The PWPR-2K series photoreceivers combine low-noise Si or InGaAs photodiodes with a specially designed transimpedance amplifier with extremely high toggle gain of 10⁹ V/A and 10¹⁰ V/A and ultra-low noise. This unique combination results in a photoreceiver with picowatt sensitivity due to its exceptional low NEP of <10 fW/√Hz.  Direct detection of optical powers down to ~100 fW is possible and when combined with an optional FEMTO lock-in amplifier.

Applications include; spectroscopy, reflection and transmission measurements, highly sensitive optoelectronic measurements, applications utilising optical chopper modulation, and optical front-end for oscilloscopes, A/D converters and lock-in amplifiers.