WDM optical communication system

Optical communications – Multiplex – Wavelength division or frequency division

Reexamination Certificate

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Details

C398S152000

Reexamination Certificate

active

10084884

ABSTRACT:
The present invention provides a WDM optical communication system, comprising input means and output means for an optical signal, an optical fibre path connecting signal-transmissively said input and output means, wherein the optical signal is amplified by means of Raman amplification and said optical fibre path comprises at least one Raman amplifier, further comprising WDM means for coupling at least two polarized pump radiation wavelengths with wavelengths less than the signal radiation wavelength into said Raman amplifier, wherein one pump radiation wavelength has a selected different polarization with respect to the polarization of the other pump radiation wavelengths.

REFERENCES:
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patent: 4881790 (1989-11-01), Mollenauer
patent: 5959750 (1999-09-01), Eskildsen et al.
patent: 1022870 (2000-07-01), None
patent: WO 00/49721 (2000-08-01), None
WO 00 49721 A (CORVIS CORP) Aug. 24, 2000.
Sugizaki R et al.: “Polarization insensitive broadband transparent DCF module with faraday rotator mirror, Raman-amplified by single polarization diode-laser” OFC/IOOC '99 . Optical Fiber Communication Conference, vol. 1, Feb. 21-26, 1999, pp. 279-281, XP002175123, San Diego, CA, USA.
Peter Riedel “Untersuchungen zum kunftigen Einsatz solitonengestutzter faseroptischer Nachrichtenubertragung bei 1,3, μm Wellenlange” Hamburg 1998, pp. 5-117.
Y. Emori, et al. “100nm bandwidth flat gain Raman amplifiers pumped and gain-equalized by 12-wavelength-channel WDM high power laser diodes” Opto-Technology Laboratory, Furukawa Electic Co., Ltd, Optical Fibre Communications Conference 1999, pp. PD19-1 to PD19-3.
Bigo, et al.: “Tbit/s (128×40 Gbits/s WDM) Transmission Over 3×100 km of TeraLight Fibre” ECOC 2000, 26thEuropean Conference on Optical Communication, Sep. 3-7, 2000 Munich, Germany, vol. 5 Plenary Papers and Tutorials Post-Deadline papers.

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