A 1-40GHz ultra-wideband frequency-converting optical transmission system

Abstract

The present invention discloses a 1-40GHz ultra-wideband frequency-converted optical transmission system, which relates to the field of communication technology. The system comprises a transmitting system and a receiving system. The transmitting system comprises an A1 amplifying unit, an A2 switching unit, a transmitting path unit, an A7 switching unit, an A8 combining unit, an A9 amplifying unit, an A10 matching unit, and an A11 modulating unit, which are connected in sequence. The receiving system comprises a B2 matching unit, a B3 amplifying unit, a B4 branching unit, a B5 switching unit, a receiving path unit, a B11 switching unit, and a B12 amplifying unit, which are connected in sequence. The system emphasizes a 1-40GHz radio frequency signal onto a 1550nm optical signal, and then uses FSK modulation and combining methods to simultaneously transmit the 1-40GHz radio frequency signal and a control signal. This system not only solves signal delay, EVM, bandwidth, and control problems, but also improves the security and reliability of signal transmission.

Description

Technical Field

[0001] The present invention relates to the technical field of radio frequency and optical fiber communication, and in particular to a 1-40 GHz ultra-wideband frequency-converting optical transmission system. Background Art

[0002] With the development of modern information technology, fiber-optic communications are becoming increasingly popular. Currently, fiber-optic communications primarily transmit high-speed digital signals. With the advancement of information technology, secure and reliable transmission technologies are needed to address the challenges of broadband RF signal transmission. Consequently, fiber-optic-based RF transmission technologies have emerged. Currently, there are two approaches to transmitting RF signals over fiber: One is RF digital fiber-optic transmission. This method samples the RF signal through an ADC, converting it into a digital signal. This digital signal is then transmitted via optical fiber to a terminal, which then converts it back into an RF signal. Due to limitations of the ADC, this digital fiber-optic transmission method has a narrow bandwidth, mostly below 200 MHz and no more than 1.2 GHz. The RF signal undergoes amplification, filtering, frequency conversion, conversion, and amplification, generating a large amount of data. This requires very high-speed FPGAs for processing, including clock synchronization, data synchronization, and parallel-to-serial conversion. This results in complex product architectures, large dimensions, and high costs. The complex circuitry also leads to significant signal latency and poor EVM. Due to inherent technical limitations, this transmission method is only suitable for narrowband communications where signal latency is not critical.

[0003] Another approach is to directly overlay RF signals onto optical signals. This transmission principle involves overlaying RF signals onto optical signals for transmission, with the terminal then converting the optical signals back to RF signals. This transmission method overcomes signal latency and EVM issues, but the transmission bandwidth currently only reaches 20 GHz. Existing RF-to-fiber transmission technology cannot meet the bandwidth requirements of specialized applications such as information countermeasures. With the advancement of information technology and the entry of electronic countermeasures into a new stage, the scope of detection and counter-detection is expanding, necessitating an ultra-wideband RF transmission system to address this broadband RF transmission challenge. Summary of the Invention

[0004] To address the above problems, the present invention provides a 1-40GHz ultra-wideband frequency-converted optical transmission system, which emphasizes the 1-40GHz radio frequency signal onto a 1550nm optical signal, and then uses FSK modulation technology and combining technology to simultaneously transmit the 1-40Ghz radio frequency signal and control signal.

[0005] The present invention adopts the following technical solutions:

[0006] A 1-40GHz ultra-wideband frequency-converting optical transmission system, including a transmitting system and a receiving system.

[0007] The transmitting system includes an A1 amplifying unit, an A2 switching unit, a transmitting path unit, an A7 switching unit, an A8 combining unit, an A9 amplifying unit, an A10 matching unit and an A11 modulating unit connected in sequence;

[0008] The A2 switch unit divides the 1-40GHz RF signal into two segments: 1-22GHz and 22-40GHz;

[0009] The A16 control unit and the B16 control unit provide control signals and status information to the transmitting system and the receiving system respectively. The control signals and status information are processed by the control unit and sent to the A14FSK modulation unit, which modulates them into 433MHz RF signals and then combines them with 1-22GHz or 1-19GHz to form 0.4-22GHz or 0.4-19GHz signals;

[0010] The receiving system includes a B1 demodulation unit, a B2 matching unit, a B3 amplification unit, a B4 branching unit, a B5 switch unit, a receiving path unit, a B11 switch unit, and a B12 amplification unit connected in sequence;

[0011] The B1 demodulation unit demodulates the received optical signal to obtain a 0.4-22 GHz RF signal. After amplification, the RF signal is split into a 1-22 GHz RF signal and a 0.43 GHz RF signal by the B4 splitter unit. The RF signal is then switched into two signals by the B5 switch unit: the 1-22 GHz RF signal is directly filtered, and the 1-19 GHz RF signal is first frequency-converted and then filtered and amplified.

