Light-assisted broadband frequency hopping signal channelization receiving device and method

Abstract

The invention relates to a light-assisted broadband frequency hopping signal channelization receiving device and a light-assisted broadband frequency hopping signal channelization receiving method, which combine a photon channelization technology, an image rejection receiving technology and a frequency hopping signal receiving technology, break through the existing electronic bottleneck, realize six-channel channelization receiving of broadband frequency hopping signals, greatly simplify the structure and improve the receiving efficiency. And the requirement of the rear end of the receiver on the high-speed ADC is reduced.

Description

Technical Field

[0001] The present application relates to the field of microwave photonic anti-interference communications, and in particular, to an optically assisted broadband frequency-hopping signal channelization receiving device and method. Background Art

[0002] As a typical open system, satellite communication system is susceptible to various interferences. Therefore, it is very important to improve the stability and anti-interference ability of communication system when meeting the communication requirements of large capacity and high data rate. Since frequency hopping spectrum technology has the advantages of anti-fading, anti-interference and low interception performance, the satellite broadband frequency hopping system using high-speed frequency hopping technology has alleviated the threat of electronic interference to communication links to a certain extent.

[0003] In an increasingly complex electromagnetic environment, the capabilities of jamming and monitoring equipment are constantly improving. Traditional frequency hopping technology is gradually weakening its ability to counter jamming. The next generation of anti-jamming satellite communication systems is moving towards wider bandwidth and faster frequency hopping. However, these systems have technical barriers in terms of frequency hopping bandwidth and rate. These limitations may affect data transmission speed, reduce communication efficiency, and may endanger signal security. For example, if the hopping rate is insufficient, sophisticated eavesdropping equipment may be able to predict or track frequency changes, posing a threat to communication security. Similarly, limited bandwidth may result in a narrow frequency range, increasing the possibility of system congestion and interference.

[0004] Traditional frequency hopping communication systems achieve frequency hopping and demodulation by using fast frequency synthesizers and mixers. In traditional frequency hopping signal generation, the source information is first modulated onto a carrier and mixed with a local oscillator to generate an FSK or BPSK signal. The local oscillator signal is generated by a frequency synthesizer controlled by a frequency hopping pseudo-random spread spectrum code. In the traditional frequency hopping signal reception process, the received frequency hopping signal is down-converted by a frequency hopping local oscillator and then digitally demodulated to obtain the destination information. Although the frequency hopping bandwidth can be extended by expanding the frequency hopping oscillator using frequency multiplication technology, high-order multiplication will significantly increase the phase noise of the system and reduce communication efficiency. Therefore, in traditional frequency hopping signal generation and reception technology, the fast frequency hopping local signal source within the ultra-wideband range is a limiting factor for frequency hopping communication systems. Summary of the invention

[0005] In order to overcome at least one deficiency in the prior art, the present application provides an optically assisted broadband frequency hopping signal channelized receiving device and method.

[0006] In a first aspect, a light-assisted broadband frequency-hopping signal channelization receiving device is provided, comprising: a laser, a first optical splitter, a first Magneto-amplifier modulator, a second Magneto-amplifier modulator, an optical amplifier, a second optical splitter, a third optical splitter, a first filter, a first wavelength division multiplexer, a second filter, an acousto-optic modulator, a second wavelength division multiplexer, a first coherent receiver, a second coherent receiver, a third coherent receiver, a first 90° bridge, a second 90° bridge, and a third 90° bridge;

[0007] The laser generates an optical carrier, which is divided into two optical signals by a first optical splitter, which are recorded as a first optical signal and a second optical signal;

[0008] The first optical signal is input into the first Maxim modulator to modulate the broadband frequency hopping signal to obtain a first modulated optical signal; the first modulated optical signal is divided into two optical signals by the second optical splitter, which are recorded as a third optical signal and a fourth optical signal; the third optical signal is input into the first filter for filtering to obtain a first filtered signal; the fourth optical signal is input into the first wavelength division multiplexer for upper and lower sideband separation to obtain a first upper sideband signal and a first lower sideband signal;

