CN107947867B - Single-sideband spectrum generation device and method based on multi-frequency phase modulation - Google Patents
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Abstract
The invention provides a single-sideband frequency spectrum generating device and method based on multi-frequency phase modulation, and relates to a single-sideband frequency spectrum generating device and method. The device comprises a narrow-linewidth laser source, an electro-optic modulator, a spectrum measuring system, an arbitrary waveform generator and a radio frequency signal amplifier; the method comprises the following steps: firstly, introducing a single-frequency signal output by a narrow-line-width laser source into an electro-optic modulator; secondly, obtaining a multi-frequency modulation electrical signal waveform based on the spectrum analysis reverse calculation, and setting an arbitrary waveform generator to generate a corresponding multi-frequency modulation electrical signal; amplifying the modulated electric signal by a radio frequency signal amplifier, and then transmitting the amplified modulated electric signal to an electro-optical modulator; and step four, outputting the optical signal formed after modulation to a spectrum measurement system for spectrum structure analysis. The invention solves the problems of low energy conversion efficiency and complex structure of signals in the prior art. The invention can be applied to wireless communication.
Description
Technical Field
The invention relates to a single sideband spectrum generating device and a method.
Background
With the increasing demand for broadband wireless communication, wireless communication is continuously expanding toward high frequency bands. However, due to the processing rate limitation, the conventional electronic technology is not satisfactory for processing high-speed microwave signals. Further, as the frequency increases, the transmission loss of the microwave signal in the air increases, and long-distance transmission is not possible. The photon has huge bandwidth, and the photon technology is adopted to process high-speed microwave signals, so that the limitation of processing rate bottleneck of the electronic technology can be eliminated, and the anti-electromagnetic interference capability is strong. In addition, the transmission loss of signals in the optical fiber is extremely low, and long-distance transmission of microwave signals can be realized by means of optical fiber communication technology, which is typically represented by Radio Over Fiber (ROF).
in the ROF system, the signal measured by the optical receiver periodically fades due to the influence of the dispersion of the optical fiber link. If a single frequency carrier signal is converted to an optical double sideband signal (ODSB), the upper and lower sidebands have the same amplitude and phase. After dispersion in the fiber, the upper and lower sidebands experience different delays, which produce a dispersion-dependent phase shift. If the phase shift is pi, when a receiving end detects, two side frequencies beat with the carrier respectively to generate two Radio Frequency (RF) signals with the same amplitude and opposite phases, the two radio frequency signals are superposed and offset with each other, and the power of the RF signal output by the optical detector is 0. The total RF signal is subject to different degrees of fading when the phase shift varies between 0 and pi. Such periodic fading of the detected signal will affect the efficiency and reliability of fiber optic communications.
The most cost-effective way to solve this problem of periodic fading of RF signals is to use the optical single sideband modulation (OSSB-modulator). The specific idea is to eliminate the influence of dispersion on the modulated light wave signal in the optical fiber, so that the signal received by the optical detector is a beat frequency signal of a modulation sideband and a carrier, the utilization rate of a frequency band is improved, and the transmission capacity is increased.
At present, people adopt a plurality of methods to obtain OSSB signals, and according to the implementation principle, the OSSB signals can be classified into three types: (1) filtering one sideband in the ODSB signal by adopting an optical filter to obtain optical single sideband signal output; (2) amplifying one sideband in the ODSB to obtain an optical single sideband signal; (3) the optical single sideband signal is directly obtained by using an OSSB modulator.
