CN111948837B - Microwave photon filtering method and microwave photon filtering device - Google Patents
Microwave photon filtering method and microwave photon filtering device Download PDFInfo
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- CN111948837B CN111948837B CN202010856221.4A CN202010856221A CN111948837B CN 111948837 B CN111948837 B CN 111948837B CN 202010856221 A CN202010856221 A CN 202010856221A CN 111948837 B CN111948837 B CN 111948837B
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Abstract
The invention discloses a microwave photon filtering methodThe method comprises the steps of performing phase modulation on an optical carrier by using a microwave signal with the frequency f to generate a modulated optical signal of an n-order optical sideband, wherein n is an integer greater than or equal to 2; filtering the modulated optical signal with an optical bandpass filter having a passband width BW with a center frequency different from the optical carrier by Δ f, wherein,
fBW、fcrespectively filtering the bandwidth and the central frequency of a passband by the microwave photon filtering method; and performing photoelectric conversion on the filtered modulated optical signal to obtain 2n-1 order harmonic component of the microwave signal. The invention also discloses a microwave photon filtering device. The invention can realize the microwave photon filtering of the nonlinear odd-order higher harmonic wave by utilizing the nonlinearity of the phase modulator, and can improve the central frequency of the microwave photon filter to the W wave band or even a higher frequency band.
Description
Technical Field
The present invention relates to a microwave photon filtering method, and more particularly, to a microwave photon filtering method and a microwave photon filtering apparatus.
Background
The filter is the basis of a signal processing system, almost exists in each signal processing system, and has important application value in the fields of radar, wireless communication, mobile communication and the like. The filter can be regarded as a frequency-selective circuit, whose basic purpose is to gate or eliminate a certain part of the frequency in the spectrum of the input signal, where the frequency range through which the signal can pass is called the pass band and the frequency range in which the signal is greatly attenuated and suppressed is called the stop band. The traditional electric filter has great limitations in the aspects of multi-channel filtering frequency tuning, bandwidth change and the like, so that the application of the traditional electric filter in the high-frequency field is greatly limited. Furthermore, with the rapid increase in communication capacity in microwave systems, the requirements for the rate and bandwidth of signal processing become higher and higher, so that the performance of conventional electrical filters faces a great challenge.
With the development of microwave photon technology, microwave photon filters have come into play. The microwave photon filter is a photon system which is specially designed to filter microwave signals. Compared with the traditional electric domain microwave filter, the microwave photon filter can process microwave signals in an optical domain, suppress noise, filter clutter signals and acquire microwave signals of a required frequency band, so that the function of frequency selection of signals is realized. The microwave photon filter can more easily realize reconstruction of large bandwidth, tunable and passband spectrum shape in a high frequency band by utilizing the advantages of small optical fiber loss, strong anti-electromagnetic interference capability, small volume, light weight, large bandwidth and the like and because the loss of the optical fiber to modulated radio frequency signals with different frequencies is flat. Therefore, microwave photonic filters are an important research direction in the field of future signal processing technology.
The filtering method based on the microwave photon technology mainly comprises a method of combining the spectrum division of a broadband light source with a dispersion device, a method of combining phase modulation with fiber bragg grating and the like. A broadband light source based on spectrum division and a tunable all-optical single-band-pass photonic microwave filter based on phase modulation utilize the broadband light source and a Mach-Zehnder Interferometer (MZI) to generate continuous spectrum samples, the samples form a finite impulse response filter with single band-pass response with the help of a single-mode fiber, and then a phase modulator is adopted to eliminate baseband components in filter response. The center frequency of the microwave photonic filter [ Chen M, "Tunable all-optical single-base photonic filter based on spectral narrow optical source and phase modulation", Applied Optics,2013,52(2):302-306 ] can be adjusted by modifying the free spectral range of the MZI. A wide-tuning single-passband microwave photonic filter based on a chirped Phase-shifted fiber Bragg grating (PS-FBG) is disclosed, wherein a light wave is subjected to Phase modulation in a Phase modulator by a frequency-sweeping microwave signal generated by a vector network analyzer. Because the reflection spectrum of the chirped PS-FBG has a narrow notch window, if an optical carrier is positioned at the passband of the reflection spectrum, when one modulation sideband falls at the notch position, only the other corresponding sideband is left at the moment, the amplitude balance of the upper sideband and the lower sideband is broken, the conversion from phase to intensity is realized, and a single-passband frequency response (Wang chess), a wide-tuning single-passband microwave photon filter based on the chirped phase-shift FBG (fiber Bragg Grating), photoelectron and laser 2015,26(07):1248 and 1254) is generated after the detection of a Photoelectric Detector (PD). However, although the microwave photonic filters provided by the above methods can achieve wide band tuning, they can achieve only linear filtering.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art and provide a microwave photon filtering method, which can realize the nonlinear odd-order high-order harmonic microwave photon filtering by utilizing the nonlinearity of a phase modulator and can improve the central frequency of a microwave photon filter to a W wave band or even a higher frequency band.
The invention specifically adopts the following technical scheme to solve the technical problems:
a microwave photon filtering method, using microwave signal with frequency f to modulate phase of optical carrier, generating modulated optical signal of n-order optical sideband, n is integer larger than or equal to 2; filtering the modulated optical signal with an optical bandpass filter having a passband width BW with a center frequency different from the optical carrier by Δ f, wherein,
fBW、fcbandwidth and sum of filter pass bands of the microwave photon filtering methodA heart frequency; and performing photoelectric conversion on the filtered modulated optical signal to obtain 2n-1 order harmonic component of the microwave signal.
Preferably, at least one of the following three parameters is adjustable: the optical carrier frequency, the passband center frequency of the optical bandpass filter, and the passband width of the optical bandpass filter.
Based on the same inventive concept, the following technical scheme can be obtained:
a microwave photonic filtering device, comprising:
the light source module is used for generating optical carriers;
the phase modulation module is used for carrying out phase modulation on an optical carrier by using a microwave signal with the frequency of f to generate a modulated optical signal of an n-order optical sideband, wherein n is an integer greater than or equal to 2;
an optical bandpass filter for filtering the modulated optical signal, wherein the frequency difference Δ f between the center frequency and the optical carrier and the passband width BW satisfy
Wherein f isBW、fcThe bandwidth and the center frequency of the filter passband of the microwave photon filter device are respectively.
And the photoelectric detector is used for performing photoelectric conversion on the filtered modulated optical signal to obtain 2n-1 order harmonic component of the microwave signal.
Preferably, at least one of the following three parameters is adjustable: the optical carrier frequency, the passband center frequency of the optical bandpass filter, and the passband width of the optical bandpass filter.
Preferably, the optical bandpass filter is a programmable optical filter.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
the invention fully utilizes the nonlinearity of the phase modulator, can filter out odd-order high-order harmonic waves of the applied microwave signals, can realize the filtering of W-band signals under the condition of not using a W-band electric filter, and can even expand to a higher frequency band; and further reconfigurability of the microwave photonic filter may be achieved through the use of wavelength tunable lasers and/or programmable optical filters.
Drawings
FIG. 1 is a schematic structural diagram of a preferred embodiment of a microwave photonic filtering apparatus of the present invention;
FIG. 2, FIG. 3, and FIG. 4 are respectively the conditions of the optical sideband in the passband of the optical filter when the frequency of the microwave signal is gradually increased;
FIG. 5 is a filter response of a microwave photonic filter for the third harmonic obtained using Opti system software simulation.
Detailed Description
Aiming at the defects of the prior art, the invention combines phase modulation and optical filtering to filter out odd high-order harmonics of the applied microwave signals, can realize the filtering of W-band signals without using a W-band electric filter, and can even be expanded to a higher frequency band; and further reconfigurability of the microwave photonic filter may be achieved through the use of wavelength tunable lasers and/or programmable optical filters.
Specifically, the microwave photon filtering method of the invention uses a microwave signal with the frequency f to perform phase modulation on an optical carrier to generate a modulated optical signal of an n-order optical sideband, wherein n is an integer greater than or equal to 2; filtering the modulated optical signal with an optical bandpass filter having a passband width BW with a center frequency different from the optical carrier by Δ f, wherein,
fBW、fcrespectively filtering the bandwidth and the central frequency of a passband by the microwave photon filtering method; and performing photoelectric conversion on the filtered modulated optical signal to obtain 2n-1 order harmonic component of the microwave signal.
The invention relates to a microwave photon filtering device, which comprises:
the light source module is used for generating optical carriers;
the phase modulation module is used for carrying out phase modulation on an optical carrier by using a microwave signal with the frequency of f to generate a modulated optical signal of an n-order optical sideband, wherein n is an integer greater than or equal to 2;
an optical bandpass filter for filtering the modulated optical signal, wherein the frequency difference Δ f between the center frequency and the optical carrier and the passband width BW satisfy
Wherein f isBW、fcThe bandwidth and the center frequency of the filter passband of the microwave photon filter device are respectively.
And the photoelectric detector is used for performing photoelectric conversion on the filtered modulated optical signal to obtain 2n-1 order harmonic component of the microwave signal.
Microwave signals are loaded to the radio frequency input end of the phase modulation module, and the center frequency and bandwidth of the optical bandpass filter are set appropriately, and optical carriers, plus or minus 1 order and plus or minus n order sidebands (n is 2,3,4, … …) are considered. Supposing that the central frequency of the optical band-pass filter is less than the frequency corresponding to the wavelength of the optical carrier, when the frequency of the microwave signal is lower, the carrier and each order sideband are in the passband of the optical band-pass filter, as the phases of the +/-1 order sidebands are opposite and are respectively offset after beat frequency of the carrier, fundamental wave components do not exist, the +1 order sideband and the-1 order sideband, the +3 order sideband and the-1 order sideband, and the +/-2 order sideband and the optical carrier are offset after beat frequency, so that second harmonic components do not exist, the +2 order sideband and the-1 order sideband, the +1 order sideband and the-2 order sideband, and the +/-3 order sideband and the optical carrier are offset after beat frequency, third harmonic components do not exist, and so on, no microwave signal is beat; when the microwave signal frequency is satisfied to enable an optical carrier, an-nth order sideband and a plus (n-1) th order sideband to be in a pass band of an optical bandpass filter, and a + nth order sideband to be out of the pass band of the optical bandpass filter, the-nth order sideband and the plus (n-1) th order sideband can beat to generate a 2n-1 th order harmonic microwave signal; when the microwave frequency is satisfied, the-n order sideband is also outside the passband, only the optical carrier and the plus or minus (n-1) order sideband are contained in the passband, and the plus or minus (n-1) order sideband is respectively offset after the carrier beat frequency. Thus, a 2n-1 order harmonic microwave signal is available at a frequency determined by the current bandwidth of the optical bandpass filter. The principle is similar when the optical bandpass filter center frequency is greater than the optical carrier wavelength counterpart.
Assuming that the center frequency of the optical bandpass filter is in phase with the frequency of the optical carrierWhen the difference delta f and the passband width are BW, the initial frequency of the microwave photon filter device can be obtained
Frequency of termination
The center frequency of the microwave photon filtering device of the invention
A bandwidth of
In order to make the center frequency, the bandwidth and the reconfigurability of the microwave photonic filter device of the present invention tunable, at least one of the following three parameters is preferably adjustable: the optical carrier frequency, the passband center frequency of the optical bandpass filter, and the passband width of the optical bandpass filter.
The optical bandpass filter can be realized by the existing or future modes of an optical fiber Bragg grating, a wavelength division multiplexer and the like, and the programmable optical filter can flexibly set the center frequency and the passband width, so the programmable optical filter is preferentially selected as the optical bandpass filter.
For the public understanding, the technical scheme of the invention is explained in detail by a specific embodiment and the accompanying drawings:
as shown in fig. 1, the present embodiment is a microwave photonic Filter OF third harmonic, which includes a light source module, a Phase Modulator (PM), a tunable Optical Filter (OF), and a Photodetector (PD). The light source module is used for generating optical carriers; the phase modulator is used for modulating the microwave signal to an optical carrier to generate a modulated optical signal of a multi-order optical sideband; an optical filter for filtering the modulated optical signal output by the phase modulator; and the photoelectric detector is used for converting the optical signal into an electric signal and outputting the electric signal, namely the filtered odd-order high-order harmonic component.
When the amplitude of the modulated signal is small, only the optical carrier, 1 st order, ± 2 nd order, ± 3 rd order sidebands are considered. Assuming that the center frequency of the optical filter is less than the frequency corresponding to the wavelength of the optical carrier, when the frequency of the microwave signal is lower, the output of the phase modulator and the output spectrum of the optical filter are respectively shown as (i) and (ii) in fig. 2, as the phases of the +/-1 order sidebands are opposite and are respectively offset after beat frequency of the carrier, fundamental wave components do not exist, the +1 order sidebands and the-1 order sidebands, the +3 order sidebands and the +1 order sidebands, the-3 order sidebands and the-1 order sidebands, and the +/-2 order sidebands and the optical carrier beat frequency are offset, so second harmonic components do not exist, the +2 order sidebands and the-1 order sidebands, the +1 order sidebands and the-2 order sidebands, and the +/-3 order sidebands and the optical carrier beat frequency are offset, and third harmonic components do not exist; when the frequency of the microwave signal is satisfied, the +1 order sideband and the-2 order sideband are in the passband of the optical filter, and the +2 order sideband is out of the passband of the optical filter, the output spectrum of the phase modulator and the output spectrum of the optical filter are shown as (i) and (ii) in fig. 3 respectively, and the +1 order sideband and the-2 order sideband can beat a third harmonic microwave signal; when the frequency of the microwave signal meets the condition that-2 order sidebands are outside the passband, the output spectra of the light source, the phase modulator and the optical filter are respectively shown as (i) and (ii) in fig. 4, at this time, the passband only contains optical carriers and +/-1 order sidebands, and the +/-1 order sidebands are respectively offset after beat frequency of the carriers. Thus, a microwave photonic filter is realized that filters the third harmonic of the microwave signal. The principle is similar when the optical filter center frequency is greater than the frequency corresponding to the optical carrier wavelength.
Assuming that the difference between the center frequency of the optical filter and the corresponding frequency of the light source wavelength is Δ f, and the passband width is BW, the initial frequency of the microwave photonic filter of the embodiment can be obtained
Frequency of termination
The center frequency of the microwave photonic filter
Bandwidth ofIs composed of
The simulation is performed on the microwave photonic filter of the third harmonic by using Opti system simulation software, when the frequency of the sweep frequency signal loaded on the phase modulator is 30-45 GHz, the bandwidth BW of the optical filter is set to 132GHz, Δ f is 1GHz, and after the beat frequency of the photodetector, the filter response curve of the microwave photonic filter is obtained as shown in fig. 5, which shows that the center frequency of the microwave photonic filter is 99GHz, the bandwidth is 3GHz, and the center frequency is consistent with the theoretical value.
The tunable pass band width of the microwave photon filter can be realized by changing the wavelength of an optical carrier of the light source module or the central frequency of the optical band-pass filter; by varying the bandwidth of the optical filter, tunability of the center frequency of the microwave photonic filter can be achieved. The reconfigurability of the microwave photonic filter for this odd higher order harmonic is thus achieved.
Compared with the traditional linear microwave photon filter, the invention fully utilizes the nonlinearity of the phase modulator, realizes the filtering of odd high-order harmonic waves of microwave signals, and improves the filtering frequency of the microwave photon filter to the W wave band or even higher frequency band; and the center frequency and the pass band width of the tunable optical filter can be tuned, and the wavelength of the light source can be tuned, so that the reconfigurability of the microwave photonic filter is realized.
Claims (5)
1. A microwave photon filtering method is characterized in that a microwave signal with the frequency f is used for carrying out phase modulation on an optical carrier to generate a modulated optical signal of an n-order optical sideband, wherein n is an integer greater than or equal to 2; filtering the modulated optical signal with an optical bandpass filter having a passband width BW with a center frequency different from the optical carrier by Δ f, wherein,
fBW、fcrespectively filtering the bandwidth and the central frequency of a passband by the microwave photon filtering method; and performing photoelectric conversion on the filtered modulated optical signal to obtain 2n-1 order harmonic component of the microwave signal.
2. The microwave photonic filtering method of claim 1, wherein at least one of the following three parameters is adjustable: the frequency of the optical carrier, the center frequency of the passband of the optical bandpass filter, and the width of the passband of the optical bandpass filter.
3. A microwave photonic filtering device, comprising:
the light source module is used for generating optical carriers;
the phase modulation module is used for carrying out phase modulation on an optical carrier by using a microwave signal with the frequency of f to generate a modulated optical signal of an n-order optical sideband, wherein n is an integer greater than or equal to 2;
an optical bandpass filter for filtering the modulated optical signal, wherein the frequency difference Δ f between the center frequency and the optical carrier and the passband width BW satisfy
Wherein f isBW、fcThe bandwidth and the center frequency of a filter passband of the microwave photon filter device are respectively;
and the photoelectric detector is used for performing photoelectric conversion on the filtered modulated optical signal to obtain 2n-1 order harmonic component of the microwave signal.
4. The microwave photonic filtering apparatus of claim 3, wherein at least one of the following three parameters is adjustable: the frequency of the optical carrier, the center frequency of the passband of the optical bandpass filter, and the width of the passband of the optical bandpass filter.
5. The microwave photonic filtering apparatus of claim 4, wherein said optical bandpass filter is a programmable optical filter.
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