3results about How to "Increase modulation depth" patented technology

This invention discloses a neuron-like optical switch based on a metal quantum well, comprising a substrate, and a dual-ring resonator and a metal quantum well located on the substrate. The dual-ring resonator includes a first straight waveguide, a first ring waveguide, a second straight waveguide, and a second ring waveguide. The first straight waveguide includes a first input terminal, and the second straight waveguide includes a second input terminal and an output terminal. The first straight waveguide is coupled to the first ring waveguide, and the first ring waveguide is coupled to the second ring waveguide. The metal quantum well is located between the second ring waveguide and the second straight waveguide. Incident light enters the first straight waveguide from the first input terminal, and after coupling, enters the first and second ring waveguides. Pump light enters the second straight waveguide from the second input terminal to irradiate the metal quantum well. By changing the intensity of the pump light, the refractive index of the metal quantum well is modulated, thereby modulating the intensity of the light output from the output terminal. This optical switch exhibits high optical modulation speed and modulation efficiency.

The application discloses a K-band transit-time oscillator based on a last pre-cavity extraction structure, which comprises an inner cylinder and an anode outer cylinder sleeved outside the inner cylinder, a circular annular cavity is formed between the inner cylinder and the anode outer cylinder, the cavity comprises a first drift tube, a first modulation cavity, a second drift tube, a second modulation cavity, a third drift tube, an extraction cavity and a first coaxial output waveguide which are sequentially communicated, the output end of the anode outer cylinder is further provided with a circular annular second coaxial output waveguide, the first coaxial output waveguide and the second coaxial output waveguide are coaxially arranged, the second modulation cavity is further communicated with the second coaxial output waveguide, and the K-band transit-time oscillator is rotationally symmetrical about the central axis of the inner cylinder. The application verifies the feasibility of extracting microwave by the last pre-cavity, and realizes higher efficient output and higher power output.

The application discloses a single-transformer self-powered isolation gate drive circuit and a control method thereof, comprising a transmitting end and a receiving end; the transmitting end comprises an edge detection module and an edge-triggered frequency shift keying module for detecting rising and falling edges of an input drive signal; the edge-triggered frequency shift keying module is connected with a clock signal generation module and the edge detection module; in response to the edge detection module detecting the rising edge of the input drive signal, a first clock signal is output; in response to the edge detection module detecting the falling edge of the input drive signal, a second clock signal is output; the primary side of an isolation transformer is connected with the edge-triggered frequency shift keying module for outputting a high-frequency alternating power signal; and the receiving end is used for converting the high-frequency alternating power signal into a gate drive signal. In this way, modulation is only performed on extremely short signal edges, the transformer can dedicate most of the duty cycle to energy transmission, high modulation depth is achieved, and interference between the power supply and data transmission is improved.