7 results about "Polarization diversity" patented technology

A method according to one embodiment of the present disclosure for controlling an optical amplification device (10) of a polarization diversity configuration comprises: detecting a first optical intensity of first polarized waves from a first amplifier (102) which is disposed between a polarization splitter (121) and a polarization combiner (122); detecting a second optical intensity of second polarized waves from a second amplifier (103) which is disposed between the polarization splitter (121) and the polarization combiner (122); detecting a third optical intensity of the first polarized waves from the polarization combiner (122) in a state where the second polarized waves are not input to the polarization combiner (122); detecting a fourth optical intensity of the second polarized waves from the polarization combiner (122) in a state where the first polarized waves are not input to the polarization combiner (122); and acquiring loss of the first polarized waves from the first amplifier (102) to the polarization combiner (122) and loss of the second polarized waves from the second amplifier (103) to the polarization combiner (122) on the basis of the first optical intensity, the second optical intensity, the third optical intensity, and the fourth optical intensity.

This invention relates to a phase-sensitive optical time-domain reflectometer based on orthogonal frequency division multiplexing (OFDM) pulse coding. A continuous laser beam is split into a local path and a probe path via an optical coupler. The probe path, driven by a radio frequency signal, generates multiple frequency-orthogonal intensity-coded pulse sequences through an optical intensity modulator. These sequences are arranged sequentially in time, possessing the same symbol information but different chip sequences. The Rayleigh backscattered light generated by the pulse sequences entering the sensing fiber under test undergoes coherent interference with the local light in an optical bridge and polarization diversity module. The signal acquisition circuit utilizes an unmatched filter to achieve pulse compression and Rayleigh scattering signal separation, and synthesizes the results of the pulse coding sequences at each frequency to obtain the strain signal. Compared with existing technologies, this invention achieves pulse compression by designing an unmatched filter, improving the signal-to-noise ratio while maintaining spatial resolution. Furthermore, by synthesizing the results of orthogonal frequency pulse sequences, coherent fading is eliminated, achieving fading-free, high signal-to-noise ratio strain measurement.

A quadri-polarization diversity antenna system is disclosed.According to embodiments of the present disclosure, an antenna system includes an antenna array including columns of first dual-polarized antenna units arranged on a first plane of an antenna panel and columns of second dual-polarized antenna units arranged on a second plane of the antenna panel. The first plane and the second plane form an obtuse angle with each other. The columns of the first dual-polarized antenna units are used to form a first beam with + / −45 ° polarizations, and the columns of the second dual-polarized antenna units are used to form a second beam with 0° / 90° polarizations.

The application relates to a laser radar transceiver integrated chip, which comprises a gain chip, a thin-film lithium niobate photon chip and a 1 / 4 wave plate, the thin-film lithium niobate photon chip comprises a double-cavity narrow-line-width laser module, a first 1*2 coupling beam splitter, an optoelectronic feedback control assembly, a second 1*2 coupling beam splitter, a frequency mixer, a polarization rotation beam splitter and a first optoelectronic balance detector; the 1 / 4 wave plate is arranged on the light-emitting side of the polarization rotation beam splitter; the laser radar transceiver integrated chip can realize on-chip high-speed tunable narrow-line-width laser by integrating the gain chip and the thin-film lithium niobate photon chip; the optoelectronic feedback control assembly and an external circuit structure form an optoelectronic feedback control loop, which can inhibit the nonlinear disturbance generated in the laser frequency tuning process; by combining the polarization rotation beam splitter and the 1 / 4 wave plate, the functions of receiving the echo signal and polarization diversity can be realized, the quality of the coherent signal can be improved, and a longer detection distance can be achieved.

This invention provides a low-altitude communication anti-interference system and channel allocation method combining polarization diversity and frequency diversity, belonging to the field of low-altitude communication technology. The system consists of a multi-polarization antenna array, a broadband radio frequency front-end, a digital signal processing unit, an adaptive controller, and an environmental sensing module. The core of this invention is a polarization-frequency joint channel allocation method, which achieves global optimized allocation of channel resources by constructing a polarization-frequency two-dimensional channel quality matrix. The system adopts a multi-layer adaptive architecture, including a fast response layer and a deep optimization layer, balancing real-time performance and optimization level. Furthermore, this invention proposes a dynamic adjustment mechanism for diversity parameters to resist intelligent interference and an interference identification method based on polarization characteristics, significantly improving the system's communication reliability and anti-interference capability in complex electromagnetic environments. It can maintain extremely low bit error rate communication even in strong interference environments.

A quadri-polarization diversity antenna system is disclosed.According to embodiments of the present disclosure, an antenna system includes an antenna array including a first column of dual-polarized antenna units and a second column of dual-polarized antenna units. Each of the dual-polarized antenna units includes a first antenna element and a second antenna element perpendicularly crossing each other. In each column, the first antenna elements are conductively connected to form a first subarray and the second antenna elements are conductively connected to form a second subarray. The antenna system further includes an RF matrix that selectively adjusts phases of RF input signals to generate RF output signals provided to the subarrays. When the RF output signals are radiated by the dual-polarized antenna units, a first beam with + / −45° polarizations and a second beam with 0° / 90° polarizations are formed, and the first beam and the second beam are formed toward spatially different directions from each other.

The application relates to the field of silicon-based optoelectronic integration, and particularly discloses an on-chip adaptive combining method and a feedback system for polarization diversity MZM, which comprises the following steps: optical coupling and mode conversion, polarization diversity electro-optical modulation, optical power collection and photoelectric conversion, signal processing and feedback control, and a tunable combining module; after the coupling conversion and modulation, two-way optical power is collected and photoelectrically converted, a power difference voltage is obtained through an analog circuit, a control voltage is generated by superimposing a bias voltage, and a tunable combiner is driven to dynamically adjust a beam splitting ratio to complete combining. The application solves the problems that the output power of the polarization diversity MZM randomly fluctuates with the polarization state, the existing polarization control scheme has slow response, a complex structure and is difficult to integrate with a silicon-based process, realizes real-time and accurate compensation of power fluctuation, guarantees stable combining output power, and has a simple system structure, low power consumption, is easy to monolithically integrate with a silicon-based chip, and improves the performance and compatibility of an integrated photonic link.