Can someone tell me the components inside an Optical Time Domain Reflectometer (OTDR)?

21 June 2013 1 883 Report

I'm a little bit confused in the Amplifier components.

I read that the amplifier is a Current to Voltage Converter. But it is a inverting amplifier (as I read at Wikipedia) so it will make the current from APD into a negative voltage. Does it used a buffer to make the voltage back to positive so that it can be used at ADC?

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