In 2005, spain capmann et al utilized two sets of Fiber Bragg Grating Arrays (FBGAs) in series to generate a multi-wavelength OSSB signal. The tunable fiber laser array generates multi-wavelength fiber laser, the multi-wavelength fiber laser is injected into an electro-optical modulator, each fiber laser is modulated into a double-sideband laser signal in a longitudinal and transverse mode, and then one sideband is filtered by using the FBGA to obtain the multi-wavelength OSSB signal. The method has better performances in the aspects of insertion loss, carrier rejection effect, bandwidth and the like. As long as a high-quality, high-reflectivity FBG filter is used, the applied frequency range may extend from the millimeter wave to the entire microwave bandwidth range. In 2012, Tang et al used a phase modulator to generate the ODSB signal, and then utilized a tunable optical bandpass filter to filter one of the sidebands to obtain the OSSB signal. And the optical vector network analyzer is applied to an optical vector network analyzer, so that higher resolution is realized. In 2016, Song et al, Australia proposed a silicon-on-insulator based single sideband modulator with a coupled-resonator optical waveguide filter, in which the OSSB signal was transmitted through a dispersive element, and the fluctuation of the RF signal measured by the photodetector was less than 2 dB. The method for realizing the single-sideband modulation signal by using the optical filter has the disadvantages that the use of the filter can fixedly consume a part of sideband energy, and the energy conversion efficiency of the signal is not high.
In 2005, y.shen et al proposed a ROF system that produced 11GHz optical single sideband modulation. The stimulated Brillouin scattering effect in the optical fiber is used, so that the modulation signal of the lower sideband is amplified, and the modulation signal of the upper sideband is weakened, thereby improving the performance of the system and obtaining the signal-to-noise ratio gain of 2 dB. Because the Brillouin frequency shift in the optical fiber is about 11GHz, the frequency of the modulated radio frequency signal is 11 GHz. The OSSB signal generation method is essentially to transfer the energy on one sideband to the other through the stimulated Brillouin scattering effect of the optical fiber, and has higher efficiency compared with the scheme using the optical filter; however, this method has been developed based on nonlinear optical effects and the stability of the resulting single sideband modulated signal is limited.
In 2008, massella et al, canada, proposed a linear single sideband Mach-Zehnder electro-optic modulator that used a dual drive Mach-Zehnder modulator biased at a quadrature transmission point, driven by two RF signals with respective phase shifts of pi. By proper design, better modulation results are obtained. The system requires a phase shifter to control the phase shift of the two RF drive signals, and is not simple enough in structure and operation.
The intensity ratio of each order modulated signal in the sideband can be controlled by using a multi-frequency phase modulation technique, and is currently used for generating special spectral line structures. The subject group of the teaching of Lushiwei of Harbin Industrial university realizes the generation of the constant-amplitude spectral structure by using a multi-frequency phase modulation technology, and dozens of constant-amplitude spectral line outputs are obtained by reasonably designing the ratio of each frequency component in a modulation signal (patent number: 200710144442.3).
Disclosure of Invention
The invention provides a single-sideband spectrum generating device and method based on multi-frequency phase modulation, aiming at solving the problems of low energy conversion efficiency and complex structure of signals in the prior art.
the invention relates to a single sideband frequency spectrum generating device based on multi-frequency phase modulation, which comprises: the device comprises a narrow-linewidth laser source, an electro-optic modulator, a spectrum measurement system, an arbitrary waveform generator and a radio frequency signal amplifier;
The output optical fiber of the narrow-linewidth laser source is connected with the input end of the electro-optical modulator, and a single-frequency signal output by the narrow-linewidth laser source is led into the electro-optical modulator;
the input end of the radio frequency signal amplifier is connected with an arbitrary waveform generator, the output end of the radio frequency signal amplifier is connected with the electro-optical modulator, and the output end of the electro-optical modulator is connected with a spectrum measurement system; the random waveform generator generates a multi-frequency modulation electric signal, the multi-frequency modulation electric signal is amplified by a radio frequency signal amplifier and then is transmitted to the electro-optic modulator; the electro-optical modulator carries out phase modulation on a single-frequency signal entering the electro-optical modulator according to the multi-frequency modulation electric signal, and outputs the modulated optical signal to the spectrum measurement system.
the invention relates to a method for generating a single sideband frequency spectrum based on multi-frequency phase modulation, which is realized by the following technical scheme:
Firstly, introducing a single-frequency signal output by a narrow-line-width laser source into an electro-optic modulator;
Secondly, obtaining a multi-frequency modulation electrical signal waveform based on the spectral analysis reverse calculation, and setting an arbitrary waveform generator to generate a corresponding multi-frequency modulation electrical signal according to the calculation result;
Amplifying the multi-frequency modulation electric signal by a radio frequency signal amplifier, and then transmitting the multi-frequency modulation electric signal to an electro-optical modulator; the electro-optical modulator is driven by a multi-frequency modulation electric signal amplified by the radio-frequency signal amplifier to perform phase modulation on a single-frequency signal entering the electro-optical modulator, and the single-frequency signal is modulated;
Step four, outputting the optical signal formed after modulation to a spectrum measurement system for spectrum structure analysis; a single spectral line of an original single-frequency signal carrier wave is split into a plurality of spectral lines, the intensity of one spectral line is far greater than that of other spectral lines, and a spectrum presents a single-sideband structure.
