Optical add/drop arrangement for ring networks employing...

Optical communications – Multiplex – Optical local area network

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C398S067000

Reexamination Certificate

active

06947670

ABSTRACT:
An add/drop arrangement using broadband optical couplers provides a low-loss, highly flexible add/drop capability for survivable wavelength division multiplexed (WDM) ring networks. At each node in the ring having the broadband optical coupler-based add/drop element, a portion of optical signal power of the entire WDM signal (i.e., all optical channels) is tapped off so that one or more optical channels of particular wavelengths can be dropped at the node. Information (e.g., data) to be added at the node is supplied in an optical channel that is added to the WDM signal via the broadband coupler. Because the add/drop element uses a broadband coupler, another portion of optical signal power of the WDM signal, including any added optical channels, passes through the node onto the ring. Depending on the specific ring topology being used with the broadband coupler-based add/drop arrangement, additional wavelength assignment and handling measures may be required. For example, certain ring topologies may experience interference between optical channels of particular wavelengths due to possible re-circulation of these optical channels beyond the add and drop nodes (e.g., after an optical channel passes its destination node). According to one illustrative embodiment, a node is equipped to perform wavelength conversion and/or wavelength suppression to prevent undesirable re-circulation of optical channels.

REFERENCES:
patent: 5625478 (1997-04-01), Doerr et al.
patent: 5647035 (1997-07-01), Cadeddu et al.
patent: 5680235 (1997-10-01), Johansson
patent: 5717795 (1998-02-01), Sharma et al.
patent: 5751454 (1998-05-01), MacDonald et al.
patent: 5760934 (1998-06-01), Sutter et al.
patent: 5771112 (1998-06-01), Hamel et al.
patent: 5774244 (1998-06-01), Tandon et al.
patent: 5822095 (1998-10-01), Taga
patent: 5864414 (1999-01-01), Barnsley et al.
patent: 5875272 (1999-02-01), Kewitsch et al.
patent: 5889610 (1999-03-01), Fatehi et al.
patent: 5896212 (1999-04-01), Sotom et al.
patent: 5903371 (1999-05-01), Arecco et al.
patent: 5986783 (1999-11-01), Sharma et al.
patent: 6021233 (2000-02-01), Koehler
patent: 6049523 (2000-04-01), Anderson et al.
patent: 6137603 (2000-10-01), Henmi
patent: 6192173 (2001-02-01), Solheim et al.
patent: 6278536 (2001-08-01), Kai et al.
patent: 6307986 (2001-10-01), Duerksen et al.
patent: WO 97/06614 (1997-02-01), None
Rob Batchellor, “Optical Networking the Ericsson Way”, OADM Workshop, Apr. 23-24, 1998, pp. 39-42.
B. S. Johansson, et al., “Flexible bus: A self-restoring optical ADM ring architecture”, Electronics Letters, vol. 32, No. 25, Dec. 5, 1996, pp. 2338-2339.
C. R. Giles, et al., “Low-Loss ADD/DROP Multiplexers for WDM Lightwave Networks”, IOOC-95, ThC2-1, pp. 66-67.
Manish Sharma, et al., “WDM Ring Network Using a Centralized Multiwavelength Light Source and Add-Drop Multiplexing Filters”, Journal of Lightwave Technology, vol. 15, No. 6, Jun. 1997, pp. 917-929.
Ivan P. Kaminow, et al., “Terrestrial Amplified Lightwave System Design”, Optical Fiber Telecommunications IIIA, Academic Press, San Diego, CA (1997), pp. 269-275, and pp. 567-573.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Optical add/drop arrangement for ring networks employing... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optical add/drop arrangement for ring networks employing..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical add/drop arrangement for ring networks employing... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3422401

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.