Patents by Inventor Fatih Yaman

Fatih Yaman has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20220182170
    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.
    Type: Application
    Filed: December 6, 2021
    Publication date: June 9, 2022
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Fatih YAMAN, Shinsuke FUJISAWA, Hussam BATSHON, Takigawa YOSHINARI, Ryuji AIDA, Takanori INOUE, Eduardo Rodriguez, Yoshihisa INADA
  • Publication number: 20220173808
    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.
    Type: Application
    Filed: December 1, 2021
    Publication date: June 2, 2022
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Fatih YAMAN, Kohei NAKAMURA, Takanori INOUE, Eduardo Mateo RODRIGUEZ, Shinsuke FUJISAWA, Hussam BATSHON, Yoshihisa INADA, Takaaki OGATA
  • Patent number: 11296786
    Abstract: Aspects of the present disclosure describe distributed fiber optic sensing (DFOS) systems, methods, and structures that advantageously overcome problems encountered when operating DFOS systems over operational telecommunications facilities namely, cross-phase modulation, and uneven amplitude profiles through the use of a novel constant amplitude coded DFOS employing out-of-band signaling.
    Type: Grant
    Filed: April 4, 2021
    Date of Patent: April 5, 2022
    Inventors: Yue-Kai Huang, Ezra Ip, Fatih Yaman
  • Publication number: 20220085896
    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.
    Type: Application
    Filed: September 7, 2021
    Publication date: March 17, 2022
    Applicants: NEC Laboratories America, Inc., NEC Corporation
    Inventors: Fatih YAMAN, Shinsuke FUJISAWA, Hussam BATSHON, Yoshinari Takigawa, Ryu Kurahashi, Ryuji Aida, Kohei NAKAMURA, Takanori INOUE, Eduardo RODRIGUEZ, Yoshihisa INADA
  • Patent number: 11270200
    Abstract: Aspects of the present disclosure describe a method for digital coherent transmission systems that advantageously provides low-complexity, single-step nonlinearity compensation based on artificial intelligence (AI) implemented in a deep neuron network (DNN).
    Type: Grant
    Filed: February 26, 2019
    Date of Patent: March 8, 2022
    Inventors: Shaoliang Zhang, Fatih Yaman, Ting Wang, Eduardo Rodriguez, Yoshihisa Inada, Kohei Nakamura, Takanori Inoue
  • Publication number: 20220011195
    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.
    Type: Application
    Filed: June 7, 2021
    Publication date: January 13, 2022
    Applicants: NEC LABORATORIES AMERICA, INC, NEC Corporation
    Inventors: Fatih YAMAN, Eduardo Mateo RODRIGUEZ, Shinsuke FUJISAWA, Hussam BATSHON, Kohei NAKAMURA, Takanori INOUE, Yoshihisa INADA, Takaaki OGATA
  • Publication number: 20210356613
    Abstract: Aspects of the present disclosure are directed to laser interferometric systems, methods, and structures exhibiting superior laser phase noise tolerance particularly in seismic detection applications wherein laser requirements are advantageously relaxed by employing a novel configuration wherein the same laser which generates an outgoing signal is coherently detected using the same laser as local oscillator and fiber turnarounds are employed that result in the cancellation and/or mitigation of undesired mechanical vibration.
    Type: Application
    Filed: May 4, 2021
    Publication date: November 18, 2021
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Ezra IP, Yue-Kai HUANG, Fatih YAMAN
  • Publication number: 20210356316
    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).
    Type: Application
    Filed: May 6, 2021
    Publication date: November 18, 2021
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Ezra IP, Yue-Kai HUANG, Fatih YAMAN, Shinsuke FUJISAWA
  • Patent number: 11159200
    Abstract: Aspects of the present disclosure describe systems, methods, and structures for high speed frequency hopping distributed acoustic sensing using an acousto-optic modulated (AOM), gated re-circulating loop and a frequency shifted receiver local oscillator. Using the re-circulating loop controlled by the AOM to generate frequency-hopping pulse(s) increases DAS acoustic bandwidth overcomes infirmities exhibited in the art that generate multiple frequency patterns that are not suitable for long-distance DAS. Additionally, by employing frequency shifted local oscillator (LO) with asymmetric in band detection, bandwidth requirements are reduced by one half.