The most prominent characteristics and remarkable beneficial effects of the invention are as follows:
The invention has simple structure, and can realize single side band modulation signal output only by using one electro-optical modulator and one radio frequency driver. The energy conversion efficiency is high, an optical filter is not used in the invention, and the corresponding insertion loss is reduced to some extent; in addition, the multi-frequency phase modulation transfers the signal power of one sideband of the ODSB to the other sideband instead of directly filtering, the two aspects jointly result in the extremely high energy conversion efficiency of the invention, the side frequency intensity in a simulation experiment is only reduced by 0.56dB compared with the carrier signal intensity before modulation, and the energy conversion efficiency reaches 88%.
Drawings
FIG. 1 is a schematic structural diagram of a single-sideband spectrum generating device based on multi-frequency phase modulation according to the present invention;
FIG. 2 is a waveform diagram of a modulated electrical signal for implementing single sideband modulation;
fig. 3 is a power spectrum image of signal light before and after single-frequency signal modulation;
1. the device comprises a narrow-linewidth laser source, 2 an electro-optical modulator, 3 a spectral measurement system, 4 an arbitrary waveform generator and 5 a radio frequency signal amplifier.
Detailed Description
The first embodiment is as follows: as shown in fig. 1, the single-sideband spectrum generating apparatus based on multi-frequency phase modulation according to the present embodiment includes a narrow-linewidth laser source 1, an electro-optical modulator 2, a spectrum measuring system 3, an arbitrary waveform generator 4, and a radio frequency signal amplifier 5;
The output optical fiber of the narrow-linewidth laser source 1 is connected with the tail fiber of the input end of the electro-optical modulator 2, and a single-frequency signal output by the narrow-linewidth laser source 1 is led into the electro-optical modulator 2;
The input end of the radio frequency signal amplifier 5 is connected with an arbitrary waveform generator 4, the output end of the radio frequency signal amplifier 5 is connected with the electro-optical modulator 2, and the output end of the electro-optical modulator 2 is connected with the spectrum measuring system 3; the arbitrary waveform generator 4 generates a multi-frequency modulation electric signal, the multi-frequency modulation electric signal is amplified by the radio frequency signal amplifier 5 and then is transmitted to the electro-optical modulator 2; the electro-optical modulator 2 performs phase modulation on the single-frequency signal entering the electro-optical modulator 2 according to the multi-frequency modulation electric signal, and outputs the modulated optical signal to the spectrum measurement system 3.
In this apparatus, when no phase modulation is performed or the amplitude of the modulated electric signal applied to the electro-optical modulator 2 is 0, only the carrier component is contained in the spectrum measured in the spectrum measuring system 3; when a modulation electric signal is applied to the electro-optical modulator 2, the single-frequency signal output by the narrow-linewidth laser source 1 is modulated, a single spectral line of the original single-frequency signal is split into a plurality of spectral lines, and the modulated spectrum is capable of showing a single-side band structure along with the adjustment of the modulation electric signal.
the second embodiment is as follows: the present embodiment is different from the first embodiment in that the spectrum measuring system 3 is a spectrum analyzer, or a scanning fabry-perot interferometer.
Other steps and parameters are the same as those in the first embodiment.
the third concrete implementation mode: this embodiment differs from the first embodiment in that the narrow linewidth laser source 1 is provided by a narrow linewidth semiconductor laser. The wavelengths of the common communication bands are 1550nm and 1310nm, and the wavelength of the common laser medical band is 1064 nm.
Other steps and parameters are the same as those in the first embodiment.
