345 results about "Microwave technology" patented technology

A preparation method of a self-suspending proppant for hydraulic fracturing is characterized in that solid ceramsite is changed into a porous reinforced structure, a self-repairing function is introduced, bio-based macromolecules are adopted to replace a traditional surfactant, the environmental protection property is improved, nano-deposition and microwave technologies are introduced, the performance is improved, meanwhile, the energy consumption is reduced, and the compression resistance enhancement and self-repairing characteristics are newly added; and the method adapts to more complex stratum working conditions.

The invention provides a broadband tunable low-phase-noise photo-generated microwave signal source and device, and relates to the technical field of photo-generated microwaves. According to the invention, a low-frequency optical pulse and a high-frequency microwave signal are respectively input into the electro-optical sampling phase-locked loop; and the electro-optical sampling phase-locked loop determines the synchronization error of the optical pulse and the microwave signal based on the phase difference between the optical pulse center point and the microwave signal zero crossing point. And taking the synchronization error as a feedback signal, and continuously adjusting the frequency and the phase of the microwave signal by the voltage-controlled oscillation module until the frequency and the phase are synchronized with the Nth harmonic of the optical pulse. By setting different initial frequencies of the voltage-controlled oscillation module, microwave signals with different integral multiple optical pulse frequencies can be obtained, and broadband tuning of photo-generated microwave signals is realized. Furthermore, the repetition frequency of the frequency comb is locked through beat frequency of two beams of reference laser and two adjacent comb teeth, the stability of the reference laser is transmitted to the optical pulse, and the stability of the reference laser is further transmitted to the microwave signal through synchronization of the optical pulse and the microwave signal, so that the phase noise of the photo-generated microwave signal source is reduced.

The invention discloses a relativistic magnetron with an adjustable working mode, and belongs to the technical field of high-power microwaves. The relativistic magnetron comprises a cathode assembly, an anode assembly, an output structure assembly and a tuning assembly, the tuning assembly comprises a tunable short circuit surface, a tuning knob and a telescopic rod. On the basis of the inherent structure of the relativistic magnetron, the position of the short circuit surface in the relativistic magnetron is mechanically adjusted, so that the purpose of switching the working mode and the output signal mode in the resonant cavity is achieved, the problem that the working mode of a traditional relativistic magnetron is single is solved, and multi-frequency-point working of the relativistic magnetron is achieved.

The invention belongs to the technical field of microwave sources in the high-power microwave technology, and particularly relates to a compact full-cavity extraction relativistic magnetron based on metamaterials. Compared with a traditional full-cavity extraction relativistic magnetron based on a metamaterial resonance structure, the compact full-cavity extraction relativistic magnetron based on the metamaterial resonance structure introduces a microwave transmission region behind an anode, and also introduces a metamaterial structure into the microwave transmission region; through the design, microwaves can be radially coupled and output behind the resonant cavity, so that an excitation system can be directly loaded outside the anode block, the inner diameter size of the excitation system is effectively reduced, the miniaturization advantage of the metamaterial is fully played, and the compactness and the light miniaturization degree of the whole high-power microwave system are further improved.

The invention relates to a neural network angle measurement method applied to a beam waveguide reflector antenna, and belongs to the technical field of microwaves. Building a neural network angle measurement system applied to the beam waveguide reflector antenna, wherein the neural network angle measurement system comprises a receiving antenna array and a neural network angle measurement model; acquiring two-dimensional directional diagram data; in a non-uniform radiation field, echo signal amplitude information received by a 16 horn antenna feed source is used as input of an angle measurement system, an azimuth angle and a pitch angle are used as output of the angle measurement system, and neural network training is carried out; and deploying the generated neural network angle measurement model in an echo receiving and processing system. According to the characteristic that different array antenna energy distributions correspond to different echo incident directions, angle measurement is carried out by using a neural network algorithm. According to the angle measurement system trained through the neural network algorithm, an accurate angle measurement result can be obtained.