    Type: Grant
    Filed: January 26, 2019
    Date of Patent: October 26, 2021
    Inventors: Yue-Kai Huang, Ezra Ip, Giovanni Milione, Fatih Yaman
  • Publication number: 20210314063
    Abstract: Aspects of the present disclosure describe distributed fiber optic sensing (DFOS) systems, methods, and structures that advantageously overcome problems encountered when operating DFOS systems over operational telecommunications facilities namely, cross-phase modulation, and uneven amplitude profiles through the use of a novel constant amplitude coded DFOS employing out-of-band signaling.
    Type: Application
    Filed: April 4, 2021
    Publication date: October 7, 2021
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Yue-Kai HUANG, Ezra IP, Fatih YAMAN
  • Publication number: 20210256347
    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.
    Type: Application
    Filed: January 12, 2021
    Publication date: August 19, 2021
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Shinsuke FUJISAWA, Fatih YAMAN, Eduardo Mateo RODRIGUEZ, Yoshihisa INADA, Kohei NAKAMURA, Takanori INOUE
  • Patent number: 11043786
    Abstract: Aspects of the present disclosure describe systems, methods, and structures that advantageously amplify optical signals through the effect of optical pump signals generated by a multicore laser diode and multicore rare-earth doped optical fiber in optical communication with a 3D waveguide structure and a multicore input signal fiber providing a plurality of optical signals for amplification.
    Type: Grant
    Filed: April 18, 2018
    Date of Patent: June 22, 2021
    Inventors: Fatih Yaman, Shaoliang Zhang, Eduardo Mateo Rodriguez, Kohei Nakamura, Yoshihisa Inada, Takanori Inoue
  • Publication number: 20200403383
    Abstract: Aspects of the present disclosure describe systems, methods and structures for providing semiconductor amplifiers exhibiting a low polarization-dependent gain.
    Type: Application
    Filed: June 17, 2020
    Publication date: December 24, 2020
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Fatih YAMAN, Shinsuke FUJISAWA, Eduardo Mateo RODRIGUEZ, Kohei NAKAMURA, Takanori INOUE, Yoshihisa INADA, Takaaki OGATA
  • Patent number: 10833770
    Abstract: Aspects of the present disclosure describe systems, methods and structures for optical fiber nonlinearity compensation using neural networks that advantageously employ machine learning (ML) algorithms for nonlinearity compensation (NLC) that advantageously provide a system-agnostic model independent of link parameters, and yet still achieve a similar or better performance at a lower complexity as compared with prior-art methods. Systems, methods, and structures according to aspects of the present disclosure include a data-driven model using the neural network (NN) to predict received signal nonlinearity without prior knowledge of the link parameters. Operationally, the NN is provided with intra-channel cross-phase modulation (IXPM) and intra-channel four-wave mixing (IFWM) triplets that advantageously provide a more direct pathway to underlying nonlinear interactions.
    Type: Grant
    Filed: June 21, 2019
    Date of Patent: November 10, 2020
    Assignee: NEC Corporation
    Inventors: Shaoliang Zhang, Fatih Yaman, Eduardo Rodriguez, Yoshihisa Inada, Kohei Nakamura, Takanori Inoue
  • Patent number: 10741992
    Abstract: An unrepeatered transmission system includes a receiver coupled to a receive span; a transmitter coupled to the receive span; and a plurality of cascaded amplifiers in the receive span with dedicated fiber cores to supply one or more optical pumps from the receiver to each amplifier, wherein the plurality of cascaded amplifiers increase system reach by increasing the length of a back span in an unrepeatered link.
    Type: Grant
    Filed: October 4, 2017
    Date of Patent: August 11, 2020
    Assignee: NEC Corporation
    Inventors: Ezra Ip, Yue-Kai Huang, Fatih Yaman, Shaoliang Zhang
  • Patent number: 10708094
    Abstract: Systems and methods for transmission filtering are provided. A receiver includes an input coupled to a transmission line to receive distorted optical symbols. A distortion filter is coupled to the input to replace the distorted optical symbols with predicted symbols using a trained neural network. A decoder is coupled to the distortion filter to decode the predicted symbols.
