Optical signal output module, output method, antenna transmitting module and radio frequency system

Abstract

The embodiment of the invention provides an optical signal output module, an output method, an antenna emission module and a radio frequency system, the optical signal output module comprises a frequency mixing circuit, the frequency mixing circuit is provided with a frequency mixer and a change-over switch, the change-over switch is connected with the frequency mixer and determines a frequency mixing mode of the frequency mixer, and the frequency mixer carries out frequency mixing processing based on the frequency mixing mode to obtain a modulation signal; the modulation circuit is provided with an electro-optical modulator and is used for modulating the modulation signal and the carrier optical signal into a target optical signal; and the transmission circuit is connected with the modulation circuit and the antenna emission module, and is used for transmitting the target optical signal to the antenna emission module, so that the antenna emission module generates a radio frequency signal according to the target optical signal. The switching switch is connected with the frequency mixer, and the frequency mixing mode corresponding to the frequency mixer is determined, so that the frequency mixer performs frequency mixing processing in the frequency mixing mode, the frequencies of the target optical signal and the radio frequency signal can be simply adjusted, optical signals with different frequencies can be compatibly output through a small-size structure, and multi-frequency fusion of the optical signals is realized.

Description

Technical Field

[0001] The present invention relates to the field of communication equipment, and in particular to an optical signal output module, an output method, an antenna transmission module and a radio frequency system. Background Art

[0002] For RF systems, since lower frequency bands do not have enough bandwidth allocation to create the large-bandwidth carriers required for 5G / 6G, and the signal propagation conditions in ultra-high frequency bands are harsh, the cost of applying them for wide-area coverage is very high. Therefore, the mid-band spectrum (7-15GHz) in the Sub-15G band is the best choice for providing both extreme capacity and competitive coverage.

[0003] For traditional base station architecture, to achieve high-quality wireless communication in the Sub-15GHz frequency band, multiple RF systems are usually required to be superimposed. Limited by the narrowband characteristics of traditional electronic devices, when realizing 7-15GHz multi-frequency fusion, each frequency point needs to be equipped with an independent RF transceiver equipment, RF power amplifier device, etc., which makes the RF system larger in size, weight and power consumption.

[0004] On the other hand, since traditional mixers are difficult to handle the frequency conversion requirements of high-frequency RF signals, problems such as inter-band crosstalk, image frequency interference and local oscillator leakage are prone to occur. Generally, multi-stage frequency conversion and multi-stage filtering are required in the RF system, which will seriously reduce the dynamic range and frequency conversion efficiency of the system, and require a large number of RF devices such as local oscillator sources and mixers, which makes the size, weight, power consumption and electromagnetic interference of the RF system unsatisfactory. Summary of the invention

[0005] The main purpose of the embodiments of the present application is to provide an optical signal output module, an output method, an antenna transmission module and a radio frequency system, aiming to output optical signals of different frequencies in a compatible manner with a small-volume optical signal output module structure, and to realize multi-frequency fusion of optical signals across frequency bands.

[0006] In a first aspect, an embodiment of the present application provides an optical signal output module, which is adapted to an antenna transmission module, and the optical signal output module includes:

[0007] A mixing circuit is provided with a mixer and a switching switch connected to the mixer, the switching switch is connected to the mixer and determines a mixing mode corresponding to the mixer, and the mixer performs mixing processing on a switching oscillation signal and / or an analog signal transmitted by the switching switch based on the mixing mode to obtain a modulated signal;

[0008] A modulation circuit is provided with an electro-optical modulator, the electro-optical modulator is connected to the mixer, and is used to modulate the modulation signal output by the mixer and the received carrier optical signal into a target optical signal;

[0009] The transmission circuit is connected between the modulation circuit and the antenna transmission module, and is used to transmit the target optical signal to the antenna transmission module so that the antenna transmission module performs photoelectric detection on the target optical signal to generate a radio frequency signal.

[0010] In some embodiments, the mixer has a first input port and a second input port, the switch is connected to the first input port and the second input port, and is used to switch the oscillation signal and / or the analog signal to the input port of the mixer; the switch is connected to the mixer and determines the mixing mode corresponding to the mixer includes:

[0011] When the oscillation signal and the analog signal are input to the mixer from the same input port, the mixer performs mixing processing on the oscillation signal and the analog signal in a first mixing mode, and the first mixing mode is an up-conversion processing on the oscillation signal;

[0012] When the oscillation signal and the analog signal are input to the mixer from different input ports respectively, the mixer mixes the oscillation signal and the analog signal in a second mixing mode, and the second mixing mode is a down-conversion process of the oscillation signal.

[0013] In some embodiments, the switch input end, the first output end and the second output end, and the first output end of the switch is connected to the first input port of the mixer, the second output end of the switch is connected to the second input port of the mixer, the input end of the switch is used to receive the oscillation signal, and the switch is used to switch its input end to be connected to the first output end or the second output end;

[0014] The mixer is used for fixedly receiving an analog signal through one of the first input port and the second input port.

[0015] In some embodiments, the mixer has a first output port and a second output port, the modulated signal includes a first modulated sub-signal and a second modulated sub-signal, and the mixer is used to output the first modulated sub-signal through the first output port and output the second modulated sub-signal through the second output port.

[0016] In some embodiments, an electro-optic modulator comprises:

[0017] A branching unit, used for receiving a carrier optical signal output by the laser light source, and decomposing the carrier optical signal into a first branch optical signal and a second branch optical signal;

[0018] A first sub-modulator, the first sub-modulator is connected to the branch unit and the first output port of the mixer, and is used to modulate the first branch optical signal according to the first modulation sub-signal to obtain a first modulated optical signal;

[0019] The second sub-modulator is connected to the branch unit and the second output port of the mixer, and is used for modulating the second branch optical signal according to the second modulated sub-signal to obtain a second modulated optical signal.

[0020] The combining unit is connected to the first sub-modulator and the second sub-modulator, and is used to combine the first modulated optical signal and the second modulated optical signal to obtain a target optical signal.

[0021] In some embodiments, the optical signal output module further includes an amplifying circuit, which is connected between the modulation circuit and the transmission circuit and is used to amplify the target optical signal and transmit the amplified target optical signal to the transmission circuit.

[0022] In some embodiments, the optical signal output module further includes an analog signal output circuit, which is connected to the mixing circuit and is used to output an analog signal to the mixing circuit, and the frequency of the analog signal is adjustable.

[0023] In a second aspect, an embodiment of the present application further provides an optical signal output method, which is applied to any optical signal output module provided in the specification of the present application, and the method includes:

[0024] Acquire a target radio frequency frequency and a frequency of an oscillation signal, wherein the target radio frequency frequency is an expected frequency of a radio frequency signal generated by the antenna transmitting module in response to the optical signal output module outputting a target optical signal;

[0025] Controlling a switch in the optical signal output module to switch a mixing mode of the mixer according to the target radio frequency and the frequency of the oscillation signal;

[0026] The optical signal output module is controlled based on the mixing mode of the mixer to generate a target optical signal, and the target optical signal is transmitted to the antenna transmission module.

