Optical receiving module, apparatus and method

The invention provides an optical receiving module which is applied to the field of optical communication. The optical receiving module comprises a beam shrinking module, a multi-core multi-mode waveguide and a detector. The beam shrinking module is used for receiving the first optical signal and shrinking the spot size of the first optical signal to obtain a second optical signal. The multi-core multi-mode waveguide includes a cladding and N waveguides. The multi-core multi-mode waveguide is used for receiving a second optical signal and concentrating the energy of the second optical signal in a plurality of waveguides of the N waveguides to obtain a plurality of third optical signals. The detector is an array composed of N sub-detectors. And the plurality of sub-detectors in the N sub-detectors are in one-to-one correspondence with the plurality of third optical signals. The plurality of sub-detectors are used for receiving the plurality of third optical signals and obtaining a plurality of electric signals