    Type: Grant
    Filed: October 5, 2018
    Date of Patent: July 7, 2020
    Assignee: NEC Corporation
    Inventors: Fatih Yaman, Shaoliang Zhang, Eduardo Mateo Rodriguez, Yoshihisa Inada, Yue-Kai Huang, Weiyang Mo
  • Patent number: 10581216
    Abstract: An optical communication substrate includes a plurality of cores to communicate optical signals; a rectangular input delivering a pump laser, and a shaped portion to combine the optical signals and the pump laser into a ring geometry at an output.
    Type: Grant
    Filed: May 3, 2017
    Date of Patent: March 3, 2020
    Assignee: NEC Corporation
    Inventors: Fatih Yaman, Shaoliang Zhang, Eduardo Mateo Rodriquez, Takanori Inoue, Yoshihisa Inada, Takaaki Ogata
  • Publication number: 20190393965
    Abstract: Aspects of the present disclosure describe systems, methods and structures for optical fiber nonlinearity compensation using neural networks that advantageously employ machine learning (ML) algorithms for nonlinearity compensation (NLC) that advantageously provide a system-agnostic model independent of link parameters, and yet still achieve a similar or better performance at a lower complexity as compared with prior-art methods. Systems, methods, and structures according to aspects of the present disclosure include a data-driven model using the neural network (NN) to predict received signal nonlinearity without prior knowledge of the link parameters. Operationally, the NN is provided with intra-channel cross-phase modulation (IXPM) and intra-channel four-wave mixing (IFWM) triplets that advantageously provide a more direct pathway to underlying nonlinear interactions.
    Type: Application
    Filed: June 21, 2019
    Publication date: December 26, 2019
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Shaoliang ZHANG, Fatih YAMAN, Eduardo RODRIGUEZ, Yoshihisa INADA, Kohei NAKAMURA, Takanori INOUE
  • Patent number: 10476728
    Abstract: Systems and methods for optical data transport, including controlling data transport across an optical transmission medium by generating two-dimensional (2D) distribution matchers (DMs) based on probabilistic fold shaping (PFS) and arbitrary probabilistic shaping (APS). The 2D PFS-based DM is can encode any N-fold rotationally symmetrical Quadrature Amplitude Modulation (QAM) format by applying the 2D PFS-based DM only to symbols in one quadrant based on a target entropy. A fold index yield uniform distribution is determined, and is utilized to carry generated uniform distributed parity check bits across the optical transmission medium. The 2D APS-based DM can encode any arbitrary modulation formats by encoding uniform binary data to generate non-uniform target symbols, and generating a probability distribution for the target symbols by indirectly applying the 2D APS-based DM based on a target probability distribution and a detected code rate of generated FEC code.
    Type: Grant
    Filed: October 5, 2018
    Date of Patent: November 12, 2019
    Assignee: NEC Corporation
    Inventors: Shaoliang Zhang, Fatih Yaman, Ting Wang, Zhen Qu
  • Patent number: 10466172
    Abstract: A system and method are provided for distributed acoustic sensing in a multimode optical fiber. The system includes a transmitter for simultaneously propagating a sequence of M light pulses through the multimode optical fiber using a spatial mode selected from a set of N spatial modes provided by a spatial mode selector for the transmitter that is coupled to an input to the multimode optical fiber, with M and N being respective integers greater than one. The system further includes a receiver for receiving the sequence of M light pulses at an output of the multimode optical fiber and detecting an environmental perturbation in the multimode optical fiber based on an evaluation of a propagation of the sequence of M light pulses through the multimode optical fiber.
    Type: Grant
    Filed: August 16, 2017
    Date of Patent: November 5, 2019
    Assignee: NEC Corporation
    Inventors: Fatih Yaman, Giovanni Milione, Shaoliang Zhang, Yue-Kai Huang