[0027] In some embodiments, the mixer has a first input port and a second input port, the switch is connected to the first input port and the second input port, and is used to switch the input port to which the oscillation signal and / or the analog signal is input; the switch in the optical signal output module is controlled to switch the mixing mode of the mixer according to the target radio frequency and the frequency of the oscillation signal, including:

[0028] If the frequency of the target radio frequency signal is lower than the frequency of the oscillation signal, a first switching operation is performed on the switch so that the oscillation signal and the analog signal are controlled to be input into the mixer from the same input port;

[0029] If the frequency of the target radio frequency signal is greater than or equal to the frequency of the oscillation signal, a second switching operation is performed on the switch, so that the oscillation signal and the analog signal are respectively input into the mixer from different input ports.

[0030] In some embodiments, under the condition that the oscillation signal and the analog signal are input into the mixer from the same input port, the frequency of the radio frequency signal generated by the antenna transmission module is the difference between the frequencies of the oscillation signal and the analog signal;

[0031] Under the condition that the oscillation signal and the analog signal are respectively input into the mixer from different input ports, the frequency of the RF signal generated by the antenna transmitting module is the sum of the frequencies of the oscillation signal and the analog signal.

[0032] In some implementations, before controlling the optical signal output module to generate the target optical signal based on the mixing mode of the mixer, the method further includes:

[0033] The frequency of the analog signal is adjusted according to the difference between the frequency of the oscillation signal and the target radio frequency.

[0034] On the third aspect, an embodiment of the present application also provides an antenna transmitting module for adapting to any optical signal output module provided in the specification of this application, the antenna transmitting module is used to perform photoelectric detection on the target optical signal output by the optical signal output module to generate a radio frequency signal, and the frequency of the radio frequency signal is related to the frequency characteristics of the target optical signal.

[0035] In a fourth aspect, an embodiment of the present application further provides a radio frequency system, the radio frequency system comprising:

[0036] Any optical signal output module provided in this application specification;

[0037] The antenna transmitting module is connected to the optical signal output module and is used to perform photoelectric detection on the target optical signal output by the optical signal output module to generate a radio frequency signal, the frequency of the radio frequency signal is related to the frequency characteristics of the target optical signal.

[0038] In summary, the embodiments of the present application provide an optical signal output module, an output method, an antenna transmitting module and a radio frequency system. The optical signal output module provided in the embodiments of the present application is used to adapt to the antenna transmitting module, and the optical signal output module includes: a mixing circuit, which is provided with a mixer and a switching switch connected to the mixer, the switching switch is connected to the mixer and determines the mixing mode corresponding to the mixer, and the mixer mixes the switching oscillation signal and / or the analog signal transmitted by the switching switch based on the mixing mode to obtain a modulated signal; a modulation circuit, which is provided with an electro-optical modulator, and the electro-optical modulator is connected to the mixer, and is used to modulate the modulated signal output by the mixer and the received carrier optical signal into a target optical signal; a transmission circuit, which is connected between the modulation circuit and the antenna transmitting module, and is used to transmit the target optical signal to the antenna transmitting module, so that the antenna transmitting module performs photoelectric detection on the target optical signal to generate an radio frequency signal. Based on connecting the switching switch with the mixer and determining the mixing mode corresponding to the mixer, so that the mixer mixes the oscillation signal and the analog signal under the mixing mode, the frequency characteristics of the target optical signal output by the optical signal output module and the radio frequency signal detected by the antenna transmission module can be adjusted quickly, directly and easily, so that optical signals of different frequencies can be output compatibly with a small-volume optical signal output module structure, effectively realizing cross-band multi-frequency fusion of optical signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0040] Figure 1 A structural block diagram of an optical signal output module provided in an embodiment of the present application;

[0041] Figure 2 A schematic diagram of a circuit structure of an optical signal output module provided in an embodiment of the present application;

[0042] Figure 3 A schematic diagram of the circuit structure of a mixing circuit in an optical signal output module provided in an embodiment of the present application;

[0043] Figure 4 A schematic diagram of the circuit structure of an electro-optic modulator in an optical signal output module provided in an embodiment of the present application;

[0044] Figure 5 A schematic diagram of frequency characteristics of a target optical signal output by a modulation circuit in an optical signal output module and a radio frequency signal acquired by an antenna transmission module provided in an embodiment of the present application;

[0045] Figure 6 A schematic diagram of a flow chart of an optical signal output method provided in an embodiment of the present application;

[0046] Figure 7 A schematic block diagram of the structure of a radio frequency system provided in an embodiment of the present application.

[0047] Reference numerals:

[0048] 1. RF system; 100. Optical signal output module; 200. Antenna transmission module; 110. Mixing circuit; 111. Mixer; 1111. First input port; 1112. Second input port; 1113. First output port; 1114. Second output port; 112. Switch; 120. Modulation circuit; 121. Electro-optical modulator; 1211. First sub-modulator; 1212. Second sub-modulator; 1213. Branching unit; 1214. Combiner unit; 1215. Phase shifter; 130. Transmission circuit; 140. Amplification circuit. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0050] The flowcharts shown in the accompanying drawings are only examples and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps may also be decomposed, combined or partially merged, so the actual execution order may change according to actual conditions.

[0051] It should be understood that the terms used in this application specification are only for the purpose of describing specific embodiments and are not intended to limit the application. As used in this application specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0052] The embodiments of the present application provide an optical signal output module, an output method, an antenna transmission module and a radio frequency system. Some embodiments of the present application are described in detail below in conjunction with the accompanying drawings. The following embodiments and features in the embodiments can be combined with each other without conflict.

[0053] Please refer to Figure 1 and Figure 2 , Figure 1 A structural block diagram of an optical signal output module provided in an embodiment of the present application, Figure 2 A schematic diagram of the circuit structure of an optical signal output module provided in an embodiment of the present application.

[0054] like Figure 1 to Figure 2 As shown, an embodiment of the present application provides an optical signal output module 100, which is adapted to an antenna transmitting module 200. The optical signal output module 100 is used to generate a target optical signal and transmit the target optical signal to the antenna transmitting module 200, and the antenna transmitting module 200 is used to perform photoelectric detection on the target optical signal output by the optical signal output module 100 to generate a radio frequency signal, and the frequency of the radio frequency signal is related to the frequency characteristics of the target optical signal.

[0055] For example, the optical signal output module 100 provided in the present application can be applied to the transmitting end on the BBU (Baseband Unit) side of the communication device, and correspondingly, the antenna transmitting module 200 is, for example, the receiving end on the AAU (Active Antenna Unit) side of the communication device. Specifically, the transmitting end on the BBU side of the communication device is adapted to the receiving end on the AAU side, the transmitting end on the BBU side is used to generate a target optical signal and transmit it to the receiving end on the AAU side, and the receiving end on the AAU side is used to perform photoelectric detection on the target optical signal output by the optical signal output module 100 to generate a radio frequency signal related to the frequency characteristics of the target optical signal.

[0056] Specifically, the optical signal output module 100 provided in the embodiment of the present application includes: a mixing circuit 110, a modulation circuit 120 and a transmission circuit 130. The specific structure and operation principle of each circuit are described in detail below.

[0057] Specifically, the mixing circuit 110 is provided with a mixer 111 and a switching switch 112 connected to the mixer 111. The switching switch 112 is connected to the mixer 111 and determines a mixing mode corresponding to the mixer 111. The mixer 111 mixes the switching oscillation signal and / or the analog signal transmitted by the switching switch 112 based on the mixing mode to obtain a modulated signal.

[0058] The modulation circuit 120 is provided with an electro-optic modulator 121, which is connected to the mixer 111 and corresponds to a preset laser light source. The laser light source is used to output a carrier light signal to the electro-optic modulator 121, and the electro-optic modulator 121 is used to modulate the modulation signal output by the mixer 111 and the received carrier light signal into a target light signal. The transmission circuit 130 is connected between the modulation circuit 120 and the antenna transmission module 200, and is used to transmit the target light signal to the antenna transmission module 200.

[0059] It should be noted that the electro-optic modulator 121 modulates the frequency characteristics of the carrier optical signal according to the modulation signal to obtain the target optical signal, so the frequency characteristics of the target optical signal are related to the modulation signal.

[0060] Furthermore, the antenna transmitting module 200 is used to perform photoelectric detection on the target optical signal output by the optical signal output module 100 to generate a radio frequency signal, and the frequency of the radio frequency signal is related to the frequency characteristics of the target optical signal.

[0061] It should be noted that, based on the connection between the switching switch 112 and the mixer 111 and the determination of the mixing mode corresponding to the mixer 111, so that the mixer 111 performs mixing processing on the oscillation signal and the analog signal under the mixing mode, when using the optical signal output module 100 provided in the embodiment of the present application, under the premise of not adjusting the oscillation signal and the analog signal, the switching switch can be directly controlled to control the mixing processing performed by the mixing circuit, so as to obtain a target optical signal with a frequency characteristic that meets the desired target, and further generate the required RF signal at the antenna transmitting module 200.

[0062] Therefore, the optical signal output module 100 in the embodiment of the present application can switch the mixing mode of the mixer 111 by switching the switch 112, and quickly, directly and easily adjust the frequency characteristics of the target optical signal output by the optical signal output module 100 and the radio frequency signal detected by the antenna transmission module 200. The small-volume optical signal output module 100 structure is compatible with the output of optical signals of different frequencies, effectively realizing cross-band multi-frequency fusion of optical signals while taking into account the SWaP (Size, Weight and Power) challenges faced by the communication system.

[0063] In some implementations, the oscillation signal received by the frequency mixing circuit 110 is provided by a local oscillator. For example, for the Sub-15G frequency band, the local oscillator is set to provide an oscillation signal with a fixed frequency of 10 GHz.

[0064] In some implementations, the frequency of the analog signal received by the mixer circuit 110 is adjustable.

[0065] For example, the analog signal received by the mixing circuit 110 is directly generated by the DAC (Digital to Analog Converter) on the BBU side, such as an intermediate frequency OFDM (Orthogonal Frequency Division Multiplexing) signal with a carrier frequency of 0-5GHz as the analog signal.

[0066] In some embodiments, the optical signal output module 100 further includes an analog signal output circuit, which is connected to the mixer circuit 110 and is used to output an analog signal to the mixer circuit 110, and the frequency of the analog signal is adjustable. Exemplarily, the analog signal output circuit includes a DAC, and the frequency of the analog signal can be adjusted by controlling the DAC to perform RF direct sampling of different frequencies.

[0067] It should be noted that, based on the adjustable analog signal, in addition to adjusting the mixing mode of the mixing circuit 110, the frequency characteristics of the target optical signal can also be adjusted by adjusting the analog signal, thereby increasing the flexibility of optical signal adjustment. Thus, the optical signal output module 100 with a small volume can be compatible with the output of optical signals of different frequencies, effectively realizing cross-band multi-frequency fusion of optical signals.

[0068] like Figure 2 As shown, in some embodiments, the mixer 111 has a first input port 1111 and a second input port 1112 , and the switching switch 112 is connected to the first input port 1111 and the second input port 1112 and is used to switch the oscillation signal and / or analog signal input to the input port of the mixer 111 .

[0069] Among them, when the oscillation signal and the analog signal are input to the mixer 111 from the same input port, the mixer 111 mixes the oscillation signal and the analog signal in a first mixing mode to obtain a first type of modulation signal; when the oscillation signal and the analog signal are input to the mixer 111 from different input ports respectively, the mixer 111 mixes the oscillation signal and the analog signal in a second mixing mode to obtain a second type of modulation signal.

[0070] It should be noted that, for the same oscillation signal and the same analog signal, the frequency characteristics of the first type of modulation signal obtained based on the first mixing mode and the second type of modulation signal obtained based on the second mixing mode are different.

[0071] Specifically, the first mixing mode is an up-conversion process of the oscillating signal, and the second mixing mode is a down-conversion process of the oscillating signal. It should be noted that the up-conversion process of the oscillating signal means that the frequency of the first type of modulation signal obtained after mixing is greater than the frequency of the oscillating signal. Conversely, the down-conversion process of the oscillating signal means that the frequency of the second type of modulation signal obtained after mixing is less than the frequency of the oscillating signal.

[0072] Furthermore, based on the different frequency characteristics between the first type of modulation signal and the second type of modulation signal, the electro-optical modulator 121 modulates the frequency characteristics of the carrier optical signal according to the frequency characteristics of the modulation signal to obtain the target optical signal. Therefore, by switching the oscillation signal and / or analog signal input to the input port of the mixer 111 through the switching switch 112, the frequency characteristics of the target optical signal can be adjusted.

[0073] Specifically, the mixer 111 is used to receive an oscillation signal and an analog signal through a first input port 1111 and a second input port 1112, and perform mixing operations on the oscillation signal and the analog signal, wherein different input ports of the mixer 111 to which the oscillation signal and the analog signal are input correspond to different mixing modes.

