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    OPTICAL RING NETWORK HAVING ENHANCED SECURITY AND REDUCED LOSS
    11.
    发明专利
    OPTICAL RING NETWORK HAVING ENHANCED SECURITY AND REDUCED LOSS 未知

    公开(公告)号：CA2311144A1

    公开(公告)日：2000-12-15

    申请号：CA2311144

    申请日：2000-06-02

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： ADAMS LAURA ELLEN ,  BROBERG ROBERT MARIO ,  ANDERSON JON

    IPC: H04B10/20 ,  H04B10/02 ,  H04B10/2581 ,  H04J14/00 ,  H04J14/02 ,  H04L12/42

    Abstract: A fiber-optic WDM ring carries communication traffic among a plurality of nodes, each node associated with respective subscriber premises. The WDM ring includes an optical add-drop module (OADM) at each node for adding and dropping signals associated with that node. The WDM ring also includes active terminal equipment at each node for conditioning incoming and outgoing data and for converting between the optical and electrical domains. The OADM at each of at least some nodes, to be referred to as enhanced nodes, is situated at a site physically separated from the powered terminal equipment, and is coupled to the powered terminal equipment via an optical medium. At each enhanced node, traffic not destined for that node is routed through no more than one enclosure on subscriber premises that requires a connection. If there is such enclosure, it contains the OADM.

    WIDEBAND OPTICAL PACKET RING NETWORK
    13.
    发明专利
    WIDEBAND OPTICAL PACKET RING NETWORK 未知

    公开(公告)号：CA2310949A1

    公开(公告)日：2000-12-15

    申请号：CA2310949

    申请日：2000-06-05

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： ANDERSON JON ,  BRINKMAN WILLIAM FRANK ,  ADAMS LAURA ELLEN ,  BROBERG ROBERT MARIO

    IPC: H04B10/20 ,  H04J14/00 ,  H04J14/02 ,  H04L12/42 ,  H04Q11/00

    Abstract: A dual-ring, bi-directional optical fiber transmission system interconnects a series of add/drop nodes with a hub, such that multiple, widely spaced coarse wavelength division multiplexed (C-WDM) channels are established on each ring. At each node, an optical add/drop module (OADM) includes broadband filters (BBF's), such as dielectric thin film filters, arranged to (a) extract, for the purposes of a receiver, or (b) insert, for the purposes of a transmitter, information in one or more of the channels. The signals in the one or more channels are coupled to the OADM's by a standard optical transceiver, which performs modulation and demodulation. Each filter passband can be populated with multiple dense wavelength division multiplexed (D-WDM) channels, so that the capacity of traffic that can be handled at each node can be easily upgraded. The transceiver is, in turn, coupled to packet framer, such as an IP packet over SONET framer, which supplies received packets to, and receives outgoing packets from, a conventional Layer 3 routing engine. While in most instances, endpoints at each of the nodes communicate with other endpoints connected to the hub, if desired, endpoints at one or more nodes can communicate directly with endpoints on other nodes, using a direct or bypass connection through the hub. The bypass can be "permanent" or controlled via a switch, such as a micro-electro-mechanical switch (MEMS).

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