Graded-index polymer waveguide and manufacturing method thereof

A manufacturing method of a graded-index polymer waveguide, comprising:

• providing a waveguide substrate;
• manufacturing a waveguide lower cladding layer on a surface of the waveguide substrate;
• coating a material of a waveguide core layer having UV photosensitivity on a surface of the waveguide lower cladding layer away from the waveguide substrate;
• performing a hot imprinting process for the material of the waveguide core layer by means of a flexible transfer film mold and forming the waveguide core layer having an imprinted waveguide link structure;
• performing a heat treatment process for the waveguide core layer having the imprinted waveguide link structure, wherein morphology of a top surface of the waveguide core layer turns to a circular structure;
• performing a pre-exposure process for the waveguide core layer after being performed the heat treatment process;
• coating a waveguide upper cladding layer on a surface of the waveguide core layer after being performed the pre-exposure process;
• and
• curing the waveguide core layer and the waveguide upper cladding layer.