公开(公告)号：US20230283377A1

公开(公告)日：2023-09-07

申请号：US17686927

申请日：2022-03-04

Applicant: Nokia Solutions and Networks Oy

Inventor： Doutje Van Veen ,  Vincent Houtsma

IPC: H04B10/272 ,  H04L7/00

CPC classification number: H04B10/272 ,  H04L7/0075

Abstract: Apparatus and method are disclosed that utilize a particular delay modulation technique (i.e., Miller coding) to encode 25 Gb/s data for inclusion with the 50 Gb/s NRZ data in a downstream broadcast transmission from an optical line terminal (OLT) to a plurality of optical network units (ONUs) through an optical distribution network (ODN). The specific Miller coding technique allows for a secondary data stream, operating at half the rate of the NRZ data) to supplement the primary 50 Gb/s NRZ transmission, since both signals are recovered using the same clocking circuitry at the ONU.

公开(公告)号：US20250096903A1

公开(公告)日：2025-03-20

申请号：US18469532

申请日：2023-09-18

Applicant: Nokia Solutions and Networks Oy

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

IPC: H04B10/532 ,  H04B10/50 ,  H04B10/60 ,  H04Q11/00

Abstract: Various example embodiments for supporting optical communications in an optical communication system may be configured to support dual-polarization based communications within the context of a direct detection based point-to-multipoint optical network (e.g., a passive optical network (PON) based on direction detection). Various example embodiments for supporting optical communications in an optical communication system may be configured to support optical communications based on application of dual polarizations to each of one or more wavelengths within the context of a direct detection based point-to-multipoint optical network to support multiple optical channels within the direct detection based point-to-multipoint optical network (e.g., a single wavelength with two polarizations to provide two optical channels, two wavelengths each with two polarizations to provide four optical channels, three wavelengths each with two polarizations to provide six optical channels, and so forth) and, thus, support increased data carrying capacity within the direct detection based point-to-multipoint optical network.

公开(公告)号：US12074644B2

公开(公告)日：2024-08-27

申请号：US18060817

申请日：2022-12-01

Applicant: Nokia Solutions and Networks Oy

Inventor： Doutje Van Veen ,  Vincent Houtsma

IPC: H04B10/516 ,  H04B10/079 ,  H04L1/00 ,  H04Q11/00

CPC classification number: H04B10/5161 ,  H04B10/07953 ,  H04L1/0003 ,  H04L1/0032 ,  H04L1/0042 ,  H04Q11/0067 ,  H04Q2011/0088

Abstract: A network element includes at least one processor and at least one memory. The at least one non-transitory memory including computer program code configured to, when executed by the at least one processor, cause the apparatus to determine whether a bit error rate (BER) of a FEC codeword is at or below a correctable BER, wherein the FEC codeword is transmitted between an OLT and ONU, a first percentage of the FEC codeword is at a lower order modulation, and a second percentage of the FEC codeword is at a higher order modulation, establish, based on a determination that the BER is at or below the correctable BER, a connection between the OLT and the ONU at the higher order modulation, and maintain, based on a determination that the BER is greater than the correctable BER, the connection between the OLT and the ONU at the lower order modulation.

公开(公告)号：US11973537B2

公开(公告)日：2024-04-30

申请号：US17686927

申请日：2022-03-04

Applicant: Nokia Solutions and Networks Oy

Inventor： Doutje Van Veen ,  Vincent Houtsma

IPC: H04B10/516 ,  H04B10/272 ,  H04J14/08 ,  H04L7/00

CPC classification number: H04B10/272 ,  H04B10/516 ,  H04B10/5161 ,  H04J14/08 ,  H04L7/0075

Abstract: Apparatus and method are disclosed that utilize a particular delay modulation technique (i.e., Miller coding) to encode 25 Gb/s data for inclusion with the 50 Gb/s NRZ data in a downstream broadcast transmission from an optical line terminal (OLT) to a plurality of optical network units (ONUs) through an optical distribution network (ODN). The specific Miller coding technique allows for a secondary data stream, operating at half the rate of the NRZ data) to supplement the primary 50 Gb/s NRZ transmission, since both signals are recovered using the same clocking circuitry at the ONU.

公开(公告)号：US20230327776A1

公开(公告)日：2023-10-12

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

CPC classification number: H04B10/541 ,  H04L27/2626

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.

公开(公告)号：US20250097612A1

公开(公告)日：2025-03-20

申请号：US18469515

申请日：2023-09-18

Applicant: Nokia Solutions and Networks Oy

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

IPC: H04Q11/00 ,  G02B6/293 ,  H04B10/25

Abstract: Various example embodiments for providing a passive optical network (PON), supporting communications between an optical line terminal (OLT) and a set of optical network units (ONUs) of a PON, are presented. The PON may be enabled based on use of an optical frequency comb (OFC), generated at the OLT and reconstructed at the ONUs for locking the OFC at the ONUs to the OFC at the OLT. The OFC may include a set of optical frequency lines used as seed lines for reconstruction of the OFC at the ONUs (e.g., the pair of OFC lines at the center of the OFC which may be used to regenerate locked OFCs at the ONUs), a set of optical frequency lines used to support downstream communications from the OLT to the ONUs, and a set of optical frequency lines used to support upstream communications from the ONUs to the OLT.

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.

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.

公开(公告)号：US20240323065A1

公开(公告)日：2024-09-26

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：US20220123863A1

公开(公告)日：2022-04-21

申请号：US17470293

申请日：2021-09-09

Applicant: Nokia Solutions and Networks Oy

Inventor： Yannick Lefevre ,  Adriaan de Lind van Wijngaarden ,  Jochen Maes ,  Vincent Houtsma ,  Doutje Van Veen ,  Amitkumar Mahadevan ,  Michaël Fivez

IPC: H04L1/00 ,  H03M13/00 ,  H04B10/516 ,  H04B10/60

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 the selection of a FEC setting for a communication channel from a transmitter to a receiver, e.g., the selection of a FEC setting for a communication channel, the selection of a FEC setting for a data burst sent over a communication channel, the selection of a FEC setting for a portion of a data burst sent over a communication channel, switching between FEC settings for different portions of a data burst over a communication channel, or the like, as well as various combinations thereof.