Chromatic dispersion tolerant PAM-M transceiver for optical routing to extended paths
US12047208B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 12, 2020 |
| Grant date | Jul 23, 2024 |
| Priority date | — |
| Expiry date | May 12, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/2513
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Methods in an optical receiver, for decoding a received M-level pulse-amplitude-modulated, PAM-M, optical signal. An example method comprises, for a first interval, decoding (510) the received PAM-M optical signal using a standard PAM-M decoder with M-1 thresholds, using first sampling times, to obtain a first set of decoded bits, and decoding (520) the received PAM-M optical signal using a duobinary decoder with 2M-2 thresholds, at second sampling times offset from the first sampling times, to obtain second set of decoded bits. The method further comprises calculating (530) first and second error metrics corresponding to the first and second sets of decoded bits, respectively, and selecting (540) the standard PAM-M decoder or the duobinary decoder for subsequent decoding of the received PAM-M optical signal, based on the first and second error metrics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.