An official website of the United States government

All-optical gain controlled L-band EDFA structure with reduced four-wave mixing cross-talk

Patent
US-6437906-B1
Inventor

DI PASQUALE FABRIZIO (IT)

SACCHI GIOVANNI (IT)

ZERMANI ALBERTO (IT)

TUROLLA SILVIA (IT)

Assignee
CISCO TECH IND (US)
Country
United States
Dates
  • Priority:
    2000/11/22
  • Grant:
    2002/08/20
Description
This web page summarizes information in PubChem about patent US-6437906-B1. This includes chemicals mentioned, as reported by PubChem contributors, as well as other content, such as title, abstract, and International Patent Classification (IPC) codes. To read more about how this page was constructed, please visit the PubChem patents help page.

1 Abstract

An approach for minimizing four-wave mixing (FWM) cross-talk (XT) in a WDM (wavelength division multiplexing) optical communication system is disclosed. An Erbium doped Fiber Amplifier (EDFA) includes a pre-amplifier that receives an input optical signal and outputs an amplified input optical signal. The pre-amplifier includes the following components: a first active fiber that carries WDM signals corresponding to a particular operating band (e.g., L-band); a co-propagating pump laser that induces high inversion in a portion of the first active fiber; a filter that is coupled to the first active fiber and slightly inverts the gain tilt of the WDM signals and suppresses the amplified spontaneous emission (ASE) lights accumulated at wavelengths shorter than the signal bandwidth; a second active fiber that is coupled to the filter; and a counter-propagating pump laser that induces high inversion in a portion of the second active fiber. An optical unit (e.g., an optical add/drop module, a gain equalizing filter (GEF), or a dispersion compensating fiber (DCF)) may be coupled to the pre-amplifier and receives the amplified input signal, in which the optical unit introduces a prescribed loss to the WDM system. A booster amplifier is coupled to the optical unit and is configured to amplify a signal that is output from the optical unit. An automatic optical gain control (AOGC) mechanism of the EDFA provides nearly constant gain that is independent of the number of channels utilized in the WDM system and also minimizes system penalties due to fast relaxation oscillations induced by adding/dropping of channels.

2 Full Text

3 Important Dates

3.1 Priority Date

2000/11/22

3.2 Filing Date

2000/11/22

3.3 Publication Date

2002/08/20

3.4 Grant Date

2002/08/20

4 Inventor

DI PASQUALE FABRIZIO (IT)

SACCHI GIOVANNI (IT)

ZERMANI ALBERTO (IT)

TUROLLA SILVIA (IT)

5 Assignee

CISCO TECH IND (US)

6 Country

United States

7 Linked Chemicals

7.1 PubChem Compounds

7.2 PubChem Substances

8 Linked Taxonomies

9 Classification

9.1 IPC

H01S3/094

H01S3/067 (inventive)

H01S3/102

H01S3/16

9.2 CPC

H01S3/06754 (inventive, first)

H01S3/06716

H01S3/094011

H01S3/102

H01S3/1608

H01S2301/02

10 Citations

11 Cited By

12 Similar Patents

13 Information Sources

  1. Google Patents
    LICENSE
    "Google Patents Research Data" by Google, based on data provided by IFI CLAIMS Patent Services and OntoChem, is licensed under a Creative Commons Attribution 4.0 International License.
    https://creativecommons.org/licenses/by/4.0/legalcode
  2. PubChem
CONTENTS