Optically assisted wideband frequency hopping signal channelization receiver and method

Abstract

The application relates to a light-assisted wideband frequency hopping signal channelization receiving device and method, which combines photon channelization technology, image rejection receiving and frequency hopping signal receiving technology, breaks through an existing electronic bottleneck, realizes six-channel channelization receiving of a wideband frequency hopping signal, greatly simplifies a structure and reduces the demand of a receiver rear end on a high-speed ADC.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of microwave photon anti-jamming communication, in particular to an optical-assisted wideband frequency hopping signal channelization receiving device and method. BACKGROUND

[0002] As a typical open system, satellite communication systems are vulnerable to various types of interference. Therefore, when meeting the demand for large capacity and high data rate communication, it is crucial to improve the stability and anti-jamming capability of the communication system. Due to the advantages of anti-fading, anti-jamming and low interception performance of frequency hopping spectrum technology, satellite broadband frequency hopping systems using high-speed frequency hopping technology have alleviated the threat of electronic jamming to communication links to a certain extent.

[0003] In the increasingly complex electromagnetic environment, the capabilities of interference and monitoring equipment are constantly improving. The anti-interference capability of traditional frequency hopping technology is gradually weakened. The next generation of anti-jamming satellite communication systems are developing towards wider bandwidth and faster frequency hopping. However, these systems have technical obstacles in terms of frequency hopping bandwidth and rate. These limitations can affect data transmission speed, reduce communication efficiency, and can compromise signal security. For example, if the frequency hopping rate is insufficient, sophisticated eavesdropping devices can be able to predict or track frequency changes, posing a threat to communication security. Similarly, limited bandwidth can result in a narrow frequency range, increasing the likelihood of system congestion and interference.

[0004] Traditional frequency hopping communication systems achieve frequency hopping and dehopping by using fast frequency synthesizers and mixers. In traditional frequency hopping signal generation, the source information is first modulated onto a carrier, and an FSK or BPSK signal is generated by mixing with a local oscillator. The local oscillator signal is generated by a frequency synthesizer controlled by a frequency hopping pseudo-random spreading code. In the traditional frequency hopping signal receiving 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 expanded by using frequency multiplication techniques to expand the frequency hopping oscillator, high-order multiplication will significantly increase the phase noise of the system and reduce the communication efficiency. Therefore, in the traditional frequency hopping signal generation and reception technology, a fast frequency hopping local signal source in a wideband range is a limiting factor for frequency hopping communication systems. SUMMARY

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

[0006] In a first aspect, a light-assisted wideband frequency hopping signal channelization receiving device is provided, comprising: a laser, a first optical splitter, a first Mach-Zehnder modulator, a second Mach-Zehnder 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 split into two optical signals by the first optical splitter, denoted as a first optical signal and a second optical signal;

[0008] The first optical signal is input to the first Mach-Zehnder modulator to modulate the wideband frequency hopping signal to obtain a first modulated optical signal; the first modulated optical signal is split into two optical signals by the second optical splitter, denoted as a third optical signal and a fourth optical signal; the third optical signal is input to the first filter for filtering processing to obtain a first filtered signal; 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;

[0009] The second optical signal is input to the second Mach-Zehnder modulator to modulate the local oscillator signal to obtain a second modulated optical signal; the second modulated optical signal is split into two optical signals by the third optical splitter, denoted as a fifth optical signal and a sixth optical signal; the fifth optical signal is input to the second filter for filtering processing to obtain a second filtered signal; the sixth optical signal is input to the acousto-optic modulator to modulate the frequency shift signal to obtain a third modulated signal, which is input to the second wavelength division multiplexer for upper and lower sideband separation 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 to the first coherent receiver for coupling and down-conversion to obtain a first probe signal, which is input to the first 90° bridge for image rejection reception to obtain a first image rejection received probe signal;

[0011] The first upper sideband signal and the second upper sideband signal are input to the second coherent receiver for coupling and down-conversion to obtain a second probe signal, which is input to the second 90° bridge for image rejection reception to obtain a second image rejection received probe signal;

[0012] The first lower sideband signal and the second lower sideband signal are input to the third coherent receiver for coupling and down-conversion to obtain a third probe signal, which is input to the third 90° bridge for image rejection reception to obtain a third image rejection received probe signal.

