Symmetrical photodetectors are required to measure differential optical signals in fiber-optic sensor systems and systems for optical coherence tomography (OCT).
Symmetrical InGaAs photodetectors, also referred to as balanced detectors, are used in fiber-optic applications in optical coherence tomography and fiber sensor technology. Mach Zehnder interferometers are also available with integrated symmetrical detectors.
Different models are available as balanced detectors: