Digital-analog hybrid fiber system and optical terminal

Abstract

The utility model provides a kind of digital analog hybrid fiber system and optical terminal, signal sending device in the digital analog hybrid fiber system is connected with signal receiving device by at least one single-mode fiber;Signal sending device is used to receive radio frequency electrical signal, video electrical signal and general data electrical signal, and radio frequency electrical signal, video electrical signal and general data electrical signal are converted into radio frequency optical signal, video optical signal and general data optical signal;Signal sending device is also used to mix at least two optical signals in radio frequency optical signal, video optical signal and general data optical signal after processing, and optical signal is sent to signal receiving device by corresponding single-mode fiber;Signal receiving device is used to convert received optical signal into radio frequency electrical signal, video electrical signal and general data electrical signal and then transmit to outside. Thus the digital analog hybrid fiber system can meet the scene of mixed function demand and interface complex diversification demand.

Description

Technical Field

[0001] This utility model relates to the field of optical fiber communication technology, and in particular to a digital-analog hybrid optical fiber system and an optical transceiver. Background Technology

[0002] Traditional fiber optic systems are limited in function and interface, only capable of transmitting one type of electrical signal. They struggle to meet the demands of scenarios with mixed functionalities and complex, diverse interface requirements. For example, in environments with special electromagnetic interference and complex long-distance transmission, such as microwave anechoic chambers and large aircraft testing and commissioning, multiple fiber optic systems are necessary to support the transmission of various electrical signals. Therefore, this type of fiber optic system still requires improvement. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of existing optical fiber systems, which can only realize the transmission of one type of electrical signal and are difficult to meet the needs of mixed functions and complex and diverse interfaces. This invention provides a digital-analog hybrid optical fiber system and an optical transceiver.

[0004] The present invention solves the above-mentioned technical problems through the following technical solution:

[0005] In a first aspect, a hybrid digital-analog fiber optic system is provided, the hybrid digital-analog fiber optic system comprising a signal transmitting device and a signal receiving device; the signal transmitting device and the signal receiving device are connected via at least one single-mode fiber.

[0006] The signal transmitting device is used to receive radio frequency electrical signals, video electrical signals and general data electrical signals, and to convert the radio frequency electrical signals, the video electrical signals and the general data electrical signals into radio frequency optical signals, video optical signals and general data optical signals;

[0007] The signal transmitting device is further configured to mix at least two of the radio frequency optical signal, the video optical signal and the general data optical signal to obtain a first mixed optical signal, and transmit all the optical signals to the signal receiving device through the corresponding single-mode optical fiber.

[0008] The signal receiving device is used to convert the received optical signal into the radio frequency electrical signal, the video electrical signal, and the general data electrical signal before transmitting them to the outside.

[0009] Optionally, the signal transmitting device includes a first controller, a first photoelectric conversion device, and a first optical signal processing device;

[0010] The first controller is electrically connected to the first photoelectric conversion device and the first optical signal processing device, respectively;

[0011] The output terminal of the first photoelectric conversion device is electrically connected to the input terminal of the first optical signal processing device;

[0012] The output of the first optical signal processing device is connected to the signal receiving device through at least one of the single-mode optical fibers;

[0013] The input terminal of the first photoelectric conversion device is used to receive the externally input radio frequency electrical signal, the video electrical signal, and the general data electrical signal;

[0014] The first controller is also configured to control the first photoelectric conversion device to convert the radio frequency electrical signal, the video electrical signal and the general data electrical signal into the radio frequency optical signal, the video optical signal and the general data optical signal, and then send them to the first optical signal processing device;

[0015] The controller is also configured to control the first optical signal processing device to mix at least two of the radio frequency optical signal, the video optical signal, and the general data optical signal to obtain a first mixed optical signal, and to send all the optical signals to the signal receiving device through the corresponding single-mode optical fiber.

[0016] Optionally, the signal transmitting device and the signal receiving device are connected via two single-mode optical fibers;

[0017] The first controller is further configured to control the first optical signal processing device to mix the video optical signal and the general data optical signal to obtain the first mixed optical signal, and to send the first mixed optical signal and the radio frequency optical signal to the signal receiving device through one of the single-mode optical fibers respectively;

[0018] or,

[0019] The signal transmitting device and the signal receiving device are connected via one of the single-mode optical fibers;

[0020] The first controller is further configured to control the first optical signal processing device to mix the radio frequency optical signal, the video optical signal and the general data optical signal to obtain the first mixed optical signal, and to send the first mixed optical signal to the signal receiving device through one of the single-mode optical fibers.

[0021] Optionally, the signal receiving device includes a second controller, a second photoelectric conversion device, and a second optical signal processing device;

[0022] The second controller is electrically connected to the second photoelectric conversion device and the second optical signal processing device, respectively;

[0023] The input terminal of the second optical signal processing device is connected to the signal transmitting device via at least one of the single-mode optical fibers;

[0024] The output terminal of the second optical signal processing device is electrically connected to the input terminal of the second photoelectric conversion device;

[0025] The second controller is also used to control the second optical signal processing device to convert the received optical signal into the radio frequency optical signal, the video optical signal, and the general data optical signal, and then send them to the second photoelectric conversion device;

[0026] The second controller also controls the second photoelectric conversion device to convert the radio frequency optical signal, the video optical signal, and the general data optical signal into the radio frequency electrical signal, the video electrical signal, and the general data electrical signal, and then send them to the outside.

[0027] Optionally, the signal transmitting device includes a first controller and a multiplexing selector;

[0028] The first controller is electrically connected to the multiplexer;

[0029] The first controller is used to control the multiplexing selector to select the corresponding multiplexing technology according to the decision parameters, so as to convert the radio frequency electrical signal, the video electrical signal and the general data electrical signal into radio frequency optical signal, video optical signal and general data optical signal; wherein, the decision parameters include at least one of the following: current traffic load, signal delay sensitivity, signal bandwidth, single-mode fiber resource utilization, signal transmission speed and signal service quality.

[0030] Optionally,

[0031] In response to the first bandwidth of the video electrical signal and the general data electrical signal being greater than or equal to a first bandwidth threshold, the controller controls the multiplexing selector to select spatial multiplexing technology to process the video electrical signal and the general data electrical signal to obtain the video optical signal and the general data optical signal;

[0032] In response to the speed of the video electrical signal and the general data electrical signal being less than or equal to a speed threshold, the first controller controls the multiplexing selector to select time-division multiplexing technology to process the video electrical signal and the general data electrical signal to obtain the video optical signal and the general data optical signal;

[0033] In response to the second bandwidth of the radio frequency electrical signal being greater than or equal to a second bandwidth threshold, the controller controls the multiplexing selector to select either subcarrier multiplexing technology or orthogonal frequency division multiplexing technology to process the radio frequency electrical signal in order to obtain the radio frequency optical signal;

[0034] Wherein, the first bandwidth threshold is greater than the second bandwidth threshold.

[0035] Optionally, the signal receiving device includes a second controller and a demultiplexing selector;

[0036] The second controller is electrically connected to the demultiplexing selector;

[0037] The second controller is used to control the demultiplexing selector to select the corresponding demultiplexing technology for processing based on the received multiplexed radio frequency optical signal, video optical signal and general data optical signal, so as to obtain the radio frequency electrical signal, video electrical signal and general data electrical signal.

[0038] Optionally, the signal transmitting device includes a first controller and a first low-noise amplifier;

[0039] The first low-noise amplifier is electrically connected to the first controller;

[0040] The first controller is also used to control the opening and closing of the first low-noise amplifier in order to control the noise of the radio frequency electrical signal in the signal transmitting device;

[0041] and / or;

[0042] The signal receiving device includes a second controller and a second low-noise amplifier;

[0043] The second low-noise amplifier is electrically connected to the first controller;

[0044] The second controller is also used to control the opening and closing of the second low-noise amplifier in order to control the noise of the radio frequency electrical signal in the signal receiving device.