[0009] The second optical signal is input into the second Magneto-Gain modulator to modulate the local oscillator signal to obtain a second modulated optical signal; the second modulated optical signal is divided into two optical signals by the third optical splitter, which are recorded as a fifth optical signal and a sixth optical signal; the fifth optical signal is input into the second filter for filtering to obtain a second filtered signal; the sixth optical signal is input into the acousto-optic modulator to modulate the frequency-shifted signal to obtain a third modulated signal, and the third modulated signal is input into the second wavelength division multiplexer to separate the upper and lower sidebands to obtain a second upper sideband signal and a second lower sideband signal;

[0010] The first filtered signal and the second filtered signal are input into a first coherent receiver for coupling and down-conversion to obtain a first detection signal, and the first detection signal is input into a first 90° bridge for image suppression reception to obtain a first detection signal after image suppression reception;

[0011] The first upper sideband signal and the second upper sideband signal are input into a second coherent receiver for coupling and down-conversion to obtain a second detection signal, and the second detection signal is input into a second 90° bridge for image suppression reception to obtain a second detection signal after image suppression reception;

[0012] The first lower sideband signal and the second lower sideband signal are input into the third coherent receiver for coupling and down-conversion to obtain a third detection signal. The third detection signal is input into the third 90° bridge for image suppression reception to obtain a third detection signal after image suppression reception.

[0013] In one embodiment, the first optical signal is input to a first MPa modulator to modulate the broadband frequency hopping signal to obtain a first modulated optical signal, which is expressed by the following formula:

[0014]

[0015] Among them, E MZM (t) is the optical signal after the first modulation, E0 is the amplitude of the optical carrier, f c is the center frequency of the optical carrier, t is the time, J1(m RF ) is the Bessel function of the first kind, m RF is the modulation index of the first MPa modulator, f RF is the frequency of the broadband frequency hopping signal.

[0016] In one embodiment, the third optical signal is input into the first filter for filtering to obtain a first filtered signal, which is expressed by the following formula:

[0017]

[0018] Among them, E 滤波1 (t) is the signal after the first filtering, E0 is the amplitude of the optical carrier, f c is the center frequency of the optical carrier, t is the time, J1(m RF ) is the Bessel function of the first kind, m RF is the modulation index of the first MPa modulator, f RF is the frequency of the broadband frequency hopping signal.

[0019] In one embodiment, the fourth optical signal is input to the first wavelength division multiplexer to separate the upper and lower sidebands to obtain a first upper sideband signal and a first lower sideband signal, which are expressed by the following formula:

[0020]

[0021] Among them, E 上边带1 (t) is the first upper sideband signal, t is time, α DWDM is the insertion loss of the first wavelength division multiplexer, E0 is the amplitude of the optical carrier, f c is the center frequency of the optical carrier, J1(m RF ) is the Bessel function of the first kind, m RF is the modulation index of the first MPa modulator, f RF is the frequency of the broadband frequency hopping signal; E 下边带1 (t) is the first lower sideband signal.

[0022] In one embodiment, the second optical signal is input to a second MA modulator to modulate the local oscillator signal to obtain a second modulated optical signal, which is expressed by the following formula:

[0023]

[0024] in, is the optical signal after the second modulation, E0 is the amplitude of the optical carrier, f c is the center frequency of the optical carrier, t is the time, J1(m Lo ) is the Bessel function of the first kind, m Lo is the modulation index of the second MPa modulator, f Lo is the frequency of the local oscillator signal.

[0025] In one embodiment, the sixth optical signal is input to an acousto-optic modulator to modulate the frequency-shifted signal to obtain a third modulated signal, which is expressed by the following formula:

[0026]

[0027] Among them, E′ MZM (t) is the signal after the third modulation, t is time, E0 is the amplitude of the optical carrier, f c is the center frequency of the optical carrier, J1(m Lo ) is the Bessel function of the first kind, m Lo is the modulation index of the second MPa modulator, f Lo is the frequency of the local oscillator signal, f s is the frequency of the frequency-shifted signal.

[0028] In one embodiment, the first coherent receiver includes a first 90° optical coupler, a first balanced detector and a second balanced detector; the first 90° optical coupler couples the first filtered signal and the second filtered signal to obtain four coupled signals; the first balanced detector and the second balanced detector output a first detection signal according to the four coupled signals;

[0029] The second coherent receiver includes a second 90° optical coupler, a third balanced detector and a fourth balanced detector; the second 90° optical coupler couples the first upper sideband signal and the second upper sideband signal to obtain four coupled signals; the third balanced detector and the fourth balanced detector output a second detection signal according to the four coupled signals;

[0030] The third coherent receiver includes a third 90° optical coupler, a fifth balanced detector and a sixth balanced detector; the third 90° optical coupler couples the first lower sideband signal and the second lower sideband signal to obtain four coupled signals; the fifth balanced detector and the sixth balanced detector output a third detection signal based on the four coupled signals.

