Modeling time and frequency fiber links with bidirectional amplifiers using transmission matrixes

In the paper we present a method intended to use for optimization of the signal-to-noise ratio in fiber optic links for time and RF frequency transfer exploiting bi-directional amplifiers. The method is based on transmission matrixes and its main intention is to take into account the asymmetry of the propagation conditions of backscattered signals that is lacking in previously published models. Such asymmetry may be intentionally introduced in the link by adding wavelength-selective isolators to have additional level of control on the propagation of backscattered signals.