Fig. 1. Experimental setup.

Fig. 2. Experimental DOP as a function of pump power.

Fig. 3. (a) SOP and (b) eye diagram behind a polarizer of the 40  Gbit/s signal after polarization scrambling (1) without and (2) with the counterpropagating pump wave. (c) Evolution of the BER as a function of the received average power in BB configuration (dark squares)—at the output of the system with (open circles) and without (dark circles) the counterpropagating pump wave.

Fig. 4. (a) Evolution of the signal SOP at the omnipolarizer output for different values of the reflection coefficient R. (b) DOP of the output signal as a function of the average power of the reflected signal (and similarly as a function of R).

Fig. 5. Eye diagram behind a polarizer of the 40  Gbit/s signal after polarization scrambling (a1) without and (a2) with the reflected signal wave. (b) Evolution of the BER as a function of the received average power in the BB configuration (dark squares)—at the output of the system with (open circles) and without (dark circles) the reflected signal (RS) wave.

Fig. 6. Trajectories followed by the signal SOP to reach the final polarization state (SOP attractor), represented (a), (b) in the energy momentum representation and (c), (d) on the surface of the Poincaré sphere. As indicated in (a), (b), each regular point of the energy momentum diagram refers to a torus (see the text for details). In (a) and (c), the evolution of the input S(z=0)=[−0.30,0.60,0.74] (red) is shown for a transient time τtr of the same order as the time required to propagate throughout the omnipolarizer, τtr≈τL=2L/vg; the signal SOP exhibits an erratic polarization dynamics before reaching its attractor polarization state. In (b) and (d), the evolution of the three inputs S(z=0)=[−0.30,0.60,0.74] (red), S(0)=[−0.50,−0.50,0.70] (blue), and S(0)=[0.90,0.0,0.43] (green) is shown for τtr=103τL; the signal SOP adiabatically relaxes to its attractor polarization state. The arrows show the direction in which the trajectories travel.

Fig. 7. (a) Theoretical Poincaré representation obtained by numerically solving the spatiotemporal SOP evolution defined by Eq. (1). We considered a set of 64 different input signal SOPs, uniformly distributed over the Poincaré sphere. The blue dots represent output SOPs. The first row refers to a fiber length of L=5Λ0, and the second row to L=20Λ0. For the traditional two-source configuration [(a) and (c)], the signal is attracted toward a single SOP, which is determined by the injected pump SOP (green dot). For the omnipolarizer configuration [(b) and (d)], the input SOP ellipticity determines the two basins of attraction of the omnipolarizer, corresponding to the two hemispheres of the Poincaré sphere.