InGaAs High Speed Photodiode with Ball Lens

SKU: BPIN

This photodiode is ideal for measuring both pulsed and CW fiber light sources, by converting the optical power to an electrical current. The InGaAs Photodiode is a three pin device with a TO-46 package size. This specific photodiode has a ball shape lens, which is a great optical component for improving signal coupling between fibers. The photodiode anode produces a current, which is a function of the incident light power and the wavelength. The responsivity ℜ (λ) can be read from the plot on the following page to estimate the amount of photocurrent to expect. This can be converted to a voltage by placing a load resistor (R_L) from the photodiode anode to the circuit ground. The output voltage is derived as:The bandwidth, f_BW, and the rise time response, t_R, are determined from the diode capacitance, C_J, and the load resistance, R_L, as shown below. The diode capacitance can be lowered by placing a bias voltage from the photodiode cathode to the circuit ground.