CN113900315A - Low stray high order frequency multiplication system and method based on optical sideband injection locking - Google Patents
Low stray high order frequency multiplication system and method based on optical sideband injection locking Download PDFInfo
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Abstract
The application provides a low stray high-order frequency multiplication system and method based on optical sideband injection locking, wherein the method comprises the following steps: outputting narrow-band baseband linear frequency modulation waves, generating a plurality of optical sidebands through a high-order optical sideband module, and respectively filtering out two target optical sidebands from a frequency domain; one end of an output port of the optical filter is connected with the optical frequency shift module, frequency shift operation is carried out on one target optical sideband, the output of the optical frequency shift module is injected into one DFB laser through one circulator, the other end of the output port of the optical filter is used for injecting the other target optical sideband into the other DFB laser through the one circulator to obtain an injection locking result, the injection locking result is jointly input into the coupler, the output of the injection locking DFB laser is input into the photoelectric detector after being coupled, and a beat frequency is output in the photoelectric detector to obtain a high-order frequency doubling signal. The invention effectively solves the problems of large stray interference and insufficient frequency doubling order of the traditional photon frequency doubling technology by injecting and locking the sideband.
Description
Technical Field
The invention relates to the technical field of signal generation and processing, in particular to a low-stray high-order frequency multiplication system and method based on optical sideband injection locking.
Background
Frequency doubling systems based on photonic technology utilize the non-linearity of optoelectronic devices (modulators, amplifiers, etc.) to generate high order optical sidebands by modulating a narrow band low frequency baseband signal. High-order positive and negative sideband beat frequency, and further generate broadband high-frequency multiplication signals. Photon frequency doubling systems are widely used for the generation of chirped broadband radar signals and high frequency local oscillation sources. The method can expand the bandwidth and frequency of the signal and simultaneously keep the excellent characteristics of the signal, such as low time jitter, high linear frequency modulation and the like. Conventional photonic frequency doubling systems tend to contain a large number of other order optical sidebands while generating the target optical sidebands. After beat frequency, the frequency multiplication signal contains a large amount of spurious components, which can cause serious interference to the application of a radar system. When applied to frequency multiplication of a wideband signal such as a chirp signal, the spurious component may overlap with a target signal in a frequency spectrum, and the spurious component cannot be filtered out by a simple frequency-domain filter. On the other hand, due to the limited nonlinearity of the modulator and amplifier, the generated high-order optical sideband power is weak, resulting in limited frequency multiplication order and poor noise performance. Therefore, how to suppress the stray component in the frequency doubling signal and improve the photon frequency doubling order are two problems to be solved urgently by the photon frequency doubling system.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, a first objective of the present invention is to provide a low spurious high-order frequency doubling system based on optical sideband injection locking, which can filter spurious components that are aliased with a target signal in both frequency domain and time domain by using optical sideband injection locking, aiming at the problems of serious spurious interference and insufficient frequency doubling order in the conventional frequency doubling system.
The second objective of the present invention is to provide a low spurious higher order frequency multiplication method based on optical sideband injection locking.
To achieve the above object, an embodiment of a first aspect of the present invention provides a low spurious higher order frequency doubling system based on optical sideband injection locking, including:
the waveform generator is used for outputting narrow-band baseband linear frequency modulation waves and entering the high-order optical sideband generation module;
the high-order optical sideband generation module is connected with the optical filter and used for generating a plurality of optical sidebands through the high-order optical sideband generation module and filtering the plurality of optical sidebands into two target optical sidebands from a frequency domain through the optical filter;
one end of an output port of the optical filter is connected with the optical frequency shift module and is used for carrying out frequency shift operation on a target optical sideband, the output of the optical frequency shift module is injected into one DFB laser through one circulator, and the other end of the output port of the optical filter is used for injecting the other target optical sideband into the other DFB laser through the other circulator so as to obtain an injection locking result and inputting the injection locking result into the coupler together; wherein the output optical signal frequency of the injection-locked DFB laser is consistent with the injected two target optical sideband frequencies, and unlocked spurious components are suppressed; the DFB laser is driven by two sawtooth-shaped currents, so that the frequency difference between the free-running output frequency of the DFB laser and the target optical sideband is smaller than the injection locking range of the DFB laser;
the coupler is connected with the photoelectric detector and is used for coupling the output of the injection locked DFB laser and inputting the coupled output into the photoelectric detector;
and the photoelectric detector is used for outputting beat frequency in the photoelectric detector to obtain a high-order frequency doubling signal.