The fourth concrete implementation mode: the embodiment is described with reference to fig. 1, and the method for generating a single-sideband spectrum based on multi-frequency phase modulation according to the embodiment specifically includes the following steps:
firstly, introducing a single-frequency signal output by a narrow-line-width laser source into an electro-optic modulator;
secondly, obtaining a multi-frequency modulation electrical signal waveform based on the spectral analysis reverse calculation, and setting an arbitrary waveform generator to generate a corresponding multi-frequency modulation electrical signal according to the calculation result;
amplifying the multi-frequency modulation electric signal by a radio frequency signal amplifier, and then transmitting the multi-frequency modulation electric signal to an electro-optical modulator; the electro-optical modulator is driven by a multi-frequency modulation electric signal amplified by the radio-frequency signal amplifier to perform phase modulation on a single-frequency signal entering the electro-optical modulator, and the single-frequency signal is modulated;
step four, outputting the optical signal formed after modulation to a spectrum measurement system for spectrum structure analysis; a single spectral line of an original single-frequency signal is split into a plurality of spectral lines, the intensity of one spectral line is far greater than that of other spectral lines, and a spectrum presents a single-sideband structure.
The fifth concrete implementation mode: the difference between this embodiment and the fourth embodiment is that the process of calculating the waveform of the multi-frequency modulated electrical signal in the second step includes:
Step two, the fundamental frequency of the multi-frequency modulation electric signal m (t) is fmthe Fourier expansion of m (t) is as follows:
In the formula (1) < gamma >, (kand phikRespectively representing the modulation index and the initial phase of the k-th harmonic in the multi-frequency modulation electric signal, wherein t represents time;
Step two, setting a multi-frequency modulation electric signal waveform gammak＝0、φk0, modulation index gamma of the waveform of the multi-frequency modulated electric signal, i.e. the k-th harmonickand an initial phase phikvalue combination of (1);
step two and step three, under the action of the modulation electric signal, neglecting the direct current component in the multi-frequency modulation electric signal, namely the direct current component gamma00, the time domain expression of the modulated single-frequency signal is:
Wherein f iscthe frequency of a single-frequency signal output by a narrow-linewidth laser source, j is an imaginary number unit; e (t) refers to the amplitude of the modulated optical signal;
performing Fourier series expansion on the right side of the formula (2) to obtain:
wherein n is1、n2、nkIs (- ∞),Infinity) is used as a whole number of the unit,Is a Bessel function; the optical signal after multi-frequency phase modulation has a series of frequency intervals fmdiscrete spectral lines of (a);
Calculating the frequency spectrum structure of the modulated optical signal satisfying the formula (2) and the formula (3) through mathematical simulation software;
Step two, the spectrum structure obtained in the step two is compared with the set target single-sideband modulation signal, and if the error between the spectrum structure and the target single-sideband modulation signal is within the set precision requirement range, the waveform of the multi-frequency modulation electrical signal is selected as a calculation result; if the contrast error is not in the precision requirement range, gamma is determinedk＝γk+0.01, i.e. gammakThe value of (2) is increased by 0.01, and the steps two, three, two and four are repeated until the multi-frequency modulation electric signal waveform meeting the conditions is obtained.
Target single sideband modulated signal, i.e. predetermined optical signal, as a series of frequency intervals fmAnd a single sideband modulated signal where the intensity of one spectral line is much greater than the intensity of the other spectral lines. The steps are increased by gamma in equal stepskThe value of (2) is selected to obtain a multi-frequency modulation electric signal waveform, and compared with a target single-sideband modulation signal, an optical signal generated after modulation can meet the precision requirement range.
the set precision requirement range comprises a carrier suppression ratio R1 range and a side-frequency suppression ratio R2 range.
Other steps and parameters are the same as those in the fourth embodiment.
the sixth specific implementation mode: the fourth difference between the present embodiment and the fourth embodiment is that the fundamental frequency of the electrical multi-frequency modulation signal is 1kHz to 40 GHz.
Other steps and parameters are the same as those in the fourth or fifth embodiment.
The seventh embodiment: the sixth difference between this embodiment and the sixth embodiment is that the value of the fundamental frequency of the electrical multi-frequency modulation signal is 10.8 GHz.
