Generation of two-photon light with given spectral and temporal properties is of great interest for quantum
communication and quantum metrology applications. In particular, preparation of biphotons with ultra-narrow
correlation time is a very important task. In a recent series of papers, our group analyzed the generation of twophoton
wavepackets, produced by Spontaneous Parametric Down Conversion, in crystals with linearly chirped
quasi-phase matching grating. Wavepackets present very broad spectra but a broad spectrum does not necessarily
imply small correlation times, although the inverse is true. Indeed, the spectrum broadening induced by the
grating is inhomogeneous; for this reason, the two-photon spectral amplitude present a phase (a frequency chirp)
that depend nonlinearly on the frequency. Hence, the two-photon wavepackets are not Fourier transform-limited.
As suggested in, the ideal way to make the wavepacket perfectly transform limited is to insert in the path of
the biphotons a proper optical medium that compensates the non-linear part of the phase factor present in the
spectral amplitude. In our work, we investigate the non-local temporal compression of the photons induced
by the insertion of a standard optical fibre in the path of one of the two photons. We present and discuss a
systematic study of this phenomenon and some optimal situation where the full numerical calculation shows an
effect that can be clearly observed with a realistic set-up. The study has open the way to the practical realization
of this idea.