Optoelectronic hybrid millimeter wave ultra-wideband mirror frequency rejection receiver device

Abstract

This invention discloses an optoelectronic fusion millimeter-wave ultra-wideband image suppression receiver device, applied in the field of ultra-wideband communication and radio frequency reception technology. It addresses the problem that existing receiver technologies cannot meet the requirements of multi-band, high-fidelity ultra-wideband reception applications. This invention achieves continuous tuning of the local oscillator frequency from several GHz to hundreds of GHz by independently setting an optically generated local oscillator module with wide tuning capability, adapting to multi-band reception requirements. The multi-wavelength parallel processing capability of the optical comb technology allows for baseband signal extraction without complex channelization. Furthermore, by increasing the signal amplitude through intermediate frequency conversion, it effectively adapts to the driving requirements of electro-optic modulators. Combined with orthogonal mixing and electro-optic quadrature modulation architecture, it achieves excellent image suppression performance. This invention simultaneously solves four core problems: difficulty in adapting large instantaneous bandwidth modulation drives, poor high-frequency local oscillator phase noise performance, poor image suppression effect, and insufficient multi-band adaptability. It has significant engineering application value and technological innovation.

Description

Technical Field

[0001] This invention belongs to the field of ultra-wideband communication and radio frequency reception technology, and specifically relates to an ultra-wideband image frequency suppression receiver device. Background Technology

[0002] As wireless communication systems develop towards higher frequencies and larger bandwidths, there is an urgent need for ultra-wideband receivers with ultra-large instantaneous bandwidth, flexible multi-band adaptation, high receiving sensitivity, and low cost and miniaturization.

[0003] Currently, existing ultra-wideband millimeter-wave receiver technologies are mainly based on traditional all-electronic solutions. Insufficient image rejection performance is the primary bottleneck restricting their engineering applications in high-frequency ultra-wideband scenarios. When processing ultra-wideband signals of hundreds of GHz, traditional electronic receivers face inherent technical limitations in image rejection: the relative frequency interval between the image frequency and the target RF signal is extremely narrow in the millimeter-wave high-frequency band, and the quality factor of traditional electrical domain filters decays sharply with increasing operating frequency, making it impossible to achieve narrowband high-suppression image filtering. At the same time, traditional electronic receivers are also limited by the inherent bandwidth bottleneck of electronic devices. When processing ultra-wideband signals of hundreds of GHz, they require complex channelization architectures, making parallel coordination of multiple ADCs difficult, and also facing engineering problems such as excessive power consumption and severe heat generation, making it difficult to meet the application requirements of large bandwidth. Although early optoelectronic fusion solutions have overcome the bandwidth limitations of electrical domain devices to some extent, their local oscillator modules mostly use traditional electronic local oscillators, which not only have limited frequency tuning range, but also suffer from inherent defects such as sharp deterioration of phase noise, insufficient output power, and poor amplitude-phase consistency of orthogonal two-channel systems in the high-frequency band, further reducing the system's image rejection performance. Summary of the Invention

[0004] To address the aforementioned technical challenges, this invention proposes an optoelectronic fusion millimeter-wave ultrawideband image frequency suppression receiver device. Through an innovative architecture involving RF-IF conversion, independent optical generation local oscillator, large-bandwidth optical domain processing, and optical comb baseband extraction, it achieves high-fidelity reception of ultra-large instantaneous bandwidth signals while ensuring efficient image frequency suppression, thus meeting the core requirements of high-speed communication and ultrawideband detection.

[0005] The technical solution adopted in this invention is as follows: a photoelectric fusion millimeter-wave ultra-wideband mirror frequency suppression receiver device, comprising: an ultra-wideband signal receiving antenna, a first low-noise amplifier (LNA), an optically generated millimeter-wave local oscillator module 1, a quadrature mixing circuit module 2, an electro-optic quadrature modulation module 3, and a signal processing module 4; the signal received by the ultra-wideband signal receiving antenna is amplified by the first low-noise amplifier (LNA), and the LNA outputs a radio frequency signal. The optical millimeter-wave local oscillator module 1 generates two orthogonal local oscillator signals, which are then sent to the quadrature mixing circuit module 2.

