  We investigate ideal and non-ideal continuous-variable quantum teleportation
protocols realized by using an entangled displaced Fock state resource. The
characteristic function formulation is applied to measure the relative
performance of displaced Fock state for teleporting squeezed and coherent
states. It is found that for such single-mode input fields, the average
fidelity remains at the classical threshold, suggesting that the displaced Fock
states are not advantageous for teleportation. We also discuss the major
decoherence effects, caused by the inaccuracy in Bell measurements and photon
losses for the propagation of optical fields via fibre channels. The changes in
the teleportation fidelity are described by adjusting the gain factor ($g$),
reflectivity ($R$), mode damping ($\tau$), and the number of thermal photons
($n_\mathrm{th}$). The possibility of successful teleportation can be optimized
by fixing these realistic parameters.
