Patent ID: 7941058
Filing Date: 2011-05-10
Classification: H04B,H04L

Abstract:
1. Device for decoding an optical multi-level DPSK signal, the device comprising: means for receiving the multi-level DPSK signal; at least two means for transforming optical multi-level DPSK signals into corresponding analog electrical signals; means for splitting up the received multilevel DPSK signal into at least two optical multilevel DPSK signals, one for each of the opto-electrical transforming means; means for processing electrical signals; and at least two means for transforming the analog electrical signals into corresponding electrical logical binary signals, each of the at least two means for transforming the optical signals include an optical delay and an add filter comprising an upper and lower path; characterized in that the analog-to-logical-binary transformation means comprises four sampling and binary threshold decision devices, disposed before the processing means and that the processing means process electrical logical binary signals and an upper signal passing on the upper path of each of the at least two means is delayed by an identical time T and the lower signal passing along the lower path is phase shifted by an angle Ψ.