Germanium photodiodes are commonly used to measure optical power in the NIR range, especially in cost-sensitive applications or where a large-area detector is needed. However, germanium detectors have a lower shunt resistance and higher dark current than similarly-sized InGaAs detectors, resulting in higher noise levels overall. Therefore, germanium detectors are well suited for applications where the signal being detected is much higher than the noise floor. GPD Optoelectronics offers an “HS” series of germanium photodiodes which have higher-than-typical shunt resistance for improved performance.
Designed for high-speed applications with reverse bias > 10 V
Designed for applications with reverse bias < 5 V
Designed for zero bias applications
Designed for zero bias applications requiring high shunt resistance