[0074] Exemplarily, when the oscillation signal and the analog signal are both input into the mixer 111 from the first input port 1111, the mixing circuit 110 switches to the first mixing mode; when the oscillation signal and the analog signal are both input into the mixer 111 from the second input port 1112, the mixing circuit 110 switches to the first mixing mode; when the oscillation signal and the analog signal are respectively input into the mixer 111 from the first input port 1111 and the second input port 1112, the mixing circuit 110 switches to the second mixing mode.

[0075] The input ports of the oscillation signal and the analog signal are switched by switching switch 112, and the switching switch 112 determines the mixing mode corresponding to the mixer 111. The mixer 111 mixes the oscillation signal and the analog signal based on the mixing mode to generate a corresponding modulation signal, and outputs the modulation signal to the modulation circuit 120, so that the modulation circuit 120 modulates the frequency characteristics of the carrier optical signal output by the preset light source according to the modulation signal to obtain the target optical signal.

[0076] like Figure 2 As shown, in some embodiments, the switch 112 has an input end, a first output end, and a second output end, and the first output end of the switch 112 is connected to the first input port 1111 of the mixer 111, and the second output end of the switch 112 is connected to the second input port 1112 of the mixer 111. The input end of the switch 112 is used to receive an oscillation signal, and the switch 112 is used to switch its input end to be connected to the first output end or the second output end;

[0077] The mixer 111 is used for fixedly receiving an analog signal through one of the first input port 1111 and the second input port 1112 .

[0078] Specifically, the switch 112 can control the oscillation signal to be input to the first input port 1111 or the second input port of the mixer 111. It should be understood that when the mixer 111 is fixed to receive the modulation signal from the first input port 1111 or the second input port, the switch 112 switches the oscillation signal to be input to the input port of the mixer 111, so that the oscillation signal and the analog signal can be input to the mixer 111 from the same input port, or the oscillation signal and the analog signal can be input to the mixer 111 from different input ports, respectively, so as to quickly switch the corresponding mixing mode.

[0079] It should be noted that when the frequencies of the oscillation signal and the analog signal are the same, the mixer 111 adopts the above two mixing modes to obtain different mixing modes, and the generated modulation signals are also different.

[0080] like Figure 3 As shown, in some embodiments, the mixer 111 includes a first output port 1113 and a second output port 1114, and the modulated signal is composed of a first modulated sub-signal and a second modulated sub-signal, and the first output end of the mixer 111 is used to output the first modulated sub-signal, and the second output end of the mixer 111 is used to output the second modulated sub-signal.

[0081] See also Figure 3 , Figure 3 A schematic diagram of the circuit structure of a mixing circuit in an optical signal output module provided in an embodiment of the present application.

[0082] like Figure 3 As shown, exemplarily, the mixer 111 is a 90° Hybrid (90-degree phase-shifted bridge), wherein the 90° Hybrid is composed of four electrical ports, including a first input port, a second input port, a first output port, and a second output port. Due to the phase-shifting function of the bridge, the signals of the first input port, the second input port, the first output port, and the second output port present a 90° orthogonal coupling relationship.

[0083] For example, the oscillation signal input to the mixer 111 is E LO =V LO sinω L t, the analog signal input to the mixer 111 is E IF =V IF sinω I t, where V LO is the amplitude of the oscillation signal, V IF is the amplitude of the analog signal, ω L is the frequency of the oscillation signal, ω I is the frequency of the analog signal.

[0084] If the oscillation signal and the analog signal are simultaneously input to the mixer 111 from the first input port, and the mixer 111 performs up-conversion processing on the oscillation signal, the signals output from the first output terminal and the second output terminal of the mixer 111 are E3 and E4 respectively, where:

[0085] E1=E LO +E IF

[0086] =V LO sinω L t+V IF sinω It

[0087] E2=j(E LO +E IF )

[0088] =j(V LO sinω L t+V IF sinω I t)

[0089] =V LO cosω L t+V IF cosω I t

[0090] It should be noted that E1 and E2 are used as modulation signals, and the frequency of the modulation signal is greater than the frequency of the oscillation signal at this time, and E1 and E2 are used as the first modulation sub-signal and the second modulation sub-signal respectively to drive the modulation circuit 120 to modulate the frequency characteristics of the carrier light signal output by the preset light source to obtain the target light signal.

[0091] On the other hand, if the oscillation signal is input to the mixer 111 from the first input port and the analog signal is input to the mixer 111 from the second input port, the signals output from the first output port and the second output port of the mixer 111 are E3 and E4, respectively, where:

[0092] E3=jE LO +E IF

[0093] =V LO cosω L t+V IF sinω I t

[0094] E4=E LO +jE IF

[0095] =V LO sinω L t+V IF cosω I t

[0096] It should be noted that E3 and E4 are used as modulation signals, and the frequency of the modulation signal is less than the frequency of the oscillation signal at this time, and E3 and E4 are used as the first modulation sub-signal and the second modulation sub-signal respectively to drive the modulation circuit 120 to modulate the frequency characteristics of the carrier light signal output by the preset light source to obtain the target light signal.

[0097] In the optical signal output module provided in the embodiment of the present application, the electro-optical modulator 121 is used to obtain a carrier optical signal, and modulate the carrier optical signal according to a modulation signal to obtain a target optical signal.

[0098] Exemplarily, the electro-optical modulator 121 is an In-phase / Quadrature Mach-Zehnder Modulator (IQ Mach-Zehnder Modulator), which corresponds to a preset light source setting and is used to modulate the carrier optical signal output by the preset light source into a target optical signal. It should be understood that for the same carrier optical signal, modulating with modulation signals with different signal characteristics can obtain target optical signals with different frequencies.

[0099] See also Figure 4 , Figure 4 A schematic diagram of the circuit structure of an electro-optic modulator in an optical signal output module provided in an embodiment of the present application.

[0100] like Figure 3 and Figure 4 As shown, in some embodiments, the mixer 111 has a first output port 1113 and a second output port 1114, the modulated signal includes a first modulated sub-signal and a second modulated sub-signal, and the mixer 111 is used to output the first modulated sub-signal through the first output port 1113 and output the second modulated sub-signal through the second output port 1114.

[0101] Accordingly, in some implementations, the electro-optic modulator 121 includes a branching unit 1213, a first sub-modulator 1211, a second sub-modulator 1212, and a branching unit 1213. The specific connection structure and function of each unit in the electro-optic modulator 121 are described below:

[0102] The branching unit 1213 corresponds to the preset laser light source setting, and is used to receive the carrier optical signal output by the laser light source, and decompose the carrier optical signal into a first branch optical signal and a second branch optical signal; the first sub-modulator 1211 is connected to the branching unit 1213 and the first output port 1113 of the mixer 111, and is used to modulate the first branch optical signal according to the first modulated sub-signal to obtain a first modulated optical signal; the second sub-modulator 1212 is connected to the branching unit 1213 and the second output port 1114 of the mixer 111, and is used to modulate the second branch optical signal according to the second modulated sub-signal to obtain a second modulated optical signal. The combining unit 1214 is connected to the first sub-modulator 1211 and the second sub-modulator 1212, and is used to combine the first modulated optical signal and the second modulated optical signal to obtain a target optical signal.

