LOG amp for OTDR

Dear Sir,

I want to make a simple OTDR (Optical Time Domain Reflectometer).

But because of optical connetor's reflection, there is not easy to get signal using

APD+transimpedance amp + A/D converter.

And so I want to use log amp instead of transimpedance amp.

Is it possible or not ?

Please suggest similar circuit or Log amp.

Thank you,