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：US11239917B2

公开(公告)日：2022-02-01

申请号：US17049308

申请日：2019-04-10

Applicant: INSTITUT MINES-TELECOM

Inventor： Ghaya Rekaya ,  Akram Abouseif ,  Yves Jaouen

IPC: H04B10/2525 ,  H04B10/2581 ,  H04B10/50 ,  H04B10/00 ,  H04B10/25 ,  H04B10/60

Abstract: The various embodiments provide an optical transmission system comprising an optical transmitter configured to transmit data over an optical fiber transmission channel comprising a multi-core fiber, the data being carried by optical signals, the optical signals propagating along the multi-core fiber according to two or more cores, the multi-core fiber being associated with fiber parameters and misalignment losses values, at least one scrambling device being arranged in the optical fiber transmission channel for scrambling the two or more cores according to a scrambling function, wherein the optical fiber transmission channel comprises a system configuration device configured to determine a core dependent loss value depending on the fiber parameters, at least one misalignment loss, a number of the at least one scrambling device, and the scrambling function.

公开(公告)号：US10122461B2

公开(公告)日：2018-11-06

申请号：US15508775

申请日：2015-09-04

Applicant: INSTITUT MINES-TELECOM

Inventor： Elie Awwad ,  Ghaya Rekaya-Ben Othman ,  Yves Jaouen

IPC: H04B10/2581 ,  H04B10/079 ,  H04B7/0413 ,  H04J14/04

Abstract: The invention relates to a mode selection method for a system for MIMO transmission on an optical fiber of multimode type. It comprises a step of measuring the transfer matrix of the transmission channel made up of a set of modes of the optical fiber (110), a step of transforming (120) the transfer matrix into a block diagonal matrix, each block being associated with a mode subset, a step of determining (130) the gain and/or the transmission capacity for each of the mode subsets, and a selection (140) of the mode subset corresponding to the highest gain and/or capacity, the MIMO transmission system then using only the modes of the subset thus selected to transmit on the optical fiber.The invention relates also to a core selection method for a system for MIMO transmission on optical fiber of multicore type.

公开(公告)号：US11539438B2

公开(公告)日：2022-12-27

申请号：US17049023

申请日：2019-04-10

Applicant: INSTITUT MINES-TELECOM

Inventor： Ghaya Rekaya ,  Akram Abouseif ,  Yves Jaouen

IPC: H04B10/2581 ,  G02B6/14 ,  H04B10/2507 ,  H04B10/516 ,  H04J14/04

Abstract: The various embodiments provide 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 the data propagate along the multi-core fiber according to two or more cores, the multi-core fiber being associated with fiber parameters and misalignment losses values, wherein the optical transmission system comprises a system administration device configured to determine a core dependent loss value depending on the fiber parameters and misalignment losses values.

公开(公告)号：US11218218B2

公开(公告)日：2022-01-04

申请号：US17050358

申请日：2019-04-10

Applicant: INSTITUT MINES-TELECOM

Inventor： Ghaya Rekaya ,  Akram Abouseif ,  Yves Jaouen

IPC: H04J14/04 ,  H04B10/2525 ,  H04B10/2581 ,  H04B10/50

Abstract: Embodiments provide an optical transmission system comprising an optical transmitter configured to transmit data over an optical fiber transmission channel comprising a multi-core fiber, the data being carried by one or more optical signals propagating along the multi-core fiber according to a plurality of cores, each core among the plurality of cores being associated with one or more core parameters, wherein the optical transmission system comprises a core selection device configured to select a set of transmit cores among the plurality of cores according to a transmit core selection criterion, the transmit core selection criterion being related to the one or more core parameters, the optical transmitter being configured to transmit the data over the set of transmit cores.

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.

公开(公告)号：US11641251B2

公开(公告)日：2023-05-02

申请号：US17274421

申请日：2019-09-04

Applicant: INSTITUT MINES-TELECOM

Inventor： Ghaya Rekaya ,  Akram Abouseif ,  Yves Jaouen

IPC: H04B10/079 ,  H04L1/00 ,  H04L1/20

Abstract: A decoder for determining an estimate of a vector of information symbols carried by optical signals propagating along a multi-core fiber in an optical fiber transmission channel according to two or more cores is provided. The decoder is implemented in an optical receiver. The optical signals are encoded using a space-time coding scheme and/or scrambled by at least one scrambling device arranged in the optical fiber transmission channel according to a predefined scrambling function. The decoder comprises a processing unit configured to adaptively: determine, in response to a temporal condition, one or more channel quality indicators from the optical signals; determine a decoding algorithm according to a target quality of service metric and on the one or more channel quality indicators; update the predefined scrambling function and/or the space-time coding scheme depending on the target quality of service metric and on the one or more channel quality indicators. The decoder further comprises a symbol estimation unit configured to determine an estimate of a vector of information symbols by applying the decoding algorithm to the optical signals.

公开(公告)号：US11637631B2

公开(公告)日：2023-04-25

申请号：US17050351

申请日：2019-04-10

Applicant: INSTITUT MINES-TELECOM

Inventor： Ghaya Rekaya ,  Akram Abouseif ,  Yves Jaouen

IPC: H04J14/02 ,  H04B10/2581 ,  H04B10/2507 ,  H04B10/50 ,  H04B10/516 ,  H04B10/60

Abstract: The various embodiments provide 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 the 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 the two or more cores, and at least one scrambling device arranged in the optical fiber transmission channel for scrambling the two or more cores, each of the at least one scrambling device being configured to determine permuted cores by applying the scrambling function to the two or more cores and to redistribute the optical signals according to the permuted cores.