公开(公告)号：US12262159B2

公开(公告)日：2025-03-25

申请号：US18129201

申请日：2023-03-31

Applicant: Nokia Solutions and Networks Oy

Inventor： Doutje Van Veen ,  Vincent Houtsma

IPC: H04Q11/00 ,  H04B10/69 ,  H04L25/02

Abstract: A technique for presetting the tap values of the equalizer component of an OLT burst mode receiver is used to eliminate (or at least shorten) the conventional equalizer training period, which is known to delay the ability to transmit useful data from the ONU to the OLT. The disclosed technique is based on a collection of three known frequency responses: (1) the ONU transmitter response FT(f); (2) the OLT receiver response FR(f); and (3) a specific fiber frequency response FF(f) calculated for the span connecting the transmitter and receiver. FT(f) and FR(f) are known quantities measured during component testing prior to installation. The frequency response of the fiber span may be determined by a combination of the known ONU transmitter measurements with a measurement of the separation between the ONU and the OLT (“reach”) created during a previous activation (ranging) process.

公开(公告)号：US20240334093A1

公开(公告)日：2024-10-03

申请号：US18129201

申请日：2023-03-31

Applicant: Nokia Solutions and Networks Oy

Inventor： Doutje Van Veen ,  Vincent Houtsma

IPC: H04Q11/00 ,  H04L25/02

CPC classification number: H04Q11/0066 ,  H04L25/022

Abstract: A technique for presetting the tap values of the equalizer component of an OLT burst mode receiver is used to eliminate (or at least shorten) the conventional equalizer training period, which is known to delay the ability to transmit useful data from the ONU to the OLT. The disclosed technique is based on a collection of three known frequency responses: (1) the ONU transmitter response FT(f); (2) the OLT receiver response FR(f); and (3) a specific fiber frequency response FF(f) calculated for the span connecting the transmitter and receiver. FT(f) and FR(f) are known quantities measured during component testing prior to installation. The frequency response of the fiber span may be determined by a combination of the known ONU transmitter measurements with a measurement of the separation between the ONU and the OLT (“reach”) created during a previous activation (ranging) process.

公开(公告)号：US20240267658A1

公开(公告)日：2024-08-08

申请号：US18105307

申请日：2023-02-03

Applicant: Nokia Solutions and Networks Oy

Inventor： Doutje Van Veen ,  Vincent Houtsma

IPC: H04Q11/00 ,  H04J14/02

CPC classification number: H04Q11/0067 ,  H04J14/0216 ,  H04J14/028 ,  H04Q2011/0045 ,  H04Q2011/0064 ,  H04Q2011/0088

Abstract: A method and apparatus is proposed for performing the ONU activation process in a PON having a standard line rate of 50 G or higher. The method and apparatus are based upon having the OLT instruct any activating ONUs to transmit at a line rate that is less than 50 G, which allows for an OLT receiver without any particular equalization configuration to accurately recover the upstream burst-mode transmissions from the activating ONUs. Once the activation process is completed, the OLT may instruct the new ONUs to reset their transmitters to operate at the higher line rate of the PON. Alternatively, at the end of the activation process, the new ONUs may be configured to automatically reset their transmitters to higher line rate.

公开(公告)号：US12015886B2

公开(公告)日：2024-06-18

申请号：US17495076

申请日：2021-10-06

Applicant: Nokia Solutions and Networks OY

Inventor： Doutje Van Veen ,  Vincent Houtsma ,  Amitkumar Mahadevan ,  Edward Harstead

IPC: H04Q11/00 ,  H04B10/27 ,  H04B10/293 ,  H04B10/564 ,  H04J14/02

CPC classification number: H04Q11/0067 ,  H04B10/27 ,  H04B10/293 ,  H04B10/564 ,  H04J14/0282 ,  H04Q2011/0049

Abstract: Various embodiments of the disclosed PON system enable approximate leveling of the optical-modulation amplitudes in a sequence of optical bursts received by a system's OLT from a plurality of ONUs. Some embodiments additionally enable approximate leveling of the average optical power, received at the OLT from different ONUs, in such a sequence. Some embodiments may rely on control messaging between the OLT and ONUs to perform one or both types of leveling. The disclosed leveling may advantageously provide an effective tool for optimizing upstream transmission for high-speed TDM-PONs.

