  In the present paper we present ways to modulate the periodic transmission
peaks arising in disordered one dimensional photonic structures with hundreds
of layers. Disordered structures in which the optical length nd (n is the
refractive index and d the layer thickness) is the same for each layer show
regular peaks in their transmission spectra. A proper variation of the optical
length of the layers leads to a splitting of the transmission peaks. Notably,
the variation of the occurrence of high and low refractive index layers, gives
a tool to tune also the width of the peaks. These results are of highest
interest for optical application, such as light filtering, where the manifold
of parameters allows a precise design of the spectral transmission ranges.