[0045] Optionally, the signal transmitting device includes a first controller and a first temperature sensor;

[0046] The first temperature sensor is electrically connected to the first controller;

[0047] The first temperature sensor is used to acquire the first temperature inside the signal transmitting device;

[0048] The first controller is also configured to control the first temperature sensor to send the first temperature to the first controller;

[0049] and / or;

[0050] The signal receiving device includes a second controller and a second temperature sensor;

[0051] The second temperature sensor is electrically connected to the second controller;

[0052] The second temperature sensor is used to acquire a second temperature within the signal receiving device;

[0053] The second controller is also used to control the second temperature sensor to send the second temperature to the second controller.

[0054] Optionally, the signal transmitting device includes a first analog channel and a first digital channel; the signal receiving device includes a second analog channel and a second digital channel.

[0055] The first analog channel and the second analog channel are used to transmit the radio frequency electrical signal; the first digital channel and the second digital channel are used to transmit the video electrical signal and the general data electrical signal;

[0056] The signal transmitting device transmits the radio frequency test electrical signal to the second analog channel through the first analog channel;

[0057] The signal transmitting device transmits the initial signal parameters of the radio frequency test electrical signal to the second digital channel through the first digital channel;

[0058] The signal receiving device is further configured to acquire the actual signal parameters of the radio frequency test electrical signal in the second analog channel and the initial signal parameters in the second digital channel, and evaluate the transmission quality of the radio frequency test electrical signal based on the actual signal parameters and the initial signal parameters;

[0059] The signal receiving device is further configured to generate a control command based on the transmission quality, and send the control command to the first digital channel through the second digital channel;

[0060] The signal transmitting device is further configured to acquire the control command in the first digital channel and control the initial signal parameters of the radio frequency test electrical signal according to the control command.

[0061] Secondly, an optical transceiver includes a chassis for integrating the aforementioned hybrid digital-analog fiber optic system;

[0062] The chassis is also equipped with a radio frequency interface, a video interface, a general data interface, and at least one pair of fiber optic interfaces for receiving and transmitting corresponding signals.

[0063] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of this utility model.

[0064] The positive and progressive effects of this utility model are as follows: the signal transmitting device in the digital-analog hybrid optical fiber system can mix and process at least two of the following optical signals: radio frequency optical signal, video optical signal, and general data optical signal, and then send them to the signal receiving device. The signal receiving device then converts the received optical signal into radio frequency electrical signal, video electrical signal, and general data electrical signal and transmits them to the outside. In this way, the digital-analog hybrid optical fiber system can meet the transmission of radio frequency electrical signal, video electrical signal, and general data electrical signal, and thus meet the needs of scenarios with mixed functions and complex and diverse interfaces. Attached Figure Description

[0065] Figure 1 This is a schematic diagram of a digital-analog hybrid fiber optic system provided in Embodiment 1 of this utility model;

[0066] Figure 2 This is a schematic diagram of a digital-analog hybrid optical fiber system using a single-mode optical fiber for transmission, provided in Embodiment 1 of this utility model.

[0067] Figure 3 This is a schematic diagram of a digital-analog hybrid optical fiber system using two single-mode optical fibers for transmission, provided in Embodiment 1 of this utility model.

[0068] Figure 4 A control flowchart for a digital-analog hybrid fiber optic system provided in Embodiment 1 of this utility model;

[0069] Figure 5 This is a schematic diagram of control and adjustment in a digital-analog hybrid fiber optic system provided in Embodiment 1 of this utility model;

[0070] Figure 6 A schematic diagram of the signal transmitting end of an optical transceiver provided in Embodiment 2 of this utility model;

[0071] Figure 7 This is a schematic diagram of a signal receiving end of an optical transceiver provided in Embodiment 2 of this utility model. Detailed Implementation

[0072] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0073] In this embodiment of the invention, prefixes such as "first" and "second" are used merely to distinguish different descriptive objects and do not limit the position, order, priority, quantity, or content of the described objects. The use of ordinal numbers and other prefixes to distinguish descriptive objects in this embodiment of the invention does not constitute a limitation on the described objects. The description of the described objects is given in the context of the embodiments, and the use of such prefixes should not constitute unnecessary restrictions. Furthermore, in the description of this embodiment, unless otherwise stated, "multiple" means two or more.

[0074] Example 1

[0075] In order to enable fiber optic systems to meet the needs of hybrid functions and complex and diverse interfaces, Embodiment 1 of this utility model provides a digital-analog hybrid fiber optic system. Figure 1 This is a schematic diagram of a digital-analog hybrid optical fiber system provided in Embodiment 1 of the present invention. The digital-analog hybrid optical fiber system includes a signal transmitting device 11 and a signal receiving device 12; the signal transmitting device 11 and the signal receiving device 12 are connected through at least one single-mode optical fiber.

[0076] The single-mode fiber can be at least one of the following: MPO (Multi-fiber Push On) single-mode fiber, FC / APC (Ferrule Connector / Angled Physical Contact) single-mode fiber, or SC / APC (Subscriber Connector / Angled Physical Contact) single-mode fiber. The specific choice of single-mode fiber can be determined according to the actual situation.

[0077] The signal transmitting device 11 is used to receive radio frequency electrical signals, video electrical signals and general data electrical signals, and convert the radio frequency electrical signals, video electrical signals and general data electrical signals into radio frequency optical signals, video optical signals and general data optical signals.

[0078] The radio frequency (RF) signal can be an analog RF signal of 0–6.0 GHz (GHz) or 67 GHz (GHz). The video signal can be an HDMI (High Definition Multimedia Interface) signal or a DP (DisplayPort) signal of 18–20 Gbps (gigabits per second). The video signal can be an uncompressed, latency-free 4K@60Hz resolution 4:4:4 video signal.

[0079] The signal transmitting device 11 is also used to mix at least two optical signals from the radio frequency optical signal, video optical signal, and general data optical signal to obtain a first mixed optical signal, and transmit the optical signal to the signal receiving device 12 through the corresponding single-mode optical fiber. The digital signal can be a medium-speed (less than 40 Mbps, megabits per second) Ethernet signal and various low-speed serial signals, such as RS232 interface signals, RS485 interface signals, and USB interface signals.

[0080] The signal receiving device 12 is used to convert the received optical signal into radio frequency electrical signal, video electrical signal and general data electrical signal and then transmit it to the outside.

[0081] It should be noted that the signal receiving device 12 may include a signal classification and preprocessing unit, which can automatically identify the signal type and classify and preprocess the signal according to the signal type. This preprocessing includes: ADC (Analog-to-Digital Converter) sampling, digital encoding, or protocol encapsulation of the signal. The method for automatically identifying the signal type using the signal classification and preprocessing unit is existing technology and will not be elaborated upon here.

[0082] In this embodiment, the signal transmitting device 11 in the digital-analog hybrid optical fiber system can mix and process at least two of the following optical signals: radio frequency optical signal, video optical signal, and general data optical signal, and then send them to the signal receiving device 12. The signal receiving device 12 then converts the received optical signals into radio frequency electrical signals, video electrical signals, and general data electrical signals before transmitting them to the outside. In this way, the digital-analog hybrid optical fiber system can meet the transmission requirements of radio frequency electrical signals, video electrical signals, and general data electrical signals, thereby meeting the needs of scenarios with mixed functions and complex and diverse interfaces. Furthermore, the transmission of video electrical signals and general data electrical signals can achieve long-distance transmission (e.g., transmission over a kilometer) and support a transmission bandwidth of up to 18 Gbps (gigabits per second). The digital-analog hybrid optical fiber system also supports end-to-end diagnostics, thereby reducing installation and maintenance time.