[0031] In one embodiment, the four coupled signals output by the first 90° optical coupler are E I11(t), E I11 (t), E Q11 (t), E Q11 (t);

[0032] E I11 (t) = E 滤波1 (t)+E 滤波2 (t)

[0033] E I12 (t) = E 滤波1 (t)-E 滤波2 (t)

[0034]

[0035] Among them, E 滤波1 (t) is the signal after the first filtering, E 滤波2 (t) is the signal after the second filtering.

[0036] In one embodiment, the first detection signal is I I1 (t), I Q1 (t);

[0037] I I1 (t)∝|E I11 (t)| 2 -|E I12 (t)| 2

[0038] I Q1 (t)∝|E Q11 (t)| 2 -|E Q12 (t)| 2

[0039] Among them, E I11 (t), E I12 (t), E W11 (t), E Q12 (t) are the four coupled signals output by the first 90° optical coupler.

[0040] In a second aspect, a method for optically assisted broadband frequency modulation signal channelization reception is provided, comprising:

[0041] generating an optical carrier and dividing the optical carrier into two optical signals, which are recorded as a first optical signal and a second optical signal;

[0042] Modulating the broadband frequency hopping signal based on the first optical signal to obtain a first modulated optical signal; dividing the first modulated optical signal into two optical signals, recorded as a third optical signal and a fourth optical signal; filtering the third optical signal to obtain a first filtered signal; performing upper and lower sideband separation on the fourth optical signal to obtain a first upper sideband signal and a first lower sideband signal;

[0043] Modulating the local oscillator signal based on the second optical signal to obtain a second modulated optical signal; dividing the second modulated optical signal into two optical signals, recorded as a fifth optical signal and a sixth optical signal; filtering the fifth optical signal to obtain a second filtered signal; modulating the frequency-shifted signal based on the sixth optical signal to obtain a third modulated signal; performing upper and lower sideband separation on the third modulated signal to obtain a second upper sideband signal and a second lower sideband signal;

[0044] The first filtered signal and the second filtered signal are coupled and down-converted to obtain a first detection signal; the first detection signal is image-suppressed received to obtain a first image-suppressed received detection signal;

[0045] The first upper sideband signal and the second upper sideband signal are coupled and down-converted to obtain a second detection signal; the second detection signal is image-suppressed received to obtain a second detection signal after image-suppressed reception;

[0046] The first lower sideband signal and the second lower sideband signal are coupled and down-converted to obtain a third detection signal; the third detection signal is image-suppressed received to obtain a third detection signal after image-suppressed reception.

[0047] Compared with the prior art, the present application has the following beneficial effects: the optically assisted broadband frequency-hopping signal channelized receiving device and method of the present application combines photon channelization technology, image suppression reception and frequency-hopping signal receiving technology, breaks through the existing electronic bottleneck, and realizes six-channel channelized reception of broadband frequency-hopping signals, which greatly simplifies the structure and reduces the demand for high-speed ADC at the back end of the receiver. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The present application may be better understood by referring to the following description given in conjunction with the accompanying drawings, which together with the following detailed description are included in this specification and form a part of this specification. In the drawings:

[0049] Figure 1 The structure block diagram of the optically assisted broadband frequency hopping signal channelization receiving device is shown;

[0050] Figure 2 Spectra of the coherent receiver output signal are shown; wherein (a) to (f) are spectra of the output signals of channels 1 to 6, respectively;

[0051] Figure 3 The time-frequency diagram of the coherent receiver output signal is shown, where (a) is the time-frequency diagram of the frequency hopping signal, and (b) to (g) are the time-frequency diagrams of the output signals of channel 1 to channel 6, respectively. DETAILED DESCRIPTION

[0052] The exemplary embodiments of the present application will be described below in conjunction with the accompanying drawings. For the sake of clarity and conciseness, not all features of the actual embodiments are described in the specification. However, it should be understood that many implementation-specific decisions can be made in the process of developing any such actual embodiments in order to achieve the specific goals of the developer, and these decisions may vary from embodiment to embodiment.

