Optical communications – Multiplex – Broadcast and distribution system
Reexamination Certificate
2006-04-11
2006-04-11
Phan, Hanh (Department: 2638)
Optical communications
Multiplex
Broadcast and distribution system
C398S059000, C398S066000, C398S067000, C398S068000, C398S069000, C398S070000, C398S071000, C398S079000, C398S082000, C398S083000, C398S045000, C398S048000, C398S050000, C398S058000, C398S056000
Reexamination Certificate
active
07027733
ABSTRACT:
A method and a system in which selected wavelengths of a wavelength division multiplexed (WDM) signal are modulated with multicast data for multicasting data services on an optical network. The WDM signal is received from a hub node of the optical network, such as a unidirectional ring network or a bi-directional ring network. A four-port wavelength crossbar switch (4WCS) selectably switches selected wavelengths from the optical network to a modulator loop. The modulator loop includes a multicast modulator that modulates the selected plurality of wavelengths with the multicast data. Each modulated wavelength is then switched back to the optical network by the 4WCS switch, and sent to a plurality of subscriber nodes of the optical network. This architecture allows a facility provider to be physically separated from a content provider, and affords the flexibility of selectively delivering multicast content to individual subscribers.
REFERENCES:
patent: 5559624 (1996-09-01), Darcie et al.
patent: 5923449 (1999-07-01), Doerr et al.
patent: 5930016 (1999-07-01), Brorson et al.
patent: 5940197 (1999-08-01), Ryu
patent: 5940551 (1999-08-01), Oberg
patent: 6067389 (2000-05-01), Fatehi et al.
patent: 6091869 (2000-07-01), Sundelin
patent: 6097533 (2000-08-01), Atlas
patent: 6122095 (2000-09-01), Fatehi
patent: 6130765 (2000-10-01), Gautheron et al.
patent: 6175432 (2001-01-01), Wu et al.
patent: 6181849 (2001-01-01), Lin et al.
patent: 6195187 (2001-02-01), Soref et al.
patent: 6201909 (2001-03-01), Kewitsch et al.
patent: 6205267 (2001-03-01), Aksyuk et al.
patent: 6211980 (2001-04-01), Terahara
patent: 6212314 (2001-04-01), Ford
patent: 6233074 (2001-05-01), Lahat et al.
patent: 6275329 (2001-08-01), Sieben
patent: 6288810 (2001-09-01), Grasso et al.
patent: 6289145 (2001-09-01), Solgaard et al.
patent: 6295397 (2001-09-01), Augustsson
patent: 6351323 (2002-02-01), Onaka et al.
patent: 1 039 670 (2000-09-01), None
Stuart S. Wagner, et al., “Multiwavelength Ring Networks for Switch Consolidation and Interconnection”, Discovering A New World Of Communications, IEEE Conference, vol. 3, Jun. 14, 1992, pp. 1173-1179.
N. Fujimoto, et al., “Broadband Subscriber Loop System Using Multi-Gigabit Intelligent Optical Shuttle Nodes”,, Global Telecommunications Conference, IEEE, vol. 3, Nov. 15, 1987, pp. 1449-1454.
Adel A. J. Saleh, et al., “Architectural Principles of Optical Regional and Metropolitan Access Networks”, Journal Of Lightwave Technology, vol. 17, No. 12, Dec. 1999, pp. 2431-2448.
Tadasu Ishikawa, et al., “LiNbO3Optical Waveguide Modulator for Bidirectional Transmission”, Electronics and Communications in Japan, Part 2, vol. 77, No. 9, Sep. 1994, pp. 85-94.
Cedric F. Lam , et al., “Programmable Optical Multicasting in a Regional/Metro Area Network Using A Wavelength Selective Optical Cross-connect”, Proceedings 27thEuropean Conference On Optical Communications ECOC '01, vol. 4, Sep. 30, 2001, pp. 614-615.
Feuer Mark D.
Frigo Nicholas J.
Lam Cedric F.
AT&T Corp.
Phan Hanh
LandOfFree
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