Patent · US Active

Using shortened codewords in passive optical networks

US11909523B2 · kind B2 · utility

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32Claims

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Assignee

NOKIA SOLUTIONS AND NETWORKS OY · FI

Inventors

Yannick Lefevre · Heverlee, BE
Amitkumar Mahadevan · Eatontown, US
Werner Van Hoof · Aartselaar, BE

Key dates

Filing date	Jan 12, 2022
Grant date	Feb 20, 2024
Priority date	—
Expiry date	May 29, 2042

Classification

Technology area (CPC H)Electricity
CPC primaryH04Q2011/0079
WIPO fieldTelecommunications
WIPO sectorElectrical engineering

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.