The invention relates to the technical field of electromagnetic fields and microwaves, and discloses a broadband high-integration-level dual-circularly polarized antenna which comprises an ultra-wideband self-compensation structure plane radiation surface, an ultra-wideband special-shaped reflection cavity, an ultra-wideband impedance transformer and an ultra-wideband integrated dual-polarized feed network. Wherein the ultra-wide-band self-compensation structure plane radiation surface is arranged at the forward position of the ultra-wide-band special-shaped reflection cavity, and radiation of ultra-wide-band dual circularly polarized waves is executed; the ultra-wide-band special-shaped reflection cavity executes matching and forward reflection of ultra-wide-band backward electromagnetic waves; the ultra-wideband impedance transformer executes radio frequency connection and impedance conversion between the ultra-wideband self-compensation structure plane radiation surface and the ultra-wideband integrated dual-polarization feed network; the ultra-wideband integrated dual-polarization feed network performs conversion from an unbalanced signal to a balanced signal and formation of a dual-circularly polarized signal. Unification of directional diagrams, polarization, axial ratio and standing wave bandwidth of more than 15: 1 frequency multiplication can be realized, and the ultra-wideband dual-circular polarization antenna has the advantages of ultra-wideband, miniaturization, constant wave beam and dual-circular polarization.

The invention discloses an internal and external solving method for obtaining electromagnetic scattering characteristics of a cavity-containing target, and relates to the technical field of electromagnetic fields and microwaves, and the method comprises the following steps: decomposing a cavity-containing structure into a cavity internal part and a cavity external part, and building a Huygens equivalent surface on the aperture surface of the boundary between the cavity internal part and the cavity external part; the consistency of electromagnetic modeling solutions before and after internal and external partitioning is ensured by utilizing continuity conditions of current and an electromagnetic field; different solving methods are selected in the inner structure and the outer structure respectively, the interior of the cavity is calculated by combining a cascade method with a rapid direct solving technology, the exterior of the cavity is calculated by adopting a parallel multilayer rapid multi-pole algorithm, and finally, iterative solving of the inner region and the outer region is carried out by utilizing an iterative algorithm, so that the RCS scattering characteristic of the whole cavity-containing structure meeting the calculation requirement is obtained. According to the method, the flexibility of electromagnetic scattering modeling of the target with the cavity is improved, the problem of internal resonance caused by a cavity structure is solved, and the electromagnetic scattering solving capability of the target with the cavity is remarkably improved.

The invention discloses a device and method for simultaneously measuring the two-dimensional angle of arrival and Doppler frequency shift of microwave photons, and belongs to the technical field of optical communication and microwaves, and the device is characterized in that an output port of a laser is connected with an optical input port of a PDM-DPMZM, and an optical output port of the PDM-DPMZM is connected with a common input end of an optical beam splitter; a first output port of the optical beam splitter is connected with a common input port of a first polarization beam splitter PBS1, and two output ports of the PBS1 are respectively connected with two optical input ports of a first balance photoelectric detector BPD1; an output port II of the light beam splitter is connected with a common input port of a polarization beam splitter II PBS2; and two output ports of the PBS2 are respectively connected with two light input ports of a balance photoelectric detector I BPD2. The device is simple in structure, and can solve the problem of low positioning precision in an existing simultaneous arrival angle and DFS measurement scheme.

The invention discloses a relativistic magnetron with an energy feedback structure, and belongs to the technical field of microwaves. The relativistic magnetron is of a full-cavity extraction structure and comprises an anode, a cathode, an energy extraction structure and a guide magnetic field coil. According to the energy extraction structure, an annular microwave reflecting plate is adopted in an output circular waveguide part, part of energy is reflected back to a gap between a cathode and an anode, the interaction between electron cloud and space electromagnetic waves is enhanced, and the output power of a relativistic magnetron is improved. According to the relativistic magnetron, the output power of the relativistic magnetron is effectively improved while the compactness of the device is ensured; meanwhile, the energy feedback structure is simple and easy to process.

