公开(公告)号：US20220173808A1

公开(公告)日：2022-06-02

申请号：US17540132

申请日：2021-12-01

Applicant: NEC Laboratories America, Inc.

Inventor： Fatih YAMAN ,  Kohei NAKAMURA ,  Takanori INOUE ,  Eduardo Mateo RODRIGUEZ ,  Shinsuke FUJISAWA ,  Hussam BATSHON ,  Yoshihisa INADA ,  Takaaki OGATA

IPC: H04B10/2537 ,  H01S3/30 ,  H04B10/291

Abstract: Aspects of the present disclosure describe systems, methods. and structures in which guided acoustic Brillouin (GAWBS) noise is measured using a homodyne measurement technique and demonstrated using a number of optical fibers, such fibers being commonly used in contemporary optical communications systems. The measurements are made with single spans and determined to be consistent with separate multi-span long-distance measurements. Additionally, a technique for preparing an optical fiber exhibiting superior GAWBS noise characteristics by reducing coherence length of the optical fiber by spinning the fiber at a high rate during the drawing process such that birefringence coherence length is reduced.

公开(公告)号：US20240243540A1

公开(公告)日：2024-07-18

申请号：US18414425

申请日：2024-01-16

Applicant: NEC Laboratories America, Inc.

Inventor： Fatih YAMAN ,  Hussam BATSHON ,  Eduardo Fabian MATEO RODRIGUEZ ,  Yoshihisa INADA ,  Shinsuke FUJISAWA ,  Takanori INOUE

IPC: H01S3/10

CPC classification number: H01S3/10015 ,  H01S2301/04

Abstract: Dependence of EDFA gain shape on input power and input spectrum shape is modelled using a simple neural network-based architecture for amplifiers with different gains and output powers. The model can predict the gain within ±0.1 dB. While the model has good success predicting the performance of an EDFA it is trained with, it is not as successful when predicting a different EDFA, or the same EDFA with different pump power. Retraining the model with a small amount of supplementary data from a separate EDFA makes the model able to predict the performance of the second EDFA with little loss in performance. Experiments show that machine learning model of an EDFA is capable of modelling spectralhole burning effects accurately. As a result, it significantly outperforms black-box models that neglect inhomogenous effects. Model achieves an average RMSE error of 0.016 dB between the model and measurements.

公开(公告)号：US20220011195A1

公开(公告)日：2022-01-13

申请号：US17341033

申请日：2021-06-07

Applicant: NEC Laboratories America, Inc.

Inventor： Fatih YAMAN ,  Eduardo Mateo RODRIGUEZ ,  Shinsuke FUJISAWA ,  Hussam BATSHON ,  Kohei NAKAMURA ,  Takanori INOUE ,  Yoshihisa INADA ,  Takaaki OGATA

IPC: G01M11/00

Abstract: Aspects of the present disclosure describe a method for estimating mode field distribution in optical fibers from guided acoustic-wave Brillouin scattering wherein light for which the optical mode-field distribution is determined remains in the optical fibers and the distribution is made for light inside the fiber, and not at a fiber/air interface or other perturbation points to the fiber resulting in a more accurate representation of the optical mode-field distribution in the fiber. Since light is always in the fiber during the determination, no complicated fiber preparation steps or procedures are required and the mode-field distribution is determined as an average distribution along the length of the fiber under test.

公开(公告)号：US20220308290A1

公开(公告)日：2022-09-29

申请号：US17684408

申请日：2022-03-01

Applicant: NEC Laboratories America, Inc.

Inventor： Fatih YAMAN ,  Eduardo Mateo RODRIGUEZ ,  Hassam BATSHON ,  Shinsuke FUJISAWA ,  Kohei NAKAMURA ,  Takanori INOUE ,  Yoshihisa INADA

IPC: G02B6/27 ,  G02B6/42

Abstract: Aspects of the present disclosure describe methods for reducing guided acoustic wave Brillouin (GAWBS) noise in an optical fiber that may be included in an optical communications system by reducing the polarization diffusion length of the fiber by increasing the birefringence of the optical fiber, the increased birefringence of the optical fiber being increased with respect to its average magnitude. Additionally, the polarization diffusion length is reduced by reducing the coherence length of birefringence of the optical fiber.

公开(公告)号：US20220228859A1

公开(公告)日：2022-07-21

申请号：US17577315

申请日：2022-01-17

Applicant: NEC Laboratories America, Inc.

