequency channelization method based on optical comb double modulation sidebands and implementation device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110233676B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111294115B (en) * | 2020-03-03 | 2023-03-31 | 西南交通大学 | Anti-interception and anti-interference radio frequency communication method based on double optical frequency combs |
| CN111756451B (en) * | 2020-06-08 | 2021-10-01 | 西安空间无线电技术研究所 | Four-channel indium phosphide optical I/Q zero intermediate frequency channelized receiving chip |
| CN111812909B (en) * | 2020-07-19 | 2023-06-23 | 武汉法涞智能科技有限公司 | Device for producing homologous double-light comb |
| CN112165361A (en) * | 2020-09-29 | 2021-01-01 | 中国船舶重工集团公司第七二四研究所 | Optical channelization device and method with tunable frequency range |
| CN112422179B (en) * | 2020-10-22 | 2022-02-01 | 西安空间无线电技术研究所 | Reconfigurable optical channel flexible extraction system and method based on comb switching |
| CN112929087B (en) * | 2021-01-28 | 2022-04-22 | 中国科学院半导体研究所 | Image frequency suppression mixing transmission method and device |
| CN113132015B (en) * | 2021-03-16 | 2022-05-17 | 中国电子科技集团公司第二十九研究所 | Optical radio frequency channelization realization method for even number of radio frequency channels |
| CN113203552B (en) * | 2021-04-07 | 2022-12-27 | 南华大学 | Quick vector measurement device and measurement method based on double-optical-frequency comb |
| CN113315582B (en) * | 2021-05-24 | 2022-09-23 | 中国人民解放军国防科技大学 | Microwave photon double-optical-frequency comb OFDM (orthogonal frequency division multiplexing) transmitting device and transmitting method |
| CN114978335B (en) * | 2022-05-16 | 2023-08-11 | 烽火通信科技股份有限公司 | Wavelength division multiplexing system and method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2478746A (en) * | 2010-03-16 | 2011-09-21 | Univ Dublin City | Radio over fibre system with direct modulation of a DC biased laser by a data modulated RF signal, preferably producing an optical comb signal |
| CN107222263A (en) * | 2017-04-27 | 2017-09-29 | 南京航空航天大学 | A kind of microwave photon transceiver based on relevant frequency comb |
| CN108650013A (en) * | 2018-04-19 | 2018-10-12 | 西安空间无线电技术研究所 | A kind of system and method for the broad-band multipath channelizing based on optical frequency shift |
| CN109556593A (en) * | 2018-10-09 | 2019-04-02 | 清华大学深圳研究生院 | A kind of angular velocity measurement device, method and its carrier |
-
2019
- 2019-06-13 CN CN201910508861.3A patent/CN110233676B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2478746A (en) * | 2010-03-16 | 2011-09-21 | Univ Dublin City | Radio over fibre system with direct modulation of a DC biased laser by a data modulated RF signal, preferably producing an optical comb signal |
| CN107222263A (en) * | 2017-04-27 | 2017-09-29 | 南京航空航天大学 | A kind of microwave photon transceiver based on relevant frequency comb |
| CN108650013A (en) * | 2018-04-19 | 2018-10-12 | 西安空间无线电技术研究所 | A kind of system and method for the broad-band multipath channelizing based on optical frequency shift |
| CN109556593A (en) * | 2018-10-09 | 2019-04-02 | 清华大学深圳研究生院 | A kind of angular velocity measurement device, method and its carrier |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110233676A (en) | 2019-09-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110233676B (en) | Radio frequency channelization method based on optical comb double modulation sidebands and implementation device | |
| CN110247711B (en) | Signal modulation method and execution device, channelization method and processing system | |
| JP6123337B2 (en) | Optical signal processing device, transmission device, and optical signal processing method | |
| US8693895B2 (en) | Signal transmission and reception device and method | |
| CN108964779B (en) | Channelized receiving method and device based on the vibration of frequency spectrum intertexture trimmed book | |
| CN108650013A (en) | A kind of system and method for the broad-band multipath channelizing based on optical frequency shift | |
| CN112165361A (en) | Optical channelization device and method with tunable frequency range | |
| CN112039596A (en) | Broadband tunable multi-band microwave up-conversion system | |
| CN114079505A (en) | Power detection circuit, system, method and chip of optical signal | |
| Brès et al. | Performance of instantaneous microwave analysis by parametric channelized receiver through time domain monitoring | |
| CN111596278A (en) | Multi-band coherent frequency-sweeping radar system based on dual-drive Mach-Zehnder modulator | |
| CN215956390U (en) | Microwave photon single optical frequency comb injection locking channelized receiving device | |
| CN114024616B (en) | Multi-path variable frequency structure realized by polarization state independent modulation | |
| CN113612543B (en) | Channelized receiving device and method for injection locking of microwave photon single-optical-frequency comb | |
| CN113359369B (en) | High-frequency anti-aliasing band-pass adjustable light analog-to-digital conversion device | |
| JP6468629B2 (en) | WDM coherent transmission system | |
| CN114024620B (en) | Double-optical-frequency comb channelized receiver | |
| CN112422179A (en) | Reconfigurable optical channel flexible extraction system and method based on comb switching | |
| JP5385858B2 (en) | Generation method and apparatus for optical orthogonal frequency division multiplexing optical signal | |
| CN115765882B (en) | Microwave photon channelized receiving device and method based on cascade connection of acousto-optic frequency shifters | |
| CN112838898B (en) | Frequency locking device and frequency locking method | |
| CN113132015B (en) | Optical radio frequency channelization realization method for even number of radio frequency channels | |
| CN115276785B (en) | Spectrum processing device, spectrum processing method and related equipment | |
| CN216057023U (en) | Four-channel multiple frequency tunable millimeter wave generator based on acousto-optic filter | |
| JP3923771B2 (en) | Multi-wavelength light source |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |