Dear Martin,
RF modulated signal, even counted it in baud rate, most of them are linear signals in each baud to keep the AM, FM, and PM details. In this way, a laser diode driver for this type of applications should be a linear driver.
ADN2525 is a quantizer, current sink device to work with directly modulated lasers: DMLs.
It only drive the laser IBIAS linearly, but drive the high speed IMOD current in limiting mode.
Because of this, it may not be a right laser diode driver device to support RF modulated signal.
Hope this is useful to your device selection.
Best Regards,
Dongfeng Zhao