The other steps and parameters are the same as those in the fourth, fifth or sixth embodiment.
The specific implementation mode is eight: in a fourth embodiment, the electrical multi-frequency modulation signal applied to the electro-optical modulator in step three comprises fm、2fm、…、kfmK frequencies, k ∈ [2,10 ]]Phase of each frequency component phikAre all 0.
The other steps and parameters are the same as those of the fourth, fifth, sixth or seventh embodiments.
examples
the following examples were used to demonstrate the beneficial effects of the present invention:
the method for generating the single-sideband spectrum based on the multi-frequency phase modulation according to the embodiment is carried out according to the following steps:
As shown in fig. 1, the device is connected first: connecting an output optical fiber of a narrow-linewidth laser source 1 with a tail fiber of an input end of an electro-optical modulator 2, and introducing a single-frequency signal output by the narrow-linewidth laser source 1 into the electro-optical modulator 2; the input end of a radio frequency signal amplifier 5 is connected with an arbitrary waveform generator 4, the output end of the radio frequency signal amplifier 5 is connected with the electro-optical modulator 2, the output end of the electro-optical modulator 2 is connected with a spectrum measuring system 3, and the spectrum measuring system 3 in the embodiment adopts a spectrum analyzer;
The narrow-linewidth laser light source is provided by a narrow-linewidth semiconductor laser with the wavelength of 1550nm, as shown in fig. 2, the arbitrary waveform generator 4 is set to generate a multi-frequency modulation electric signal as follows: comprising fm、2fm、3fm、4fm、5fm、6fm、7fm、8fm、9fm、10fmEqual 10-frequency multi-frequency modulated electric signal, fundamental frequency f of multi-frequency modulated electric signalmis 10.8GHz, the carrier rejection ratio R1 is set to be more than or equal to 20dB, the side frequency rejection ratio R2 is set to be more than or equal toAt 18dB, calculating to obtain a multi-frequency modulation electrical signal waveform gamma meeting the requirement1＝1.9900、γ2＝0.9800、γ3＝0.6400、γ4＝0.4700、γ5＝0.3600、γ6＝0.2900、γ7＝0.2300、γ8＝0.2700、γ9＝0.2800、γ100.2400, phase phi of each frequency componentkAre all 0.
When the amplitude of the electrical multi-frequency modulated signal is 0, i.e., no modulation signal is applied, the spectral line structure measured in the spectrum analyzer is shown by the dashed line in fig. 3, and only the carrier component exists. If the calculated multi-frequency modulation electrical signal waveform is added to the electro-optical modulator 2, the modulation spectrum shown by the solid line in fig. 3 can be obtained, and it can be seen that the upper side frequency component in the spectral line structure is effectively suppressed, the side frequency suppression ratio is about 18.5dB, the carrier is also well suppressed, the carrier suppression ratio is about 24.3dB, and a better single-side-band signal is obtained. Another advantage is the high signal utilization, as is evident from fig. 3, that the first order sideband intensity of the modulated signal is reduced by only 0.56dB compared to the carrier signal intensity before modulation.
the present invention is capable of other embodiments and its several details are capable of modifications in various obvious respects, all without departing from the spirit and scope of the present invention.
Claims (8)
1. The single-sideband spectrum generating device based on the multi-frequency phase modulation is characterized by comprising a narrow-linewidth laser source, an electro-optical modulator, a spectrum measuring system, an arbitrary waveform generator and a radio-frequency signal amplifier;
the output optical fiber of the narrow-linewidth laser source is connected with the input end of the electro-optical modulator, and a single-frequency signal output by the narrow-linewidth laser source is led into the electro-optical modulator;
the input end of the radio frequency signal amplifier is connected with an arbitrary waveform generator, the output end of the radio frequency signal amplifier is connected with the electro-optical modulator, and the output end of the electro-optical modulator is connected with a spectrum measurement system; the random waveform generator generates a multi-frequency modulation electric signal, the multi-frequency modulation electric signal is amplified by a radio frequency signal amplifier and then is transmitted to the electro-optic modulator; the electro-optical modulator carries out phase modulation on a single-frequency signal entering the electro-optical modulator according to the multi-frequency modulation electric signal, and outputs the modulated optical signal to the spectrum measurement system.
