Germanium Ge photodiode detector 800-1800nm measurement pulse and continuous fiber light source

Xiaoxiao Photon's germanium photodiodes convert optical power into current, making them an ideal choice for measuring pulse and continuous fiber light sources. The detector is a ceramic with an anode and a cathode. The anode of a photodiode generates a current, which is a function of the incident light power and wavelength. The responsivity R (λ) can be read from the graph on the next page to estimate the amount of photocurrent. By connecting the load resistor (RL) from the anode of the photodiode to circuit ground, current can be converted into voltage. Where P is power, the output voltage is represented by the following equation: bandwidth fBW and rise time response tR are determined by diode capacitance CJ and load resistance RL, as shown below. By applying a bias voltage between the cathode of the photodiode and the circuit ground, the diode capacitance can be reduced.