  We demonstrate wavelength-wavelength correlations of classical broad-band
amplified spontaneous emission (ASE) photons emitted by an erbium-doped fiber
amplifier (EDFA) in a wavelength regime around 1530nm. We then apply these
classical correlated photons in the framework of a real-world ghost
spectroscopy experiment at a wavelength of 1533nm to acetylene (C2H2)
reproducing the characteristic absorption features of the C-H stretch and
rotational bands. This proof-of-principle experiment confirms the
generalization of an ASE source concept offering an attractive light source for
classical ghost spectroscopy. It is expected that this will enable further
disseminating ghost modality schemes by exploiting classical correlated photons
towards applications in chemistry, physics and engineering.
