An apparatus for demultiplexing optical signals at a large number of wavelengths
using at least one wavelength-selective filter includes at least two wavelength-selective
filters in each case for separation of signal components at one wavelength or at
two or more wavelengths, located one behind the other in an oblique configuration
in the beam path of the apparatus, and disposed such that the signal component
that is transmitted by a first filter falls on the subsequent, second filter, the
signal component that is reflected by the second filter not being reflected back
to the first filter but, instead, running past the first filter, and the signal
components that are reflected by the filters are joined together.