[0006] The input RF signal of the quadrature mixer circuit module (2) Including expected sidebands With mirrored side strip via I Road With Q Road After local oscillator mixing, two intermediate frequency I / Q signals are output; It is half the amplitude of the useful radio frequency signal. The frequency of the useful radio frequency signal. It is half the amplitude of the image frequency signal. The frequency of the image signal;

[0007] Two intermediate frequency I / Q signals are sent to the electro-optic quadrature modulation module, which modulates the electro-intermediate frequency I / Q onto the optical carrier to achieve quadrature optical modulation and output optical signals. At the same time, the mirror terms are phase-opposite and cancel each other out. Finally, the optical signal enters the signal processing module (4), and after being processed by the signal processing module (4), a complete received signal is output.

[0008] Quadrature mixer module 2 first converts the radio frequency signal into a frequency signal. The signal is divided into two radio frequency signals with equal amplitude and phase. These two radio frequency signals are mixed with one of the two quadrature local oscillator signals generated by the optical millimeter wave local oscillator module 1 to obtain two intermediate frequency output signals.

[0009] The electro-optic quadrature modulation module includes a laser 301, an electro-optic modulator 302, a bias control unit 303, an optical filter 304, and an optical fiber amplifier 305; the optical carrier output by the laser 301... The signal is transmitted to the electro-optic modulator 302, and the bias control unit 303 controls the bias voltage. and The electro-optic modulator 302 is operated at the quadrature operating point. The electro-optic modulator 302 adopts a dual-drive Mach-Zehnder modulator. The two intermediate frequency output signals generate a 90-degree optical phase difference through the dual-drive Mach-Zehnder modulator. The dual-drive Mach-Zehnder modulator outputs the modulated optical signal. The tunable optical filter 304 is used to filter the modulated optical signal. The erbium-doped fiber amplifier 305 is used to amplify the power of the filtered optical signal.

[0010] The optical signal output from the erbium-doped fiber amplifier 305 enters the signal processing module 4, and after processing by the signal processing module 4, the recovered digital signal is obtained.

[0011] The beneficial effects of this invention are as follows: By independently setting up an optically generated local oscillator module with wide tuning capability, continuous tuning of the local oscillator frequency from several GHz to hundreds of GHz can be achieved, adapting to multi-band reception requirements. Furthermore, the multi-wavelength parallel processing capability of the optical comb technology can extract the baseband signal without complex channelization. In addition, by increasing the signal amplitude through intermediate frequency conversion, it can effectively adapt to the driving requirements of electro-optic modulators. Combined with orthogonal mixing and electro-optic orthogonal modulation architecture, excellent image frequency suppression is achieved. This invention simultaneously solves four core problems: difficulty in adapting large instantaneous bandwidth modulation drives, poor high-frequency local oscillator phase noise performance, poor image frequency suppression, and insufficient multi-band adaptability. It has significant engineering application value and technological innovation. The device of this invention has the following advantages:

[0012] 1. This invention adopts an architecture that combines orthogonal mixing structure and electro-optical quadrature modulation technology, achieving a 90-degree phase difference in both the circuit and optical paths, thus achieving excellent image frequency suppression performance;

[0013] 2. The independent optical local oscillator module of the present invention can generate low phase noise local oscillator signals of hundreds of GHz, with phase noise being more than 10dB better than that of traditional electronic local oscillators. This solves the problems of high phase noise and insufficient power of traditional electronic local oscillators in the high-frequency band, and greatly improves the mixing accuracy and receiving sensitivity of high-frequency signals. At the same time, the module has a wide range of frequency tuning capabilities, which can cover the local oscillator requirements from low frequency to terahertz band, and is suitable for multi-frequency receiving scenarios.