In addition, the low spurious higher order frequency multiplication system based on optical sideband injection locking according to the above embodiment of the present invention may also have the following additional technical features:
further, in an embodiment of the present invention, the DFB laser is configured to inject locking to the target optical sideband and also configured to lock to weak higher-order optical sidebands.
Further, in an embodiment of the present invention, the output power of the DFB laser is greater than the target optical sideband power, so as to improve the power and signal-to-noise ratio of the injected target optical sideband.
Further, in an embodiment of the present invention, the high-order optical sideband generation module is implemented by cascading a phase modulator and an intensity modulator.
Further, in an embodiment of the present invention, the method further includes: and the optical frequency shift module is used for randomly tuning the center frequency of the frequency doubling signal by adjusting the frequency of the local oscillator signal driving the optical frequency shift module.
The low-stray high-order secondary frequency multiplication system based on optical sideband injection locking is used for outputting narrow-band baseband linear frequency modulation waves through a waveform generator and entering a high-order optical sideband generation module; the high-order optical sideband generation module is connected with the optical filter and used for generating a plurality of optical sidebands through the high-order optical sideband generation module and filtering the plurality of optical sidebands from a frequency domain through the optical filter to obtain two target optical sidebands; one end of an output port of the optical filter is connected with the optical frequency shift module and is used for carrying out frequency shift operation on a target optical sideband, the output of the optical frequency shift module is injected into one DFB laser through one circulator, and the other end of the output port of the optical filter is used for injecting the other target optical sideband into the other DFB laser through the other circulator so as to obtain an injection locking result and inputting the injection locking result into the coupler together; the output optical signal frequency of the DFB laser subjected to injection locking is kept consistent with the two injected target optical sideband frequencies, and unlocked stray components are suppressed; the DFB laser is driven by two sawtooth-shaped currents, so that the frequency difference between the free running output frequency of the DFB laser and a target optical sideband is smaller than that between an injection locking range coupler of the DFB laser and a photoelectric detector, and the injection locking range coupler is used for coupling the output of the injection locking DFB laser and inputting the coupled output into the photoelectric detector; and the photoelectric detector is used for outputting beat frequency in the photoelectric detector to obtain a high-order frequency doubling signal. The invention effectively solves the problems of large stray interference and insufficient frequency doubling order of the traditional photon frequency doubling technology by injecting and locking the sideband.
In order to achieve the above object, a second aspect of the present invention provides a low spurious higher order frequency multiplication method based on optical sideband injection locking, including the following steps:
outputting narrow-band baseband linear frequency modulation waves;
generating a plurality of optical sidebands by passing the narrow-band baseband linear frequency modulation waves through a high-order optical sideband module, and filtering the plurality of optical sidebands out two target optical sidebands from a frequency domain respectively;
one end of an output port of the optical filter is connected with the optical frequency shift module, frequency shift operation is carried out on a target optical sideband, the output of the optical frequency shift module is injected into one DFB laser through one circulator, and the other end of the output port of the optical filter is used for injecting the other target optical sideband into the other DFB laser through the other circulator so as to obtain an injection locking result and inputting the injection locking result into the coupler together; wherein the output optical signal frequency of the injection-locked DFB laser is consistent with the injected two target optical sideband frequencies, and unlocked spurious components are suppressed; the DFB laser is driven by two sawtooth-shaped currents, so that the frequency difference between the free-running output frequency of the DFB laser and the target optical sideband is smaller than the injection locking range of the DFB laser;
coupling the output of the injection locked DFB laser and inputting the coupled output into a photoelectric detector;
and outputting beat frequency in the photoelectric detector to obtain a high-order frequency doubling signal.