[0012] The A15 power supply unit and the B15 power supply unit provide power to the transmitting system and the receiving system respectively;

[0013] The received RF signal separated by the B4 branch unit is restored into a digital control signal by the B17FSK modulation unit. The digital control signal is processed by the control unit and controls the B5 switch unit to switch, so that the frequency of the receiving system is consistent with the frequency of the transmitting system. That is, if the transmitting system is a 1-22GHz signal, the RF signal does not pass through the receiving system's frequency conversion channel; if the transmitting system is a 22-40GHz signal, the RF signal passes through the receiving system's frequency conversion channel.

[0014] Preferably, the transmitting path unit includes a transmitting system frequency conversion channel and an A13 filtering unit connected in parallel with the transmitting system frequency conversion channel. The transmitting system frequency conversion channel includes an A3 filtering unit, an A4 mixing unit, an A5 filtering unit, and an A6 amplifying unit connected in sequence; the A4 mixing unit is connected to an A11 local oscillator unit;

[0015] Preferably, the receiving path unit includes a B13 filter unit, a receiving system frequency conversion channel connected in parallel with the B13 filter unit, and the receiving system frequency conversion channel includes a B6 filter unit, a B7 mixing unit, a B8 filter unit, a B9 amplification unit, and a B10 filter unit connected in sequence, and the B7 mixing unit is connected to a B14 local oscillator unit.

[0016] Preferably, the A1 amplifying unit, A6 amplifying unit, A9 amplifying unit, B3 amplifying unit, B9 amplifying unit, and B12 amplifying unit are all broadband amplifiers; the operating frequencies of the A1 amplifying unit and the B12 amplifying unit are 1-40 GHz, respectively, the operating frequencies of the A6 amplifying unit and the B9 amplifying unit are 1-19 GHz, respectively, and the operating frequencies of the A9 amplifying unit and the B3 amplifying unit are 0.4-22 GHz, respectively.

[0017] Preferably, the A2 switch unit and the B11 switch unit are PIN switches with an operating frequency of 1-40 GHz; the A7 switch unit and the B5 switch unit are FET switches with an operating frequency of 1-22 GHz.

[0018] Preferably, the A3 filter unit and the B8 filter unit are high-pass filters with a passband operating frequency of 22-40 GHz; the A5 filter unit and the B6 filter unit are low-pass filters with a passband operating frequency of 1-19 GHz; the A13 filter unit and the B13 filter unit are low-pass filters with a passband operating frequency of 1-22 GHz;

[0019] Preferably, the power supply unit and the control unit are both connected to the J30J connector; the A11 modulation unit and the B1 demodulation unit are connected to the optical fiber interface FC / APC;

[0020] The beneficial effects of the present invention are:

[0021] 1. The present invention adopts bare chip amplification design, broadband frequency mixing design, LD laser modulation design, FSK modulation design, PIN demodulation design, and FSK demodulation design to achieve 1-40GHz ultra-wideband frequency conversion optical transmission, with a maximum operating frequency of 40GHz and an operating bandwidth of approximately 40GHz. At the same time, FSK debugging is used to enable the transmitting subsystem to remotely control the receiving subsystem;

[0022] 2. The present invention improves the transmission frequency and bandwidth of the signal, enhances the security and reliability of the transmission, and also reduces the transmission delay of the signal, reduces the transmission power loss and product power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present invention, but are not intended to limit the present invention.

[0024] Figure 1 Schematic diagram of the structure of the launch system of the present invention;

[0025] Figure 2 Schematic diagram of the receiving system structure of the present invention;

[0026] Figure 3 This is a simulation result diagram of the 1-40 GHz cascaded gold wire standing wave ratio of the present invention;

[0027] Figure 4 This is a diagram showing the simulation results of the 1-40 GHz cascade gold wire insertion loss of the present invention;

[0028] Figure 5 Graph showing the gain simulation results of the present invention;

[0029] Figure 6 It is the standing wave ratio simulation result diagram of the present invention;

