AD9517-4 phase noise

Hello!

We are using AD9517-4 for reference frequency set generation: 400MHz, 200MHz and 100MHz. We used GXO-E72 100MHz PECL crystal oscillator as reference.Our problem is - there is too much noise at offsets between 100Hz and 100kHz.

Reference (100MHz) phase noise:

100MHz PECL output:

ADIsimCLK simulation results:

What may be a reason of this ?

Thanks in advance.