[0013] In one embodiment, the first optical signal is input to the first Mach-Zehnder modulator to modulate the wideband frequency hopping signal to obtain a first modulated optical signal, which is represented by the following formula:

[0014]

[0015] wherein E MZM (t) is the first modulated optical signal, E0 is the amplitude of the optical carrier, f c is the center frequency of the optical carrier, t is time, J1(m RF ) is the first kind Bessel function, m RF is the modulation index of the first Mach-Zehnder modulator, and f RF is the frequency of the wideband frequency hopping signal.

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

[0017]

[0018] wherein E 滤波1 (t) is the first filtered signal, E0 is the amplitude of the optical carrier, f c is the center frequency of the optical carrier, t is time, J1(m RF ) is the first kind Bessel function, m RF is the modulation index of the first Mach-Zehnder modulator, and f RF is the frequency of the wideband frequency hopping signal.

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

[0020]

[0021] wherein E 上边带1 (t) is the first upper sideband signal, t is time, a 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 first kind Bessel function, m RF is the modulation index of the first Mach-Zehnder modulator, f RF is the frequency of the wideband frequency hopping signal, and E 下边带1 (t) is the first lower sideband signal.

[0022] In one embodiment, the second optical signal is input to the second Mach-Zehnder modulator to modulate the local signal to obtain a second modulated optical signal, which is represented by the following formula:

[0023]

[0024] wherein, is the second modulated optical signal, E0is the amplitude of the optical carrier, f c is the center frequency of the optical carrier, t is time, J1(m Lo ) is the first kind Bessel function, m Lo is the modulation index of the second Mach-Zehnder modulator, f Lo is the frequency of the local oscillator signal.

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

[0026]

[0027] wherein, E′ MZM (t) is the third modulated signal, t is time, E0is the amplitude of the optical carrier, f c is the center frequency of the optical carrier, J1(m Lo ) is the first kind Bessel function, m Lo is the modulation index of the second Mach-Zehnder 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 comprises 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 comprises 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 comprises 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 according to 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] wherein, E 滤波1 (t) is the first filtered signal, E 滤波2 (t) is the second filtered signal.

[0036] In one embodiment, the first probe 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] wherein, E I11 (t), E I12 (t), E W11 (t), E Q12 (t) are four coupling signals outputted by the first 90° optical coupler.

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

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

[0042] The first modulated optical signal is divided into two optical signals, denoted 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 subjected to upper and lower sideband separation to obtain a first upper sideband signal and a first lower sideband signal;

[0043] The second modulated optical signal is divided into two optical signals, denoted as a fifth optical signal and a sixth optical signal; the fifth optical signal is filtered to obtain a second filtered signal; the sixth optical signal is modulated with a frequency shift signal to obtain a third modulated signal; the third modulated signal is subjected to upper and lower sideband separation 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 probe signal; the first probe signal is subjected to image rejection reception to obtain a first image-rejection-received probe signal;

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

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

[0047] Compared with the prior art, the application has the following beneficial effects: the light-assisted wideband frequency hopping signal channelization receiving device and method of the application combines photonic channelization technology, image rejection reception and frequency hopping signal receiving technology, breaks through the existing electronic bottleneck, realizes six-channel channelization reception of the wideband frequency hopping signal, greatly simplifies the structure and reduces the demand for high-speed ADC of the receiver backend. BRIEF DESCRIPTION OF DRAWINGS

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

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

[0050] Figure 2 The spectrum diagram of the coherent receiver output signal is shown; wherein (a)-(f) are the spectrum diagrams of channel 1-channel 6 output signals, respectively;

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

[0052] In the following, exemplary embodiments of the present application will be described with reference to the accompanying drawings. In the description, not all of the features of the actual embodiments have been described in order to avoid obscuring the application with unnecessary detail. It should be appreciated that in the development of any such actual embodiment, numerous implementation-specific decisions can be made to achieve the developer's specific goals, such as compliance with system-related and business-related constraints, which can vary from one implementation to another. Moreover, it should be appreciated that such a development effort might be complex and time-consuming, but would nevertheless result in an embodiment being implemented in accordance with the present application.

[0053] It is also to be noted that, in the following description, only the device structures closely related to the scheme according to the present application are shown in the drawings, and other details not closely related to the present application are omitted.

[0054] It should be appreciated that the present application is not limited to the described embodiments by virtue of the following description with reference to the drawings. In this context, the embodiments can be combined with each other, features can be replaced or borrowed between different embodiments, and one or more features can be omitted in an embodiment.