[0030] As shown in the figure

[0031] 1—A1 amplifier unit, 2—A2 switch unit, 3—A3 filter unit, 4—A4 mixer unit, 5—A5 filter unit, 6—A6 amplifier unit, 7—A7 switch unit, 8—A8 combiner unit, 9—A9 amplifier unit, 10—A10 matching unit, 11—A11 modulation unit, 12—A12 local oscillator unit, 13—A13 filter unit, 14—A14 FSK modulation unit, 15—A15 power supply unit, 16—A16 control unit;

[0032] 21—B1 demodulation unit, 22—B2 matching unit, 23—B3 amplification unit, 24—B4 branching unit, 25—B5 switch unit, 26—B6 filter unit, 27—B7 mixing unit, 28—B8 filter unit, 29—B9 amplification unit, 30—B10 filter unit, 31—B11 switch unit, 32—B12 amplification unit, 33—B13 filter unit, 34—B14 local oscillator unit, 35—B15 power supply unit, 36—B16 control unit, 37—B17 FSK modulation unit; DETAILED DESCRIPTION

[0033] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] The present invention will be further described below with reference to the accompanying drawings and examples.

[0035] like Figures 1 to 4 As shown, a 1-40 GHz ultra-wideband frequency-converting optical transmission system includes a transmitting system and a receiving system;

[0036] The transmitting system includes an A1 amplifying unit, an A2 switching unit, a transmitting path unit, an A7 switching unit, an A8 combining unit, an A9 amplifying unit, an A10 matching unit and an A11 modulating unit connected in sequence;

[0037] The input end of the A1 amplifying unit is connected to a 2.92mm RF connector;

[0038] The transmitting path unit includes a transmitting system frequency conversion channel and an A13 filtering unit connected in parallel with the transmitting system frequency conversion channel. The transmitting system frequency conversion channel includes an A3 filtering unit, an A4 mixing unit, an A5 filtering unit, and an A6 amplification unit connected in sequence; the A4 mixing unit is connected to an A12 local oscillator unit.

[0039] The A2 switch unit is a PIN switch that divides the 1-40 GHz RF signal into two segments: 1-22 GHz and 22-40 GHz. The 1-22 GHz segment signal is directly filtered; the 22-40 GHz segment signal is first filtered and then mixed with the 21 GHz local oscillator signal to generate a 1-19 GHz signal, which is then filtered and amplified.

[0040] The power supply unit and control unit connected to the J30J connector provide power, control signals and status information to the launch system;

[0041] The A16 control unit provides control signals and status information for the transmission system. The control signals and status information are processed by the MCU in the control unit and sent to the A14FSK modulation unit, which modulates them into a 433MHz RF signal and combines it with the main signal to form a 0.4-22GHz signal.

[0042] The 0.4-22GHz RF signal is matched and sent to the A11 modulation unit, which finally outputs a 1550nm optical signal after modulation;

[0043] The A8 combining unit combines the 433MHzFSk modulated signal and the 1-22GHz broadband signal into one channel for transmission.

[0044] The receiving system includes a B1 demodulation unit, a B2 matching unit, a B3 amplification unit, a B4 branching unit, a B5 switch unit, a receiving path unit, a B11 switch unit, and a B12 amplification unit connected in sequence;

[0045] The receiving path unit includes a B13 filter unit and a receiving system frequency conversion channel connected in parallel with the B13 filter unit. The receiving system frequency conversion channel includes a B6 filter unit, a B7 mixing unit, a B8 filter unit, a B9 amplification unit, and a B10 filter unit connected in sequence. The B7 mixing unit is connected to a B14 local oscillator unit.

[0046] The B1 demodulator unit connected to the FC / APC optical connector demodulates the received 1550nm optical signal to obtain a 0.4-22GHz RF signal. After amplification, the RF signal is split into a 1-22GHz RF signal and a 0.43GHz RF signal by the B4 splitter unit. The RF signal is then switched into two signals by the B5 switch unit: a 1-22GHz RF signal and a 1-19GHz RF signal.

[0047] After filtering, the 1-19 GHz signal is mixed with the local oscillator unit to generate a 22-40 GHz RF signal, which is then filtered and amplified.

[0048] The 1-22 GHz RF signal is filtered and then switched with the 22-40 GHz RF signal through the B11 switch unit for amplification and output, thus achieving 1-40 GHz broadband transmission.

