OPTICAL SIGNAL POWER CONTROL METHOD AT ADD/DROP NODES IN WDM OPTICAL COMMUNICATION SYSTEM

    公开(公告)号:JP2003101514A

    公开(公告)日:2003-04-04

    申请号:JP2002199360

    申请日:2002-07-09

    Abstract: PROBLEM TO BE SOLVED: To provide an optical signal power control method at add/drop nodes in WDM (wavelength division multiplex) optical communication system. SOLUTION: The level of optical signal power of selected optical channel processed in an add/drop node of a WDM system is adjusted as a function of signal power fluctuation of incoming WDM signals generated by gain ripple. In particular, a ripple fitting method is described. According to this method, optical signal power of each optical channel added by the add/drop node is adjusted to a level corresponding to a ripple profile of another optical channel routed through the add/drop node. According to this arrangement, gain ripple of a WDM signal outputted from the add/drop node is made to correspond almost to the gain ripple of a WDM signal arriving to the add/drop node.

    CIRCUITRY FOR MIXED-RATE OPTICAL COMMUNICATION NETWORKS

    公开(公告)号:CA2353654A1

    公开(公告)日:2002-03-08

    申请号:CA2353654

    申请日:2001-07-24

    Abstract: Circuitry for a node of an optical communication network has a mux and/or a demux. In one embodiment, the circuitry has a mux and a demux implemented on a single circuit board, where (1) the mux is configured to combine up to eight different incoming OC3/OC12 - rate electrical signals into a single outgoing OC48-rate electrical signal for conversion in to two copies of an outgoing OC48 optical signal and (2) the demux is configured to split a working incoming OC48- rate electrical signal (selected from two incoming OC48-rate electrical signals converted from two incoming OC48 optical signals) into up to eight different outgoing OC3/OC12- rate electrical signals. The node is configured to perform automatic signal provisioning, which may be (a) the addition of a new OC3/OC12 signal; (b) the deletion of an existing OC3/OC12 signal; (c) the rate- upgrading of an existing OC3 signal to an OC12 signal; or (d) the rate- downgrading of an existing OC12 signal to an OC3 signal. When adding a new OC12 signal or rate-upgradin g an existing OC3 signal, the node automatically determines how to move existing OC3/OC12 signals within the OC48 frame in order to accommodate the new OC12 signal. The node automatical ly communicates with the other node corresponding to the provisioned signal to automatically initiate corresponding signal provisioning at the other node.

    4.
    发明专利
    未知

    公开(公告)号:DE60103111T2

    公开(公告)日:2005-05-12

    申请号:DE60103111

    申请日:2001-08-14

    Abstract: Circuitry for a node of an optical communication network (102) has a mux (122) and/or a demux (132). In one embodiment, the circuitry has a mux (122) and a demux (132) implemented on a single circuit board, where (I) the mux (122) is configured to combine up to eight different incoming OC3/OC12-rate electrical signals (114) into a single outgoing OC48-rate electrical signal for conversion into two copies of an outgoing OC48 optical signal (106,108) and (II) the demux (132) is configured to split a working incoming OC48-rate electrical signal (selected from two incoming OC48-rate electrical signals converted from two incoming OC48 optical signals (110,112)) into up to eight different outgoing OC3/OC12-rate electrical signals (120). The node is configured to perform automatic signal provisioning, which may be (a) the addition of a new OC3/OC12 signal; (b) the deletion of an existing OC3/OC12 signal; (c) the rate-upgrading of an existing OC3 signal to an OC12 signal; or (d) the rate-downgrading of an existing OC12 signal to an OC3 signal. When adding a new OC12 signal or rate-upgrading an existing OC3 signal, the node automatically determines how to move existing OC3/OC12 signals within the OC48 frame in order to accommodate the new OC12 signal. The node automatically communicates with the other node corresponding to the provisioned signal to automatically initiate corresponding signal provisioning at the other node.

    5.
    发明专利
    未知

    公开(公告)号:DE60200060T2

    公开(公告)日:2004-07-22

    申请号:DE60200060

    申请日:2002-05-22

    Abstract: Optical signal power levels for selected optical channels processed within an add/drop node in a wavelength division multiplexed (WDM) system are adjusted as a function of variations in signal power in an incoming WDM signal caused by gain ripple. In particular, a "ripple fitting" method is described whereby the optical signal power of individual optical channels being added at the add/drop node are adjusted to levels that correspond to the ripple profile of other optical channels being routed through the add/drop node. In this manner, the gain ripple in the WDM signal being output from the add/drop node approximately corresponds to the gain ripple in the incoming WDM signal at the node.

    6.
    发明专利
    未知

    公开(公告)号:DE60200060D1

    公开(公告)日:2003-11-20

    申请号:DE60200060

    申请日:2002-05-22

    Abstract: Optical signal power levels for selected optical channels processed within an add/drop node in a wavelength division multiplexed (WDM) system are adjusted as a function of variations in signal power in an incoming WDM signal caused by gain ripple. In particular, a "ripple fitting" method is described whereby the optical signal power of individual optical channels being added at the add/drop node are adjusted to levels that correspond to the ripple profile of other optical channels being routed through the add/drop node. In this manner, the gain ripple in the WDM signal being output from the add/drop node approximately corresponds to the gain ripple in the incoming WDM signal at the node.

    WAVELENGTH-SELECTIVE ADD/DROP ARRANGEMENT FOR OPTICAL COMMUNICATION SYSTEMS

    公开(公告)号:CA2384236A1

    公开(公告)日:2002-12-29

    申请号:CA2384236

    申请日:2002-04-29

    Abstract: A WDM input signal received at an add/drop node is coupled onto both a "drop" transmission path and a "through" transmission path within the node. Optical channels to be dropped are then processed within the "drop" path, such as by optical demultiplexing. Because a copy of the same WBM input signal is routed on the "through" path, a dynamically configurable and programmable wavelength block er selectively blocks the optical channels that are being dropped from the WDM input signal and passes through those optical channels not being dropped onto the "through" path. In an "add" path within the node, optical channels are selectively added, such as by using optical multiplexing. Those optical channels from the multiplexed optical signal that are not designated for "add" (e.g., "unused" channels) are selectively blocked within the "add" transmission path. Optical channels from the "add" and "through" paths are then combined form a WDM output signal.

    CIRCUITRY FOR MIXED-RATE OPTICAL COMMUNICATION NETWORKS

    公开(公告)号:CA2353654C

    公开(公告)日:2007-10-09

    申请号:CA2353654

    申请日:2001-07-24

    Abstract: Circuitry for a node of an optical communication network has a mux and/or a demux. In one embodiment, the circuitry has a mux and a demux implemented on a single circuit board, where (1) the mux is configured to combine up to eight different incoming OC3/OC12 - rate electrical signals into a single outgoing OC48-rate electrical signal for conversion in to two copies of an outgoing OC48 optical signal and (2) the demux is configured to split a working incoming OC48- rate electrical signal (selected from two incoming OC48-rate electrical signals converted from two incoming OC48 optical signals) into up to eight different outgoing OC3/OC12- rate electrical signals. The node is configured to perform automatic signal provisioning, which may be (a) the addition of a new OC3/OC12 signal; (b) the deletion of an existing OC3/OC12 signal; (c) the rate- upgrading of an existing OC3 signal to an OC12 signal; or (d) the rate- downgrading of an existing OC12 signal to an OC3 signal. When adding a new OC12 signal or rate-upgradin g an existing OC3 signal, the node automatically determines how to move existing OC3/OC12 signals within the OC48 frame in order to accommodate the new OC12 signal. The node automatical ly communicates with the other node corresponding to the provisioned signal to automatically initiate corresponding signal provisioning at the other node.

    10.
    发明专利
    未知

    公开(公告)号:DE60103111D1

    公开(公告)日:2004-06-09

    申请号:DE60103111

    申请日:2001-08-14

    Abstract: Circuitry for a node of an optical communication network (102) has a mux (122) and/or a demux (132). In one embodiment, the circuitry has a mux (122) and a demux (132) implemented on a single circuit board, where (I) the mux (122) is configured to combine up to eight different incoming OC3/OC12-rate electrical signals (114) into a single outgoing OC48-rate electrical signal for conversion into two copies of an outgoing OC48 optical signal (106,108) and (II) the demux (132) is configured to split a working incoming OC48-rate electrical signal (selected from two incoming OC48-rate electrical signals converted from two incoming OC48 optical signals (110,112)) into up to eight different outgoing OC3/OC12-rate electrical signals (120). The node is configured to perform automatic signal provisioning, which may be (a) the addition of a new OC3/OC12 signal; (b) the deletion of an existing OC3/OC12 signal; (c) the rate-upgrading of an existing OC3 signal to an OC12 signal; or (d) the rate-downgrading of an existing OC12 signal to an OC3 signal. When adding a new OC12 signal or rate-upgrading an existing OC3 signal, the node automatically determines how to move existing OC3/OC12 signals within the OC48 frame in order to accommodate the new OC12 signal. The node automatically communicates with the other node corresponding to the provisioned signal to automatically initiate corresponding signal provisioning at the other node.

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