The low stray high-order frequency multiplication method based on optical sideband injection locking of the embodiment of the invention outputs narrowband baseband linear frequency modulation waves; generating a plurality of optical sidebands by passing narrow-band baseband linear frequency modulation waves through a high-order optical sideband module, and respectively filtering the plurality of optical sidebands from a frequency domain to obtain two target optical sidebands; one end of an output port of the optical filter is connected with the optical frequency shift module, frequency shift operation is carried out on a target optical sideband, the output of the optical frequency shift module is injected into one DFB laser through one circulator, and the other end of the output port of the optical filter is used for injecting the other target optical sideband into the other DFB laser through the other circulator so as to obtain an injection locking result and jointly input the injection locking result into the coupler; the output optical signal frequency of the DFB laser subjected to injection locking is kept consistent with the two injected target optical sideband frequencies, and unlocked stray components are suppressed; the DFB laser is driven by two sawtooth-shaped currents, so that the frequency difference between the free-running output frequency of the DFB laser and a target optical sideband is smaller than the injection locking range of the DFB laser; coupling the output of the injection locked DFB laser and inputting the coupled output into a photoelectric detector; and outputting beat frequency in the photoelectric detector to obtain a high-order frequency doubling signal. The invention effectively solves the problems of large stray interference and insufficient frequency doubling order of the traditional photon frequency doubling technology by injecting and locking the sideband.
The invention has the beneficial effects that:
by using injection locking of the optical sideband, spurious components which are aliasing with a target signal in both a frequency domain and a time domain can be filtered out. The invention effectively solves the problems of large stray interference and insufficient frequency doubling order of the traditional photon frequency doubling technology by injecting and locking the sideband. The invention is expected to be applied to broadband radar imaging, spectrum sensing and future 6G new-generation communication systems, and provides a high-quality high-frequency broadband signal source for the broadband radar imaging, spectrum sensing and future 6G new-generation communication systems.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
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The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of a low spurious higher order frequency multiplication system based on optical sideband injection locking according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a higher order frequency doubling system based on optical sideband injection locking according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating an embodiment of a higher order frequency doubling system based on optical sideband injection locking according to the present invention;
FIG. 4 is a schematic diagram of a high-order sideband generation module output spectrum according to one embodiment of the invention;
FIG. 5 is a frequency spectrum and frequency plot of a fundamental frequency-doubled, frequency-tripled, and frequency-quadrupled signal according to an embodiment of the present invention;
FIG. 6 is a graph of a spectrum of a ten-fold frequency signal according to one embodiment of the invention;
FIG. 7 is a spectral diagram of a ten-fold frequency signal with an arbitrarily tunable center frequency, according to one embodiment of the present invention;
FIG. 8 is a flowchart of a low spurious higher order frequency multiplication method based on optical sideband injection locking according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The low spurious higher order frequency multiplication system and method based on optical sideband injection locking according to the embodiment of the invention is described below with reference to the accompanying drawings.
The invention utilizes injection locking of the optical sideband to filter stray components which are aliased with the target signal in both frequency domain and time domain. Based on the above, the invention provides the ultra-high-order low-stray photon frequency doubling system, which effectively solves the problems of large stray interference and insufficient frequency doubling order of the traditional photon frequency doubling technology through the connection of various electronic structures and the injection locking of the sideband. As shown in fig. 2.
Fig. 1 is a schematic structural diagram of a low spurious higher-order frequency multiplication system based on optical sideband injection locking according to an embodiment of the present invention.
As shown in fig. 1, the system 10 includes:
a waveform generator 100, a high-order optical sideband generation module 200, an optical filter 300, an optical frequency shift module 400, a DFB laser 501 and a DFB laser 502, a coupler 600 and a photodetector 700.
