  We discuss the data-pattern tomography for reconstruction of entangled states
of light. We show that for a moderate number of probe coherent states it is
possible to achieve high accuracy of representation not only for single-mode
states but also for two-mode entangled states. We analyze the stability of
these representations to the noise and demonstrate the conservation of the
purity and entanglement. Simulating the probe and signal measurements, we show
that systematic error inherent for representation of realistic signal response
with finite sets of responses from probe states still allows one to infer
reliably the signal states preserving entanglement.