[0083] In one embodiment, Figure 2 This is a schematic diagram of a digital-analog hybrid optical fiber system using a single-mode optical fiber for transmission, provided in Embodiment 1 of this utility model. Figure 3 This is a schematic diagram illustrating the use of two single-mode optical fibers for transmission in a digital-analog hybrid optical fiber system according to Embodiment 1 of this utility model; it should be noted that... Figure 2 and Figure 3The arrows in the diagram are for illustrative purposes only; their actual direction can be adjusted as needed. The signal transmitting device 11 includes a first controller 21, a first photoelectric conversion device 26, and a first optical signal processing device 35.

[0084] The first photoelectric conversion device 26 can be a tunable laser to achieve wavelength division multiplexing. It can carry a bandwidth of 40 Gbps (gigabits per second). The first photoelectric conversion device 26 may include an optical modulator 22.

[0085] The first controller 21 is electrically connected to the first photoelectric conversion device 26 and the first optical signal processing device 35 respectively; the output end of the first photoelectric conversion device 26 is electrically connected to the input end of the first optical signal processing device 35; the output end of the first optical signal processing device 35 is connected to the signal receiving device 12 through at least one single-mode optical fiber.

[0086] The input terminal of the first photoelectric conversion device 26 is used to receive externally input radio frequency electrical signals, video electrical signals, and general data electrical signals; the first controller 21 is also used to control the first photoelectric conversion device 26 to convert the radio frequency electrical signals, video electrical signals, and general data electrical signals into radio frequency optical signals, video optical signals, and general data optical signals, and then send them to the first optical signal processing device 35; the controller is also used to control the first optical signal processing device 35 to mix at least two of the radio frequency optical signals, video optical signals, and general data optical signals to obtain a first mixed optical signal, and send the optical signal to the signal receiving device 12 through the corresponding single-mode optical fiber.

[0087] In this embodiment, the first photoelectric conversion device 26 and the first optical signal processing device 35 can more efficiently convert the received radio frequency electrical signals, video electrical signals and general data electrical signals into radio frequency optical signals, video optical signals and general data optical signals.

[0088] In one embodiment, the signal transmitting device 11 and the signal receiving device 12 are connected via a single-mode optical fiber 27.

[0089] The first controller 21 is also used to control the first optical signal processing device 35 to mix the radio frequency optical signal, video optical signal and general data optical signal to obtain a first mixed optical signal, and send the first mixed optical signal to the signal receiving device 12 through a single-mode optical fiber.

[0090] It should be noted that the first controller 21 performs the corresponding operation through control signals input from external devices.

[0091] Preferably, the first mixed optical signal can be obtained by mixing the radio frequency optical signal, the video optical signal and the general data optical signal according to their wavelengths.

[0092] In this embodiment, radio frequency optical signals, video optical signals and general data optical signals are mixed into a first mixed optical signal, which enables the optical signal to be transmitted more efficiently.

[0093] In one embodiment, the signal transmitting device 11 and the signal receiving device 12 are connected via two single-mode optical fibers.

[0094] Figure 3 This is a schematic diagram of a digital-analog hybrid optical fiber system using two single-mode optical fibers for transmission, provided in Embodiment 1 of this utility model.

[0095] The first controller 21 is also used to control the first optical signal processing device 35 to mix the video optical signal and the general data optical signal to obtain a first mixed optical signal, and to send the first mixed optical signal and the radio frequency optical signal to the signal receiving device 12 through one of the single-mode optical fibers respectively.

[0096] like Figure 3 As shown, the first hybrid optical signal can be transmitted through the MPO single-mode fiber 42, and the radio frequency optical signal can be transmitted through the FC / APC single-mode fiber 41.

[0097] It should be noted that, Figure 3 The FC / APC single-mode fiber 41 in the middle can be replaced with SC / APC single-mode fiber to transmit radio frequency optical signals.

[0098] In this embodiment, the video optical signal and the general data optical signal are mixed into a first mixed optical signal, and the radio frequency optical signal and the first mixed optical signal are transmitted to the signal receiving device 12 through a more suitable single-mode optical fiber, which enables the optical signal to be transmitted more efficiently.

[0099] In one embodiment, the signal receiving device 12 includes a second controller 33, a second photoelectric conversion device 34, and a second optical signal processing device 28;

[0100] The second optical signal processing device 28 can also be a tunable laser to achieve wave demultiplexing. It can carry a bandwidth of 40 Gbps (gigabits per second). The second photoelectric conversion device 34 may include an optical demodulator 29.

[0101] The second controller 33 is electrically connected to the second photoelectric conversion device 34 and the second optical signal processing device 28 respectively; the input end of the second optical signal processing device 28 is connected to the signal transmitting device 11 through at least one single-mode optical fiber; the output end of the second optical signal processing device 28 is electrically connected to the input end of the second photoelectric conversion device 34.

[0102] The second controller 33 is also used to control the second optical signal processing device 28 to convert the received optical signal into radio frequency optical signal, video optical signal and general data optical signal and then send it to the second photoelectric conversion device 34; the second controller 33 is also used to control the second photoelectric conversion device 34 to convert the radio frequency optical signal, video optical signal and general data optical signal into radio frequency electrical signal, video electrical signal and general data electrical signal and then send it to the outside.

[0103] In this embodiment, the second optical signal processing device 28 and the second photoelectric conversion device 34 can more efficiently convert the received optical signal into radio frequency electrical signal, video electrical signal and general data electrical signal.

[0104] In one embodiment, the signal transmitting device 11 includes a first controller 21 and a multiplexer; the first controller 21 is electrically connected to the multiplexer.

[0105] In response to a first bandwidth of the video electrical signal and the general data electrical signal being greater than or equal to a first bandwidth threshold, the controller controls the multiplexing selector to select spatial multiplexing technology to process the video electrical signal and the general data electrical signal to obtain the video optical signal and the general data optical signal.

[0106] The first bandwidth threshold can be set according to the actual situation.

[0107] For example, when the first bandwidth of the video signal and the general data signal is greater than or equal to 40 Gbps (gigabits per second), the controller controls the multiplexing selector to select spatial multiplexing technology to process the video signal and the general data signal.

[0108] In response to the speed of the video electrical signal and the general data electrical signal being less than or equal to a speed threshold, the first controller 21 controls the multiplexing selector to select time-division multiplexing technology to process the video electrical signal and the general data electrical signal to obtain the video optical signal and the general data optical signal.

[0109] Furthermore, video electrical signals and general data electrical signals can be further processed into corresponding digital optical signals and analog optical signals in the aforementioned signal classification and preprocessing device. The controller then controls the multiplexing selector to select digital time-division multiplexing technology for the digital optical signal. This digital time-division multiplexing technology is... Figure 2 The digital time-division multiplexing unit 23 in the middle performs the operation. Frequency division multiplexing (FDM) is selected for the analog optical signal; this FDM is performed by... Figure 2 The analog optical signal in the process is selected by the analog frequency division multiplexing unit 24 for execution.

[0110] For example, for low-to-medium speed (less than 40 Mbps, megabits per second) video electrical signals and general data electrical signals, the first controller 21 controls the multiplexing selector to select time-division multiplexing technology to process the video electrical signals and general data electrical signals. This time-division multiplexing technology can be based on flexible Ethernet to dynamically allocate time slots for video electrical signals and general data electrical signals to achieve time-division multiplexing.

