A system for visualizing an optical signal OS through ultra-fast linear optical sampling, comprising at least one first subsystem relating to the processing of a pulse sampling signal SP comprising a vertical polarization component Vsp and a horizontal polarization component Hsp and at least one second subsystem related to the processing of an optical signal OS to be sampled comprising a vertical polarization component Vtm, Vte and a horizontal polarization component Htm, Hte, the first and second subsystems adapted to cooperate with at least a device for sampling and detecting the optical signal, wherein the first subsystem comprises: - a source SPS for generating a pulse optical signal SP, - at least one duplicator SPD-PX-TS adapted to divide the pulse signal SP into two replicas, to introduces polarization crossing and a time-shift, equal to the sum (Tp/2 + Td) of half the period Tp of the pulse signal SP and bit-time Td of the optical signal OS, between the replicas, and to combined those two replicas into a single outgoing pulse signal SP, - at least one splitter PM-TSM-S (9, 10) adapted to divide the pulse signal SP leaving the duplicator SPD-PX-TS into two replicas, phase-shifted by one quadrature (π/2), for the vertical Vsp and horizontal Hsp polarization components of the pulse signal SP independently, - at least one device BD-ADC (13, 16) for sampling and detecting the optical signal, adapted to receive these two replicas, wherein the second subsystem comprises: - a separator PBS, adapted to received an optical signal OS to be viewed and to separate the incoming optical signal OS into two linear, orthogonal propagation modes E1 and E2, - at least one duplicator DD-PX-TS (23, 26) adapted to divide the optical signal OS output by the separator into two replicas, to introduces polarization crossing and a time-shift, equal to half the period Tp of the pulse signal SP, between the replicas, to combine those two replicas into a single outgoing pulse signal and to redivide this single signal into two replicas, the at least one device BD-ADC (13, 16) being further adapted to receive these two replicas. - a source SPS for generating a pulse optical signal SP, - at least one duplicator SPD-PX-TS adapted to divide the pulse signal SP into two replicas, to introduces polarization crossing and a time-shift, equal to the sum (Tp/2 + Td) of half the period Tp of the pulse signal SP and bit-time Td of the optical signal OS, between the replicas, and to combined those two replicas into a single outgoing pulse signal SP, - at least one splitter PM-TSM-S (9, 10) adapted to divide the pulse signal SP leaving the duplicator SPD-PX-TS into two replicas, phase-shifted by one quadrature (π/2), for the vertical Vsp and horizontal Hsp polarization components of the pulse signal SP independently, - at least one device BD-ADC (13, 16) for sampling and detecting the optical signal, adapted to receive these two replicas, wherein the second subsystem comprises: - a separator PBS, adapted to received an optical signal OS to be viewed and to separate the incoming optical signal OS into two linear, orthogonal propagation modes E1 and E2, - at least one duplicator DD-PX-TS (23, 26) adapted to divide the optical signal OS output by the separator into two replicas, to introduces polarization crossing and a time-shift, equal to half the period Tp of the pulse signal SP, between the replicas, to combine those two replicas into a single outgoing pulse signal and to redivide this single signal into two replicas, the at least one device BD-ADC (13, 16) being further adapted to receive these two replicas. - a separator PBS, adapted to received an optical signal OS to be viewed and to separate the incoming optical signal OS into two linear, orthogonal propagation modes E1 and E2, - at least one duplicator DD-PX-TS (23, 26) adapted to divide the optical signal OS output by the separator into two replicas, to introduces polarization crossing and a time-shift, equal to half the period Tp of the pulse signal SP, between the replicas, to combine those two replicas into a single outgoing pulse signal and to redivide this single signal into two replicas, the at least one device BD-ADC (13, 16) being further adapted to receive these two replicas.