The improvement of networking speed requires faster memory and serial bus communication. Peripheral component high speed interconnect (PCIe) ®） The expansion bus has been upgraded from PCIe 4.0 to PCIe 5.0 to meet the demand for higher speed. The same is true for memory. Double speed (DDR) memory has evolved from DDR 4.0 to DDR 5.0. With the improvement of serial data communication speed, accurate high-speed testing is needed at each level. When testing at a higher speed, it is necessary to perform all-round conformance testing for all the latest standards.

Plasma is one of the four basic forms of matter. In recent years, it has been widely used in energy, materials and national defense. Microwave reflection method is one of the common methods for microwave diagnosis of plasma. It is usually used to determine the electron density distribution and electron density disturbance of plasma. In plasma, the critical interface position of reflected microwave changes with the change of incident microwave frequency. By changing the frequency of incident microwave and measuring the phase change of reflected wave and reference wave by reflectometer, the electron density distribution of plasma can be obtained; If the frequency of the incident microwave remains constant, the disturbance of the plasma density can be measured.

Microwave anechoic chamber is used to simulate the free space environment. The six sides inside the shielding structure of the anechoic chamber are paved with microwave absorbing materials to reduce all reflected waves (including diffraction and scattering waves) to a low degree. It is mainly used for parameter measurement of microwave antenna system, radar reflection section test, electronic warfare and simulation. Ribes provides customers with darkroom RF and microwave solutions, ultra wideband solutions, such as 0.1-40ghz or millimeter wave (W-band).

Millimeter wave ROF system has the characteristics of large capacity, light equipment and strong anti-interference ability. It is suitable for train ground communication of high-speed railway and establishes wireless communication modes such as Pico cellular, which has great market potential. In order to reduce the cost and improve the system stability, the structure of millimeter wave ROF system is simplified, and the optical carrier direct QPSK modulation ROF system for the purpose of high-speed data transmission is adopted; Seek a series of problems such as how to obtain pure local oscillator in the uplink transmission of optical direct modulation ROF system, and the impact of optical fiber dispersion on high-speed millimeter wave ROF system, so as to improve the existing millimeter wave ROF system and meet the needs of the future development of wireless communication system.

Because of its broadband characteristics, terahertz band has great application potential in the fields of communication, radar, characteristic spectrum detection and so on. In order to make the data rate of short-range wireless communication reach 10Gbps, a terahertz wireless communication system is established by using photoelectric combination technology with THz band (125ghz) as the carrier. As shown in the figure below, the 62.5ghz signal is used to modulate the optical wave, and the optical signal separated by 0.125thz is generated through the plane wave division circuit. The optical signal is modulated by the transmitted data, and then enters the PD for photoelectric conversion to generate the 0.125th group of modulated waves. After amplification, it is fed into the antenna for transmission, and the receiving end enters the low-noise amplifier after passing through the antenna. After detection, it becomes a baseband signal. After amplification, the data is recovered.