[0111] In response to a second bandwidth of the radio frequency electrical signal being greater than or equal to a second bandwidth threshold, the controller controls the multiplexing selector to select either subcarrier multiplexing or orthogonal frequency division multiplexing (OFDM) technology to process the radio frequency electrical signal to obtain a radio frequency optical signal. The first bandwidth threshold is greater than the second bandwidth threshold.

[0112] The second bandwidth threshold can be set according to the actual situation.

[0113] For example, when the second bandwidth of the radio frequency (RF) signal is greater than or equal to 2 Gbps (gigabits per second), the controller controls the multiplexing selector to select either spatial multiplexing (SDM) or orthogonal frequency division multiplexing (OFDM) technology to process the RF signal. This SDM technology supports multiple modulation schemes such as QPSK (Quadrature Phase Shift Keying), 16QAM (16 Quadrature Amplitude Modulation), and 64QAM (64 Quadrature Amplitude Modulation).

[0114] Extensive experiments have shown that this method of automatically selecting the corresponding multiplexing technology based on the signal type can complete the rapid switching of the digital layer within 50ms and achieve optical layer reconstruction within 2 seconds, ensuring that the system always works in the optimal state.

[0115] In this embodiment, the controller controls the multiplexing selector to select the multiplexing technology corresponding to the signal, which can support intelligent multiplexing of multiple input signals and improve the multiplexing efficiency of various types of signals.

[0116] In one embodiment, the signal receiving device 12 includes a second controller 33 and a demultiplexing selector; the second controller 33 is electrically connected to the demultiplexing selector.

[0117] The second controller 33 is used to control the demultiplexing selector to select the corresponding demultiplexing technology for processing based on the received radio frequency optical signal, video optical signal and general data optical signal after multiplexing technology processing, so as to obtain radio frequency electrical signal, video electrical signal and general data electrical signal.

[0118] For example: the demultiplexing technology corresponding to digital time-division multiplexing technology is composed of... Figure 2 The digital time-division multiplexing unit 30 in the middle performs the operation; the demultiplexing technology corresponding to the analog optical signal selective frequency division multiplexing technology is performed by... Figure 2 The analog frequency decomposition and multiplexing unit 31 in the middle is executed;

[0119] Furthermore, the decision parameters for the multiplexing selector and demultiplexing selector can also be at least one of the following: current traffic load, signal delay sensitivity, signal bandwidth requirements, single-mode fiber resource utilization, signal QoS (Quality of Service) level, and signal transmission speed.

[0120] In this embodiment, the second controller 33 is used to control the demultiplexing selector to select the corresponding demultiplexing technology for processing according to the received radio frequency optical signal, video optical signal and general data optical signal after multiplexing technology processing, so as to more efficiently and accurately convert the radio frequency optical signal, video optical signal and general data optical signal into radio frequency electrical signal, video electrical signal and general data electrical signal.

[0121] In one embodiment, the signal transmitting device 11 includes a first controller 21 and a first low-noise amplifier 36;

[0122] The first low-noise amplifier 36 is electrically connected to the first controller 21; the first controller 21 is also used to control the opening and closing of the first low-noise amplifier 36 in order to control the noise of the radio frequency electrical signal in the signal transmitting device 11.

[0123] And / or,

[0124] The signal receiving device 12 includes a second controller 33 and a second low-noise amplifier. The second low-noise amplifier is electrically connected to the first controller 21.

[0125] The second controller 33 is also used to control the opening and closing of the second low-noise amplifier in order to control the noise of the radio frequency electrical signal in the signal receiving device 12.

[0126] A first low-noise amplifier 36 is provided in the signal transmitting device 11, and a second low-noise amplifier (LNA) is provided in the signal receiving device 12. The settings of the low-noise amplifiers allow users to adjust the noise figure, input P1dB (compression point), and IP3 (third-order intercept point) while having a wide dynamic range.

[0127] It's important to note that P1dB (compression point) is a performance parameter for input power. A higher compression point means higher input power. P1dB refers to the input power point where the gain decreases by 1dB compared to very low power levels. IP3 (third-order cutoff point) is a parameter representing the linearity or distortion performance of the input signal. A higher IP3 indicates better linearity and less distortion in the input signal.

[0128] Taking the first low-noise amplifier 36 as an example:

[0129] The first low-noise amplifier 36 can be controlled by the first controller 21. For broadband applications, the frequency range of the signal transmitting device 11 can be extended from 0.5 to 6000 MHz to 67 GHz; the input-output VSWR is 1.7:1, and the input-output impedance is 50 Ohms. By controlling the opening and closing of the first low-noise amplifier, the noise of the radio frequency signal can be adjusted. For example, the noise level is 27 dB when the first low-noise amplifier 36 is "on" and 6 dB when the first low-noise amplifier 36 is "off".

[0130] Furthermore, the first low-noise amplifier 36 can also adjust the gain, gain amplitude, and input P1dB (compression point) of the RF signal link. For example:

[0131] The gain of the RF signal link is 37dB when the first low-noise amplifier 36 is "on" and 7dB when the first low-noise amplifier 36 is "off".

[0132] The gain amplitude of the first low-noise amplifier 36 is ±2.0dB when it is "on" or "off"; furthermore, the first low-noise amplifier 36 can ensure that the gain amplitude of the radio frequency signal link is not greater than 0.5dB when the internal temperature of the signal transmitting device 11 exceeds 100°C.

[0133] Input 1dB compression point: When the first low noise amplifier 36 is "on", the input P1dB (compression point) is -33dBm (milliwatts decibels), and when the first low noise amplifier 36 is "off", the input P1dB (compression point) is -3dBm.

[0134] In this embodiment, by providing a first low-noise amplifier 36 in the signal transmitting device 11 and / or a second low-noise amplifier in the signal receiving device 12, the purity of the radio frequency electrical signal can be enhanced, preventing noise from affecting the efficiency of signal transmission. Furthermore, the overall noise figure of the system can be reduced, and the quality of the radio frequency electrical signal can be improved.

[0135] In one embodiment, the signal transmitting device 11 includes a first controller 21 and a first temperature sensor 25; the first temperature sensor 25 is electrically connected to the first controller 21; the first temperature sensor 25 is used to acquire a first temperature within the signal transmitting device 11; the first controller 21 is also used to control the first temperature sensor 25 to send the first temperature to the first controller 21.

[0136] In this embodiment, a first temperature sensor 25 is provided in the signal transmitting device 11. The first controller 21 can monitor the temperature inside the signal transmitting device 11 in real time by detecting the first temperature by the first temperature sensor 25, so as to prevent the excessive temperature from affecting the signal processing and transmission efficiency in the signal transmitting device 11.

[0137] In one embodiment, the signal receiving device 12 includes a second controller 33 and a second temperature sensor 32; the second temperature sensor 32 is electrically connected to the second controller 33. The second temperature sensor 32 is used to acquire a second temperature within the signal receiving device 12; the second controller 33 is also used to control the second temperature sensor 32 to send the second temperature to the second controller 33.

[0138] Preferably, the signal transmitting device 11 and the signal receiving device 12 are preferably in operation at a temperature of -20 to +70°C and in storage at a temperature of -40 to +85°C, in order to comply with safety regulations.

[0139] In this embodiment, a second temperature sensor 32 is provided in the signal receiving device 12. The second controller 33 can monitor the temperature inside the signal receiving device 12 in real time by detecting the second temperature through the second temperature sensor 32, so as to prevent the excessive temperature from affecting the signal processing and transmission efficiency in the signal receiving device 12.

[0140] In one embodiment, a light sensor can be provided in both the signal receiving device 12 and the signal transmitting device 11. Taking the signal receiving device 12 as an example, the light sensor is electrically connected to the second controller 33 so that the second controller 33 can monitor the quality and transmission efficiency of the light signal in real time through the data detected by the light sensor.

