An optical full field detector for an incoming optical signal, said incoming optical signal having a central frequency f 0 and a bandwidth B and comprising n polarization states, n being an integer comprised between [0; 2], when n=1 the incoming optical signal has one polarization state along a first or a second direction (H or V), when n=2 the incoming optical signal has two polarization states, one along the first direction and the other along the second direction, the first and second directions (H and V) being orthogonal, otherwise n=0; the optical full field detector being adapted to simultaneously detect the phase and amplitude of the polarization states of the incoming optical signal, the optical full field detector comprising: - a polarization beam splitter adapted to receive and split the incoming optical signal in two polarized signals by separating the polarization states along the first and second directions (H and V); - a first laser polarized along the first direction and having a predetermined frequency f 1; - a second laser polarized along the second direction and having a predetermined frequency f 2; - a first and a second polarization maintaining coupler (PMC1 and PMC2); - a polarization beam combiner; - one opto-electronic converter; - one analog-to-digital converter; and - a digital signal processor, wherein - the first polarization maintaining coupler is adapted to couple the polarized signal along the first direction of the incoming optical signal with the first laser and maintain the polarization along the first direction of this first obtained signal, and the second polarization maintaining coupler is adapted to couple the polarized signal along the second direction of the incoming optical signal with the second laser and maintain the polarization along the second direction of this second obtained signal; - the polarization beam combiner is adapted to combine the first and second obtained signals into a coupled optical signal; - the opto-electronic converter is adapted to receive and convert the coupled optical signal into an electrical signal; - the analog-to-digital converter is adapted to receive and convert the electrical signal into a digital signal; and - the digital signal processor is adapted to receive the digital signal and to extract from the digital signal the phase and amplitude of the n polarization states of the incoming optical signal. - a polarization beam splitter adapted to receive and split the incoming optical signal in two polarized signals by separating the polarization states along the first and second directions (H and V); - a first laser polarized along the first direction and having a predetermined frequency f 1; - a second laser polarized along the second direction and having a predetermined frequency f 2; - a first and a second polarization maintaining coupler (PMC1 and PMC2); - a polarization beam combiner; - one opto-electronic converter; - one analog-to-digital converter; and - a digital signal processor, - the first polarization maintaining coupler is adapted to couple the polarized signal along the first direction of the incoming optical signal with the first laser and maintain the polarization along the first direction of this first obtained signal, and the second polarization maintaining coupler is adapted to couple the polarized signal along the second direction of the incoming optical signal with the second laser and maintain the polarization along the second direction of this second obtained signal; - the polarization beam combiner is adapted to combine the first and second obtained signals into a coupled optical signal; - the opto-electronic converter is adapted to receive and convert the coupled optical signal into an electrical signal; - the analog-to-digital converter is adapted to receive and convert the electrical signal into a digital signal; and - the digital signal processor is adapted to receive the digital signal and to extract from the digital signal the phase and amplitude of the n polarization states of the incoming optical signal.