[0053] It is also necessary to explain here that, in order to avoid obscuring the present application due to unnecessary details, only the device structure closely related to the scheme according to the present application is shown in the drawings, while other details that are not closely related to the present application are omitted.

[0054] It should be understood that the present application is not limited to the described implementation forms due to the following description with reference to the accompanying drawings. In this article, where feasible, the embodiments can be combined with each other, features between different embodiments can be replaced or borrowed, and one or more features can be omitted in one embodiment.

[0055] The embodiment of the present application provides an optically assisted broadband frequency hopping signal channelization receiving device, which uses two Mach-Zehnder Modulators (MZM) to perform spectrum replication on the local oscillator signal and the broadband frequency hopping signal. An acousto-optic modulator (AOM) is used to perform local oscillator optical frequency shift and channel selection, and a wavelength division multiplexer (Dense Wavelength Division Multiplexer, DWDM) and a filter are used to select different frequency bands, and finally the down-conversion and channel division of the ultra-wideband frequency hopping signal are realized through a coherent receiver.

[0056] Figure 1 The structure block diagram of the optically assisted broadband frequency hopping signal channelization receiving device is shown in FIG. Figure 1The optically assisted broadband frequency hopping signal channelization receiving device includes: a laser, a first optical splitter, a first Magneto-amplifier modulator, a second Magneto-amplifier modulator, an optical amplifier, a second optical splitter, a third optical splitter, a first filter, a first wavelength division multiplexer, a second filter, an acousto-optic modulator, a second wavelength division multiplexer, a first coherent receiver, a second coherent receiver, a third coherent receiver, a first 90° bridge, a second 90° bridge and a third 90° bridge. Here, the first filter and the second filter are optical band pass filters (OBPF).

[0057] The specific functions of each component are introduced in detail below.

[0058] The laser generates an optical carrier, which can be expressed as E in (t) = E0exp(j2πf c ), E0 is the amplitude of the optical carrier, f c is the center frequency of the optical carrier, which is divided into two optical signals by the first optical splitter, denoted as the first optical signal and the second optical signal;

[0059] The first optical signal is input to the first MAG modulator to modulate the broadband frequency hopping signal to obtain a first modulated optical signal. The broadband frequency hopping signal is represented by V RF cos(2πf RF t), f RF is the frequency of the broadband frequency hopping signal, V RF is the amplitude of the broadband frequency hopping signal; specifically, the optical signal after the first modulation is expressed by the following formula:

[0060]

[0061] Among them, E MZM (t) is the optical signal after the first modulation, E0 is the amplitude of the optical carrier, f c is the center frequency of the optical carrier, t is the time, J1(m RF ) is the Bessel function of the first kind, m RF is the modulation index of the first MPa modulator, f RF is the frequency of the broadband frequency hopping signal.

[0062] The first modulated optical signal E MZM (t) is divided into two optical signals by the second optical splitter, which are recorded as the third optical signal and the fourth optical signal; the third optical signal is input into the first filter for filtering to obtain a first filtered signal; it is expressed by the following formula:

[0063]

[0064] Among them, E 滤波1(t) is the signal after the first filtering, E0 is the amplitude of the optical carrier, f c is the center frequency of the optical carrier, t is the time, J1(m RF ) is the Bessel function of the first kind, m RF is the modulation index of the first MPa modulator, f RF is the frequency of the broadband frequency hopping signal.

[0065] The fourth optical signal is input to the first wavelength division multiplexer for upper and lower sideband separation to obtain a first upper sideband signal and a first lower sideband signal; the fourth optical signal is expressed by the following formula:

[0066]

[0067] Among them, E 上边带1 (t) is the first upper sideband signal, t is time, α DWDM is the insertion loss of the first wavelength division multiplexer, E0 is the amplitude of the optical carrier, f c is the center frequency of the optical carrier, J1(m RF ) is the Bessel function of the first kind, m RF is the modulation index of the first MPa modulator, f RF is the frequency of the broadband frequency hopping signal; E 下边带1 (t) is the first lower sideband signal.