[0103] Exemplarily, the electro-optical modulator 121 is a dual parallel (In-phase / Quadrature Mach-Zehnder Modulator, IQ Mach-Zehnder modulator), then the electro-optical modulator 121 includes parallel upper and lower arms, and the electro-optical modulator 121 includes two sub-modulators, namely a first sub-modulator 1211 and a second sub-modulator 1212, and the two sub-modulators are respectively embedded in the upper and lower arms, wherein the first sub-modulator 1211 is used to modulate the first branch optical signal according to the first modulation sub-signal to obtain a first modulated optical signal, and the second sub-modulator 1212 is used to modulate the second branch optical signal according to the second modulation sub-signal to obtain a second modulated optical signal.

[0104] In some embodiments, the electro-optical modulator 121 also includes a phase shifter 1215, which is disposed on the branch where the first sub-modulator 1211 or the second sub-modulator 1212 is located, and is used to adjust the phases of the optical signals on the two branches so that the phase difference between the optical signals on the two branches remains at 90°.

[0105] For example, in the scenario where both the oscillating signal and the analog signal are input to the mixer circuit 110 from the first input port, it can be obtained from the above description that: E1 = V LO sinω L t+V IF sinω I t, E2 = V LO cosω L t+V IF cosω I t, E1 and E2 are used as the first modulation sub-signal and the second adjustment sub-signal to drive the electro-optic modulator. At the same time, the frequency of the carrier optical signal input to the electro-optic modulator is set to ω c , the branching unit equally divides the carrier optical signal to obtain a first branch optical signal and a second branch optical signal. After the first branch optical signal and the second branch optical signal are modulated by the first sub-modulator and the second sub-modulator respectively, the obtained first modulated optical signal and the second modulated optical signal can be expressed as:

[0106]

[0107]

[0108] in, E c ,ω c are the amplitude and frequency of the carrier optical signal, φ DC1 ,φ DC2 are the phase terms introduced by the bias voltages of the first and second sub-modulators, respectively. Applying the Bessel expansion, J nrepresents the nth-order first-kind Bessel function, where β1=πV LO / V π-1 , β2=πV IF / V π-1 ,β'1=πV LO / V π-2 , β2'=πV IF / V π-2 are the modulation depths of the oscillating signal and the analog signal in the first sub-modulator and the second sub-modulator, respectively, V π-1 、V π-2 are the half-wave voltages of the first sub-modulator and the second sub-modulator respectively. By adjusting the DC bias voltage of the first sub-modulator and the second sub-modulator to make them work at the minimum transmission point, that is, φ DC1 =φ DC2 =π, then the target optical signal output by the modulation circuit 120 can be expressed as:

[0109]

[0110] Considering small signal modulation, the high-order sidebands can be ignored, so the above formula can be simplified to:

[0111]

[0112] See also Figure 5 , Figure 5 A schematic diagram of the frequency characteristics of a target optical signal output by a modulation circuit in an optical signal output module and a radio frequency signal acquired by an antenna transmission module provided in an embodiment of the present application.

[0113] like Figure 5 (a) As shown in the expression of the target optical signal above, when the oscillation signal and the analog signal are both input into the mixer circuit 110 from the first input port, the target optical signal output by the modulation circuit 120 includes a frequency of ω c +ω I The first sideband signal and the frequency are ω c +ω L The second sideband signal.

[0114] It can be seen that at this time, the spectrum of the target optical signal output by the modulation circuit 120 is composed of the carrier optical signal and the 1st-order sidebands symmetrically distributed on both sides of the carrier optical signal, wherein the -1st-order sidebands of the carrier optical signal, the oscillation signal and the analog signal are greatly suppressed by the target optical signal, and only the +1st-order sidebands of the analog signal and the oscillation signal are included. Thus, the modulation circuit 120 completes the carrier suppressed single sideband modulation on the same side, and the target optical signal output by the modulation circuit 120 is a carrier suppressed single sideband signal.

[0115] Similarly, in the scenario where the oscillating signal is input from the first input port to the mixer circuit 110 and the analog signal is input from the second input port to the mixer circuit 110, it can be obtained from the above description that if E3=V LO cosω L t+V IF sinω I t, E4 = V LO sinω L t+V IF cosω I t, the target optical signal output by the modulation circuit 120 can be expressed as:

[0116]

[0117] like Figure 5 (b) As shown in the expression of the target optical signal above, when the oscillation signal and the analog signal are both input into the mixer circuit 110 from the first input port, the target optical signal output by the modulation circuit 120 includes a frequency of ω c +ω I The third sideband signal and the frequency are ω c -ω L The fourth sideband signal.

[0118] It can be seen that at this time, the spectrum of the carrier optical signal output by the modulation circuit 120 consists of the carrier optical signal and the 1st-order sidebands symmetrically distributed on both sides of the carrier optical signal, wherein the carrier optical signal, the +1st-order sideband of the oscillation signal and the -1st-order sideband of the analog signal are greatly suppressed, and the target optical signal only includes the +1st-order sideband of the analog signal and the oscillation signal. Thus, the modulation circuit 120 completes the carrier suppressed single sideband modulation on different sides, and the target optical signal output by the modulation circuit 120 is a carrier suppressed single sideband signal.

[0119] Furthermore, the antenna transmitting module 200 includes a UTC-PD (Uni Travelling Carrier PhotoDiode), and the transmission circuit 130 acquires the target optical signal and transmits the target optical signal to the antenna transmitting module 200, and the UTC-PD of the antenna transmitting module 200 performs photoelectric detection on the target optical signal.

[0120] Exemplarily, when the oscillating signal and the analog signal are simultaneously input into the mixer 111 from the first input port (ie, the first mixing mode), the target optical signal output by the modulation circuit 120 includes a frequency of ω c +ω I The first sideband signal and the frequency are ω c +ω LDue to the frequency beat between the first sideband signal and the second sideband signal, the antenna transmitting module 200 can generate a frequency of ω by photoelectric detection. L -ω I LSB (Lower Side band) signal.

[0121] On the contrary, when the oscillating signal is input to the mixer 111 from the first input port and the analog signal is input to the mixer 111 from the second input port (ie, the second mixing mode), the target optical signal output by the modulation circuit 120 includes a frequency of ω c +ω I The third sideband signal and the frequency are ω c -ω L Due to the frequency beat between the third sideband signal and the fourth sideband signal, the antenna transmitting module 200 performs photoelectric detection to generate a frequency of ω L +ω I USB (Upper Side band) signal.

