Abstract: A lock, a vehicle parking system, and a vehicle parking method are provided. The lock includes a main body, a lock switch, a lock controller, a lock communication circuit, and a battery. The battery is connected to the lock switch, the lock controller, and the lock communication circuit, and configured to supply electrical energy to the lock switch, the lock controller, and the lock communication circuit. The lock communication circuit is connected to the lock controller, and transmits a locking instruction or an unlocking instruction to the lock controller when receiving the locking instruction or the unlocking instruction from a second device located outside the lock. The lock controller is connected to the lock switch connected to the main body, and the lock controller controls, when receiving the locking instruction or the unlocking instruction, the main body to perform a locking operation or an unlocking operation through the lock switch.

Abstract: A negative active material includes a carbon material. The carbon material satisfies the following relationship: 6<Gr/K<16, Gr is a graphitization degree of the carbon material, measured by X-ray diffraction; and K is a ratio Id/Ig of a peak intensity Id of the carbon material at a wavenumber of 1250 cm?1 to 1650 cm?1 to a peak intensity Ig of the carbon material at a wavenumber of 1500 cm?1 to 1650 cm?1, and is measured by using Raman spectroscopy, and K is 0.06 to 0.15.

Abstract: A negative active material includes a carbon material. The carbon material satisfies the following relationship: 6<Gr/K<16, Gr is a graphitization degree of the carbon material, measured by means of X-ray diffraction; and K is a ratio Id/Ig of a peak intensity Id of the carbon material at a wavenumber of 1250 cm?1 to 1650 cm?1 to a peak intensity Ig of the carbon material at a wavenumber of 1500 cm?1 to 1650 cm?1, and is measured by using Raman spectroscopy, and K is 0.06 to 0.15. The negative active material according to this application can significantly improve an energy density, cycle performance, and rate performance of the electrochemical device.

Abstract: A wavelength selective switch includes an attenuation liquid crystal cell array and a switching liquid crystal cell array, the attenuation liquid crystal cell array is configured to select a region where a light is incident on the switching liquid crystal cell array; the switching liquid crystal cell array includes a first ECB liquid crystal cell array, which is divided into a plurality of pixel units, a phase of each pixel unit is adjusted by setting different voltages so that a phase pattern formed by the pixel units exhibits a lens property, and the light passing through the switching liquid crystal cell array is deflected by changing a center of the lens formed by the phase pattern, so as to select an outgoing port.

Abstract: The present disclosure relates to wavelength selective switches. In one embodiment, a wavelength selective switch may include a liquid crystal (LC)-based attenuation switching device that has an LC switching module to switch an incident beam to one of a plurality of output paths. The LC switching module may include one or more LC switching cells. The LC-based attenuation switching device further includes a mirror to reflect the beam from the LC switching module so as to output the beam through a corresponding output port, and a temperature compensation module provided on a side of the mirror opposite to the LC switching module. The temperature compensation module may be configured to alter curvature of the mirror as temperature changes so as to compensate for deformation of the LC switching cells due to the temperature change.

Abstract: A wavelength selective switch includes an attenuation liquid crystal cell array and a switching liquid crystal cell array, the attenuation liquid crystal cell array is configured to select a region where a light is incident on the switching liquid crystal cell array; the switching liquid crystal cell array includes a first ECB liquid crystal cell array, which is divided into a plurality of pixel units, a phase of each pixel unit is adjusted by setting different voltages so that a phase pattern formed by the pixel units exhibits a lens property, and the light passing through the switching liquid crystal cell array is deflected by changing a center of the lens formed by the phase pattern, so as to select an outgoing port.

Abstract: The present disclosure relates to wavelength selective switches. In one embodiment, a wavelength selective switch may include a liquid crystal (LC)-based attenuation switching device that has an LC switching module to switch an incident beam to one of a plurality of output paths. The LC switching module may include one or more LC switching cells. The LC-based attenuation switching device further includes a mirror to reflect the beam from the LC switching module so as to output the beam through a corresponding output port, and a temperature compensation module provided on a side of the mirror opposite to the LC switching module. The temperature compensation module may be configured to alter curvature of the mirror as temperature changes so as to compensate for deformation of the LC switching cells due to the temperature change.

Abstract: A method for compensating for a wavelength shift in a wavelength selective switch (WSS), and a device therefor. The device comprises a fixed seat (301) as well as a rotation beam (304) and a compensation block (302) that have different thermal expansion amounts, the rotation beam (304) and the compensation block (302) being fixedly adhered to the fixed seat (301). In the method, a combined structure of the rotation beam (304) and the compensation block (302) with different thermal expansion amounts is adopted; the combined structure rotates by means of different expansion amounts generated by the rotation beam (304) and the compensation block (302) at the same external temperature, and further drives an optical element of the WSS to rotate, hence compensating for a wavelength shift of the WSS. The method is safe and reliable; the device has a simple structure, and is convenient to encapsulate, is applicable to various WSS optical paths, and does not affect advantages of the optical path structure of the WSS.

Abstract: A method for compensating for a wavelength shift in a wavelength selective switch (WSS), and a device therefor. The device comprises a fixed seat (301) as well as a rotation beam (304) and a compensation block (302) that have different thermal expansion amounts, the rotation beam (304) and the compensation block (302) being fixedly adhered to the fixed seat (301). In the method, a combined structure of the rotation beam (304) and the compensation block (302) with different thermal expansion amounts is adopted; the combined structure rotates by means of different expansion amounts generated by the rotation beam (304) and the compensation block (302) at the same external temperature, and further drives an optical element of the WSS to rotate, hence compensating for a wavelength shift of the WSS. The method is safe and reliable; the device has a simple structure, and is convenient to encapsulate, is applicable to various WSS optical paths, and does not affect advantages of the optical path structure of the WSS.