The invention discloses a
wavelength division
multiplexing type
silicon substrate optical receiving
chip insensitive to polarization. The optical receiving
chip comprises a speckle convertor, a
polarization beam splitter, two optical splitters and a plurality of photoelectric detectors. An optical
signal in an
optical fiber is coupled into the
silicon substrate optical receiving
chip by the speckle convertor, the optical
signal is separated into TM model polarized light and TE model polarized light orthogonal with the TM model polarized light by the
polarization beam splitter in a polarization mode, a TM model polarized
light signal is converted into the TM model polarized light by a
polarization rotator, the parts, with the same
wavelength, in the optical
signal in a first
silicon waveguide and a second silicon
waveguide are downloaded correspondingly through the first optical splitter and the second optical splitter respectively, and the two ends of each photoelectric
detector correspond to one output end of the first optical splitter and one output end of the second optical splitter respectively. All the components on the silicon substrate optical receiving chip are small in size and low in optical
insertion loss, and
time domain synchronization and
optical power balance are easy to achieve.
Spectral response of all the components on the silicon substrate optical receiving chip is flat, the
wavelength correlation loss is small, and the
wavelength division multiplexing optical receiving function insensitive to polarization is achieved.