[0141] In one embodiment, the digital-analog hybrid fiber optic system further includes a GUI (Graphical User Interface) for issuing control commands to the first controller 21 and the second controller 33 to control the operation of other components in the digital-analog hybrid fiber optic system.

[0142] In one embodiment, the digital-analog hybrid fiber optic system also includes a path gain calculator, which may be located after the first low-noise amplifier and / or the second low-noise amplifier and electrically connected to the first controller 21 and / or the second controller, to help the user calculate the RF link gain and optical prediction parameters in the signal transmitting device 11 and / or the signal receiving device 12.

[0143] In one embodiment, the first controller 21 and / or the second controller 33 can both be connected to a radio frequency detector 37, and the radio frequency detector 37 can be set on the transmission link of the radio frequency electrical signal to monitor the transmission quality of the radio frequency electrical signal in real time.

[0144] In one embodiment, the signal transmitting device includes a first analog channel and a first digital channel; the signal receiving device includes a second analog channel and a second digital channel; the first analog channel and the second analog channel are used to transmit radio frequency electrical signals; the first digital channel and the second digital channel are used to transmit video electrical signals and general data electrical signals.

[0145] The signal transmitting device transmits the radio frequency test electrical signal to the second analog channel through the first analog channel.

[0146] It should be noted that the radio frequency test signal has a specific type, such as a single-tone signal or a swept-frequency signal, so that the receiving end can accurately identify the signal.

[0147] The signal transmitting device transmits the initial signal parameters of the radio frequency test electrical signal to the second digital channel through the first digital channel.

[0148] The initial signal parameters include at least one of the frequency, power, or modulation format of the radio frequency test signal.

[0149] The signal receiving device is also used to acquire the actual signal parameters of the radio frequency test electrical signal in the second analog channel and the initial signal parameters in the second digital channel, and to evaluate the transmission quality of the radio frequency test electrical signal based on the actual signal parameters and the initial signal parameters.

[0150] Specifically, the signal-to-noise ratio (SNR), error vector amplitude (EVM), and average power value of the RF test signal during transmission can be obtained based on the initial signal parameters and the actual signal parameters. The transmission quality of the RF test signal can then be evaluated based on these parameters. Preferably, the actual signal parameters can be obtained at the frequency or under the conditions corresponding to the transmission of the RF test signal.

[0151] Taking the evaluation of the transmission quality of the RF test signal by the error vector amplitude (EVM) as an example.

[0152] Assuming the RF test signal is an ideal 16QAM (Quadrature Amplitude Modulation) signal with an ideal error vector amplitude (EVM) of 0.10% during transmission, the actual error vector amplitude (EVM) of the RF test signal received by the signal receiving device is 3%. This indicates that the transmission channels of the RF test signal (i.e., the first analog channel and the second analog channel) have experienced distortion (e.g., nonlinear changes) or noise that adversely affects the error vector amplitude (EVM), resulting in poor transmission quality of the RF test signal.

[0153] Therefore, the signal receiving device can generate a control command based on the transmission quality of the RF test signal evaluated by the error vector amplitude (EVM). This control command could be to reduce the transmit power by 10 dB. This command is then sent to the first digital channel via the second digital channel to instruct the signal transmitting device to reduce the transmit power by 10 dB. Specifically, the signal transmitting device can reduce the noise figure of the first analog channel by activating the first low-noise amplifier. Furthermore, the signal receiving device can also activate the second low-noise amplifier to reduce the noise figure of the second analog channel. After this processing, the error vector amplitude (EVM) can be improved to <0.2%, ensuring minimal degradation of signal quality.

[0154] For example, the control commands generated based on the actual transmission quality can also be used to increase the power of the RF test signal or adjust the modulation format of the RF test signal. The specific generation method is similar to that described above, which uses the Error Vector Magnitude (EVM) to evaluate the transmission quality of the RF test signal and then generates control commands, and will not be elaborated on here.

[0155] The signal transmitting device is also used to acquire the control instructions in the first digital channel and adjust the initial signal parameters of the radio frequency test signal according to the control instructions. In this embodiment, by injecting the radio frequency test signal, the transmission quality of the radio frequency test signal is evaluated based on its initial signal parameters and actual signal parameters, and the initial signal parameters are adjusted. In this way, the evaluation of the radio frequency test signal and the adjustment of the initial signal parameters of the radio frequency test signal can be completed using the analog and digital channels of the signal transmitting and receiving devices in the digital-analog hybrid optical fiber system. This not only solves the cost problem but also ensures more stable transmission of the subsequent radio frequency signal.

[0156] In one embodiment, the present invention also provides a binary protocol (SSTP) for transmitting radio frequency test electrical signals and the digital signals required by the control equipment. The SSTP uses a 30-byte fixed-length frame structure to support the transmission of various signal type parameters and device status control.

[0157] The protocol frame structure includes a 2-byte frame start identifier field, ranging from 0xAA55, which serves as a frame synchronization identifier; a 1-byte frame type field, ranging from 0x01 to 0x04, which indicates the frame type; a 1-byte sequence number field, ranging from 0x00 to 0xFF, which can be cyclically counted for acknowledgment matching; a 24-byte data / control payload, the range of which is variable, used to represent signal data or control commands; and a 2-byte CRC16 checksum field for verifying the protocol frame.

[0158] Specifically, the above frame types can be divided into data frames, control frames, status frames, and response frames. The data frame has a type value of 0x01 and is used to transmit the initial signal parameters of the radio frequency test signal; the control frame has a type value of 0x02 and is used to transmit control commands; the status frame has a type value of 0x03 and is used for device status query / reporting; the response frame has a frame type of 0x04 and is used for command execution confirmation.

[0159] The 24-byte payload format of the aforementioned data frame (0x01) includes a 4-byte signal type field. Specifically, 0001 indicates a single-tone signal, 0010 indicates a digitally modulated signal, 0011 indicates the type of the RF test signal is LTE, and 0100 indicates the type of the RF test signal is NR. It also includes an 8-byte frequency field, which is a 64-bit unsigned integer (Hz); a 1-byte signal strength field, which is a signed integer (dBm); a variable-size specific parameter field, which is determined according to the signal type; and a variable-size padding parameter field, which can be filled with all zeros up to 24 bytes. For example, single-tone signal: no other parameters; digitally modulated signal: symbol rate (4 bytes) + modulation method (2 bits); LTE test signal: test mode (1 byte) + bandwidth (3 bits); NR test signal: test mode (1 byte) + bandwidth (4 bits).

[0160] The 4-byte instruction header format of the aforementioned control frame (0x02) includes a 1-byte instruction type field, which represents the specific operation instruction; a 1-byte device address field, which indicates the target device address; a 1-byte parameter length field, which indicates the parameter data length; and a 1-byte reserved field for expansion. Control instructions can be transmitted through this control frame to enable the signal transmitting device to adjust its settings, thereby ensuring signal transmission quality. For example, a control parameter of 0x00 indicates that the low-noise amplifier is on, while 0x01 indicates that the low-noise amplifier is either on or off.

[0161] The 24-byte status report format of the aforementioned status frame (0x03) includes a 2-byte device temperature field, which is a signed integer (°C); a 2-byte power supply voltage field, which is an unsigned integer (mV); a 1-byte low-noise amplifier status field, where 0x00 indicates off; 0x01 indicates on; and 0x02 indicates a fault; a 1-byte signal status field, where 0x00 indicates off; 0x01 indicates on; and 0x02 indicates a fault; a 1-byte laser status field, where 0x00 indicates off; 0x01 indicates on; and 0x02 indicates a fault; a 2-byte current gain field, which is a signed integer (dB); a 4-byte filter status field, which indicates the current filter parameters; a 2-byte device error code field, which indicates the error status; and a 9-byte reserved field, which is used for future expansion.

