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Noiseless optical components are critical for applications ranging frommetrology to quantum communication. Here we characterize several commercialtelecom C-band fiber components for parasitic noise using a tunable laser. Weobserve the spectral signature of trace concentrations of erbium in all devicesfrom the underlying optical crystals including YVO4, LiNbO3, TeO2 and AMTIRglass. Due to the long erbium lifetime, these signals are challenging tomitigate at the single photon level in the telecom range, and suggests the needfor higher purity optical crystals.

Parasitic erbium photoluminescence in commercial telecom fiber optical components