[0055] The embodiment of the present application provides a light-assisted wideband frequency hopping signal channelization receiving device, which utilizes two Mach-Zehnder Modulators (MZMs) to perform spectrum replication on a local oscillator signal and a wideband frequency hopping signal. An Acousto-optic Modulator (AOM) is utilized to perform local oscillator light frequency shift and channel selection, a Dense Wavelength Division Multiplexer (DWDM) and a filter are utilized to select different frequency bands, and a coherent receiver is utilized to finally realize down-conversion and channel segmentation of an ultra-wideband frequency hopping signal.

[0056] Figure 1 A structural block diagram of the light-assisted wideband frequency hopping signal channelization receiving device is shown, referring to Figure 1The light-assisted broadband frequency hopping signal channelization receiving device comprises a laser, a first optical splitter, a first MZM, a second MZM, an optical amplifier, a second optical splitter, a third optical splitter, a first filter, a first WDM, a second filter, an AOM, a second WDM, 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 the various components are described in detail below.

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

[0059] The first optical signal is input to the first MZM, which modulates the broadband frequency hopping signal to obtain a first modulated optical signal. The broadband frequency hopping signal can be expressed as V RF cos(2πf RF t), where f RF is the frequency of the broadband frequency hopping signal, and V RF is the amplitude of the broadband frequency hopping signal. Specifically, the first modulated optical signal can be expressed by the following formula:

[0060]

[0061] where E MZM (t) is the first modulated optical signal, E0 is the amplitude of the optical carrier, f c is the center frequency of the optical carrier, t is time, J1(m RF ) is the first Bessel function, m RF is the modulation index of the first MZM, and f RF is the frequency of the broadband frequency hopping signal.

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

[0063]

[0064] where E 滤波1(t) is the first filtered signal, E0 is the amplitude of the optical carrier, f c is the center frequency of the optical carrier, t is time, J1(m RF ) is the first Bessel function, m RF is the modulation index of the first Mach-Zehnder modulator, f RF is the frequency of the wideband 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 following formula is used to represent:

[0066]

[0067] Wherein, E 上边带1 (t) is the first upper sideband signal, t is time, a 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 first Bessel function, m RF is the modulation index of the first Mach-Zehnder modulator, f RF is the frequency of the wideband 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 Mach-Zehnder modulator to modulate the local signal to obtain a second modulated optical signal; the local signal can be represented as V Lo cos(2πf Lo t), V Lo is the amplitude of the local signal, f Lo is the frequency of the local signal. The second modulated optical signal can be represented by the following formula:

[0069]

[0070] Wherein, is the second modulated optical signal, E0 is the amplitude of the optical carrier, f c is the center frequency of the optical carrier, t is time, J1(m Lo ) is the first Bessel function, m Lo is the modulation index of the second Mach-Zehnder modulator, f Lo is the frequency of the local signal.

[0071] The second modulated optical signal is divided into two optical signals by the third optical splitter, denoted as the fifth optical signal and the sixth optical signal; the fifth optical signal is input to the second filter for filtering processing to obtain a second filtered signal E 滤波2(t); the sixth optical signal is input to the acousto-optic modulator to modulate the frequency-shifted signal to obtain a third modulated signal; the frequency-shifted signal can be represented 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 represented by the following formula:

[0072]

[0073] wherein E′ MZM (t) is the third modulated signal, t is time, E0is the amplitude of the optical carrier, f c is the center frequency of the optical carrier, J1(m Lo ) is the first Bessel function, m Lo is the modulation index of the second Mach-Zehnder modulator, f Lo is the frequency of the local signal, and f s is the frequency of the frequency-shifted signal.

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

[0075] The first filtered signal and the second filtered signal are input to the first coherent receiver to be coupled and down-converted to obtain a first probe signal, and the first probe signal is input to the first 90° bridge to perform image rejection reception to obtain a first image rejection received probe signal;

[0076] The first upper sideband signal and the second upper sideband signal are input to the second coherent receiver to be coupled and down-converted to obtain a second probe signal, and the second probe signal is input to the second 90° bridge to perform image rejection reception to obtain a second image rejection received probe signal;

[0077] The first lower sideband signal and the second lower sideband signal are input to the third coherent receiver to be coupled and down-converted to obtain a third probe signal, and the third probe signal is input to the third 90° bridge to perform image rejection reception to obtain a third image rejection received probe signal.

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

[0079] Here, the four coupling signals outputted by the first 90° optical coupler are E I11 (t), E I12 (t), E Q11 (t), and 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] wherein E 滤波1 (t) is the first filtered signal, E 滤波2 (t) is the second filtered signal.

