The output of the O/E Converter Optical Oscilloscope Probe: TIA-4000 is brought out to a type K female SMA connector. Light falling on the detector generates a positive-going proportional current. This current, multiplied by the transimpedance produces a voltage that is proportional to the light incident on the detector surface.
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Datasheet: Optical To Electrical Converters TIA-4000
In Depth TIA Series Comparison Chart