What is a balanced photodetector?
Introduction
The balanced photodetector consists of two photodiodes and a differential amplifier. The optical signal is first split into two paths through an optical beam splitter and is fed into the two photodiodes. The two photodiodes operate in the same way, but the input light signal is in opposite phase. The differential signal is amplified by the amplifier and the working points of the two photodiodes are adjusted by the feedback loop so that their output signals are always equal, thus eliminating the unevenness and variability in light source intensity and photodiode performance, etc., and improving the sensitivity and anti-interference capability of the detector.
Balanced photodetector applications
- Atmospheric Remote Sensing Lidar
- Wind measurement lidar：Coherent detection type wind measurement lidar with 1550nm NIR laser and balanced photodetector for coherent detection
- Distributed Fiber Optic Vibration Sensing System：Using coherent detection detection scheme
- OCT：Using balanced photodetector
Balanced Photodetector Products
Balanced Photodetector Price
The price of balanced photodetector is in the range of $1000~$3000 in the market.