[0014] 3. This invention uses an electro-optic quadrature modulation module to realize optical domain processing of signals and uses an optical comb processing unit to directly extract baseband information of large bandwidth signals from the optical domain, breaking through the bandwidth limitation of traditional electronics technology, and the working bandwidth can reach hundreds of GHz;

[0015] 4. This invention uses low-temperature, low-noise amplifiers and high-performance optoelectronic devices, which effectively reduces the noise figure of the system. At the same time, it uses a modular design, which facilitates system integration and maintenance and has good engineering feasibility. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the optoelectronic fusion ultrawideband image frequency suppression receiver of the present invention;

[0017] Figure 2 This is a schematic diagram of the structure of the optically generated millimeter-wave local oscillator module of the present invention;

[0018] Figure 3 This is a schematic diagram of the orthogonal mixer circuit module of the present invention;

[0019] Figure 4 This is a schematic diagram of the electro-optic quadrature modulation module of the present invention;

[0020] Figure 5This is a schematic diagram of the signal processing module of the present invention.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1-Optical millimeter-wave local oscillator module; 101-Laser b; 102-Optical splitter; 103-Phase shifter; 104-PD; 105-Power amplifier PA; 2-Quadrature mixer circuit module; 201-Power divider; 202-Mixer; 203-Filter; 204-Low noise amplifier LNA; 205-Phase shifter; 3-Electro-optic quadrature modulation module; 301-Laser; 302-Electro-optic modulator; 303-Bias control unit; 304-Optical filter; 305-Fiber optic amplifier; 4-Signal processing module; 401-Fiber optic cable; 402-Optical comb processing unit; 403-Optical-to-electrical conversion unit; 404-Analog-to-digital conversion unit; 405-Decoding and error correction unit. Detailed Implementation

[0023] To facilitate understanding of the technical content of this invention by those skilled in the art, the following description, in conjunction with the accompanying drawings, further illustrates the invention.

[0024] like Figure 1 As shown, an optoelectronic fusion millimeter-wave ultra-wideband mirror-frequency suppression receiver device includes: an ultra-wideband signal receiving antenna, a low-noise amplifier (LNA), an optically generated millimeter-wave local oscillator module 1, a quadrature mixer circuit module 2, an electro-optic quadrature modulation module 3, and a signal processing module 4. The signal received by the antenna is amplified by the LNA and then output as a radio frequency signal. To the quadrature mixer circuit module 2.

[0025] like Figure 2 As shown, the optically generated millimeter-wave local oscillator module includes a laser b 101, an optical splitter 102, an optical phase shifter 103, a photodetector PD 104, and a power amplifier PA 105.

[0026] Lasers a and b are distributed feedback lasers, characterized by narrow linewidth and high stability, exhibiting excellent long-term frequency stability. They provide high-quality optical carriers for optical domain signal processing, and their output frequencies are respectively... , The continuous optical carrier is then split into two equal optical signals by their respective optical splitters 102. The photodetector PD 104 uses the photoelectric beat frequency effect to beat the split laser signals in pairs, generating two identical local oscillator signals. One of these signals is input to the phase shifter 103 for a 90° phase shift, finally outputting two orthogonal local oscillator signals. and , This represents a time variable. For example, when a 100GHz millimeter-wave local oscillator signal needs to be generated, the center wavelength of laser a can be set to 1550.00nm, and the center wavelength of laser b can be set to 1549.20nm. The two continuous optical signals with a frequency difference of 100GHz are beat-frequency in the photodetector PD104, which can directly convert the optical frequency difference into a high-frequency millimeter-wave electrical signal.

[0027] Regarding phase noise control, traditional electronic local oscillators typically require multiple frequency multiplications using a low-frequency crystal oscillator to generate signals up to 100 GHz. Each frequency multiplication leads to deterioration of phase noise. The optically generated local oscillator used in this invention skips the electrical frequency multiplication process, and the phase noise of its output signal is mainly determined by the relative frequency jitter of the two lasers. By combining it with a highly stable narrow-linewidth laser, the generated 100 GHz local oscillator signal achieves an extremely low level of phase noise compared to traditional electrical local oscillator signals generated through multiple frequency multiplications in the same frequency band.