[0162] The 24-byte response format of the aforementioned response frame includes a 1-byte original instruction type field, which represents the instruction type of the response; a 1-byte execution result field, where 0x00 indicates success; 0x01 indicates failure; and 0x02 indicates busy; a 2-byte error code field, which describes detailed error information; a 20-byte return data field, which is used for instruction execution return data; and a variable-size reserved field, which is filled with all zeros.

[0163] The above CRC checksum is the CRC-16-CCITT algorithm, whose polynomial can be expressed as: 0x1021(x 16 +x12+x 5 +1), where x is the polynomial coefficient. Its initial value can be 0xFFFF, its calculation range is the first 28 bytes (Header + payload), and its output method is direct output, without inversion or XOR.

[0164] The data frame header includes a 4-bit (1 byte = 8 bits) signal type field, located at positions 0-3, in unsigned format, used to identify the signal format; a 4-bit reserved field, located at positions 4-7, which must be 0; a 64-bit frequency field, located at positions 8-71, in unsigned integer format, used to represent the signal center frequency (Hz); and an 8-bit signal strength field, located at positions 72-79, in signed integer format, used to represent the signal power (dBm). For example: 0001: single-tone signal; 0010: digital modulation signal; 0011: LTE RF test signal; 0100: NR RF test signal.

[0165] The payload structure of the aforementioned single-tone signal includes a 4-bit signal type field, located at positions 0-3, with a format of 0001, which identifies the single-tone signal; a 4-bit reserved field, located at positions 4-7, with a format of 0000, which must be 0; a 64-bit frequency field, located at positions 8-71, with a format of unsigned integer, representing the frequency (Hz); an 8-bit signal strength field, located at positions 72-79, with a format of signed integer, representing the strength (dBm); and a 112-bit reserved field, located at positions 80-191, with a format of all zeros, used as padding bits.

[0166] Example: A single-tone signal with a signal strength of -10dBm and a frequency of 1GHz (1GHz = 1000000000Hz). Its binary representation can be: 00010000 000000000000000000000000000000000000000000011110100001

[0168] 00100000000 411110110 All zeros filled with 112 bits remaining.

[0169] Hexadecimal can be represented as:

[0170] 10000000003B9ACA00F60000000000000000000000000000.

[0171] The payload structure of the aforementioned digital modulation signal includes a 4-bit signal type field, located at positions 0-3, in the format 0010, which is the digital modulation signal identifier; a 4-bit reserved field, located at positions 4-7, in the format 0000, which must be 0; a 64-bit frequency field, located at positions 8-71, in the format of an unsigned integer, representing the frequency (Hz); an 8-bit signal strength field, located at positions 72-79, in the format of a signed integer, representing the strength (dBm); a 32-bit symbol rate field, located at positions 80-111, in the format of an unsigned integer, representing the symbol rate (Symbol / s, symbols / second); a 2-bit modulation scheme field, located at positions 112-113, in the format of an enumeration, representing the modulation type; and a 78-bit reserved field, located at positions 114-191, in the format of all zeros, used as padding bits. The adjustment method can be encoded as follows: 00, BPSK (Binary Phase Shift Keying); 01, QPSK (Quadrature Phase Shift Keying); 10, 16QAM (Quadrature Amplitude Modulation); 11, 64QAM.

[0172] Example: A QPSK signal with a signal strength of -5dBm, a symbol rate of 1MSymbol / s, and a frequency of 2.4GHz. Its binary representation can be: 00010000 000000000000000000000000000000000000000000011110100001

[0174] 00100000000 411110110 All zeros filled with 112 bits remaining.

[0175] Its hexadecimal representation can be expressed as:

[0176] 10000000003B9ACA00F60000000000000000000000000000.

[0177] The payload structure of the aforementioned LTE test signal includes a 4-bit signal type field, located at positions 0-3, in the format 0011, which is the LTE signal identifier; a 4-bit reserved field, located at positions 4-7, in the format 0000, which must be 0; a 64-bit frequency point field, located at positions 8-71, in the format of an unsigned integer, representing the frequency point (Hz); an 8-bit signal strength field, located at positions 72-79, in the format of a signed integer, representing the strength (dBm); an 8-bit test mode field, located at positions 80-87, in the format of an unsigned integer, representing the LTE test mode; a 3-bit bandwidth field, located at positions 88-90, in the format of an enumeration, representing the signal bandwidth; and a 101-bit reserved field, located at positions 91-191, in the format of all zeros, used as padding bits. Its bandwidth encoding can be represented as: 000, 5MHz; 001, 10MHz; 010, 15MHz; 011, 20MHz. Its test mode example encoding can be represented as: TM1.1, 0x11; TM1.2, 0x12; TM2.1→0x21; TM2.2→0x22; TM3.1→0x31.

[0178] Example: The test mode implementation code is TM3.1, the bandwidth is 10MHz, the signal strength is 0dBm, and the frequency is 1.8GHz LTE test signal.

[0179] Its signal type: 0011; frequency: 1.8GHz = 1800000000Hz = 0x000000006B49D200; signal strength: 0dBm = 0x00; test mode: TM3.1 = 0x31; bandwidth: 10MHz = 001.

[0180] Its hexadecimal representation can be expressed as:

[0181] 30000000006B49D200003120000000000000000000000000.

[0182] The payload structure of the aforementioned LTE test signal includes a 4-bit signal type field, located at positions 0-3, in the format 0100, which is the NR signal identifier; a 4-bit reserved field, located at positions 4-7, in the format 0000, which must be 0; a 64-bit frequency point field, located at positions 8-71, in the format of an unsigned integer, representing the frequency point (Hz); an 8-bit signal strength field, located at positions 72-79, in the format of a signed integer, representing the strength (dBm); an 8-bit test mode field, located at positions 80-87, in the format of an unsigned integer, representing the NR test mode; a 4-bit bandwidth field, located at positions 88-91, in the format of an enumeration, representing the signal bandwidth; and a 100-bit reserved field, located at positions 92-191, in the format of all zeros, used as padding bits. Its bandwidth encoding can be represented as: 0000, 5MHz; 0001, 10MHz; 0010, 15MHz; 0011, 20MHz; 0100, 50MHz; 0101, 100MHz. Its test mode example encoding can be represented as: TM1.1, 0x11; TM1.2, 0x12; TM2.1→0x21; TM2.2→0x22; TM3.1→0x31.

[0183] Example: Test mode implementation code is TM2.1, bandwidth is 100MHz, signal strength is -20dBm, frequency is 3.5GHz LTE test signal.

[0184] Its signal type: 0100; frequency: 3.5GHz = 3500000000Hz = 0x00000000D09F3000; signal strength: -20dBm = 0xEC; test mode: TM2.1 = 0x21; bandwidth: 100MHz = 0101.

[0185] Its hexadecimal representation can be expressed as:

[0186] 4000000000D09F3000EC2150000000000000000000000000.

[0187] By utilizing the protocol frame structure, a complete frame of an NR test signal can be obtained.

[0188] Assume the complete frame of the NR test signal starts with AA55, frame type: 01, sequence number: 01, payload: 4000000000D09F3000EC215000000000000000000000000000, CRC16: [Calculate the checksum of the first 28 bytes].

[0189] CRC16 is a cyclic redundancy check algorithm widely used in data transmission and storage. It detects data errors by calculating a 16-bit checksum.

[0190] The signal transmitting device sends the complete frame of the NR test signal to the signal receiving device through the first analog channel.

[0191] After the signal receiving device identifies the frame start value 0xAA55 of the complete NR test signal frame, it parses the data to obtain the frame type 0x01 (data frame), sequence number 0x01, signal type 0100 (NR), frequency 3.5GHz, strength -20dBm, mode TM2.1, and bandwidth 100MHz. It can also perform CRC verification.