[0122] It can be seen from the above two different target optical signals that by switching the oscillation signal input to the input port of the mixer 111, the modulation sideband (+1 order / -1 order) of the oscillation signal in the optical domain can be freely selected, thereby realizing the optical up or down conversion of the microwave frequency, thereby quickly, directly and easily adjusting the frequency characteristics of the target optical signal output by the optical signal output module 100, and the optical signal output module 100 with a small volume structure is compatible with the output of optical signals of different frequencies, thereby effectively realizing the cross-band multi-frequency fusion of optical signals.

[0123] like Figure 2 As shown, in some embodiments, the optical signal output module 100 also includes an amplifying circuit 140 , which is connected between the modulation circuit 120 and the transmission circuit 130 , and is used to amplify the target optical signal and transmit the amplified target optical signal to the transmission circuit 130 .

[0124] It should be noted that an amplifier circuit 140 is provided on one side of the optical signal output module 100 to amplify the target optical signal, in order to ensure that the target optical signal has sufficient optical power to pass through the transmission circuit 130 and be transmitted to the antenna transmission module 200 for further processing.

[0125] For example, the antenna transmission module 200 includes a UTC-PD (Uni Travelling Carrier PhotoDiode), which is used to perform photoelectric detection on the target optical signal sent in to obtain a radio frequency signal. By setting an amplifier circuit 140 on one side of the optical signal output module 100, it is ensured that the signal entering the UTC-PD has sufficient optical power to generate a high-power radio frequency signal. Therefore, the obtained radio frequency signal does not require additional DSP (Digital Signal Processing) compensation, and the radio frequency signal does not require power amplification and filtering processing and can be directly transmitted through the antenna transmission module 200.

[0126] like Figure 2 As shown, in some embodiments, the transmission circuit 130 includes a standard single mode fiber (SSMF), wherein one end of the standard single mode fiber is connected to the amplification circuit 140, and the other end is connected to the antenna transmission module 200, for transmitting the target optical signal to the antenna transmission module 200.

[0127] See also Figure 6 , Figure 6 A schematic flow chart of an optical signal output method provided in an embodiment of the present application.

[0128] like Figure 6 As shown, the embodiment of the present application further provides an optical signal output method, which is applied to any optical signal output module 100 provided in the specification of the present application. The optical signal output method specifically includes S1 to S3:

[0129] S1: Acquire a target radio frequency frequency and a frequency of an oscillation signal, wherein the target radio frequency frequency is an expected frequency of a radio frequency signal generated by an antenna transmitting module in response to an optical signal output module outputting a target optical signal;

[0130] S2: Controlling the switch in the optical signal output module to switch the mixing mode of the mixer according to the target RF frequency and the frequency of the oscillation signal;

[0131] S3: Control the optical signal output module to generate a target optical signal based on the mixing mode of the mixer, and transmit the target optical signal to the antenna transmission module.

[0132] Specifically, when executing this method, the optical signal output module 100 first obtains the target RF frequency and the frequency of the oscillation signal, wherein the target RF frequency is the expected frequency of the RF signal generated by the antenna transmitting module 200 in response to the target optical signal output by the optical signal output module 100, and then controls the switching switch 112 in the optical signal output module 100 to switch the mixing mode of the mixer 111 according to the target RF frequency and the frequency of the oscillation signal, and then controls the optical signal output module 100 to generate the target optical signal based on the mixing mode of the mixer 111, and transmits the target optical signal to the antenna transmitting module 200.

[0133] It should be understood that the switching mode of the mixer is switched by controlling the switching switch in the optical signal output module according to the target RF frequency and the frequency of the oscillation signal, so that: after the target optical signal is transmitted to the antenna transmitting module 200, the frequency of the RF signal generated by the antenna transmitting module 200 in response to the optical signal output module 100 outputting the target optical signal is equal to the target RF frequency, or the difference between the frequency of the RF signal and the target RF frequency is less than a preset threshold.

[0134] It should be noted that when the frequencies of the oscillation signal and the analog signal are fixed, the switching switch 112 can determine the mixing mode corresponding to the mixer 111. For the same oscillation signal and the same analog signal, the signal characteristics of the first type of modulation signal obtained based on the first mixing mode and the second type of modulation signal obtained based on the second mixing mode are different. Therefore, it is necessary to control the switching switch 112 to switch the mixing mode of the mixer 111 according to the target RF frequency and the frequency of the oscillation signal, so that the RF signal frequency corresponding to the target optical signal is close to the target RF frequency value, thereby matching the target optical signal with the target RF frequency.

[0135] In some implementations, the mixer 111 has a first input port 1111 and a second input port 1112 , and the switch 112 is connected to the first input port 1111 and the second input port 1112 and is used to switch the input port to which the oscillation signal and / or the analog signal is input.

[0136] Accordingly, controlling the switch in the optical signal output module to switch the mixing mode of the mixer according to the target radio frequency and the frequency of the oscillation signal includes:

[0137] If the frequency of the target RF signal is lower than the frequency of the oscillation signal, a first switching operation is performed on the switch 112 so that the oscillation signal and the analog signal are controlled to be input into the mixer from the same input port;

[0138] If the frequency of the target RF signal is greater than or equal to the frequency of the oscillating signal, a second switching operation is performed on the switch 112 so that the oscillating signal and the analog signal are respectively input into the mixer from different input ports.

[0139] Specifically, if the frequency of the target RF signal is less than the frequency of the oscillation signal, the first switching operation is performed on the switching switch 112 to control the oscillation signal and the analog signal to be input into the mixer from the same input port, and the switching switch 112 switches the mixer 111 to the first mixing mode. Similarly, if the frequency of the target RF signal is greater than or equal to the frequency of the oscillation signal, the second switching operation is performed on the switching switch 112 to control the oscillation signal and the analog signal to be input into the mixer from different input ports, respectively, and the switching switch 112 switches the mixer 111 to the second mixing mode. The switching switch 112 is controlled by the above-mentioned judgment method to switch the mixer 111 between the two mixing modes, so that the RF signal frequency corresponding to the target optical signal is close to the target RF frequency value.

[0140] In some embodiments, under the condition that the oscillating signal and the analog signal are input to the mixer 111 from the same input port, the frequency of the radio frequency signal generated by the antenna transmission module 200 is the difference between the frequencies of the oscillating signal and the analog signal;

[0141] Under the condition that the oscillation signal and the analog signal are respectively input into the mixer 111 from different input ports, the frequency of the radio frequency signal generated by the antenna transmission module 200 is the sum of the frequencies of the oscillation signal and the analog signal.