[0028] The power amplifier PA 105 is a GaN high-power amplifier with high gain and high linearity. It can amplify high-frequency local oscillator signals and output two quadrature local oscillator signals to the quadrature mixer circuit module.

[0029] The expressions for the two orthogonal local oscillator signals are as follows:

[0030]

[0031]

[0032] This represents the amplitude of the local oscillator signal.

[0033] like Figure 3 As shown, the quadrature mixer circuit module includes a power divider 201, a mixer 202, a filter 203, a low-noise amplifier (LNA) 204, and a phase shifter 205.

[0034] The power divider 201 employs a high-isolation power divider, such as a Wilkinson power divider or other planar power divider, or a waveguide power divider with a π-type matched load, to divide the input radio frequency signal... The two RF signals, with equal amplitude and phase, form the basis for subsequent mixing. In this example, mixer 202 uses a GaAs Schottky diode mixing structure, flip-chip soldered onto a quartz ceramic substrate with gold solder. This structure features low loss and high linearity, enabling efficient mixing of the RF signal and the local oscillator signal. The two mixers respectively mix the two RF signals with the quadrature local oscillator signal output from the optically generated local oscillator module. and The mixing process is performed to mix the high-bandwidth radio frequency signal to the intermediate frequency range. The intermediate frequency signal output by the mixer is sequentially filtered by filter 203 to remove mixing spurious signals, amplified by low-noise amplifier 204, and the phase shifter 205 is used to accurately calibrate the phase error of the I / Q channels, while increasing the signal power to meet the driving requirements of the electro-optic modulator.

[0035] Radio frequency signals received by the antenna Includes radio frequency signals and image frequency signal The signal is represented as follows:

[0036]

[0037] The local oscillator signal in the quadrature mixer circuit is an optically generated millimeter-wave local oscillator. and .

[0038] After passing through the power divider, the input signal becomes two signals with equal amplitude and phase:

[0039]

[0040] It is half the amplitude of the useful radio frequency signal. The frequency of the useful radio frequency signal. It is half the amplitude of the image frequency signal. The frequency of the image signal;

[0041] via mixer I channel With Q Road The two intermediate frequency I / Q signals after local oscillator mixing are:

[0042]

[0043] like Figure 4 As shown, the electro-optic quadrature modulation module includes a laser 301, an electro-optic modulator 302, a bias control unit 303, an optical filter 304, and an optical fiber amplifier 305.

[0044] The optical carrier wave output by the laser 301 The signal is transmitted to the electro-optic modulator 302. The electro-optic modulator 302 employs a dual-drive Mach-Zehnder modulator (DDMZM), featuring two independent RF drive ports, enabling efficient conversion from electrical to optical signals and supporting ultra-wideband signal modulation. The mixer circuit outputs two intermediate frequency electrical signals. and It is converted into an optical signal by an opto-modulator, under a bias voltage. and With assistance, a 90-degree optical signal difference can be achieved.

[0045] The total input signal for the upper and lower arms of the DDMZM is:

[0046]

[0047] The phase difference generated by the upper and lower signals is:

[0048]

[0049] In the formula, This represents the half-wave voltage, where the phases of the two signals are:

[0050]

[0051] In the formula, Given the initial phase, the total phase difference is:

[0052]

[0053] The output light intensity at this time is:

[0054]

[0055] That is, the two signals generate a 90-degree optical phase difference through a dual-drive photoelectric modulator. The effect of this 90-degree phase difference on the original signals is as follows:

[0056]

[0057] The output information of the optical signal is:

[0058]

[0059] The frequency of the image signal Some of the image frequency has been eliminated, achieving the effect of image frequency suppression, while outputting an optical signal containing signal information.