The utility model provides a radio frequency device in quantum computing based on module packaging, which can be applied to the technical field of quantum computing and microwaves. The device comprises a high-frequency board, a power board and a packaging shell, the high-frequency board comprises an amplification module and a power division module, the amplification module comprises an amplifier chip and is used for amplifying an input radio-frequency signal, the power division module comprises N stages of power sub-modules, the nth stage of power sub-module comprises 2n paths of output ends, the power division module is used for performing power distribution processing on the radio frequency signals amplified by the amplification module based on the N-stage power division module so as to output multiple paths of target radio frequency signals with coherent phases and the same amplitude from multiple paths of output ends; the power panel is used for converting one path of input voltage input signal into at least one path of voltage output signal and supplying power to the amplification module of the high-frequency board; the packaging shell comprises a main shell, a microwave surface inner cover plate and a main cover plate, and the packaging shell is used for bearing the high-frequency board and the power board and shielding external electromagnetic interference.

The invention discloses a non-metal and metal material gluing and curing method and system based on frequency conversion microwaves. The method comprises the steps that a non-metal material to be glued, a metal material to be glued and an adhesive are obtained; coating and activating a non-metallic material and a metallic material to be glued with an adhesive so as to enhance the permeability and adhesion of the adhesive; and alternately curing the non-metal material and the metal material which are glued by utilizing a frequency conversion microwave technology, controlling the environment atmosphere in the curing process, and cooling after curing is completed. By utilizing the embodiment of the invention, the performance of the adhesive can be effectively improved, so that a stronger bonding effect and better comprehensive performance of the material are realized.

The invention belongs to the technical field of electromagnetic microwaves, and particularly discloses an ultra-wideband wave-absorbing material based on a three-layer metasurface and application of the ultra-wideband wave-absorbing material based on the three-layer metasurface. Each wave-absorbing resonance unit comprises a first resistor loading metasurface layer, a first resistor loading metasurface substrate, a first resistor element, a first resistor loading metasurface supporting dielectric layer, a second resistor loading metasurface substrate, a second resistor loading metasurface layer and a second resistor element which are sequentially arranged from top to bottom; the device comprises a first resistor loading metasurface substrate, a second resistor loading metasurface supporting dielectric layer, a third resistor loading metasurface layer, a third resistor loading metasurface substrate, a third resistor element, a third resistor loading metasurface supporting dielectric layer and a pure metal backboard. According to the ultra-wideband wave-absorbing material based on the three-layer metasurface and the application of the ultra-wideband wave-absorbing material, 90% of ultra-wideband wave absorption can be achieved under a small-size structure, and the ultra-wideband wave-absorbing material has extremely high strategic value in the fields of electromagnetic stealth and the like.

The invention relates to the technical field of radio frequency microwaves, in particular to a reconfigurable radio frequency MEMS attenuator based on an attenuation network, which comprises a plurality of attenuation units, the attenuation units are sequentially connected in series and mounted on a substrate, and the output ends of the attenuation units are provided with signal output lines; the attenuation unit is provided with a Y-type power divider, the input end of the Y-type power divider is connected with a signal input line, the output end of the Y-type power divider is connected with an attenuation circuit and a straight-through circuit in parallel, and the output ends of the attenuation circuit and the straight-through circuit are connected with the signal output line; and the attenuation network is arranged on the attenuation circuit. According to the invention, the parasitic effect can be inhibited and the reflection effect can be reduced.