[0192] In one embodiment, Figure 4 A control flowchart for a digital-analog hybrid fiber optic system provided in Embodiment 1 of this utility model; Figure 5 This is a schematic diagram of control and adjustment in a digital-analog hybrid fiber optic system provided in Embodiment 1 of this utility model; combined with Figure 4 and Figure 5 This section will explain again how to adjust the initial signal parameters of the RF test signal.

[0193] S1: Signal transmitting device 11 receives radio frequency test signals.

[0194] S2: The signal transmitting device 11 transmits the radio frequency test signal to the signal receiving device 12 through the first analog channel 51, and transmits the initial signal parameters of the radio frequency test signal to the signal receiving device 12 through the first digital channel 52.

[0195] The first optical signal processor 35 mixes the radio frequency test signal and the initial signal parameters and inputs them into the signal receiving device 12. The second optical signal processor 28 decomposes the mixed signal into the radio frequency test signal and the initial signal parameters, and inputs the radio frequency test signal into the second analog channel 53 and the initial signal parameters into the second digital channel 54.

[0196] S3: The signal receiving device 12 analyzes the radio frequency test signal to obtain the actual signal parameters of the radio frequency test signal, and evaluates the transmission quality of the radio frequency test signal based on the actual signal parameters and the initial signal parameters.

[0197] S4: The signal receiving device 12 generates an adjustment command based on the transmission quality and transmits the adjustment command to the signal transmitting device 11 via the second digital channel 54.

[0198] S5: The signal transmitting device 11 adjusts the initial signal parameters according to the adjustment command to stabilize the transmission link of the radio frequency test signal.

[0199] Specifically, the signal transmitting device 11 can perform the above operation according to the first controller 21, and the signal receiving device 12 can perform the above operation according to the second controller 33.

[0200] It should be noted that if the result still does not meet expectations after one adjustment, a new RF test signal can be injected to re-execute S1 to S5. The signal parameters of this new RF test signal are the initial signal parameters of the RF test signal after the last adjustment.

[0201] In one embodiment, this hybrid digital-analog fiber optic system is suitable for distributed antenna designs in applications such as radar, GPS / BeiDou / satellite communication, 4G / 5G LTE (Long Term Evolution), broadcast communication, and radio telescopes—e.g., building distribution systems, shipboard distributed antenna designs, etc. This hybrid digital-analog fiber optic system can also enable long-distance transmission of video electrical signals and remote connections for various general-purpose data electrical signals, such as control systems, monitoring centers, and command centers in various organizations and industries.

[0202] In one embodiment, this hybrid digital-analog fiber optic system can be applied to remote testing in a large aircraft production workshop. In the large aircraft production workshop, it is necessary to test the transmit and receive signals (i.e., radio frequency signals) of the airborne radio frequency antenna, and also to debug the signals (i.e., video signals and general data signals) of the aircraft control equipment. This hybrid digital-analog fiber optic system can be used to directly connect to various equipment on the aircraft in the workshop, including digital control equipment and radio frequency equipment, from within the office building. This allows daily testing and debugging work to be completed entirely from the office without entering the large aircraft factory workshop, significantly improving efficiency and reducing on-site work requirements.

[0203] In one embodiment, this hybrid digital-analog fiber optic system can also be used for remote testing in a microwave anechoic chamber. 5G millimeter-wave base station communication equipment typically requires testing the beam signals of Massive MIMO (Massive MIMO) in a microwave anechoic chamber; during testing, parameters need to be repeatedly adjusted and base station software updated, requiring control of the turntable. This hybrid digital-analog fiber optic system can establish a remote fiber optic connection between the testing station and the microwave anechoic chamber, allowing for control of the anechoic chamber turntable at any time using USB electrical signals (a type of general data signal), and also enabling remote observation of the power and waveform of the signal received at the beam receiver in the anechoic chamber using an oscilloscope and logic analyzer.

[0204] In one embodiment, this hybrid digital-analog fiber optic system can be applied to aircraft EMC (electromagnetic compatibility) testing. This EMC testing, including EMS (electromagnetic interference immunity) and EMI (electromagnetic interference) testing, needs to be conducted in a closed EMC test chamber (anechoic chamber), where personnel are typically not permitted. Using this hybrid digital-analog fiber optic system, a remote fiber optic connection can be established between the test station and the EMC test chamber. A signal generator can remotely transmit radio frequency interference signals via an optical transceiver to verify the equipment's interference immunity.

[0205] In one embodiment, this hybrid digital-analog fiber optic system can be applied to automotive EMC (electromagnetic compatibility) testing. This EMC testing, including EMS (electromagnetic interference immunity) and EMI (electromagnetic interference) testing, needs to be conducted in a closed EMC test chamber (anechoic chamber), where personnel are typically not permitted. Using this hybrid digital-analog fiber optic system, a remote fiber optic connection can be established between the test station and the EMC test chamber. A signal generator can remotely transmit radio frequency interference signals via an optical transceiver to verify the equipment's interference immunity.

[0206] Example 2

[0207] This invention also provides an embodiment of an optical transceiver. The optical transceiver includes a chassis for integrating the digital-analog hybrid fiber optic system of Embodiment 1.

[0208] The chassis is also equipped with an RF interface, a video interface, a general data interface, and at least one pair of fiber optic interfaces for receiving and transmitting corresponding signals.

[0209] Preferably, the chassis can be a 1U standard chassis, where 1U is 44.45 mm.

[0210] Figure 6 A schematic diagram of the signal transmitting end of an optical transceiver provided in Embodiment 2 of this utility model; Figure 7 This is a schematic diagram of a signal receiving end of an optical transceiver provided in Embodiment 2 of this utility model. The radio frequency interface includes an input interface for radio frequency electrical signals (RF signals). Figure 6 The RF[IN] and radio frequency electrical signal output interface (in the text) Figure 7 The RF[OUT] in the video interface includes the input interface for video electrical signals. Figure 6 HDMI[IN] and video electrical signal output interface ( Figure 7 The HDMI [OUT] interface, a general data interface, includes a general data electrical signal input interface. Figure 6 The interface includes USB, Ethernet, RS232, Micro USB and general data signal output interfaces. Figure 7USB, Ethernet, RS232, Micro USB), and at least one pair of fiber optic interfaces including an input interface ( Figure 7 MPO and FIBER IN) and output interfaces ( Figure 6 (MPO and FIBER OUT in the data).

[0211] In this embodiment, the optical transceiver features a higher frequency range, greater transmission bandwidth, and lower latency, enabling it to adapt to the development needs of future high-speed communication networks such as 5G and 6G. Furthermore, it can achieve more efficient equipment management and maintenance through more advanced software control and diagnostic functions. In application areas, this optical transceiver can provide efficient and reliable communication support for industries such as the Internet of Things, the Industrial Internet, and intelligent transportation. This optical transceiver can provide users with a richer and smoother multimedia experience. With its superior performance and reliable quality, this optical transceiver will make a significant contribution to the development of the communications industry.

[0212] For the system embodiments, since they basically correspond to the method embodiments, the relevant parts can be referred to in the description of the method embodiments. The system embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separate. The components as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this utility model solution according to actual needs.

[0213] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A hybrid digital-analog fiber optic system, characterized in that, The digital-analog hybrid optical fiber system includes a signal transmitting device and a signal receiving device; the signal transmitting device and the signal receiving device are connected via at least one single-mode optical fiber. The signal transmitting device is used to receive radio frequency electrical signals, video electrical signals and general data electrical signals, and to convert the radio frequency electrical signals, the video electrical signals and the general data electrical signals into radio frequency optical signals, video optical signals and general data optical signals; The signal transmitting device is further configured to mix at least two of the radio frequency optical signal, the video optical signal and the general data optical signal to obtain a first mixed optical signal, and transmit all the optical signals to the signal receiving device through the corresponding single-mode optical fiber. The signal receiving device is used to convert the received optical signal into the radio frequency electrical signal, the video electrical signal, and the general data electrical signal before transmitting them to the outside.