[0049] The 0.43GHz RF signal separated by the B4 branch unit is converted into a digital control signal by the B17FSK modulation unit. The digital control signal is processed by the control unit and controls the B5 switch unit to switch, so that the frequency of the receiving system is consistent with the frequency of the transmitting system. That is, if the transmitting system is a 1-22GHz signal, the RF signal does not pass through the receiving system frequency conversion channel; if the transmitting system is a 22-40GHz signal, the RF signal passes through the receiving system frequency conversion channel. The B4 branch unit divides the 0.43-22GHz broadband signal into a 433MHzFSk modulated signal and a 1-22GHz broadband signal.

[0050] The A15 power supply unit and the B15 power supply unit provide power to the transmitting system and the receiving system respectively;

[0051] The A1 amplifying unit, A6 amplifying unit, A9 amplifying unit, B2 amplifying unit, B9 amplifying unit, and B12 amplifying unit are all broadband amplifiers. The operating frequencies of the A1 amplifying unit and the B12 amplifying unit are 1-40 GHz, the operating frequencies of the A6 amplifying unit and the B9 amplifying unit are 1-19 GHz, and the operating frequencies of the A9 amplifying unit and the B3 amplifying unit are 0.4-22 GHz.

[0052] The A2 switch unit and the B11 switch unit are PIN switches with an operating frequency of 1-40 GHz; the A7 switch unit and the B5 switch unit are FET switches with an operating frequency of 1-22 GHz.

[0053] The A3 and B8 filter units are high-pass filters with a passband operating frequency of 22-40 GHz; the A5 and B6 filter units are low-pass filters with a passband operating frequency of 1-19 GHz; the A13 and B13 filter units are low-pass filters with a passband operating frequency of 1-22 GHz.

[0054] The A15 power supply unit, B15 power supply unit, A16 control unit, and B16 control unit are all connected to the J30J connector; the A11 modulation unit and B1 demodulation unit are connected to the optical fiber interface FC / APC;

[0055] The A14 local oscillator unit and the B14 local oscillator unit provide the local oscillator signals required for frequency conversion for the transmitting system and the receiving system respectively, and are both composed of a phase-locked loop circuit, a filter circuit, an amplifier circuit, a frequency multiplication circuit, and a power supply circuit;

[0056] The A14FSK modulation unit and the B17FSK modulation unit are both composed of an FSK modulator, a filter circuit, and a power supply circuit;

[0057] The A15 power supply unit and the B15 power supply unit are both composed of a DC / DC circuit, an LDO circuit, a negative voltage conversion circuit, and an EMI filter circuit;

[0058] The A16 control unit and the B16 control unit are both composed of a crystal oscillator circuit, an MCU circuit, and a digital level conversion circuit;

[0059] The A11 modulation unit is composed of LD laser, driving circuit, monitoring circuit and TEC cooling control circuit;

[0060] The B1 demodulation unit is composed of a PIN detector, a driving circuit, and an optical power monitoring circuit;

[0061] The A4 mixing unit and the B7 mixing unit are both composed of a mixing chip and a matching circuit;

[0062] The A2 switch unit, A7 switch unit, B5 switch unit and B11 switch unit are each composed of a switch chip, a bias circuit, a power supply circuit and a control circuit;

[0063] The A1 amplifying unit, A6 amplifying unit, A9 amplifying unit, B3 amplifying unit, B9 amplifying unit, and B12 amplifying unit are each composed of an amplifier, a bias circuit, and a power supply circuit, and have an operating frequency of 0.4-40 GHz and a bandwidth of up to 40 GHz;

[0064] The working principle of the present invention is as follows

[0065] When the transmitting system inputs a 1-40GHz RF signal, the control unit will receive a segmentation instruction for the input frequency range. The control unit of the transmitting system controls the switching of the A5 switch unit and controls the A14FSK modulation unit to send a switch control signal. After receiving the information, the receiving system first demodulates it to the control unit, and the control unit then controls the switching of the A5 switch unit.

[0066] The broadband RF signal is processed and output through different channels:

[0067] 1. 1-22GHz RF signal is output after amplification-switching-filtering-switching-amplification-modulation-demodulation-matching-amplification-switching-filtering-switching-amplification;

[0068] 2. The 22-40 GHz RF signal is output after amplification-switching-mixing-switching-modulation-demodulation-amplification-switching-mixing-switching-amplification;

[0069] like Figures 3 to 6 As shown in the figure, the units of the present invention are connected by gold wire or gold wire + RT5880 soft substrate. To achieve high-frequency transmission, the gold wire length is controlled within 0.8mm as much as possible, and the assembly gap between each unit and other materials is controlled at 0.03mm. HFSS simulation shows that the standing wave ratio of a single bonding point is ≤1.3 and the loss is ≤0.3dB, meeting the system design requirements.

