Hi Sahil SIngh…
as already explained by aabid baba in the previous post that there are lot of filters present in the filter library itself both in optical as well as electrical domain including fabry parot , FBG can be used as filter, there are also bandpass. I would suggest you to choose one as per your requirement.As far Bessel filter is concerned it has flat group delay in the pass-band that is all the frequencies that are allowed to pass experience a constant delay and hence the fidelity of the signal at the output is maintained.
I hope that it will help you.