Patent · US Active

Control of LO signal frequency offset between optical transmitters and receivers

US9735888B2 · kind B2 · utility

8Cited by

1References

22Claims

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	Oct 23, 2015
Grant date	Aug 15, 2017
Priority date	—
Expiry date	Nov 5, 2035

Classification

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

Abstract

In an optical receiver, an optical local oscillator (LO) frequency is generated. A modulated optical frequency is received at the optical receiver. An LO-signal frequency offset between the received modulated optical frequency and the optical LO frequency is determined. A determination is made as to whether the LO-signal frequency offset is in one of multiple predefined non-overlapping target windows that cover respective non-zero LO-signal frequency offsets. If it is determined that the LO-signal frequency offset is not in one of the target windows, the optical LO frequency is tuned to drive the LO-signal frequency offset toward one of the target windows to ensure the LO-signal frequency offset is non-zero.

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