[0068] The second optical signal is input to the second MA modulator to modulate the local oscillator signal to obtain a second modulated optical signal; the local oscillator signal can be expressed as V Lo cos(2πf Lo t), V Lo is the amplitude of the local oscillator signal, f Lo is the frequency of the local oscillator signal. The optical signal after the second modulation can be expressed by the following formula:

[0069]

[0070] in, is the optical signal after the second modulation, E0 is the amplitude of the optical carrier, f c is the center frequency of the optical carrier, t is the time, J1(m Lo ) is the Bessel function of the first kind, m Lo is the modulation index of the second MPa modulator, f Lo is the frequency of the local oscillator signal.

[0071] The second modulated optical signal is split into two optical signals by the third optical splitter, which are recorded as the fifth optical signal and the sixth optical signal. The fifth optical signal is input to the second filter for filtering to obtain the second filtered signal E. 滤波2(t); The sixth optical signal is input to the acousto-optic modulator, which modulates the frequency-shifted signal to obtain a third modulated signal; the frequency-shifted signal can be expressed as V s cos(2πf s t), V s is the amplitude of the frequency-shifted signal, f s is the frequency of the frequency-shifted signal. The third modulated signal is expressed by the following formula:

[0072]

[0073] Among them, E′ MZM (t) is the signal after the third modulation, t is time, E0 is the amplitude of the optical carrier, f c is the center frequency of the optical carrier, J1(m Lo ) is the Bessel function of the first kind, m Lo is the modulation index of the second MPa modulator, f Lo is the frequency of the local oscillator signal, f s is the frequency of the frequency-shifted signal.

[0074] The third modulated signal is input to the second wavelength division multiplexer to separate the upper and lower sidebands to obtain the second upper sideband signal E 上边带2 (t) and the second lower sideband signal E 下边带2 (t);

[0075] The first filtered signal and the second filtered signal are input into a first coherent receiver for coupling and down-conversion to obtain a first detection signal, and the first detection signal is input into a first 90° bridge for image suppression reception to obtain a first detection signal after image suppression reception;

[0076] The first upper sideband signal and the second upper sideband signal are input into a second coherent receiver for coupling and down-conversion to obtain a second detection signal, and the second detection signal is input into a second 90° bridge for image suppression reception to obtain a second detection signal after image suppression reception;

[0077] The first lower sideband signal and the second lower sideband signal are input into the third coherent receiver for coupling and down-conversion to obtain a third detection signal. The third detection signal is input into the third 90° bridge for image suppression reception to obtain a third detection signal after image suppression reception.

[0078] Specifically, the first coherent receiver includes a first 90° optical coupler, a first balanced detector BPD1 and a second balanced detector BPD2; the first 90° optical coupler couples the first filtered signal and the second filtered signal to obtain four coupled signals; the first balanced detector and the second balanced detector output a first detection signal according to the four coupled signals;

[0079] Here, the four coupled signals output by the first 90° optical coupler are E I11 (t), E I12 (t), E Q11 (t), E Q12 (t);

[0080] E I11 (t) = E 滤波1 (t)+E 滤波2 (T)

[0081] E I12 (T) = E 滤波1 (T)-E 滤波2 (T)

[0082]

[0083] Among them, E 滤波1 (t) is the signal after the first filtering, E 滤波2 (t) is the signal after the second filtering.

[0084] According to the calculation results, we can know that:

[0085]

[0086] in, and They represent light vector mode components in different polarization states respectively.

[0087] The first detection signal is I I1 (t), I Q1 (t);

[0088] I I1 (t)∝|E I11 (t)| 2 -|E I12 (t)| 2

[0089] I Q1 (t)∝|E Q11 (t)| 2 -|E Q12 (t)| 2

[0090] Among them, E I11 (t), E I12 (t), E Q11 (t), E Q12 (t) are the four coupled signals output by the first 90° optical coupler.

[0091] The second coherent receiver includes a second 90° optical coupler, a third balanced detector, and a fourth balanced detector BPD3 and BPD4; the second 90° optical coupler couples the first upper sideband signal and the second upper sideband signal to obtain four coupled signals; the third balanced detector and the fourth balanced detector output a second detection signal according to the four coupled signals;

[0092] The third coherent receiver includes a third 90° optical coupler, a fifth balanced detector BPD5 and a sixth balanced detector BPD6; the third 90° optical coupler couples the first lower sideband signal and the second lower sideband signal to obtain four coupled signals; the fifth balanced detector and the sixth balanced detector output a third detection signal based on the four coupled signals.

