Noise reduction in optical communications networks

Details Noise reduction in optical communications networks Noise reduction in optical communications networks

2002-12-17

2010-12-28

Liu, Li (Department: 2613)

Optical communications

Multiplex

Wavelength division or frequency division

C398S082000, C398S097000, C359S337100

Reexamination Certificate

active

07860396

ABSTRACT:
The add path of a dense wavelength division multiplexing (DWDM) add/drop node comprises an n:1 coupler for combining n signal sources. The combined signal is amplified and then demultiplexed. Each output of the demultiplexer is passed through a variable optical attenuator (VOA) and the VOA outputs multiplexed to form the add signal. Channels carrying no add signal and not used to control the added signals are attenuated to zero to remove a broadband noise contribution from those channels. The signal sources are run at maximum power and the signals of those channels are attenuated by the respective VOAs to control their amplitude and optimize the optical signal to noise ratio of the add signal.

REFERENCES:
patent: 5436921 (1995-07-01), Corio
patent: 5504827 (1996-04-01), Schimpe
patent: 5917625 (1999-06-01), Ogusu et al.
patent: 6285479 (2001-09-01), Okazaki
patent: 6288810 (2001-09-01), Grasso et al.
patent: 6323994 (2001-11-01), Li
patent: 6400498 (2002-06-01), Shimomura et al.
patent: 6504963 (2003-01-01), Fang et al.
patent: 6538782 (2003-03-01), Otsuka et al.
patent: 6633430 (2003-10-01), Monnard et al.
patent: 7106969 (2006-09-01), Lichtman et al.
patent: 2001/0040710 (2001-11-01), Sharratt et al.
patent: 2002/0105695 (2002-08-01), DeGrange et al.
patent: 2003/0002104 (2003-01-01), Caroli et al.
patent: 43 26 522 (1995-02-01), None
patent: 0 242 802 (1989-10-01), None
patent: 0 766 357 (1997-04-01), None
patent: 0 766 358 (1997-04-01), None
patent: 0 959 577 (1999-11-01), None
patent: 0 967 752 (1999-12-01), None
patent: 1 006 688 (2000-06-01), None
patent: 1 065 821 (2001-01-01), None
patent: 1 089 479 (2001-04-01), None
patent: 0 098 465 (2001-05-01), None
patent: 1 120 925 (2001-08-01), None
patent: 1 156 607 (2001-11-01), None
patent: 1156607 (2001-11-01), None
patent: 2 362 525 (2001-11-01), None
patent: WO 01/61903 (2001-08-01), None

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