Patent · US Active

Control of LO signal frequency offset between optical transmitters and receivers

US9935720B2 · kind B2 · utility

1Cited by

2References

20Claims

0Family size

Assignee

Cisco Technology, Inc. · US

Inventors

Christopher Fludger · Nuremberg, DE
Thomas Duthel · Nuremberg, DE
Joerg Leykauf · Heroldsbach, DE
Karsten Michaelsen · Eckental, DE

Key dates

Filing date	Jul 7, 2017
Grant date	Apr 3, 2018
Priority date	—
Expiry date	Jul 7, 2037

Classification

Technology area (CPC H)Electricity
CPC primaryH04L27/00
WIPO fieldTelecommunications
WIPO sectorElectrical engineering

Abstract

A system includes a laser configured to generate a tunable optical frequency. The system also includes an optical transmitter to map baseband data to symbols represented in a digital modulation constellation, add a frequency offset to the digital modulation constellation to cause the digital modulation constellation to rotate at a rate equal to the added frequency offset, modulate the optical frequency with the rotating digital modulation constellation, and transmit the resulting modulated optical frequency. The system also includes an optical receiver to receive the transmitted modulated optical frequency and, using the tunable optical frequency, detect the rotating digital modulation constellation conveyed by the received modulated optical frequency.

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