Gain equalization in DWDM networks

Details Gain equalization in DWDM networks Gain equalization in DWDM networks

2005-09-13

2005-09-13

Sedighian, M. R. (Department: 2633)

Optical communications

Multiplex

Wavelength division or frequency division

C398S083000, C398S025000, C398S038000

Reexamination Certificate

active

06944401

ABSTRACT:
A method of controlling a network (115) through which information is transmitted in channels (λ1, λ2, . . . λn) among nodes includes: (a) providing at a node a device (108) for removing from the network (115) and replacing on the network (115) a selected one (λi) of the channels, the device (108) including a first input port from the network (115) to the node and a first output port from the node to the network (115); (b) taking a measure of the strength (PλiDROP) of the received channel (λiDROP); (c) regenerating the channel (λiIN); (d) adjusting (114) the strength (PλiADD) of the regenerated channel (λiIN) to approximate the strengths of the remaining channels ((λ1, λ2, . . . λn)-λi; and (e) combining the regenerated and strength-adjusted channel (λiADD) with the remaining channels ((λ1, λ2, . . . λn)-λi) at the output port. The method further or alternatively includes (f) calculating an average signal strength (PAVERAGE) for each active channel; (g) establishing a target signal strength (PiTARGET) for each channel; (h) determining a required change (ΔPi) in signal strength; and, (i) sending the node a message to adjust the strength of a signal coupled to the first output port.

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