[0070] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the present profession can make some changes or modifications to equivalent embodiments of the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A 1-40 GHz ultra-wideband frequency conversion optical transmission system, characterized in that: Including transmitting system and receiving system, The transmitting system includes an A1 amplifying unit, an A2 switching unit, a transmitting path unit, an A7 switching unit, an A8 combining unit, an A9 amplifying unit, an A10 matching unit and an A11 modulating unit connected in sequence; The A2 switch unit divides the input RF signal into two signals of different frequencies; The transmitting path unit includes a transmitting system frequency conversion channel and an A13 filtering unit connected in parallel with the transmitting system frequency conversion channel. The transmitting system frequency conversion channel includes an A3 filtering unit, an A4 mixing unit, an A5 filtering unit, and an A6 amplifying unit connected in sequence; the A4 mixing unit is connected to an A12 local oscillator unit required for frequency conversion; The A16 control unit provides control signals and status information for the transmission system. After being processed by the control unit, the control signals and status information are sent to the A14 FSK modulation unit, which modulates them into a specific frequency radio frequency signal and then combines them with the main signal to form a transmission radio frequency signal. The receiving system includes a B1 demodulation unit, a B2 matching unit, a B3 amplification unit, a B4 branching unit, a B5 switch unit, a receiving path unit, a B11 switch unit, and a B12 amplification unit connected in sequence; The B1 demodulation unit demodulates the received optical signal to obtain a radio frequency signal. After amplification, the radio frequency signal is split into two radio frequency signals of different frequencies by the B4 branching unit. One radio frequency signal is sent to the B17 FSK modulation unit for demodulation and output as a control signal. The other radio frequency signal is switched into two signals by the B5 switch unit for processing. The A15 power supply unit provides the required power for the transmitting system, and the B15 power supply unit provides the required power for the receiving system; The B16 control unit provides control signals and status information to the receiving system; The received RF signal separated by the B4 branch unit is restored to a digital control signal by the B17 FSK modulation unit. The digital control signal is processed by the control unit and controls the B5 switch unit to switch, so that the frequency of the receiving system is consistent with the frequency of the transmitting system.

2. The 1-40 GHz ultra-wideband frequency conversion optical transmission system according to claim 1, characterized in that: The receiving path unit includes a B13 filtering unit, a receiving system receiving system frequency conversion channel connected in parallel with the B13 filtering unit, and the receiving system receiving system frequency conversion channel includes a B6 filtering unit, a B7 mixing unit, a B8 filtering unit, a B9 amplifying unit, and a B10 filtering unit connected in sequence. The B7 mixing unit is connected to a B14 local oscillator unit.

3. The 1-40 GHz ultra-wideband frequency conversion optical transmission system according to claim 2, characterized in that: The A1 amplifying unit, A6 amplifying unit, A9 amplifying unit, B3 amplifying unit, B9 amplifying unit, and B12 amplifying unit are all broadband amplifiers; the operating frequencies of the A1 amplifying unit and the B12 amplifying unit are 1-40 GHz, respectively, the operating frequencies of the A6 amplifying unit and the B9 amplifying unit are 1-19 GHz, respectively, and the operating frequencies of the A9 amplifying unit and the B3 amplifying unit are 0.4-22 GHz, respectively.

4. A 1-40 GHz ultra-wideband frequency conversion optical transmission system according to any one of claims 1 to 3, characterized in that: The A2 switch unit and the B11 switch unit are PIN switches with an operating frequency of 1-40 GHz; the A7 switch unit and the B5 switch unit are FET switches with an operating frequency of 1-22 GHz.

5. A 1-40 GHz ultra-wideband frequency conversion optical transmission system according to any one of claims 1 to 3, characterized in that: The A3 filter unit and the B8 filter unit are high-pass filters with a passband operating frequency of 22-40 GHz; the A5 filter unit and the B6 filter unit are low-pass filters with a passband operating frequency of 1-19 GHz; the A13 filter unit and the B13 filter unit are low-pass filters with a passband operating frequency of 1-22 GHz.

6. A 1-40 GHz ultra-wideband frequency conversion optical transmission system according to any one of claims 1 to 3, characterized in that: The power supply unit and the control unit are both connected to the J30J connector; the A11 modulation unit and the B1 demodulation unit are connected to the optical fiber interface FC / APC.

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