[0093] It should be noted that the internal processing of the second coherent receiver and the third coherent receiver is the same as that of the first coherent receiver, and only the input is different, and the specific processing process will not be repeated.

[0094] By analyzing the first detection signal, it can be seen that after frequency conversion, the frequency hopping signal is brought to the vicinity of the intermediate frequency (IF). However, at this point, the left and right parts of the signal spectrum are down-converted to the same intermediate frequency range, resulting in spectrum overlap. In these parts, the frequency hopping signals become mirror interferences of each other, making it impossible to distinguish the frequencies of the received hopping signals. Therefore, three 90° bridges are set to perform image suppression reception on the three detection signals respectively. After image suppression, the two mutually mirrored channels are effectively separated into two different channels, each of which can receive different frequency hopping signals.

[0095] This application makes full use of the broadband and reconfigurable characteristics of photonic technology to provide a new solution for broadband signal reception. In the optical field, the broadband frequency hopping signal is sliced ​​into multiple channels and then downconverted to the intermediate frequency. This method of receiving frequency hopping signals can significantly reduce the difficulty of frequency hopping decoding at the receiving end.

[0096] The embodiment of the present application also provides an optically assisted broadband frequency modulation signal channelized receiving method, comprising:

[0097] First, an optical carrier is generated, and the optical carrier is divided into two optical signals, which are recorded as a first optical signal and a second optical signal;

[0098] Then, based on the first optical signal, the broadband frequency hopping signal is modulated to obtain a first modulated optical signal; the first modulated optical signal is divided into two optical signals, which are recorded as a third optical signal and a fourth optical signal; the third optical signal is filtered to obtain a first filtered signal; the fourth optical signal is separated into upper and lower sidebands to obtain a first upper sideband signal and a first lower sideband signal;

[0099] Then, the local oscillator signal is modulated based on the second optical signal to obtain a second modulated optical signal; the second modulated optical signal is divided into two optical signals, which are recorded as a fifth optical signal and a sixth optical signal; the fifth optical signal is filtered to obtain a second filtered signal; the frequency-shifted signal is modulated based on the sixth optical signal to obtain a third modulated signal; the third modulated signal is separated into upper and lower sidebands to obtain a second upper sideband signal and a second lower sideband signal;

[0100] Then, the first filtered signal and the second filtered signal are coupled and down-converted to obtain a first detection signal; the first detection signal is image-suppressed received to obtain a first detection signal after image-suppressed reception;

[0101] Then, the first upper sideband signal and the second upper sideband signal are coupled and down-converted to obtain a second detection signal; the second detection signal is image-suppressed received to obtain a second detection signal after image-suppressed reception;

[0102] Then, the first lower sideband signal and the second lower sideband signal are coupled and down-converted to obtain a third detection signal; and the third detection signal is image-suppressed received to obtain a third detection signal after image-suppressed reception.

[0103] The specific implementation process of each step in this embodiment can be found in the aforementioned embodiment part, and its technical effect corresponds to the technical effect of the above method, which will not be repeated here.

[0104] A specific embodiment is provided below. The wavelength of the optical carrier generated by the laser source is selected to be 1550.12nm, and the optical power is 12dBm; the microwave signal source generates frequency hopping communication signals with frequencies of 14.1, 15.2, 16.3, 17.4, 18.5 and 19.6GHz, and a local oscillator radio frequency signal with a frequency of 17GHz and a power of 10dBm, respectively; the half-wave voltage of the modulator is 3.5V, and the extinction ratio is 32dB; the bandwidth of DWDM1 and 2 channels is 50GHz, and the crosstalk of adjacent channels is 32dB; the responsivity of the coherent receiver is 0.8A / W; Figure 2 The frequency spectrum of the coherent receiver output signal is shown, where (a) to (f) are the frequency spectrum of the output signals of channel 1 to channel 6 respectively.

[0105] The duration of the generated signal is 900 nanoseconds, and the signal switching time is 100 nanoseconds. The frequency jump points are 17.1, 17.9, 18.2, 18.8, 19.3, 19.7, 20.4, 20.6, 21.6, 21.4, 22.7 and 22.3 GHz, and the frequency span from 17 GHz to 23 GHz is 6 GHz. The local oscillator RF signal has a frequency of 20 GHz and a power of 10 dBm; Figure 3The time-frequency diagram of the coherent receiver output signal is shown, where (a) is the time-frequency diagram of the frequency hopping signal, and (b) to (g) are the time-frequency diagrams of the output signals of channel 1 to channel 6, respectively.