The invention discloses a single-power-supply ultra-wideband temperature compensation low-noise amplifier circuit, and belongs to the technical field of radio frequency microwaves. The circuit is mainly composed of a pre-stage low-noise amplifier module, an inter-stage temperature compensation equalization module and a post-stage driving amplifier module. The temperature compensation equalizer module generates differential voltage related to temperature through a three-stage gallium arsenide diode temperature sensing unit, outputs a control signal through an enhanced FET differential amplification circuit, drives a voltage-controlled attenuation equalizer to dynamically adjust the attenuation amount of a radio frequency signal, and achieves gain stability in a frequency band. Through the collaborative design of a blocking capacitor and a divider resistor, the grid bias of an FET switch is strictly limited in a transconductance linear adjustment interval, and the interval covers 80% of the effective range of the threshold voltage of a gallium arsenide FET tube. The circuit is powered by a single power supply + 5V, stable work of each module is ensured through active bias and a power supply filter network, and the circuit is suitable for extreme temperature environments such as high-frequency communication and radar.

The invention belongs to the crossing field of a microwave technology and a sensing technology, and particularly relates to a microwave dielectric parameter measurement sensor based on a micro-flow pipeline embedded in a substrate, and one surface of the substrate is provided with a microstrip transmission line and a resonant structure; the microstrip transmission line is used for exciting and transmitting microwave signals; the resonant structure is used for enhancing electromagnetic field distribution in a certain area of the substrate; a micro-flow pipeline is embedded in the substrate and is used for accurately conveying a substance to be detected to an area where electromagnetic energy is most concentrated; a grounding layer is arranged on one side of the substrate and used for restraining an electromagnetic field, and energy of the electromagnetic field is mainly concentrated in the substrate. The micro-flow pipeline is embedded in a strong electric field area in the substrate, so that a to-be-measured substance directly interacts with an electromagnetic energy concentration area, and dielectric parameter measurement which is compact in structure, high in sensitivity and high in precision is achieved. The sensor provided by the invention has wide application prospects in the fields of biomedical detection, chemical analysis, environmental monitoring, industrial process control and the like.

The invention relates to a microwave technology-based PtFe / NF nanosheet rapid preparation method, which is characterized in that chloroplatinic acid, ferric nitrate and foamed nickel are used as raw materials, an ethanol-water mixed solution is used as a solvent, and efficient synthesis of a PtFe / NF nanosheet is realized through a microwave reactor. The preparation technology has the remarkable advantages of being easy and convenient to operate, environmentally friendly, high in reaction rate and the like, the prepared PtFe / NF nanosheet shows good application prospects in the field of electrolytic hydrogen production of alkaline fresh water and alkaline seawater, and an innovative solution is expected to be provided for a hydrogen energy preparation technology.

The utility model relates to the technical field of radio frequency and microwave, in particular to a linearization circuit of a power amplifier, which comprises the power amplifier used for amplifying an input signal and providing required output power; the bias circuit is used for providing bias voltage for the power amplifier and controlling the change characteristic of a quiescent operating point of the power amplifier along with the temperature and the power; the active feedback circuit comprises a first connection point P1, a second connection point P2 and a third connection point P3, the active feedback circuit effectively reduces nonlinear distortion of the power amplifier through a negative feedback mechanism, and the nonlinear distortion of the power amplifier is effectively reduced by adjusting a first resistor R5, a second resistor R4, a third resistor R1 and a fourth resistor R3. The feedback circuit can be controlled to work in a critical region of a saturation region and a linear region, so that the linearity of the power amplifier can be optimized.

This invention discloses a high-efficiency microwave pulse compressor, belonging to the field of high-power microwave technology. It includes a first mode converter, a first transition structure, a dispersion structure, a second transition structure, a second mode converter, and a radiation structure. These components are connected in series. The first mode converter converts the mode of the input microwave pulse into the operating mode of the dispersion structure. The mode-converted microwave pulse is efficiently transmitted to the dispersion structure via the transition structure. The dispersion structure compresses the input frequency-modulated pulse. The second transition structure and the second mode converter convert the compressed high-power short pulse into the microwave mode required for radiation. The radiation structure directionally radiates the high-power short microwave pulse to a space target. This high-efficiency microwave pulse compressor features a simple system, compact structure, and large power capacity. It has good application prospects in microwave source arraying and modularization, and is expected to improve the performance of high-power microwave systems.