[0142] It should be noted that when the frequency of the oscillation signal input to the mixer 111 is ω L , the frequency of the analog signal input to the mixer 111 is ω I Under the condition of , when the oscillation signal and the analog signal are simultaneously input into the mixer 111 from the first input port 1111 (ie, the first mixing mode), the target optical signal output by the modulation circuit 120 includes a frequency of ω c +ω I The first sideband signal and the frequency are ω c +ω L The antenna transmitting module 200 performs photoelectric detection to generate a second sideband signal with a frequency of ω L -ω I When the oscillation signal is input to the mixer 111 from the first input port 1111 and the analog signal is input to the mixer 111 from the second input port 1112 (i.e., the second mixing mode), the target optical signal output by the modulation circuit 120 includes a frequency of ω c +ω I The third sideband signal and the frequency are ω c -ω L Due to the frequency beat between the third sideband signal and the fourth sideband signal, the antenna transmitting module 200 performs photoelectric detection to generate a frequency of ω L +ωI USB (Upper Sideband) signal.

[0143] Based on this, under the condition that the oscillation signal and the analog signal are input into the mixer 111 from the same input port, the frequency of the radio frequency signal generated by the antenna transmission module 200 is the difference between the frequencies of the oscillation signal and the analog signal;

[0144] Under the condition that the oscillation signal and the analog signal are respectively input into the mixer 111 from different input ports, the frequency of the radio frequency signal generated by the antenna transmission module 200 is the sum of the frequencies of the oscillation signal and the analog signal.

[0145] In some implementations, before controlling the optical signal output module 100 to generate the target optical signal based on the mixing mode of the mixer 111, the method further includes:

[0146] The frequency of the analog signal is adjusted according to the difference between the frequency of the oscillation signal and the target radio frequency.

[0147] It should be noted that in addition to adjusting the mixing mode of the mixing circuit 110, the frequency characteristics of the target optical signal can also be adjusted by adjusting the analog signal, thereby increasing the flexibility of optical signal adjustment. The optical signal output module 100 with a small volume can output optical signals of different frequencies compatibly, effectively realizing cross-band multi-frequency fusion of optical signals.

[0148] It should also be noted that, in the first mixing mode, the antenna transmitting module 200 generates a frequency of ω L -ω I In the second mixing mode, the antenna transmitting module 200 generates a LSB signal with a frequency of ω L +ω I Therefore, the frequency of the analog signal can be adjusted according to the difference between the frequency of the oscillation signal and the target RF frequency. For example, the frequency of the analog signal can be adjusted to the difference between the frequency of the oscillation signal and the target RF frequency, so that the target optical signal and the RF signal match the target RF frequency.

[0149] See also Figure 1 The embodiment of the present application also provides an antenna transmitting module 200, which is used to adapt to any optical signal output module 100 provided in the specification of the present application. The antenna transmitting module 200 is used to perform photoelectric detection on the target optical signal output by the optical signal output module 100 to generate a radio frequency signal, and the frequency of the radio frequency signal is related to the frequency characteristics of the target optical signal.

[0150] In some embodiments, the antenna transmitting module 200 includes a UTC-PD (Uni Travelling Carrier Photo Diode), the transmission circuit 130 acquires the target light signal and transmits the target light signal to the antenna transmitting module 200, and the UTC-PD of the antenna transmitting module 200 performs photoelectric detection on the target light signal.

[0151] Exemplarily, when the oscillating signal and the analog signal are simultaneously input into the mixer 111 from the first input port (ie, the first mixing mode), the target optical signal output by the modulation circuit 120 includes a frequency of ω c +ω I The first sideband signal and the frequency are ω c +ω L Due to the frequency beat between the first sideband signal and the second sideband signal, the antenna transmitting module 200 can generate a frequency of ω by photoelectric detection. L -ω I On the contrary, when the oscillating signal is input to the mixer 111 from the first input port and the analog signal is input to the mixer 111 from the second input port (i.e., the second mixing mode), the target optical signal output by the modulation circuit 120 includes a frequency of ω c +ω I The third sideband signal and the frequency are ω c -ω L Due to the frequency beat between the third sideband signal and the fourth sideband signal, the antenna transmitting module 200 performs photoelectric detection to generate a frequency of ω L +ω I USB signal.

[0152] See also Figure 7 , Figure 7 A schematic block diagram of the structure of a radio frequency system provided in an embodiment of the present application.

[0153] like Figure 7 As shown, the embodiment of the present application further provides a radio frequency system 1, which includes an optical signal output module 100 and an antenna transmission module 200 connected to the optical signal output module 100. The optical signal output module 100 is any optical signal output module 100 provided in the specification of the present application, and the antenna transmission module 200 is used to perform photoelectric detection on the target optical signal output by the optical signal output module 100 to generate a radio frequency signal.

[0154] It should be understood that in the RF system 1 provided in the embodiment of the present application, the mutual adaptation and operating principle of the optical signal output module 100 and the antenna transmission module 200 can be found in the description of the above-mentioned optical signal output module 100 and the antenna transmission module 200, and will not be repeated here.

[0155] Those skilled in the art will understand that Figure 1 and Figure 7 The structure shown is merely a block diagram of a portion of the structure related to the embodiment of the present application, and does not constitute a limitation on the optical signal output module 100, the antenna transmission module 200 and the radio frequency system 1 in the embodiment of the present application. The specific optical signal output module 100, the antenna transmission module 200 and the radio frequency system 1 may include more or fewer components than shown in the figure, or combine certain components, or have a different arrangement of components.

[0156] In summary, the embodiments of the present application provide an optical signal output module, an output method, an antenna transmitting module and a radio frequency system. The optical signal output module provided in the embodiments of the present application is used to adapt to the antenna transmitting module, and the optical signal output module includes: a mixing circuit, which is provided with a mixer and a switching switch connected to the mixer, the switching switch is connected to the mixer and determines the mixing mode corresponding to the mixer, and the mixer mixes the switching oscillation signal and / or the analog signal transmitted by the switching switch based on the mixing mode to obtain a modulated signal; a modulation circuit, which is provided with an electro-optical modulator, and the electro-optical modulator is connected to the mixer, and is used to modulate the modulated signal output by the mixer and the received carrier optical signal into a target optical signal; a transmission circuit, which is connected between the modulation circuit and the antenna transmitting module, and is used to transmit the target optical signal to the antenna transmitting module, so that the antenna transmitting module performs photoelectric detection on the target optical signal to generate an radio frequency signal. Based on connecting the switching switch with the mixer and determining the mixing mode corresponding to the mixer, so that the mixer mixes the oscillation signal and the analog signal under the mixing mode, the frequency characteristics of the target optical signal output by the optical signal output module and the radio frequency signal detected by the antenna transmission module can be adjusted quickly, directly and easily, so that optical signals of different frequencies can be output compatibly with a small-volume optical signal output module structure, effectively realizing cross-band multi-frequency fusion of optical signals.

