Patent · US Active

Adaptive PMD equalizer and implementation

US8744279B2 · kind B2 · utility

4Cited by

6References

25Claims

0Family size

Assignee

VIASAT, INC. · US

Inventors

Fan Mo · Hinckley, US
Sameep Dave · Hinckley, US
Lawrence W. Esker · Ann Arbor, US

Key dates

Filing date	Aug 8, 2011
Grant date	Jun 3, 2014
Priority date	—
Expiry date	Sep 21, 2032

Classification

Technology area (CPC H)Electricity
CPC primaryH04L25/03057
WIPO fieldTelecommunications
WIPO sectorElectrical engineering

Abstract

Polarization mode dispersion (PMD) in a dual-pole optical communications network is compensated for using an adaptive PMD equalizer. The PMD equalizer may include a number of substantially identical filter modules that provide partial outputs which may be combined to form a PMD compensated output. A constant modulus algorithm (CMA)-based equalizer may track PMD across both poles and generates an error signal. The CMA-based equalizer includes a filter bank, and uses an update algorithm and tap/output adjustments based on a difference between combined tap energies and an index, and feedback from a forward error correction code frame synchronizer.

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