Multi-planar optical converter, phase file determination method thereof and related device

The invention discloses an MPLC and a phase file determination method thereof, and a related device, and belongs to the technical field of optical communication. The MPLC comprises N phase transformation areas, the N phase transformation areas are used for sequentially carrying out phase modulation on an input light beam to obtain an output light beam, and N is an integer and is greater than 1; the input light beam comprises X light beams in different order modes, and the output light beam comprises a light beam in a multiplexing mode; or, the input light beam comprises a light beam in a multiplexing mode, and the output light beam comprises X light beams in different order modes; wherein the light beams in the multiplexing mode comprise X light beams in different order modes, the X light beams in different order modes comprise a light beam in a first order mode and a light beam in a second order mode, and the mode field diameters of the light beam in the first order mode and the light beam in the second orde