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    System and method for multimodulation in a passive optical network
    11.
    发明授权
    System and method for multimodulation in a passive optical network 有权

    公开(公告)号：US12244348B2

    公开(公告)日：2025-03-04

    申请号：US17714959

    申请日：2022-04-06

    Applicant: NOKIA SOLUTIONS AND NETWORKS OY

    Inventor： Doutje Van Veen ,  Amitkumar Mahadevan ,  Vincent Houtsma

    IPC: H04B10/54 ,  H04L27/26

    Abstract: An optical line terminal (OLT) in flexible passive optical network (PON) transmits a downstream signal with two or more modulation formats, wherein at least one of the modulation formats is a modified PAMx modulation format and wherein x is greater than 2. The modified PAMx modulation encodes data bits such that the probability of at least one predetermined transition between amplitude levels is modified. Furthermore, an optical network unit (ONU) in the flexible PON is assigned to one of the plurality of modulation formats based on one or more parameters, such as configuration of the ONU and line conditions.

    COHERENT OPTICAL RECEIVER WITH TUNABLE LOCAL OSCILLATOR
    12.
    发明公开
    COHERENT OPTICAL RECEIVER WITH TUNABLE LOCAL OSCILLATOR 审中-公开

    公开(公告)号：US20240364426A1

    公开(公告)日：2024-10-31

    申请号：US18309730

    申请日：2023-04-28

    Applicant: Nokia Solutions and Networks Oy

    Inventor： Brian Stern ,  Robert Borkowski ,  Amitkumar Mahadevan

    IPC: H04B10/61

    CPC classification number: H04B10/6164 ,  H04B10/6165 ,  H04J14/08

    Abstract: Various example embodiments presented herein may be configured to support a passive optical network (PON) including an optical line terminal (OLT) and a set of optical network units (ONUs) where the OLT includes a coherent optical receiver configured to support reception of upstream optical bursts by the ONUs based on use of a wavemeter to control tuning of a local oscillator to track the wavelengths of the upstream optical bursts from the ONUs. In the coherent optical receiver, the local oscillator may be configured to provide a local oscillator signal for mixing with an upstream optical signal of an ONU and the wavemeter may be configured to determine a wavelength of the upstream optical signal of the ONU and instruct the local oscillator to tune the local oscillator signal to the wavelength of the upstream optical signal of the ONU. The coherent optical receiver may be used in other contexts.

    Method and apparatus for evaluating transmitter performance capabilities in a passive optical network
    13.
    发明授权
    Method and apparatus for evaluating transmitter performance capabilities in a passive optical network 有权

    公开(公告)号：US12126948B2

    公开(公告)日：2024-10-22

    申请号：US17746658

    申请日：2022-05-17

    Applicant: Nokia Solutions and Networks Oy

    Inventor： Doutje Van Veen ,  Amitkumar Mahadevan ,  Vincent Houtsma

    IPC: H04Q11/00 ,  H04B10/073 ,  H04B10/2557

    CPC classification number: H04Q11/0067 ,  H04B10/0731 ,  H04B10/2557 ,  H04Q2011/0083

    Abstract: A method and apparatus is proposed for accurately evaluating the performance of optical transmitters under test conditions (such as high bit-rate modulation formats) that compromise the operability of standard test equipment used for this purpose. The proposed apparatus and method are similar to the elements associated with existing testing standards based on an optical eye diagram, with an important distinction that allows for accurate measurements of the transmitter's performance to be made. In particular, the sampling point for collecting eye diagram data samples in the inventive arrangement is shifted by half a period with respect to the conventional mid-eye sampling point, eliminating the need to include representative reference equalizer in the test equipment and providing an evaluation not influenced by the test equipment, resulting in a more accurate measurement of transmitter-related distortions.

    SIGNAL ANALYSIS CAPABILITY
    17.
    发明申请
    SIGNAL ANALYSIS CAPABILITY 有权

    公开(公告)号：US20240413902A1

    公开(公告)日：2024-12-12

    申请号：US18331919

    申请日：2023-06-08

    Applicant: NOKIA SOLUTIONS AND NETWORKS OY

    Inventor： Robert Borkowski ,  Vincent Houtsma ,  Doutje Van Veen ,  Amitkumar Mahadevan ,  Kovendhan Vijayan

    IPC: H04B10/079

    Abstract: Various example embodiments of a signal analysis capability are presented herein. The signal analysis capability may be configured to support analysis of a signal for determining the signal integrity of the signal, where the signal integrity of the signal corresponds to a set of one or more measures of the quality of an electrical signal (e.g., one or more signal integrity metrics indicative of the signal integrity of the signal). The signal analysis capability may be configured to support analysis of a signal for determining the signal integrity of the signal for various types of signals which may be communicated within various types of communication networks. The signal analysis capability may be configured to support analysis of a signal for determining the signal integrity of the signal where the signal may include various types of data traffic (e.g., live data traffic, user data traffic, test data traffic, or the like).

    Forward error correction
    18.
    发明授权
    Forward error correction 有权

    公开(公告)号：US12034620B2

    公开(公告)日：2024-07-09

    申请号：US16811405

    申请日：2020-03-06

    Applicant: Nokia Solutions and Networks Oy

    Inventor： Amitkumar Mahadevan ,  Doutje Van Veen ,  Noriaki Kaneda ,  Vincent Houtsma ,  Paul Cautereels ,  Carl Mertens ,  Michael Fivez

    IPC: H04L43/0823 ,  G06F30/20 ,  H03M13/11 ,  G06F111/10

    CPC classification number: H04L43/0847 ,  G06F30/20 ,  H03M13/1102 ,  G06F2111/10

    Abstract: Various example embodiments for supporting forward error correction (FEC) in a communication system are presented. Various example embodiments for supporting FEC in a communication system may include selection of a FEC setting (e.g., an amount of puncturing and/or shortening of a FEC code, a FEC code, or the like) for a communication channel from a transmitter to a receiver based on channel characteristic information of the communication channel from the transmitter to the receiver (e.g., transfer function information, channel loss information, noise characteristic information, error information (e.g., bit error rate, error modeling, or the like), or the like). Various example embodiments for supporting FEC in a communication system, based on selection of a FEC setting for a communication channel based on channel characteristic information of the communication channel, may be applied within various types of communication systems, including various types of wired and/or wireless communication systems.

    Using shortened codewords in passive optical networks
    19.
    发明授权
    Using shortened codewords in passive optical networks 有权

    公开(公告)号：US11909523B2

    公开(公告)日：2024-02-20

    申请号：US17573930

    申请日：2022-01-12

    Applicant: Nokia Solutions and Networks Oy

    Inventor： Yannick Lefevre ,  Amitkumar Mahadevan ,  Werner Van Hoof

    IPC: H04B10/27 ,  H04L1/00

    CPC classification number: H04L1/0042 ,  H04B10/27

    Abstract: An upstream (US) optical line terminal (OLT) for a passive optical network having at least one downstream (DS) optical network unit (ONU). The OLT generates a trigger signal indicating a need to receive at least one US burst having a shortened codeword for a first forward error-correction (FEC) code. Based on the trigger signal, the OLT transmits a DS message instructing the ONU to transmit an US burst having a shortened codeword. The OLT receives and decodes the US burst having the shortened codeword using the first FEC code. During periods of high bit-error rate, the shortened codewords increase the ability of the OLT to decode the US bursts and keep communications from the ONU alive. The OLT can use the decoded US bursts to measure BER and, if appropriate, instruct the ONU to use a different FEC code.

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