[0106] The optically assisted broadband frequency hopping signal receiving method of the present application is simple and easy to implement, has a large working bandwidth, and has high received signal quality.

[0107] The above are only various implementations of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An optically assisted broadband frequency hopping signal channelization receiving device, characterized in that: include: A laser, a first optical splitter, a first Magneto-sensing modulator, a second Magneto-sensing modulator, an optical amplifier, a second optical splitter, a third optical splitter, a first filter, a first wavelength division multiplexer, a second filter, an acousto-optic modulator, a second wavelength division multiplexer, a first coherent receiver, a second coherent receiver, a third coherent receiver, a first 90° bridge, a second 90° bridge, and a third 90° bridge; The laser generates an optical carrier, which is divided into two optical signals by the first optical splitter, which are recorded as a first optical signal and a second optical signal; The first optical signal is input into the first Maxim modulator to modulate the broadband frequency hopping signal to obtain a first modulated optical signal; the first modulated optical signal is divided into two optical signals by the second optical splitter, which are recorded as a third optical signal and a fourth optical signal; the third optical signal is input into the first filter for filtering to obtain a first filtered signal; the fourth optical signal is input into the first wavelength division multiplexer for upper and lower sideband separation to obtain a first upper sideband signal and a first lower sideband signal; The second optical signal is input into the second Magneto-Address modulator to modulate the local oscillator signal to obtain a second modulated optical signal; the second modulated optical signal is divided into two optical signals by the third optical splitter, which are recorded as a fifth optical signal and a sixth optical signal; the fifth optical signal is input into the second filter for filtering to obtain a second filtered signal; the sixth optical signal is input into the acousto-optic modulator to modulate the frequency-shifted signal to obtain a third modulated signal, and the third modulated signal is input into the second wavelength division multiplexer to separate the upper and lower sidebands to obtain a second upper sideband signal and a second lower sideband signal; The first filtered signal and the second filtered signal are input into the first coherent receiver for coupling and down-conversion to obtain a first detection signal, and the first detection signal is input into the first 90° bridge for image suppression reception to obtain a first image suppression received detection signal; The first upper sideband signal and the second upper sideband signal are input into the second coherent receiver for coupling and down-conversion to obtain a second detection signal, and the second detection signal is input into the second 90° bridge for image suppression reception to obtain a second detection signal after image suppression reception; The first lower sideband signal and the second lower sideband signal are input into the third coherent receiver for coupling and down-conversion to obtain a third detection signal, and the third detection signal is input into the third 90° bridge for image suppression reception to obtain a third detection signal after image suppression reception.

2. The device according to claim 1, characterized in that The first optical signal is input to the first MP modulator to modulate the broadband frequency hopping signal to obtain a first modulated optical signal, which is expressed by the following formula: Among them, E MZM (t) is the optical signal after the first modulation, E0 is the amplitude of the optical carrier, f c is the center frequency of the optical carrier, t is the time, J1(m RF ) is the Bessel function of the first kind, m RF is the modulation index of the first MPa modulator, f RF is the frequency of the broadband frequency hopping signal.

3. The device according to claim 1, characterized in that The third optical signal is input into the first filter for filtering to obtain a first filtered signal, which is expressed by the following formula: Where, Efilter1(t) is the signal after the first filtering, E0 is the amplitude of the optical carrier, and f c is the center frequency of the optical carrier, t is the time, J1(m RF ) is the Bessel function of the first kind, m RF is the modulation index of the first MPa modulator, f RF is the frequency of the broadband frequency hopping signal.

4. The device according to claim 1, characterized in that The fourth optical signal is input into the first wavelength division multiplexer to separate the upper and lower sidebands to obtain a first upper sideband signal and a first lower sideband signal, which are expressed by the following formula: Among them, E upper sideband 1(t) is the first upper sideband signal, t is time, α DWDM is the insertion loss of the first wavelength division multiplexer, E0 is the amplitude of the optical carrier, f c is the center frequency of the optical carrier, J1(m RF ) is the Bessel function of the first kind, m RF is the modulation index of the first MPa modulator, f RF is the frequency of the broadband frequency hopping signal; E lower sideband 1(t) is the first lower sideband signal.