The invention discloses a small broadband cavity-backed radiator, which belongs to the technical field of electromagnetic fields and microwaves and comprises a reflection cavity, a loading medium, a printed balun, a printed oscillator, a low-density medium support and double leads. The low-density medium support is used for supporting the printed oscillator; the printed balun and the printed oscillator are electrically connected through double leads; the loading medium is used for adjusting the impedance frequency characteristic of the printed oscillator in the reflection cavity; the printed Balun adopts a strip line-flat plate line-parallel double-line structure and is used for realizing unbalanced-balanced transmission mode conversion and impedance conversion of 3: 1 bandwidth; and the printed oscillator is used for radiating electromagnetic energy and is matched with the multi-ring-groove loading medium and the printed Balun to realize impedance-frequency characteristic balance within a 3: 1 bandwidth range. The small broadband back cavity radiator can effectively solve the problems that in the prior art, the caliber of a reflection cavity of a traditional broadband back cavity radiator is large, the loading effect is not ideal when the bandwidth of a directional diagram is 4 GHz or above, and directional diagram distortion occurs.

The application provides a high-isolation dual-polarized phased array TR assembly based on front and back layouts, and relates to the technical fields of microwave and phased array radar. The assembly comprises a multilayer printed board structure cavity, a first surface of the multilayer printed board structure cavity is provided with a radio frequency link of a first polarization channel, and a second surface is mirror-imaged with a radio frequency link of a second polarization channel; the first surface is opposite to the second surface; the first polarization channel and the second polarization channel are orthogonal polarization channels. The application fundamentally solves the polarization crosstalk problem caused by the traditional side-by-side layout, can improve the dual-polarization isolation to more than 80 dB, optimizes the space utilization and the heat dissipation path, and is particularly suitable for high-density and high-performance dual-polarized phased array antenna systems.

The invention relates to the technical field of microwaves, in particular to a broadband antenna matching system based on a 4: 1 impedance conversion balun, which comprises the 4: 1 impedance conversion balun, an adjustable impedance matching network, a radio frequency monitoring unit and a logic control unit, the logic control unit is configured to receive forward power and reflection power signals and calculate to obtain a standing-wave ratio or a reflection coefficient under a current working frequency point; comparing the standing-wave ratio or the reflection coefficient with a preset threshold value; based on a comparison result, executing an adaptive matching algorithm, and iteratively generating and outputting a new digital control signal to drive a variable reactance element in the adjustable impedance matching network to change the value of the variable reactance element; and through closed-loop feedback control, the impedance of the adjustable impedance matching network is dynamically optimized. By modifying an algorithm parameter or a lookup table in the logic control unit, the same hardware platform can easily adapt to antennas with different impedance characteristics and different frequency bands. And the design flexibility and the product universality are greatly enhanced.

The present invention relates to the field of radio frequency and microwave technologies, and particularly relates to an integrated tunable filter, which includes a tunable filter body. An input strip line, an output strip line, a coupling strip line group, and a YIG thin film structure group are arranged in the tunable filter body. The input strip line can transmit signals to the output strip line through the coupling strip line group and the YIG thin film structure group. Among them, multiple green ceramic sheets are also arranged in the tunable filter body, and the multiple green ceramic sheets are laminated and sintered into a coupling cavity of the tunable filter body. Metal circuit images can be printed on the green ceramic sheets, and resonant cavities for placing the YIG thin film structure group can be dug out on the green ceramic sheets. By arranging each functional component on the green ceramic sheets and then using the LTCC process, the filter can be made into an integrated form, and the assembly is also simpler. There is no need for additional processing of strip lines, etc. Slots can be directly opened on the green ceramic sheets, and the fixation and position control of the YIG thin film structure are more precise, without subsequent adjustment.

