An optical probing instrument is for coupling light through an optical signal on an edge of an integrated photonic component. The optical probing instrument includes a probe card, a plurality of probe heads and a plurality of polarization selectors. The probe heads are disposed on a side of the probe card. Each of the probe heads includes a polarization discriminator and two waveguides. The waveguides are connected to the polarization discriminator and disposed through the probe card, wherein one waveguide of each of the probe heads can transmit an S-polarized light, and the other waveguide transmits a P-polarized light. The polarization selectors are disposed on the probe card and each of the polarization selectors is respectively connected to the waveguide of each of the probe heads, wherein each of the polarization selectors controls a polarization of the optical signal. Therefore, the optical probing instrument can be used to couple light through the edge of the integrated photonic component, and it has higher coupling efficiency and can analyze a polarization dependency commonly found in integrated photonic components. |