公开(公告)号：US20240259109A1

公开(公告)日：2024-08-01

申请号：US18421898

申请日：2024-01-24

Applicant: Nokia Solutions and Networks OY

Inventor： Domenico Marsella ,  Andrea Carnio ,  Luca Gabriele Razzetti ,  Carlo Costantini ,  Giancarlo Gavioli

IPC: H04B10/61 ,  H04B10/69

CPC classification number: H04B10/6163 ,  H04B10/695

Abstract: A method and apparatus are provided for compensating incoming signals in a receiver of an optical fiber communication system for degradation due to nonlinear optical effects in the transmission channel. The compensation is performed, inter alia, in circuitry to compute perturbation terms that are representative of predicted optical nonlinearity of the transmission channel, and circuitry to combine the perturbation terms with soft data symbols obtained from an input signal stream. The computation of the perturbation terms involves circuitry for converting an input stream of soft data symbols to an input stream of hard data symbols, and then operating on the input stream of hard data symbols according to a model of nonlinear effects in the transmission channel.

公开(公告)号：US10756822B1

公开(公告)日：2020-08-25

申请号：US16553142

申请日：2019-08-27

Applicant: Nokia Solutions and Networks Oy

Inventor： Domenico Marsella ,  Carlo Costantini ,  Luca Gabriele Razzetti ,  Giancarlo Gavioli

IPC: H04B10/00 ,  H04B10/61 ,  H04B10/079 ,  H04J14/00

Abstract: An apparatus includes a digital signal processor to perform perturbation-based optical nonlinearity compensation of optical data signals of a communication stream. The digital signal processor includes first digital circuits to calculate multiplicative factors for corrections to the optical data signals from products of values of the optical data signals at a reduced set of times. The reduced set is a down-sampling of the sequence of consecutive symbol times of the communication stream. The digital signal processor also includes second digital circuits to calculate the multiplicative factors for corrections to the optical data signals at the consecutive symbol times by interpolating the multiplicative factors evaluated at the reduced set of times.