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Silicon photodiode
In telecommunication, a silicon photodiode is a silicon-based PN- or PIN-junction photodiode.
Note 1: Such photodiodes are useful for direct detection of optical wavelengths shorter than approximately 1 μm.
Note 2: Because of their greater bandgap, silicon-based photodiodes are quieter than germanium-based photodiodes, but germanium photodiodes must be used for wavelengths longer than approximately 1 μm.
Source: from Federal Standard 1037C and from the FAA Glossary of Optical Communications Terms[?]
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