Using ADCMP553 for signal recovery

Hi all,

I am trying to recover a signal from a photodiode (1 to 100Mhz)

Because the signal is very noisy, voltage range vary and my amplifier output is differential, I decided to use ADCMP553 comparator.

My problem is that comparator outputs just follow the inputs.

I expected a logic PECL output.

Schematic and scope capture include.

Thanks for your help.