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：US20190074908A1

公开(公告)日：2019-03-07

申请号：US15696939

申请日：2017-09-06

Applicant: Nokia Solutions and Networks OY

Inventor： Sian Chong Lee ,  Vincent Houtsma ,  Doutje van Veen ,  Chen Zhu ,  Noriaki Kaneda ,  Michael Eggleston

IPC: H04B10/61 ,  G06F11/14

Abstract: A coherent optical receiver having an analog electrical circuit connected to combine the outputs of multiple photodetectors to generate an electrical output signal from which the data encoded in a received modulated optical signal can be recovered in a robust and straightforward manner. In an example embodiment, the analog electrical circuit includes one or more transimpedance amplifiers connected between the photodetectors and the receiver's output port. The coherent optical receiver may include a dual-polarization optical hybrid coupled to eight photodiodes to enable polarization-insensitive detection of the received modulated optical signal. The signal processing implemented in the analog electrical circuit advantageously enables the use of relatively inexpensive local-oscillator sources that may have relaxed specifications with respect to linewidth and wavelength stability. Different embodiments of the analog electrical circuit can be used to enable the receiver to receive amplitude- and intensity-encoded modulated optical signals.

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：US11309973B2

公开(公告)日：2022-04-19

申请号：US15885385

申请日：2018-01-31

Applicant: Nokia Solutions and Networks OY

Inventor： Vincent Houtsma ,  Doutje van Veen

IPC: H04B10/00 ,  H04B10/64 ,  H04J14/08 ,  H04B10/572 ,  H04B10/079

Abstract: A passive optical network having an optical-signal monitor configured to monitor carrier-wavelength drifts during optical bursts transmitted between the optical line terminal and optical network units thereof. In an example embodiment, the optical-signal monitor uses heterodyne beating between two differently delayed portions of an optical burst to generate an estimate of the carrier-wavelength drift during that optical burst. The passive optical network may also include an electronic controller configured to use the estimates generated by the optical-signal monitor to make configuration changes at the optical network units and/or implement other control measures directed at reducing to an acceptable level the amounts of carrier-wavelength drift during the optical bursts and/or mitigating some adverse effects thereof.

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.