And the waveform generator 100 is used for outputting a narrow-band baseband chirp and entering the high-order optical sideband generation module. The high-order optical sideband generation module 200 is connected to the optical filter 300, and is configured to generate a plurality of optical sidebands through the high-order optical sideband generation module 200, and filter the plurality of optical sidebands from the frequency domain through the optical filter 300 to obtain two target optical sidebands, respectively. One end of an output port of the optical filter 300 is connected to the optical frequency shift module 400, and is configured to perform frequency shift operation on a target optical sideband, an output of the optical frequency shift module 400 is injected into one DFB laser 501 through one circulator, and the other end of the output port of the optical filter 300 is configured to inject another target optical sideband into another DFB laser 502 through one circulator, so as to obtain an injection locking result, and the injection locking result is input into the coupler 600 together; the output optical signal frequency of the DFB laser subjected to injection locking is kept consistent with the two injected target optical sideband frequencies, and unlocked stray components are suppressed; the DFB laser is driven by two sawtooth-shaped currents, so that the frequency difference between the free-running output frequency of the DFB laser and a target optical sideband is smaller than the injection locking range of the DFB laser; the coupler 600 is connected to the photodetector 700, and is configured to couple an output of the injection-locked DFB laser and input the coupled output into the photodetector 700; and the photoelectric detector 700 is used for outputting beat frequency in the photoelectric detector 700 to obtain a high-order frequency doubling signal.
Further, in an embodiment of the present invention, the requirement of the injection locking DFB laser on the optical power of the injected optical signal is not high, and locking can be implemented for a very weak high-order optical sideband.
Further, in an embodiment of the present invention, by adjusting the frequency of the local oscillator signal driving the optical frequency shift module 400, arbitrary tuning of the center frequency of the frequency doubling signal can also be achieved.
Further, in an embodiment of the present invention, the high-order optical sideband generation module 200 can be implemented by cascading a phase modulator and an intensity modulator.
Further, in an embodiment of the present invention, the DFB output power is much larger than the injected light power, which can greatly improve the power and signal-to-noise ratio of the injected light sideband.
According to the low-stray high-order secondary frequency multiplication system based on optical sideband injection locking, disclosed by the embodiment of the invention, a plurality of optical sidebands are generated through a high-order optical sideband module by outputting narrow-band baseband linear frequency modulation waves, and two target optical sidebands are respectively filtered out from a frequency domain; one end of an output port of the optical filter is connected with the optical frequency shift module, frequency shift operation is carried out on one target optical sideband, the output of the optical frequency shift module is injected into one DFB laser through one circulator, the other end of the output port of the optical filter is used for injecting the other target optical sideband into the other DFB laser through the one circulator to obtain an injection locking result, the injection locking result is jointly input into the coupler, the output of the injection locking DFB laser is input into the photoelectric detector after being coupled, and a beat frequency is output in the photoelectric detector to obtain a high-order frequency doubling signal. The invention effectively solves the problems of large stray interference and insufficient frequency doubling order of the traditional photon frequency doubling technology by injecting and locking the sideband.
The low spurious higher order frequency multiplication system based on optical sideband injection locking of the invention is described in detail by specific embodiments.
Example one
In this embodiment, the higher order frequency multiplication system based on optical sideband injection locking includes:
the specific structure is shown in fig. 3, and comprises: the device comprises a single-wavelength light source, two microwave amplifiers, a microwave phase shifter, a directional coupler, a spectrum shaper, two circulators, two Mach-Zehnder modulators, a phase modulator, an optical coupler, an arbitrary waveform generator, a two-channel function signal generator, two DFB laser controllers and a photoelectric detector. The narrow-band linear frequency modulation signal is generated by an arbitrary waveform generator, is amplified by a microwave amplifier and is divided into two paths by a directional coupler, the power ratio of the two paths is 9:1, wherein one path with higher power is modulated on a Mach-Zehnder modulator (MZM), and the other path is modulated on a phase modulator connected behind the MZM after phase shifting and amplifying by a microwave phase shifter. The structure of the entire cascaded modulator is such as to produce a series of high order optical sidebands. Then, two positive and negative high-order optical sidebands are filtered out by a 1-in 2-out optical spectrum shaper, wherein one optical sideband passes through an MZM, the MZM is subjected to carrier suppression modulation by a single-frequency local oscillation signal to serve as an optical frequency shift module in the graph 2, then the optical frequency shift module passes through a circulator and is injected into a DFB laser I, and the polarization direction of injected light is controlled by a polarization controller. The other sideband is directly injected into the other DFB laser II through a circulator, and the polarization direction of the injection is controlled by the other polarization controller. The two DFB lasers are respectively controlled by two laser controllers to regulate the injection current and stabilize the working temperature of the DFB. A two-channel function signal generator outputs two triangular signals with positive and negative slopes to the two laser controllers, and the working temperature of the lasers is adjusted, so that the difference between the free-running frequency of the two DFB lasers and the injected optical sideband frequency is smaller than the injection locking range of the DFB lasers. After injection locking of the two DFB lasers, the frequency and the phase of an output optical signal are consistent with the injected optical sideband, the two DFB lasers are combined by an optical coupler and then input into a photoelectric detector, and the output of the detector is a frequency doubling signal.
