Abstract: A point cloud encoding and decoding method including: obtaining encoding limit information that comprises a group quantity limit threshold; obtaining a transform coefficient sequence of point cloud points based on the encoding limit information, where the point cloud points are comprised in a point cloud group that has a quantity less than or equal to the group quantity limit threshold, and where the transform coefficient sequence is obtained by sorting transform coefficients of the point cloud points; and encoding the transform coefficient sequence to obtain a point cloud group bitstream that corresponds to the point cloud group.

Abstract: A polarization recovery device comprises an input that receives a first optical signal with unknown polarization and with at least one signal parameter at an initial value, a first output that outputs a second optical signal with known polarization and with the at least one signal parameter at or near the initial value, and a recovery block that generates the second optical signal based on the first optical signal.

Abstract: A polarization recovery device comprises an input that receives a first optical signal with unknown polarization and with at least one signal parameter at an initial value, a first output that outputs a second optical signal with known polarization and with the at least one signal parameter at or near the initial value, and a recovery block that generates the second optical signal based on the first optical signal.