公开(公告)号：US10164739B2

公开(公告)日：2018-12-25

申请号：US15626327

申请日：2017-06-19

Applicant: INSTITUT MINES-TELECOM

Inventor： Ghaya Rekaya Ben-Othman ,  Yves Jaouen ,  El-Mehdi Amhoud

IPC: H04L1/00 ,  H04B10/2581 ,  H04B10/516 ,  H04J14/04 ,  H04L5/00

Abstract: Embodiments of the invention provide an optical transmitter configured to transmit a data sequence over at least two spatial propagation modes through an optical transmission channel in a multi-mode optical fiber transmission system, the transmission system being associated with a predefined value of a mode-dependent loss, wherein the optical transmitter comprises: a forward error correcting code encoder (22) configured to encode said data sequence into a codeword vector by applying at least one error correcting code; a modulator (23) configured to determine a set of modulated symbols by applying a modulation scheme to said codeword vector; and a Space-Time encoder (24) configured to determine a codeword matrix by applying a Space-Time code to said set of modulated symbols.

公开(公告)号：US10425162B2

公开(公告)日：2019-09-24

申请号：US15651273

申请日：2017-07-17

Applicant: INSTITUT MINES-TELECOM

Inventor： Ghaya Rekaya Ben-Othman ,  Yves Jaouen ,  El-Mehdi Amhoud

IPC: H04B10/2581 ,  H04B10/50 ,  H04B10/60 ,  H04L1/00 ,  H04J14/02 ,  H04J14/04 ,  G02B6/14 ,  H04B10/61

Abstract: Embodiments of the invention provides a deterministic scrambler (1) arranged in a multimode optical fiber (130) for scrambling light, the light comprising a set of optical signals propagated in said multimode optical fiber according to a set of propagation modes, each propagation mode being associated with a power value, wherein the scrambler is configured to determine a permutation of said propagation modes depending on the power values associated with said propagation modes, the scrambler being configured to redistribute the optical signals according to said permutation of the propagation modes.

公开(公告)号：US10218442B2

公开(公告)日：2019-02-26

申请号：US15593402

申请日：2017-05-12

Applicant: INSTITUT MINES-TELECOM

Inventor： El-Mehdi Amhoud ,  Ghaya Rekaya Ben-Othman ,  Yves Jaouen

IPC: H04B10/00 ,  H04B10/2581 ,  H04B7/0456 ,  H04L5/00 ,  H04L1/06

Abstract: Embodiments of the invention provide a Space-Time coding device for encoding a digital data sequence according to a predefined space-time coding rate, said data sequence comprising a set of modulated symbols to be transmitted over at least two propagation modes, during a number of time slots, through an optical transmission channel in a single-core multimode optical fiber transmission system, wherein the device comprises: a codebook generator (53) configured to determine a set of codeword matrices defining a space-time code represented by a space dimension and a temporal dimension, each codeword matrix comprising complex values and a number of columns equal to said code temporal dimension, and a number of rows equal to said code space dimension, the codebook generator (53) being further configured to associate a difference codeword matrix and a distance metric to each pair of codeword matrices among said set of codeword matrices, each component of a difference codeword matrix associated with a given pair of codeword matrices being equal to the difference between the corresponding components of the codeword matrices of said pair, the distance metric associated with a given pair of codeword matrices being determined by computing the Euclidean norm of the difference codeword matrix associated with said pair, wherein the codebook generator (53) is configured to select the components of the codeword matrices depending on the number of pairs of codeword matrices that are associated with a unitary difference codeword matrix and with a distance metric equal to a given Euclidean distance; and an encoding unit (55) configured to encode said set of modulated symbols into a codeword matrix selected from said set of codeword matrices.