In designing the whole circuit it is better to know the characteristic of the EOM.
I made impedance measurement with the EOM (New Focus model 4064) and I found it has capacitance of 10pF.
This is good agreement with the data sheet which says "5-10pF".
The measured plot is attached below. For comparison there also plotted "open" and "10pF mica".
In the interested band( from 1MHz to 100MHz), EOM looks just a capacitor.
But indeed it has lead inductance of 12nH, resistance of 0.74[Ohm], and parasitic capacitance of 5.5pF.
In some case we have to take account of those parasites in designing.