A mineral exploration system, comprising: a microwave transmitting module, a Rydberg atomic antenna, and a signal extraction module. The microwave transmitting module and the signal extraction module are each connected to the Rydberg atomic antenna. The microwave transmitting module is used for transmitting detection microwaves into the subsurface, so that the detection microwaves interact with a subsurface structure to generate reflected microwaves. The Rydberg atomic antenna is used for receiving the reflected microwaves and generating a reflected signal on the basis of the reflected microwaves. The signal extraction module is used for extracting a fingerprint signal of the subsurface structure from the reflected signal. By combining the non-invasive nature of microwave technology with the high sensitivity of Rydberg atomic antenna technology, the invention enables in-depth and accurate information extraction of subsurface structures, thereby effectively improving exploration efficiency.

The application discloses an LC band-pass filter based on LTCC technology and relates to the microwave technical field, and at least comprises nine conductor layers; the first conductor layer is a grounding layer, the second conductor layer is an inductance circuit layer, the third conductor layer, the fourth conductor layer, the fifth conductor layer, the sixth conductor layer, the seventh conductor layer, the eighth conductor layer and the ninth conductor layer are all capacitance circuit layers, and the conductor layers are connected through metal through holes. The third conductor layer and the ninth conductor layer are input and output layers of the capacitance circuit and are electrically coupled with the fourth conductor layer and the eighth conductor layer; the second conductor layer and the fourth conductor layer to the eighth conductor layer form a resonator. The application solves the technical problem that the LC band-pass filter occupies a large space, and reduces the volume of the LC band-pass filter.

The invention belongs to the technical field of antennas and microwaves, and discloses an antenna housing integrated array antenna unit and system. The antenna unit comprises a main shell, a parasitic patch layer, an auxiliary shell, a main patch layer, a printed board feed layer, a reflection bottom plate, a radio frequency coaxial connector and screws. According to the antenna unit, broadband wide-angle scanning can be realized through slot coupling and parasitic patch loading; according to the invention, current transmission is destroyed or resonance is caused by slotting and the like, and second and third harmonics are inhibited; by designing the shape of the patch, the link loss can be reduced, and the antenna efficiency is improved; the antenna array plane architecture of the traditional ground radar is that an antenna and an antenna housing are independently designed, and the antenna and the antenna housing are integrally designed, so that the link loss is reduced; the metal layer is plated inside the PPS medium, the PPS medium has characteristics, and the antenna material has a protection function and is good in environmental adaptability.

This disclosure provides a planar resonant cavity for a planar gyrotron and a method for increasing its output power, relating to the field of microwave technology. The planar resonant cavity includes: a resonant cavity for increasing the energy of electromagnetic waves; wherein the energy of the electromagnetic waves gradually increases based on the interaction between the electron beam and the electromagnetic wave; electron emitting surfaces, respectively disposed at the upper and lower ends of the cavity surface in the negative Z direction, for emitting electron beams; wherein the electron emitting surfaces at the upper and lower ends of the cavity surface are symmetrical based on both the central YZ plane and the central XZ plane of the resonant cavity; and baffles, including a left baffle and a right baffle, the left and right baffles having identical structures, respectively disposed in the X direction of the resonant cavity between the electron emitting surfaces and the two ends of the resonant cavity, for reflecting electromagnetic waves to enhance the interaction between the electron beam and the wave, increase the energy of the electromagnetic waves, and increase the output power of the electromagnetic waves.

The invention discloses a P-band high-power filtering and amplitude limiting assembly, which belongs to the technical field of microwaves and comprises a filter, an amplitude limiter, a polarizer, a coupler and a metal cavity. The amplitude limiter is installed on the bottom layer of the metal cavity, the filter and the polarizer are installed on the top layer of the metal cavity, the coupler is installed on the side wall of the metal cavity, the filter, the low-pass filter and the polarizer are connected in a wall-penetrating welding mode through a 50-ohm metal connecting rod, and the polarizer is fixed to the metal cavity through a medium supporting column. The whole assembly belongs to an upper-lower layer structure. According to the assembly, the transmission path between devices is shortened, the emission loss of the assembly is reduced, the size of the filtering and amplitude limiting assembly is greatly reduced under the condition that composite multiple functions are met, and the purposes of high power and high integration are achieved.