5. The device according to claim 1, characterized in that The second optical signal is input to the second MA modulator to modulate the local oscillator signal to obtain a second modulated optical signal, which is expressed by the following formula: in, is the optical signal after the second modulation, E0 is the amplitude of the optical carrier, f c is the center frequency of the optical carrier, t is the time, J1(m Lo ) is the Bessel function of the first kind, m Lo is the modulation index of the second MPa modulator, f Lo is the frequency of the local oscillator signal.

6. The device according to claim 1, characterized in that The sixth optical signal is input to the acousto-optic modulator to modulate the frequency-shifted signal to obtain a third modulated signal, which is expressed by the following formula: Among them, E ′ MZM (t) is the signal after the third modulation, t is time, E0 is the amplitude of the optical carrier, f c is the center frequency of the optical carrier, J1(m Lo ) is the Bessel function of the first kind, m Lo is the modulation index of the second MPa modulator, f Lo is the frequency of the local oscillator signal, f s is the frequency of the frequency-shifted signal.

7. The device according to claim 1, characterized in that The first coherent receiver includes a first 90° optical coupler, a first balanced detector, and a second balanced detector; the first 90° optical coupler couples the first filtered signal and the second filtered signal to obtain four coupled signals; the first balanced detector and the second balanced detector output the first detection signal according to the four coupled signals; The second coherent receiver includes a second 90° optical coupler, a third balanced detector and a fourth balanced detector; the second 90° optical coupler couples the first upper sideband signal and the second upper sideband signal to obtain four coupled signals; the third balanced detector and the fourth balanced detector output the second detection signal according to the four coupled signals; The third coherent receiver includes a third 90° optical coupler, a fifth balanced detector and a sixth balanced detector; the third 90° optical coupler couples the first lower sideband signal and the second lower sideband signal to obtain four coupled signals; the fifth balanced detector and the sixth balanced detector output the third detection signal according to the four coupled signals.

8. The device according to claim 7, characterized in that The four coupled signals output by the first 90° optical coupler are E I11 (t), E I12 (t), E Q11 (t), E Q12 (t); E I11 (t) = E filter 1 (t) + E filter 2 (t) E I12 (t) = E filter 1 (t) - E filter 2 (t) Among them, E filtering 1 (t) is the signal after the first filtering, and E filtering 2 (t) is the signal after the second filtering.

9. The device according to claim 7, characterized in that The first detection signal is I I1 (t), I Q1 (t); I I1 (t)∝|E I11 (t)| 2 -|E I12 (t)| 2 I Q1 (t)∝|E Q11 (t)| 2 -|E Q12 (t)| 2 Among them, E I11 (t), E I12 (t), E Q11 (t), E Q12 (t) are the four coupled signals output by the first 90° optical coupler.

10. An optically assisted broadband frequency modulation signal channelized receiving method, characterized in that: include: generating an optical carrier, and dividing the optical carrier into two optical signals, recorded as a first optical signal and a second optical signal; Modulating the broadband frequency hopping signal based on the first optical signal to obtain a first modulated optical signal; dividing the first modulated optical signal into two optical signals, recorded as a third optical signal and a fourth optical signal; filtering the third optical signal to obtain a first filtered signal; Performing upper and lower sideband separation on the fourth optical signal to obtain a first upper sideband signal and a first lower sideband signal; Modulating the local oscillator signal based on the second optical signal to obtain a second modulated optical signal; dividing the second modulated optical signal into two optical signals, recorded as a fifth optical signal and a sixth optical signal; filtering the fifth optical signal to obtain a second filtered signal; Modulating the frequency-shifted signal based on the sixth optical signal to obtain a third modulated signal; performing upper and lower sideband separation on the third modulated signal to obtain a second upper sideband signal and a second lower sideband signal; coupling and down-converting the first filtered signal and the second filtered signal to obtain a first detection signal; Performing image suppression reception on the first detection signal to obtain a first detection signal after image suppression reception; coupling and down-converting the first upper sideband signal and the second upper sideband signal to obtain a second detection signal; Performing image suppression reception on the second detection signal to obtain a second detection signal after image suppression reception; coupling and down-converting the first lower sideband signal and the second lower sideband signal to obtain a third detection signal; Perform image suppression reception on the third detection signal to obtain a third detection signal after image suppression reception.

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