[0157] It will be appreciated by those skilled in the art that all or some of the steps, systems, and functional modules / units in the methods disclosed above may be implemented as software, firmware, hardware, and appropriate combinations thereof. In a hardware embodiment, the division between the functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed by several physical components in cooperation. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or temporary medium). As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, it is well known to those of ordinary skill in the art that communication media typically contain computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0158] It should be understood that the term "and / or" used in the present specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, including these combinations. It should be noted that, in this article, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "including a..." does not exclude the presence of other identical elements in the process, method, article or system including the element.

[0159] The serial numbers of the embodiments of the present application are only for description and do not represent the advantages and disadvantages of the embodiments. The above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. An optical signal output module, adapted to an antenna transmission module, characterized in that: The optical signal output module comprises: A mixing circuit, comprising a mixer and a switching switch connected to the mixer, wherein the switching switch is connected to the mixer and determines a mixing mode corresponding to the mixer, and the mixer performs mixing processing on a switching oscillation signal and / or an analog signal transmitted by the switching switch based on the mixing mode to obtain a modulated signal; a modulation circuit, provided with an electro-optical modulator, the electro-optical modulator being connected to the mixer and being used for modulating the modulation signal output by the mixer and the received carrier optical signal into a target optical signal; The transmission circuit is connected between the modulation circuit and the antenna transmission module, and is used to transmit the target optical signal to the antenna transmission module, so that the antenna transmission module performs photoelectric detection on the target optical signal to generate a radio frequency signal.

2. The optical signal output module according to claim 1, characterized in that: The mixer has a first input port and a second input port, the switch is connected to the first input port and the second input port, and is used to switch the oscillation signal and / or the analog signal to be input to the input port of the mixer; The switching switch is connected to the mixer and determining the mixing mode corresponding to the mixer includes: When the oscillation signal and the analog signal are input to the mixer from the same input port, the mixer performs mixing processing on the oscillation signal and the analog signal in a first mixing mode, wherein the first mixing mode is an up-conversion processing on the oscillation signal; When the oscillation signal and the analog signal are input to the mixer from different input ports respectively, the mixer mixes the oscillation signal and the analog signal in a second mixing mode, where the second mixing mode is a down-conversion process on the oscillation signal.

3. The optical signal output module according to claim 2, characterized in that: The switching switch comprises an input end, a first output end and a second output end, wherein the first output end of the switching switch is connected to the first input port of the mixer, the second output end of the switching switch is connected to the second input port of the mixer, the input end of the switching switch is used to receive the oscillation signal, and the switching switch is used to switch its input end to be connected to the first output end or the second output end; The mixer is used for fixedly receiving the analog signal through one of the first input port and the second input port.

4. The optical signal output module according to claim 1, characterized in that: The mixer has a first output port and a second output port, the modulated signal includes a first modulated sub-signal and a second modulated sub-signal, and the mixer is used to output the first modulated sub-signal through the first output port and output the second modulated sub-signal through the second output port.

5. The optical signal output module according to claim 4, characterized in that: The electro-optic modulator comprises: A branching unit, used for receiving the carrier optical signal output by the laser light source, and decomposing the carrier optical signal into a first branch optical signal and a second branch optical signal; A first sub-modulator, the first sub-modulator is connected to the branch unit and the first output port of the mixer, and is used to modulate the first branch optical signal according to the first modulated sub-signal to obtain a first modulated optical signal; A second sub-modulator is connected to the branching unit and the second output port of the mixer, and is used for modulating the second branch optical signal according to the second modulated sub-signal to obtain a second modulated optical signal. A combining unit is connected to the first sub-modulator and the second sub-modulator, and is used to combine the first modulated optical signal and the second modulated optical signal to obtain the target optical signal.

6. The optical signal output module according to any one of claims 1 to 5, characterized in that: The optical signal output module also includes an amplifier circuit, which is connected between the modulation circuit and the transmission circuit and is used to amplify the target optical signal and transmit the amplified target optical signal to the transmission circuit.

7. The optical signal output module according to any one of claims 1 to 5, characterized in that: The optical signal output module also includes an analog signal output circuit, which is connected to the frequency mixing circuit and is used to output the analog signal to the frequency mixing circuit, and the frequency of the analog signal is adjustable.

8. An optical signal output method, applied to the optical signal output module according to any one of claims 1 to 7, characterized in that: The method comprises: Acquire a target radio frequency frequency and a frequency of the oscillation signal, wherein the target radio frequency frequency is an expected frequency of a radio frequency signal generated by the antenna transmitting module in response to the optical signal output module outputting a target optical signal; Controlling a switch in the optical signal output module to switch a mixing mode of the mixer according to the target radio frequency and the frequency of the oscillation signal; The optical signal output module is controlled to generate a target optical signal based on the mixing mode of the mixer, and the target optical signal is transmitted to the antenna transmission module.

9. The optical signal output method according to claim 8, characterized in that: The mixer has a first input port and a second input port, the switch is connected to the first input port and the second input port, and is used to switch the oscillation signal and / or the analog signal to be input to the input port; the switching mode of the mixer is switched by controlling the switch in the optical signal output module according to the target RF frequency and the frequency of the oscillation signal, including: If the frequency of the target RF signal is lower than the frequency of the oscillation signal, performing a first switching operation on the switch to control the oscillation signal and the analog signal to be input into the mixer from the same input port; If the frequency of the target RF signal is greater than or equal to the frequency of the oscillation signal, a second switching operation is performed on the switch so that the oscillation signal and the analog signal are respectively input into the mixer from different input ports.

10. The optical signal output method according to claim 9, characterized in that: Under the condition that the oscillation signal and the analog signal are input into the mixer from the same input port, the frequency of the radio frequency signal generated by the antenna transmission module is the difference between the frequencies of the oscillation signal and the analog signal; Under the condition that the oscillation signal and the analog signal are respectively input into the mixer from different input ports, the frequency of the radio frequency signal generated by the antenna transmission module is the sum of the frequencies of the oscillation signal and the analog signal.

11. The optical signal output method according to claim 9, characterized in that: Before controlling the optical signal output module to generate a target optical signal based on the mixing mode of the mixer, the method further includes: The frequency of the analog signal is adjusted according to the difference between the frequency of the oscillation signal and the target radio frequency.

12. An antenna transmission module, adapted to be compatible with the optical signal output module according to any one of claims 1 to 7, characterized in that: The antenna transmission module is used to perform photoelectric detection on the target optical signal output by the optical signal output module to generate a radio frequency signal, and the frequency of the radio frequency signal is related to the frequency characteristics of the target optical signal.

13. A radio frequency system, characterized in that: The radio frequency system comprises: The optical signal output module according to any one of claims 1 to 7; The antenna transmitting module is connected to the optical signal output module and is used for performing photoelectric detection on the target optical signal output by the optical signal output module to generate a radio frequency signal, wherein the frequency of the radio frequency signal is related to the frequency characteristic of the target optical signal.

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