[0060] The bias control unit 303 controls the bias voltage. and The optoelectronic modulator is stably operated at its quadrature operating point, ensuring system stability and performance optimization. The tunable optical filter 304 filters the modulated optical signal, selecting the desired frequency components and suppressing noise and interference. The erbium-doped fiber amplifier 305 amplifies the filtered optical signal, compensating for losses during optical transmission and ensuring sufficient power for transmission to the signal processing module.

[0061] The output of the electro-optic quadrature modulation module is an optical signal. The signal is transmitted to the signal processing module via optical fiber. Utilizing optical domain signal processing, it overcomes the bandwidth limitations of traditional electronics technologies, achieving an operating bandwidth of hundreds of GHz.

[0062] like Figure 5 As shown, the signal processing module includes an optical fiber 401, an optical comb processing unit 402, an optical-to-electrical conversion unit 403, an analog-to-digital conversion unit 404, and a decoding and error correction unit 405.

[0063] The optical fiber 401 is used to transmit optical signals and features low loss, wide bandwidth, and resistance to electromagnetic interference. The optical comb processing unit 402 can process multiple frequency components simultaneously, employing a coherent optical comb based on a mode-locked laser. The repetition frequency is adjustable, the output comb has ≥100 teeth, and the wavelength spacing uniformity is ≤±0.01nm, enabling parallel signal processing. The opto-to-electric conversion unit 403 uses a high-response PIN photodetector (PD) to efficiently convert the optical signal processed by the optical comb processing unit back to a baseband electrical signal, preserving the baseband signal information. It features wide bandwidth and high responsivity, while also providing a foundation for subsequent digital processing. The analog-to-digital conversion unit 404 can use a low-cost ADC, fully utilizing the advantages of photonics without requiring complex channelization processing. The analog-to-digital conversion unit converts analog electrical signals into digital signals for subsequent digital signal processing. The decoding and error correction unit 405 uses digital signal processing technology to process the digital signal, including signal recovery, error correction, and data optimization, ultimately outputting a complete received signal. The complete meaning here should be understood as the received signal being well received and restored, for example, with excellent image frequency suppression.

[0064] Those skilled in the art will recognize that the embodiments described herein are for the purpose of helping to understand the principles of the invention, and should be understood that the scope of protection of the invention is not limited to such specific statements and embodiments. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the scope of the claims of the invention.

Claims

1. A photoelectric fusion millimeter-wave ultrawideband image frequency suppression receiver device, characterized in that, include: The system comprises an ultra-wideband signal receiving antenna, a first low-noise amplifier (LNA), an optically generated millimeter-wave local oscillator module (1), a quadrature mixer circuit module (2), an electro-optic quadrature modulation module (3), and a signal processing module (4). The signal received by the ultra-wideband signal receiving antenna is amplified by the first low-noise amplifier (LNA), and the LNA outputs a radio frequency signal. The photoelectric millimeter-wave local oscillator module (1) generates two quadrature local oscillator signals to the quadrature mixing circuit module (2). The input RF signal of the quadrature mixer circuit module (2) Including expected sidebands With mirrored side strip via I Road With Q Road After local oscillator mixing, two intermediate frequency I / Q signals are output; It is half the amplitude of the useful radio frequency signal. The frequency of the useful radio frequency signal. It is half the amplitude of the image frequency signal. The frequency of the image signal; Two intermediate frequency I / Q signals are sent to the electro-optic quadrature modulation module, which modulates the electro-intermediate frequency I / Q onto the optical carrier to achieve quadrature optical modulation and output optical signals. At the same time, the mirror terms are phase-opposite and cancel each other out. Finally, the optical signal enters the signal processing module (4), and after being processed by the signal processing module (4), a complete received signal is output.