[0084] According to the calculation results, it can be known that:

[0085]

[0086] wherein, and respectively represent different polarization state light vector mode components.

[0087] The first detection signal is I I1 (t), the second detection signal is 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] wherein E I11 (t), E I12 (t), E Q11 (t), E Q12 (t) are the four coupling signals outputted by the first 90° optical coupler.

[0091] The second coherent receiver comprises a second 90° optical coupler, a third balanced photodetector BPD3 and a fourth balanced photodetector 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 photodetector and the fourth balanced photodetector output a second detection signal according to the four coupled signals;

[0092] The third coherent receiver comprises a third 90° optical coupler, a fifth balanced photodetector BPD5 and a sixth balanced photodetector 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 photodetector and the sixth balanced photodetector output a third detection signal according to the four coupled signals.

[0093] It should be noted that the internal processing process 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 described again.

[0094] It can be known from the analysis of the first detection signal that, after frequency conversion, the frequency hopping signal is brought to the intermediate frequency (IF) range. However, at this point, the left and right parts of the signal spectrum are both down-converted to the same intermediate frequency range, resulting in spectral overlap. In these parts, the frequency hopping signal becomes the mirror interference of each other, so that the frequency of the received hopping signal cannot be distinguished. Therefore, 3 90° bridges are set to perform mirror suppression reception on 3 detection signals, and after mirror suppression, two mutually mirrored channels are effectively separated into two different channels, and each channel can receive different frequency hopping signals.

[0095] The present application makes full use of the wideband and reconfigurable characteristics of photonic technology, and provides a new solution for wideband signal reception. In the field of optics, a wideband frequency hopping signal is sliced into multiple channels, and then they are down-converted to the intermediate frequency. By this method of frequency hopping signal reception, the difficulty of frequency hopping at the receiving end can be significantly reduced.

[0096] The present application also provides an optical-assisted wideband frequency modulation signal channelization reception method, comprising:

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

[0098] Then, the wideband frequency hopping signal is modulated based on the first optical signal to obtain a first modulated optical signal; the first modulated optical signal is divided into two optical signals, denoted 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 an upper sideband signal and a lower sideband signal;

[0099] Then, the local 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, denoted as a fifth optical signal and a sixth optical signal; the fifth optical signal is filtered to obtain a second filtered signal; the sixth optical signal is used to modulate the frequency shift signal to obtain a third modulated signal; the third modulated signal is subjected to upper and lower sideband separation 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 probe signal; the first probe signal is subjected to image rejection reception to obtain a first image rejection received probe signal;

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

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

[0103] The specific implementation process of each step in the embodiment can be referred to the foregoing embodiment part, and the technical effects thereof correspond to the technical effects of the above method, which will not be described here.

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

[0105] The duration of the generated signal is 900 nanoseconds, and the signal switching time is 100 nanoseconds. The frequency hopping 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 of the frequency hopping signal from 17 GHz to 23 GHz is 6 GHz. The local frequency signal has a frequency of 20 GHz and a power of 10 dBm; Figure 3The time-frequency diagram of the output signal of the coherent receiver is shown, wherein (a) is the time-frequency diagram of the frequency hopping signal, (b)-(g) are the time-frequency diagrams of the output signals of channels 1-6 respectively.

[0106] The light-assisted wideband 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 is only various embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An optically assisted wideband frequency-hopping signal channelization receiver apparatus, comprising: Comprising: a laser, a first optical splitter, a first Mach-Zehnder modulator, a second Mach-Zehnder 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 split into two optical signals by the first optical splitter, denoted as a first optical signal and a second optical signal; the first optical signal is input to the first Mach-Zehnder modulator to modulate a broadband frequency hopping signal to obtain a first modulated optical signal; the first modulated optical signal is split into two optical signals by the second optical splitter, denoted as a third optical signal and a fourth optical signal; the third optical signal is input to the first filter for filtering processing to obtain a first filtered signal; 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 second optical signal is input to the second Mach-Zehnder modulator to modulate a local oscillator signal to obtain a second modulated optical signal; the second modulated optical signal is split into two optical signals by the third optical splitter, denoted as a fifth optical signal and a sixth optical signal; the fifth optical signal is input to the second filter for filtering processing to obtain a second filtered signal; the sixth optical signal is input to the acousto-optic modulator to modulate a frequency shift signal to obtain a third modulated signal, which is input to the second wavelength division multiplexer for upper and lower sideband separation to obtain a second upper sideband signal and a second lower sideband signal; the first filtered signal and the second filtered signal are input to the first coherent receiver for coupling and down-conversion to obtain a first probe signal, which is input to the first 90° bridge for image rejection reception to obtain a first image rejection received probe signal; the first upper sideband signal and the second upper sideband signal are input to the second coherent receiver for coupling and down-conversion to obtain a second probe signal, which is input to the second 90° bridge for image rejection reception to obtain a second image rejection received probe signal; the first lower sideband signal and the second lower sideband signal are input to the third coherent receiver for coupling and down-conversion to obtain a third probe signal, which is input to the third 90° bridge for image rejection reception to obtain a third image rejection received probe signal.