The invention relates to the field of microwave technology and electronic devices, and particularly discloses a surface-mounted microstrip circulator with a shielding cavity, which comprises a shielding body provided with six caulking grooves uniformly distributed at intervals along the circumferential direction, the shielding cavity is formed on the shielding body, and a partition plate is arranged in the shielding cavity to divide the shielding cavity into an upper cavity and a lower cavity which are relatively isolated; the gyromagnetic ferrite is arranged in the lower cavity, the gyromagnetic ferrite is fixedly connected to the partition plate, and the corners of the gyromagnetic ferrite are correspondingly embedded into the caulking grooves; the microstrip circuit is arranged below the gyromagnetic ferrite, and the microstrip circuit is provided with three ports; three conductive connecting bodies, wherein each conductive connecting body is correspondingly and electrically connected with each port; the permanent magnet is arranged in the upper cavity and is used for providing a bias magnetic field for the gyromagnetic ferrite; and the cover plate is connected to the shielding body so as to package the permanent magnet in the upper cavity. Therefore, electromagnetic field distribution can be optimized, high-order mode and spurious resonance can be effectively suppressed, and good rigidity and heat dissipation capability can be achieved.

This invention discloses a simple, multifunctional, integrated 5G analog fronthaul in-band full-duplex communication method for remote units (RUs). This method primarily relates to the fields of optical communication technology and microwave technology. The system structure of the method, as shown in Figure 1 of the specification, includes a laser, downlink vector signal, electrical local oscillator signal, downlink interference signal, target signal, reference signal, 90° electrical coupler, dual-polarization quadrature phase-shift keying modulator, phase modulator, single-mode fiber, optical coupler, polarization beamsplitter, polarization beam combiner, polarization controller, polarizer, and photodetector. The remote unit (RU) uses a single phase (PM) modulator to achieve self-interference cancellation (SIC) combined with anti-fiber dispersion transmission and down-conversion, eliminating the need for bias control and additional local oscillator (LO) branches, resulting in a simple structure. At the central office (CO), the carried downlink signal and local oscillator signal are single-sideband modulated to achieve anti-fiber dispersion transmission. The RU uses wavelength reuse technology to perform PM cascaded down-conversion on the signal received from the uplink, and the SIC is moved from the RU to the CO to simplify the RU. The entire link has no optical filter and is reconfigurable.

The present invention discloses a method for synergistically solidifying heavy metal contaminated soil at the estuary of the sea using urease and its modifiers in combination with microwave technology, including: 1. Mix soy flour and deionized water, stir and centrifuge to remove soybean dregs, and take the supernatant as the urease solution; 2. Mix the urea solution and the calcium salt solution to obtain the cementitious liquid; 3. Crush waste concrete waste to obtain fine building aggregates, and add milky quartz powder to make a urease-induced carbonate modifier; 4. Dig the surface heavy metal contaminated soil and mix it with the modifier in step 3, and air-dry it; 5. Add water to the air-dried contaminated soil to the optimal moisture content and backfill it; 6. Lay a white cleaning cloth on the surface of the backfilled contaminated soil, pour the urease solution and the cementitious liquid in sequence, and use the self-weight seepage to make the urease solution and the cementitious liquid penetrate into the interior of the contaminated soil; 7. Turn on the microwave generator to irradiate the soil. The present invention can solidify heavy metal contaminated soil in a high salinity environment, reduce the leaching concentration of heavy metals in the contaminated soil, and improve the strength of the contaminated soil.