5 results about "Opto-electronic oscillator" patented technology

The application relates to a method of an electric field sensor based on an optoelectronic oscillator, belonging to the field of optical devices and optical fiber sensing. The device comprises a laser source, a polarization controller, a phase modulator, a fiber Bragg grating with an acrylate glue cavity, a stacked piezoelectric ceramic, an electric field generator, an erbium-doped fiber amplifier, a photodetector, a power divider and an electric amplifier. The stacked piezoelectric ceramic is combined with the fiber Bragg grating with the acrylate glue cavity as a sensing head, the wavelength change of the fiber Bragg grating with the acrylate glue cavity caused by the piezoelectric effect is mapped to the frequency change of the microwave signal generated by the optoelectronic oscillator, and the electric field change value can be obtained by monitoring the microwave signal of the optoelectronic oscillator. In the loop of the optoelectronic oscillator, the electric spectrum analysis technology is used for demodulation, and high-speed and high-resolution electric field measurement can be obtained. The method has the advantages of simple structure, high measurement sensitivity and easy practicability.

This invention provides a sensitivity-enhanced temperature measurement device based on an optoelectronic oscillator, comprising: a laser, an intensity modulator, a delay line interferometer, a sensitive arm fiber optic unit located in the space where the signal to be measured is located, a reference arm fiber optic unit, a photodetector, a microwave amplifier, a bandpass filter, a power divider, and a frequency measurement section. The intensity modulator generates an optical signal containing two frequency components: a carrier wave f0 and a first-order single-sideband wave f1. The delay line interferometer then separates these two frequency components, allowing them to propagate separately along the reference arm and sensitive arm fibers. These components are then returned to the delay line interferometer and combined to output an optical signal whose phase contains the temperature signal to be measured. The phase change of the optical signal caused by the temperature signal to be measured is then converted into a frequency change in the microwave signal output by the optoelectronic oscillator. This invention also provides a sensitivity-enhanced temperature measurement method. The device provided by this invention can effectively improve the sensitivity of temperature detection.

The application discloses a tunable optoelectronic oscillator based on a DML-SOA laser chip and belongs to the technical field of semiconductor processes. The tunable optoelectronic oscillator comprises a self-feedback laser, the self-feedback laser encapsulates a DML-SOA laser and an optical isolator in a butterfly tube shell, and is sequentially connected with an optical time delay line and an optoelectronic detector through an optical path, the optoelectronic detector is connected with an electrical amplifier through an electric circuit, the electrical amplifier is connected with an electrical coupler through an electric circuit, one of the electrical coupler is connected with a Bias-T through an electric circuit, the other of the electrical coupler is used as a microwave signal output, and a direct-current power supply is connected with the Bias-T and the self-feedback laser simultaneously. The tunable optoelectronic oscillator has the characteristics of compact structure, high signal-to-noise ratio and low phase noise, can realize a P-1 oscillation phenomenon with adjustable frequency interval through simple electrical injection tuning, and has a wide application prospect in the field of optoelectronic integration and microwave signal generation.

This invention belongs to the field of optoelectronic technology, specifically relating to a novel synthetic dimension optoelectronic oscillator device and its implementation method for generating arbitrary chirped signals. This invention utilizes a high-speed phase modulation unit based on lithium niobate technology as the core component. By adjusting the delay difference between the phase drive signal period and the optoelectronic oscillator, it achieves a deep fusion of optical dimension synthesis and electronic feedback oscillation, enabling the generation of microwave signals with arbitrarily adjustable instantaneous frequencies. Furthermore, by controlling the time mismatch and drive signal voltage, the bandwidth and repetition rate of the output signal can be flexibly tuned. This invention combines the advantages of photonic bandwidth and flexibility with the stability and precision of electronics, enabling the generation of broadband, highly stable complex waveforms, and is expected to meet the application requirements of next-generation intelligent sensing systems for high-resolution detection and flexible waveform generation.

This invention discloses a microwave-optical wave cooperative detection system based on a Fourier domain mode-locked optoelectronic oscillator, belonging to the field of microwave photonics technology. The system includes: a linear frequency modulated (LFM) signal generation module based on a Fourier domain mode-locked optoelectronic oscillator, a microwave photonic radar transceiver module, and a lidar transceiver module. The LFM optical signal used by the lidar is directly generated by the LFM signal generation module based on the Fourier domain mode-locked optoelectronic oscillator, while the LFM microwave signal used by the microwave photonic radar is generated by converting the optical signal generated by the module into a 20GHz high-speed photodetector. By replacing the discrete notch filter with a microdisk optical filter in microwave photonics technology, a large-bandwidth LFM signal is generated for simultaneous use by both lidar and microwave radar, achieving system miniaturization. Furthermore, the system can be adjusted to different processing modes to cope with different environments, fully leveraging the advantages of microwave-optical wave cooperative detection and using a radar detection system more suitable for the current environment.