2. The apparatus for generating single sideband spectrum based on multifrequency phase modulation of claim 1, wherein: the spectrum measuring system is a spectrum analyzer, a spectrum analyzer or a scanning Fabry-Perot interferometer.
3. the apparatus for generating single sideband spectrum based on multifrequency phase modulation of claim 1, wherein: the narrow linewidth laser source is provided by a narrow linewidth semiconductor laser.
4. A method for generating a single sideband spectrum using the apparatus of claim 1, said method comprising the steps of:
Firstly, introducing a single-frequency signal output by a narrow-line-width laser source into an electro-optic modulator;
Secondly, obtaining a multi-frequency modulation electrical signal waveform based on the spectral analysis reverse calculation, and setting an arbitrary waveform generator to generate a corresponding multi-frequency modulation electrical signal according to the calculation result;
Amplifying the multi-frequency modulation electric signal by a radio frequency signal amplifier, and then transmitting the multi-frequency modulation electric signal to an electro-optical modulator; the electro-optical modulator is driven by a multi-frequency modulation electric signal amplified by the radio-frequency signal amplifier to perform phase modulation on a single-frequency signal entering the electro-optical modulator, and the single-frequency signal is modulated;
Step four, outputting the optical signal formed after modulation to a spectrum measurement system for spectrum structure analysis; a single spectral line of an original single-frequency signal is split into a plurality of spectral lines, the intensity of one spectral line is far greater than that of other spectral lines, and a spectrum presents a single-sideband structure.
5. The method of generating a single sideband spectrum of claim 4, wherein the step two of calculating the waveform of the multi-frequency modulated electrical signal comprises:
Step two, the fundamental frequency of the multi-frequency modulation electric signal m (t) is fmthe Fourier expansion of m (t) is as follows:
in the formula (1) < gamma >, (kand phikRespectively representing the modulation index and the initial phase of the k-th harmonic in the multi-frequency modulation electric signal, wherein t represents time;
Step two, setting a multi-frequency modulation electric signal waveform gammak＝0、φk0, modulation index gamma of the waveform of the multi-frequency modulated electric signal, i.e. the k-th harmonickand an initial phase phikValue combination of (1);
Step two and step three, neglecting the direct current component in the multi-frequency modulation electric signal, namely the direct current component gamma00, the time domain expression of the modulated single-frequency signal is:
wherein f iscthe frequency of a single-frequency signal output by a narrow-linewidth laser source, j is an imaginary number unit; e (t) refers to the amplitude of the modulated optical signal;
performing Fourier series expansion on the right side of the formula (2) to obtain:
Wherein n is1、n2、nkIs an integer of (-infinity, ∞),Is BesselA function; the optical signal after multi-frequency phase modulation has a series of frequency intervals fmdiscrete spectral lines of (a);
Calculating the frequency spectrum structure of the modulated optical signal satisfying the formula (2) and the formula (3) through mathematical simulation software;
step two, the spectrum structure obtained in the step two is compared with a set target single-sideband modulation signal, and if the error between the spectrum structure and the target single-sideband modulation signal is within a set precision requirement range, the waveform of the multi-frequency modulation electrical signal is selected as a calculation result; if the contrast error is not in the precision requirement range, gamma is determinedk＝γk+0.01, i.e. gammakThe value of (2) is increased by 0.01, and the steps two, three, two and four are repeated until the multi-frequency modulation electric signal waveform meeting the conditions is obtained.
6. Method for generating a single sideband spectrum according to claim 4, characterized in that: the value of the fundamental frequency of the multi-frequency modulation electric signal is 1 kHz-40 GHz.
7. The method of generating a single sideband spectrum of claim 6, wherein: the fundamental frequency of the multi-frequency modulation electric signal takes 10.8 GHz.
8. Method for generating a single sideband spectrum according to claim 4, characterized in that: the electrical multi-frequency modulated signal applied to the electro-optical modulator in step three comprisesm、2fm、...、kfmK frequencies, k ∈ [2,10 ]]Phase of each frequency component phikAre all 0.
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