Inventor： Fatih YAMAN ,  Hussam BATSHON ,  Shinsuke FUJISAWA ,  Kohei NAKAMURA ,  Takanori INOUE ,  Eduardo Mateo RODRIGUEZ ,  Yoshihisa INADA

IPC: G01B11/27 ,  G01M11/00

Abstract: Aspects of the present disclosure describe estimating/measuring core-cladding concentricity error in optical fibers. In sharp contrast to the prior art, our inventive method is based on measuring a seemingly unrelated property of fibers called guided acoustic wave Brillouin scattering (GAWBS). As we shall show and describe, by analyzing this GAWBS property we advantageously determine what level of CCCE is exhibited by the optical fiber.

公开(公告)号：US20220278748A1

公开(公告)日：2022-09-01

申请号：US17336280

申请日：2021-06-01

Applicant: NEC Laboratories America, Inc.

Inventor： Fatih YAMAN ,  Eduardo Mateo RODRIGUEZ ,  Shinsuke FUJISAWA ,  Hussam BATSHON ,  Kohei NAKAMURA ,  Takanori INOUE ,  Yoshihisa INADA ,  Takaaki OGATA

IPC: H04B10/2537 ,  H04B10/61 ,  H01S3/30 ,  H01S3/067 ,  H01S3/16 ,  H01S3/10

Abstract: Aspects of the present disclosure are directed to systems, methods, and structures providing for the accurate measurement of guided acoustic-wave Brillouin scattering in optical fiber transmission systems and facilities.

公开(公告)号：US20220182170A1

公开(公告)日：2022-06-09

申请号：US17543616

申请日：2021-12-06

Applicant: NEC Laboratories America, Inc.

Inventor： Fatih YAMAN ,  Shinsuke FUJISAWA ,  Hussam BATSHON ,  Takigawa YOSHINARI ,  Ryuji AIDA ,  Takanori INOUE ,  Eduardo Rodriguez ,  Yoshihisa INADA

IPC: H04J14/02 ,  G02B6/44

Abstract: Aspects of the present disclosure describe systems, methods. and structures directed to an integrated 3-way branching unit switch module suitable for undersea application.

公开(公告)号：US20220085896A1

公开(公告)日：2022-03-17

申请号：US17468655

申请日：2021-09-07

Applicant: NEC Laboratories America, Inc.

Inventor： Fatih YAMAN ,  Shinsuke FUJISAWA ,  Hussam BATSHON ,  Yoshinari Takigawa ,  Ryu Kurahashi ,  Ryuji Aida ,  Kohei NAKAMURA ,  Takanori INOUE ,  Eduardo RODRIGUEZ ,  Yoshihisa INADA

IPC: H04B10/80 ,  G02B6/44

Abstract: Aspects of the present disclosure describe a three-way branching unit switch module having a small footprint suitable for application in an undersea application.

公开(公告)号：US20210356316A1

公开(公告)日：2021-11-18

申请号：US17314006

申请日：2021-05-06

Applicant: NEC Laboratories America, Inc.

Inventor： Ezra IP ,  Yue-Kai HUANG ,  Fatih YAMAN ,  Shinsuke FUJISAWA

IPC: G01H9/00 ,  H04B10/071 ,  H04Q11/00

Abstract: Aspects of the present disclosure are directed to alternative repeater design(s) that advantageously improve signal-to-noise of distributed acoustic sensing (DAS) systems using coherent detection of Rayleigh backscatter in multi-span links including inline amplification that may be employed—for example—in undersea submarine systems. The repeater designs incorporate Rayleigh combine units (RCU) and Rayleigh drop units (RDU) to reduce Rayleigh backscatter loss as Rayleigh signal(s) is/are routed to a link that propagates the backscatter signal in an opposite direction relative to interrogation pulse(s).

公开(公告)号：US20210256347A1

公开(公告)日：2021-08-19

申请号：US17147380

申请日：2021-01-12

Applicant: NEC Laboratories America, Inc.

Inventor： Shinsuke FUJISAWA ,  Fatih YAMAN ,  Eduardo Mateo RODRIGUEZ ,  Yoshihisa INADA ,  Kohei NAKAMURA ,  Takanori INOUE

IPC: G06N3/04 ,  H04B10/2543

Abstract: Aspects of the present disclosure describe optical transmission systems exhibiting low complexity fiber nonlinearity compensation provided by neural networks using lookup tables for multiplication operations.