公开(公告)号：US11902720B2

公开(公告)日：2024-02-13

申请号：US17683870

申请日：2022-03-01

Applicant: Nokia Solutions and Networks Oy

Inventor： Doutje Van Veen ,  Amitkumar Mahadevan ,  Vincent Houtsma

IPC: H04Q11/00 ,  H04B10/27 ,  H04J3/16

CPC classification number: H04Q11/0062 ,  H04B10/27 ,  H04J3/16 ,  H04Q2011/0064

Abstract: An optical line terminal (OLT) operating within a multi-rate PON is configured to perform downstream timeslot scheduling among an associated number of ONUs so as to minimize the change in information rate from one scheduled ONU timeslot to the next. In this manner, the clock recovery component at each ONU is best able to follow the change in information rates, remaining locked on the system clock regardless of the specific implementation of the clock and data recovery (CDR) functionality at a given ONU. The OLT may schedule timeslot assignments that span a pair of adjacent parts (referred to as a two-part cycle), with the first part having timeslots assigned from the lowest information rate (e.g., NRZ) to the highest (e.g., PAM4) and the second part's timeslots assigned in the reverse order; that is, from the highest to the lowest information rate.

公开(公告)号：US20230379607A1

公开(公告)日：2023-11-23

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.

公开(公告)号：US20230283933A1

公开(公告)日：2023-09-07

申请号：US17683870

申请日：2022-03-01

Applicant: Nokia Solutions and Networks Oy

Inventor： Doutje Van Veen ,  Amitkumar Mahadevan ,  Vincent Houtsma

IPC: H04Q11/00 ,  H04B10/27 ,  H04J3/16

CPC classification number: H04Q11/0062 ,  H04B10/27 ,  H04J3/16 ,  H04Q2011/0064

Abstract: An optical line terminal (OLT) operating within a multi-rate PON is configured to perform downstream timeslot scheduling among an associated number of ONUs so as to minimize the change in information rate from one scheduled ONU timeslot to the next. In this manner, the clock recovery component at each ONU is best able to follow the change in information rates, remaining locked on the system clock regardless of the specific implementation of the clock and data recovery (CDR) functionality at a given ONU. The OLT may schedule timeslot assignments that span a pair of adjacent parts (referred to as a two-part cycle), with the first part having timeslots assigned from the lowest information rate (e.g., NRZ) to the highest (e.g., PAM4) and the second part's timeslots assigned in the reverse order; that is, from the highest to the lowest information rate.

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).

公开(公告)号：US12088439B1

公开(公告)日：2024-09-10

申请号：US18125225

申请日：2023-03-23

Applicant: Nokia Solutions and Networks Oy

Inventor： Doutje Van Veen ,  Vincent Houtsma

IPC: H04L25/03 ,  H04B10/2575

CPC classification number: H04L25/03878 ,  H04B10/25759 ,  H04L25/03006 ,  H04L2025/03815

Abstract: A phased approach to training of an upstream burst mode receiver equalizer is disclosed that proceeds incrementally through modulation schemes requiring increasing levels of equalization in a manner where the equalizer maintains the capability to accurately recover data transmitted during each training phase. The phased approach includes an initial training phase (one or more upstream bursts) using a simple modulation format, one or more intermediate phases of different modulation schemes, and a final training phase using the PON-defined (high) line rate upstream modulation format. Equalizer settings generated during the initial phase are used as a starting point for the equalization process in the next training phase, and so on, until the equalizer training reaches the final phase where the ONU uses the PON-defined upstream data rate and the burst mode equalizer is updated accordingly.

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.