The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 10038516 B1

Date of Patent:

Jul. 31, 2018

Filed:

Dec. 02, 2015

Spectral inversion detection for polarization-division multiplexed optical transmission

Applicant:

Xieon Networks S.à.r.l., Senningerberg, LU;

Inventors:

Stefano Calabro, Munich, DE;

Bernhard Spinnler, Oberhaching, DE;

Assignee:

Xieon Networks S.a.r.l., Senningerberg, LU;

Attorney:

Nelson Mullins Riley & Scarborough LLP

Primary Examiner:

Agustin Bello

Int. Cl.

CPC ...

H04B 10/00 (2013.01); H04J 14/06 (2006.01); G02F 1/225 (2006.01); H04B 10/50 (2013.01); G02F 1/21 (2006.01);

U.S. Cl.

CPC ...

H04J 14/06 (2013.01); G02F 1/2255 (2013.01); H04B 10/5053 (2013.01); G02F 2001/212 (2013.01); G02F 2201/58 (2013.01); G02F 2203/07 (2013.01);

Abstract

Disclosed herein is a modulator () for polarization-division multiplexing (PDM) transmission. The modulator () comprises first and second DP-MZMs () associated with first and second polarizations, each DP-MZM () having an input for an in-phase and a quadrature driving signal for modulating the in-phase and quadrature components of an optical signal according to respective transfer functions, and a detector () suitable for detecting light comprising at least a portion of the light outputted by the first DP-MZM () and a portion of the light outputted by the second DP-MZM (). The modulator () is adapted to superimpose a first pilot signal on one of the in-phase and quadrature driving signals of the first DP-MZM () and on one of the in-phase and quadrature driving signals of the second DP-MZM (), and a second pilot signal on the respective other of the in-phase and quadrature driving signals of the first and second DP-MZMs (). Further, the first and second pilot signals are chosen such that the signal detected by said detector () is indicative as to whether the slopes of the transfer functions are different for the in-phase and quadrature components of one of the first and second DP-MZMs () and identical for the other of the first and second DP-MZMs ().

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