Blind equalization for polarization-switched QPSK optical communications

Patent metadata

Field	Value
Publication number	US-8995834-B2
Application number	US-201113335326-A
Country	US
Kind code	B2
Filing date	Dec 22, 2011
Priority date	Dec 22, 2011
Publication date	Mar 31, 2015
Grant date	Mar 31, 2015

Abstract

An apparatus, e.g. an optical receiver, includes an optical front end and an equalizer. The front end is configured for receiving an optical signal bearing first and second symbols on respective first and second polarization channels. The equalizer is configured to 1) select a first cost function if the first symbol has greater energy than the second symbol, 2) select a second different cost function if the second symbol has a greater energy than the first symbol, and 3) based on the selected cost function, update coefficients of an adaptive filter configured to demultiplex and equalize the first and second polarization channels.

First claim

What is claimed is:

1. An apparatus comprising:
an optical front end for receiving an optical signal bearing first and second symbols on respective first and second polarization channels;
an equalizer configured to:
select a first cost function if said first symbol has greater energy than said second symbol;
select a second different cost function if said second symbol has a greater energy than said first symbol; and
based on the selected cost function, update coefficients…

Assignees

• Krongold Brian
• Pfau Timo
• Kaneda Noriaki
• Alcatel Lucent

Inventors

• Krongold Brian
• Pfau Timo
• Kaneda Noriaki

Classifications

• H04J14/06 Primary

  Electricity · mapped topic

• H04B10/6971

  Electricity · mapped topic