2. The digital-analog hybrid fiber optic system as described in claim 1, characterized in that, The signal transmitting device includes a first controller, a first photoelectric conversion device, and a first optical signal processing device; The first controller is electrically connected to the first photoelectric conversion device and the first optical signal processing device, respectively; The output terminal of the first photoelectric conversion device is electrically connected to the input terminal of the first optical signal processing device; The output of the first optical signal processing device is connected to the signal receiving device through at least one of the single-mode optical fibers; The input terminal of the first photoelectric conversion device is used to receive the externally input radio frequency electrical signal, the video electrical signal, and the general data electrical signal; The first controller is also configured to control the first photoelectric conversion device to convert the radio frequency electrical signal, the video electrical signal and the general data electrical signal into the radio frequency optical signal, the video optical signal and the general data optical signal, and then send them to the first optical signal processing device; The controller is also configured to control the first optical signal processing device to mix at least two of the radio frequency optical signal, the video optical signal, and the general data optical signal to obtain a first mixed optical signal, and to send all the optical signals to the signal receiving device through the corresponding single-mode optical fiber.

3. The digital-analog hybrid fiber optic system as described in claim 2, characterized in that, The signal transmitting device and the signal receiving device are connected via two single-mode optical fibers. The first controller is further configured to control the first optical signal processing device to mix the video optical signal and the general data optical signal to obtain the first mixed optical signal, and to send the first mixed optical signal and the radio frequency optical signal to the signal receiving device through one of the single-mode optical fibers respectively; or; The signal transmitting device and the signal receiving device are connected via one of the single-mode optical fibers; The first controller is further configured to control the first optical signal processing device to mix the radio frequency optical signal, the video optical signal and the general data optical signal to obtain the first mixed optical signal, and to send the first mixed optical signal to the signal receiving device through one of the single-mode optical fibers.

4. The digital-analog hybrid fiber optic system as described in claim 1, characterized in that, The signal receiving device includes a second controller, a second photoelectric conversion device, and a second optical signal processing device; The second controller is electrically connected to the second photoelectric conversion device and the second optical signal processing device, respectively; The input terminal of the second optical signal processing device is connected to the signal transmitting device via at least one of the single-mode optical fibers; The output terminal of the second optical signal processing device is electrically connected to the input terminal of the second photoelectric conversion device; The second controller is also used to control the second optical signal processing device to convert the received optical signal into the radio frequency optical signal, the video optical signal and the general data optical signal, and then send them to the second photoelectric conversion device; The second controller also controls the second photoelectric conversion device to convert the radio frequency optical signal, the video optical signal, and the general data optical signal into the radio frequency electrical signal, the video electrical signal, and the general data electrical signal, and then send them to the outside.

5. The digital-analog hybrid fiber optic system as described in claim 1, characterized in that, The signal transmitting device includes a first controller and a multiplexing selector; The first controller is electrically connected to the multiplexer; The first controller is used to control the multiplexing selector to select the corresponding multiplexing technology according to the decision parameters, so as to convert the radio frequency electrical signal, the video electrical signal and the general data electrical signal into radio frequency optical signal, video optical signal and general data optical signal; wherein, the decision parameters include at least one of the following: current traffic load, signal delay sensitivity, signal bandwidth, single-mode fiber resource utilization, signal transmission speed and signal service quality.

6. The digital-analog hybrid fiber optic system as described in claim 5, characterized in that, In response to the first bandwidth of the video electrical signal and the general data electrical signal being greater than or equal to a first bandwidth threshold, the controller controls the multiplexing selector to select spatial multiplexing technology to process the video electrical signal and the general data electrical signal to obtain the video optical signal and the general data optical signal; In response to the transmission speed of the video electrical signal and the general data electrical signal being less than or equal to a speed threshold, the first controller controls the multiplexing selector to select time-division multiplexing technology to process the video electrical signal and the general data electrical signal to obtain the video optical signal and the general data optical signal; In response to the second bandwidth of the radio frequency electrical signal being greater than or equal to a second bandwidth threshold, the controller controls the multiplexing selector to select either subcarrier multiplexing technology or orthogonal frequency division multiplexing technology to process the radio frequency electrical signal in order to obtain the radio frequency optical signal; Wherein, the first bandwidth threshold is greater than the second bandwidth threshold.

7. The digital-analog hybrid fiber optic system as described in claim 1, characterized in that, The signal receiving device includes a second controller and a demultiplexing selector; The second controller is electrically connected to the demultiplexing selector; The second controller is used to control the demultiplexing selector to select the corresponding demultiplexing technology for processing based on the received multiplexed radio frequency optical signal, video optical signal and general data optical signal, so as to obtain the radio frequency electrical signal, video electrical signal and general data electrical signal.

8. The digital-analog hybrid fiber optic system as described in claim 1, characterized in that, The signal transmitting device includes a first controller and a first low-noise amplifier; The first low-noise amplifier is electrically connected to the first controller; The first controller is also used to control the opening and closing of the first low-noise amplifier in order to control the noise of the radio frequency electrical signal in the signal transmitting device; and / or; The signal receiving device includes a second controller and a second low-noise amplifier; The second low-noise amplifier is electrically connected to the first controller; The second controller is also used to control the opening and closing of the second low-noise amplifier in order to control the noise of the radio frequency electrical signal in the signal receiving device.

9. The digital-analog hybrid fiber optic system as described in claim 2, characterized in that, The signal transmitting device includes a first controller and a first temperature sensor; The first temperature sensor is electrically connected to the first controller; The first temperature sensor is used to acquire the first temperature inside the signal transmitting device; The first controller is also configured to control the first temperature sensor to send the first temperature to the first controller; and / or; The signal receiving device includes a second controller and a second temperature sensor; The second temperature sensor is electrically connected to the second controller; The second temperature sensor is used to acquire a second temperature within the signal receiving device; The second controller is also used to control the second temperature sensor to send the second temperature to the second controller.

10. The digital-analog hybrid fiber optic system as described in claim 1, characterized in that, The signal transmitting device includes a first analog channel and a first digital channel; the signal receiving device includes a second analog channel and a second digital channel; The first analog channel and the second analog channel are used to transmit the radio frequency electrical signal; the first digital channel and the second digital channel are used to transmit the video electrical signal and the general data electrical signal; The signal transmitting device transmits the radio frequency test electrical signal to the second analog channel through the first analog channel; The signal transmitting device transmits the initial signal parameters of the radio frequency test electrical signal to the second digital channel through the first digital channel; The signal receiving device is further configured to acquire the actual signal parameters of the radio frequency test electrical signal in the second analog channel and the initial signal parameters in the second digital channel, and evaluate the transmission quality of the radio frequency test electrical signal based on the actual signal parameters and the initial signal parameters; The signal receiving device is further configured to generate a control command based on the transmission quality, and send the control command to the first digital channel through the second digital channel; The signal transmitting device is further configured to acquire the control command in the first digital channel and control the initial signal parameters of the radio frequency test electrical signal according to the control command.

11. An optical transceiver, characterized in that, The optical transceiver includes a chassis for integrating a hybrid digital-analog fiber optic system as described in any one of claims 1 to 10; The chassis is also equipped with a radio frequency interface, a video interface, a general data interface, and at least one pair of fiber optic interfaces for receiving and transmitting corresponding signals.

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