Hirundo's Tap-PD is the main component of the PD Device Tap (spectrum) and PD (photodiode). The function of the tap section is to separate part of the input light, and the common proportions are 1%, 5%, 10% and 50%;

The function of PD is to convert the PD signal irradiated by light into an electrical signal through the photoelectric effect, so that the analysis and processing of the optical signal can be realized.