The integration of InGaAs photodetectors embedded in a polymer interconnection waveguide on Si and ceramic electrical interconnection substrates has been demonstrated. The photodetector and substrate are independently fabricated and bonded, with subsequent waveguide integration. The embedding fabrication process, coupling, and bandwidth are reported at 1 Gbit/s.

In the engineering use of a magnetically coupled resonant radio energy transmission system, both the resonant frequency and the optimal load impedance will be varied because of the external conditions. In view of the above problems, this paper proposes an RF power supply with adjustable frequency and optimal load impedance, in order to achieve efficient power transmission for different frequency radio energy transmission systems and different load conditions. The RF power supply is mainly composed of a frequency controllable signal generator, a Class E power amplifier circuit, a dynamic impedance matching network, a load detection circuit and a controller. Through the above parts, the load tracking of the RF power supply can be realized, and the higher output efficiency can be realized under the condition of changing the working frequency and the load. Finally, the feasibility of the proposed RF power supply is verified through experiments. The experimental results show that the RF power supply can automatically track changes in the operating frequency and load range, and the output efficiency can be maintained at more than 75%.

This paper investigates the influence of the interactive magnetic field in multi-break vacuum circuit breakers (VCBs) on the arc plasma and the post-arc characteristics. The magnetic field of multi-break VCBs is asymmetric and off-center because of the interactive magnetic field, which is also called bias magnetic field (BMF). The BMF distribution of double-break VCBs is gained by electromagnetic analysis. The test circuit of the magnetic arc blow in multi-break VCBs is established by simplifying as the interaction between the vacuum arc and the BMF. The influence of the magnetic arc blow on the arc plasma is studied by the high-speed CMOS camera and the post-arc current measure. While the vacuum arc is in the direction of the Ampere force with the BMF at 200 mT, it is in the retrograde direction when the BMF is below 100 mT, which results in the post-arc charge obviously varying from 9 μC to 50 μC. The relationship between the BMF and the post arc charge is gained. The mechanism of the magnetic arc blow in multi-break VCBs is discussed. Therefore, this paper can provide the base of construct and configuration to avoid the influence of the magnetic arc blow.

It is a valuable subject for academic community how to limit the short-circuit current within the breaking capacity of breakers at all levels. Liquid metal current limiter (LMCL) can tackle this challenge with its unique advantages. However, liquid metal and cavity of the existing LMCL are severely eroded, which limits the application. From the perspective of increasing the response speed, improving current-limiting efficiency, and reducing erosion, this article designs three LMCLs with polymethyl methacrylate (PMMA) material, ZnO pulse power resistance (ZnO PPR) material, and Kovar 4J29 material as the wall. Specifically, the wall is an important part of LMCL cavity with a channel. In addition, there is a discussion about the reasons for the different arc plasma intensity between the insulating wall LMCL and the resistive wall LMCL, from the point of current distribution. Furthermore, for Kovar 4J29 wall LMCL, the development process of the arc plasma is analyzed, and the effectiveness of the resistive wall LMCL is proven. Finally, the five current-limiting parameters of the three LMCLs under different short-circuit currents are compared and discussed. This article opens up a new approach for parameter optimization research and diversified development of LMCL.