Further, in one embodiment of the present invention, the difference between the frequency of the injection optical sideband and the output of the DFB laser in a free-running state is less than the range of injection locking of the DFB laser.
Further, in one embodiment of the present invention, the operational frequency range of the amplifier, coupler, phase shifter and modulator in the high-order optical sideband generation module should cover the frequency range of the input baseband signal.
Further, in one embodiment of the present invention, the bandwidth of the photodetector should be greater than the highest frequency of the multiplied signal.
Example two
The embodiment of the invention can realize the low stray high-order photon frequency doubling system by the following steps:
1) to convert baseband signals
And the single-frequency light is loaded on the single-frequency light through a high-order optical sideband generation module. Wherein f is0And k is the initial frequency and chirp rate of the baseband signal, respectively, with a bandwidth of B0. The expression of the generated ith order optical sideband signal is as follows:
wherein omega0Is the angular frequency of the output of a single wavelength light source in the system.
2) And adjusting the amplitude response of the frequency spectrum shaper, filtering the optical sidebands of the target to two output channels, and setting the orders of the two optical sidebands of the target to be N and-M respectively. The corresponding signal expression is:
and
3) one of the sidebands EN(t) passing through a MZM modulator biased at a minimum power transmission point and suppressing carrier modulation, the MZM modulator being modulated by a local oscillator signal having a frequency fLO. Considering only the first-order sideband, the optical signal output by the MZM is
Injecting a signal output by the MZM into a DFB laser through an optical circulator, adjusting the working temperature of the DFB laser, so that the DFB laser is injection-locked with one sideband of MZM output, for example, a positive sideband, and the output of the DFB laser is
4) And the other channel output of the optical filter is directly injected into the other DFB laser through the optical circulator, and the working temperature of the laser is adjusted, so that the DFB laser and the injected optical sideband are injected and locked. The output of the DFB laser is expressed as
5) The outputs of the two DFB lasers are combined into one path through an optical coupler and are introduced into a photoelectric detector, and the photocurrent output by the photoelectric detector is a frequency-doubled signal with tunable central frequency:
in this embodiment, photon frequency doubling experiments of different orders were performed using the above system.
The method comprises the following specific steps: the baseband signal is a narrowband linear frequency modulation signal, the initial frequency is 2GHz, the bandwidth is 1GHz, the frequency range is 2 GHz-3 GHz, the repetition period is 500Hz, and the duty ratio is 50%. The baseband signal is modulated by a cascade modulator to generate a series of optical sidebands. Fig. 4 shows the resulting spectrum (for clarity of illustration, the incoming baseband signal is a single frequency signal of 3GHz due to limited spectrometer resolution), and it can be seen that optical sidebands exceeding the ± 17 th order are produced.
Fig. 5 is a frequency spectrum diagram and time-frequency curve of a low-order frequency-multiplied signal generated by using the system. Setting the frequency shift quantity of the optical frequency shift module to be 0, and respectively carrying out injection locking of +/-1 order sidebands to generate 2 frequency multiplication signals; injection locking of + 1 order and-2 sidebands generates 3 frequency-doubled signals; injection locking of the + 2 order sidebands, respectively, generates a 4-fold frequency signal. The frequency ranges are respectively 4-6 GHz, 6-9 GHz and 8-12 GHz. Some of the interference at low frequencies within the signal bandwidth shown in the spectrogram is due to the mutual beat frequency of the DFB free-running when no lock is injected during a cycle, and can be eliminated by microwave switching. Because the bandwidth of the oscilloscope is limited, higher-order frequency multiplication signals cannot be acquired by the oscilloscope.
