Optical transmission system and method for core scrambling for multicore optical fibers

An optical transmission system comprising an optical transmitter configured to transmit data over an optical fiber transmission channel made of a multi-core fiber, optical signals carrying said data propagate along the multi-core fiber according to two or more cores, each core being associated with one or more core parameters, wherein the optical transmission system comprises:

• a scrambling configuration device configured to determine a scrambling function depending on one or more of the core parameters associated with said two or more cores, and
• at least one scrambling device arranged in said optical fiber transmission channel for scrambling said two or more cores, each of said at least one scrambling device being configured to determine permuted cores by applying said scrambling function to said two or more cores and to redistribute said optical signals according to said permuted cores, wherein a core parameter associated with each core is chosen in a group comprising a core type and a core loss value.