2. The optoelectronic fusion millimeter-wave ultrawideband image frequency suppression receiver device according to claim 1, characterized in that, The optically generated millimeter-wave local oscillator module includes: a first laser, a second laser, a first optical splitter, a second optical splitter, a first photodetector (PD), a second photodetector (PD), and a phase shifter; the first laser outputs at a frequency of... The continuous optical carrier is split into two optical signals by the first optical splitter, and the output frequency of the second laser is... The continuous optical carrier is split into two optical signals by the second optical splitter. The first optical signal output from the first optical splitter and the first optical signal output from the second optical splitter are beat in pairs by the first photodetector PD to generate the first local oscillator signal. The second optical signal output from the first optical splitter and the second optical splitter are beat in pairs by the second photodetector PD to generate the second local oscillator signal. One of the local oscillator signals is input to the phase shifter for 90° phase shift, and finally two orthogonal local oscillator signals are obtained.

3. The optoelectronic fusion millimeter-wave ultrawideband image frequency suppression receiver device according to claim 2, characterized in that, The quadrature mixer circuit module (2) includes a power divider (201), a first mixer, a second mixer, a first filter, a second filter, a second low-noise amplifier (LNA), a third low-noise amplifier (LNA), a first phase shifter, and a second phase shifter; the power divider (201) divides the input radio frequency signal... Two radio frequency signals of equal amplitude and phase are respectively denoted as the first radio frequency signal and the second radio frequency signal. The first radio frequency signal and one of the two quadrature local oscillator signals generated by the photogenerated millimeter wave local oscillator module (1) are mixed by the first mixer to output the first intermediate frequency signal. The first intermediate frequency signal is then processed by the first filter, the second low noise amplifier (LNA), and the first phase shifter to obtain the first intermediate frequency output signal. The second radio frequency signal and the other of the two quadrature local oscillator signals generated by the photogenerated millimeter wave local oscillator module (1) are mixed by the second mixer to output the second intermediate frequency signal. The second intermediate frequency signal is then processed by the second filter, the third low noise amplifier (LNA), and the second phase shifter to obtain the second intermediate frequency output signal.

4. The optoelectronic fusion millimeter-wave ultrawideband image frequency suppression receiver device according to claim 3, characterized in that, The electro-optic quadrature modulation module includes a laser (301), an electro-optic modulator (302), and a bias control unit (303); the laser (301) outputs an optical carrier wave. The signal is transmitted to the electro-optic modulator (302), and the bias control unit (303) controls the bias voltage. and The electro-optic modulator (302) is operated at the orthogonal operating point. The electro-optic modulator (302) adopts a dual-drive Mach-Zehnder modulator. The two intermediate frequency output signals generate a 90-degree optical phase difference through the dual-drive Mach-Zehnder modulator. The dual-drive Mach-Zehnder modulator outputs the modulated optical signal.

5. The optoelectronic fusion millimeter-wave ultrawideband image frequency suppression receiver device according to claim 4, characterized in that, The electro-optic quadrature modulation module also includes an optical filter (304) for filtering the modulated optical signal.

6. The optoelectronic fusion millimeter-wave ultrawideband image frequency suppression receiver device according to claim 5, characterized in that, The electro-optic quadrature modulation module also includes an erbium-doped fiber amplifier (305) for power amplification of the filtered optical signal.

7. The optoelectronic fusion millimeter-wave ultrawideband image frequency suppression receiver device according to claim 6, characterized in that, The signal processing module (4) includes: optical fiber (401), optical comb processing unit (402), optical-to-electric conversion unit (403), analog-to-digital conversion unit (404), and decoding and error correction unit (405); the optical signal output by the electro-optic quadrature modulation module (3) enters the optical comb processing unit (402) through the optical fiber (401); the optical comb processing unit (402) extracts baseband information from the input optical signal; the optical-to-electric conversion unit (403) converts the optical signal processed by the optical comb processing unit (402) back into a baseband electrical signal; the analog-to-digital conversion unit (404) converts the baseband electrical signal output by the optical-to-electric conversion unit (403) into a digital signal; the decoding and error correction unit (405) performs signal recovery, error correction, and data optimization processing on the digital signal output by the analog-to-digital conversion unit (404) and outputs a complete received signal.

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