Fig. 6 shows a spectrum diagram of a 10-fold frequency signal generated by injection locking of + 5 order sidebands. Due to the limitation of the measurement bandwidth of the frequency spectrograph, higher-order frequency multiplication cannot be collected by the frequency spectrograph. But by observing the spectral pattern generated by the optical sideband generation module, the system has the ability to achieve a frequency doubling of order 34. The frequency shift amount of the optical frequency shift module is respectively set to be 20GHz, 10GHz and 0GHz, injection locking is carried out on the +/-5-order optical sidebands, 10 frequency doubling signals of 0-10 GHz, 10 GHz-20 GHz and 20-30 GHz are obtained, and as shown in fig. 7, the capability of the system for arbitrarily tuning the central frequency of the generated frequency doubling signals is proved.
FIG. 8 is a flowchart of a low spurious higher order frequency multiplication method based on optical sideband injection locking according to an embodiment of the present invention.
As shown in fig. 8, the flow chart of the low spurious higher order frequency multiplication method based on optical sideband injection locking includes the following steps:
s1, outputting narrow-band baseband linear frequency modulation waves;
s2, generating a plurality of optical sidebands by passing the narrow-band baseband linear frequency modulation waves through a high-order optical sideband module, and filtering the plurality of optical sidebands from a frequency domain to obtain two target optical sidebands respectively;
s3, one end of the output port of the optical filter is connected with the optical frequency shift module, the frequency shift operation is carried out on a target optical sideband, the output of the optical frequency shift module is injected into one DFB laser through one circulator, and the other end of the output port of the optical filter is used for injecting the other target optical sideband into the other DFB laser through one circulator to obtain an injection locking result and inputting the injection locking result into the coupler together; the output optical signal frequency of the DFB laser subjected to injection locking is kept consistent with the two injected target optical sideband frequencies, and unlocked stray components are suppressed; the DFB laser is driven by two sawtooth-shaped currents, so that the frequency difference between the free-running output frequency of the DFB laser and a target optical sideband is smaller than the injection locking range of the DFB laser;
s4, coupling the output of the injection locking DFB laser and inputting the coupled output into a photodetector;
and S5, outputting beat frequency in the photoelectric detector to obtain a high-order frequency doubling signal.
Further, in an embodiment of the present invention, the method further includes: and locking weak high-order optical sidebands.
Further, in one embodiment of the present invention, the output power of the DFB laser is greater than the power injected into the target optical sideband to boost the power and signal-to-noise ratio injected into the target optical sideband.
Further, in an embodiment of the present invention, the method further includes: the high-order optical sideband generation module is realized by cascading a phase modulator and an intensity modulator.
Further, in an embodiment of the present invention, the method further includes: and the central frequency of the frequency doubling signal is randomly tuned by adjusting the frequency of the local oscillator signal driving the optical frequency shift module.
According to the low stray high-order frequency multiplication method based on optical sideband injection locking, disclosed by the embodiment of the invention, narrow-band baseband linear frequency modulation waves are output; generating a plurality of optical sidebands by passing narrow-band baseband linear frequency modulation waves through a high-order optical sideband module, and respectively filtering the plurality of optical sidebands from a frequency domain to obtain two target optical sidebands; one end of an output port of the optical filter is connected with the optical frequency shift module, frequency shift operation is carried out on a target optical sideband, the output of the optical frequency shift module is injected into one DFB laser through one circulator, and the other end of the output port of the optical filter is used for injecting the other target optical sideband into the other DFB laser through the other circulator so as to obtain an injection locking result and jointly input the injection locking result into the coupler; the output optical signal frequency of the DFB laser subjected to injection locking is kept consistent with the two injected target optical sideband frequencies, and unlocked stray components are suppressed; the DFB laser is driven by two sawtooth-shaped currents, so that the frequency difference between the free-running output frequency of the DFB laser and a target optical sideband is smaller than the injection locking range of the DFB laser; coupling the output of the injection locked DFB laser and inputting the coupled output into a photoelectric detector; and outputting beat frequency in the photoelectric detector to obtain a high-order frequency doubling signal. The invention effectively solves the problems of large stray interference and insufficient frequency doubling order of the traditional photon frequency doubling technology by injecting and locking the sideband.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A low spurious higher order frequency multiplication system based on optical sideband injection locking, comprising:
the waveform generator is used for outputting narrow-band baseband linear frequency modulation waves and entering the high-order optical sideband generation module;
the high-order optical sideband generation module is connected with the optical filter and used for generating a plurality of optical sidebands through the high-order optical sideband generation module and filtering the plurality of optical sidebands into two target optical sidebands from a frequency domain through the optical filter;
one end of an output port of the optical filter is connected with the optical frequency shift module and is used for carrying out frequency shift operation on a target optical sideband, the output of the optical frequency shift module is injected into one DFB laser through one circulator, and the other end of the output port of the optical filter is used for injecting the other target optical sideband into the other DFB laser through the other circulator so as to obtain an injection locking result and inputting the injection locking result into the coupler together; wherein the output optical signal frequency of the injection-locked DFB laser is consistent with the injected two target optical sideband frequencies, and unlocked spurious components are suppressed; the DFB laser is driven by two sawtooth-shaped currents, so that the frequency difference between the free-running output frequency of the DFB laser and the target optical sideband is smaller than the injection locking range of the DFB laser;
the coupler is connected with the photoelectric detector and is used for coupling the output of the injection locked DFB laser and inputting the coupled output into the photoelectric detector;
and the photoelectric detector is used for outputting beat frequency in the photoelectric detector to obtain a high-order frequency doubling signal.
2. The optical sideband injection locked low spurious higher order frequency doubling system of claim 1 wherein the DFB laser is injection locked to the target optical sideband and is also used to lock to weak higher order optical sidebands.
3. The optical sideband injection locking based low spurious higher order frequency doubling system of claim 1, wherein the output power of the DFB laser is greater than the target optical sideband power to boost the power and signal-to-noise ratio of the injected target optical sideband.
4. The optical sideband injection locking based low spurious higher order frequency multiplication system of claim 1, wherein the higher order optical sideband generation module is implemented by cascading a phase modulator and an intensity modulator.
5. The optical sideband injection locked low spurious higher order frequency doubling system of claim 1 further comprising:
and the optical frequency shift module is used for randomly tuning the center frequency of the frequency doubling signal by adjusting the frequency of the local oscillator signal driving the optical frequency shift module.
6. A low spurious higher order frequency multiplication method based on optical sideband injection locking, characterized in that, the method is adopted by the system of any one of claims 1-5, and comprises:
outputting narrow-band baseband linear frequency modulation waves;
generating a plurality of optical sidebands by passing the narrow-band baseband linear frequency modulation waves through a high-order optical sideband module, and filtering the plurality of optical sidebands out two target optical sidebands from a frequency domain respectively;
one end of an output port of the optical filter is connected with the optical frequency shift module, frequency shift operation is carried out on a target optical sideband, the output of the optical frequency shift module is injected into one DFB laser through one circulator, and the other end of the output port of the optical filter is used for injecting the other target optical sideband into the other DFB laser through the other circulator so as to obtain an injection locking result and inputting the injection locking result into the coupler together; wherein the output optical signal frequency of the injection-locked DFB laser is consistent with the injected two target optical sideband frequencies, and unlocked spurious components are suppressed; the DFB laser is driven by two sawtooth-shaped currents, so that the frequency difference between the free-running output frequency of the DFB laser and the target optical sideband is smaller than the injection locking range of the DFB laser;
coupling the output of the injection locked DFB laser and inputting the coupled output into a photoelectric detector;
and outputting beat frequency in the photoelectric detector to obtain a high-order frequency doubling signal.
7. The optical sideband injection locked low spurious higher order frequency multiplication method of claim 6, further comprising: and locking weak high-order optical sidebands.
8. The optical sideband injection locking based low spurious higher order frequency doubling method of claim 6, wherein the output power of the DFB laser is larger than the injected target optical sideband power to improve the power and signal-to-noise ratio of the injected target optical sideband.
9. The optical sideband injection locked low spurious higher order frequency multiplication method of claim 6, further comprising: by cascading a phase modulator and an intensity modulator.
10. The optical sideband injection locked low spurious higher order frequency multiplication method of claim 6, further comprising:
and randomly tuning the central frequency of the frequency doubling signal by adjusting the frequency of the local oscillator signal driving the optical frequency shift module.
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