2. The apparatus of claim 1, wherein, the first optical signal is input to the first Mach-Zehnder modulator to modulate a broadband frequency hopping signal to obtain a first modulated optical signal, which is represented by the following formula: where E MZM (t) is the first modulated optical signal, E0 is the amplitude of the optical carrier, f c is the center frequency of the optical carrier, t is time, J1(m RF ) is the first order Bessel function, m RF is the modulation index of the first Mach-Zehnder modulator, f RF is the frequency of the wideband frequency hopping signal.

3. The apparatus of claim 1, wherein, the third optical signal is input to the first filter for filtering processing to obtain a first filtered signal, which is represented by the following formula: Wherein, E filter 1 (t) is the first filtered signal, E0 is the amplitude of the optical carrier, f c is the center frequency of the optical carrier, t is time, J1(m RF ) is the first Bessel function, m RF is the modulation index of the first Mach-Zehnder modulator, f RF is the frequency of the wideband frequency hopping signal.

4. The apparatus of claim 1, wherein, 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, which are represented by the following formula: Wherein, E upper sideband 1(t) is the first upper sideband signal, t is time, alpha DWDM Is the insertion loss of the first wave 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 first Bessel function, m RF Is the modulation index of the first MZM, f RF Is the frequency of the wideband frequency hopping signal; E lower sideband 1(t) is the first lower sideband signal.

5. The apparatus of claim 1, wherein, The second optical signal is input to the second Mach-Zehnder modulator to modulate the local oscillator signal to obtain a second modulated optical signal, which is expressed by the following formula: wherein, E0is the amplitude of the optical carrier, f c is the center frequency of the optical carrier, t is time, J1(m Lo ) is the first kind Bessel function, m Lo is the modulation index of the second Mach-Zehnder modulator, f Lo is the frequency of the local oscillator signal.

6. The apparatus of claim 1, wherein, The sixth optical signal is input to the acousto-optic modulator to modulate the frequency shift signal to obtain a third modulated signal, which is expressed by the following formula: where E ′ MZM (t) is the third modulated signal, t is time, E0is the amplitude of the optical carrier, f c is the center frequency of the optical carrier, J1(m Lo ) is the first kind Bessel function, m Lo is the modulation index of the second MZM, f Lo is the frequency of the local signal, f s is the frequency of the frequency-shifted signal.

7. The apparatus of claim 1, wherein, The first coherent receiver comprises 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 comprises 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 comprises 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 apparatus of claim 7, wherein, The four coupling signals outputted 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) Wherein, Efilter1(t) is the first filtered signal, and Efilter2(t) is the second filtered signal.

9. The apparatus of claim 7, wherein, the first probe 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 wherein E I11 (t), E I12 (t), E Q11 (t), E Q12 (t) are the four coupling signals outputted by the first 90° optical coupler.

10. A method of optically assisted wideband frequency-modulated signal channelization reception, characterized by, Comprise: generating an optical carrier, and dividing the optical carrier into two optical signals, denoted as a first optical signal and a second optical signal; modulating a wideband 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, denoted as a third optical signal and a fourth optical signal; filtering the third optical signal to obtain a first filtered signal; separating the fourth optical signal into a first upper sideband signal and a first lower sideband signal; modulating a 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, denoted as a fifth optical signal and a sixth optical signal; filtering the fifth optical signal to obtain a second filtered signal; modulating a frequency shift signal based on the sixth optical signal to obtain a third modulated signal; separating the third modulated signal into 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; image rejection receiving the first detection signal to obtain a first image rejection received detection signal; coupling and down-converting the first upper sideband signal and the second upper sideband signal to obtain a second detection signal; image rejection receiving the second detection signal to obtain a second image rejection received detection signal; coupling and down-converting the first lower sideband signal and the second lower sideband signal to obtain a third probe signal; performing image rejection reception on the third probe signal to obtain a third image-rejected probe signal.

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