Patent ID: 6038046
Filing Date: 2000-03-14
Classification: H04J

Abstract:
A branching system having an optical ADM function for branching or inserting a particular wavelength from a plurality of wavelengths in a WDM transmission comprising:an optical ADM with two inputs and two outputs for branching or inserting a particular wavelength from a plurality of wavelengths;a first optical coupling device with one input and two outputs for controlling optical coupling among the one input and the two outputs thereof;a second optical coupling device with two inputs and one output for controlling the optical coupling among the two inputs and one output thereof; andan optical amplifier for amplifying the optical signal,said optical ADM having a first input connected to a main signal transmission line input of the branching system, a first output connected to a main signal transmission line output of the branching system, a second input connected to the second optical coupling device, and a second output connected to the first optical coupling device,said first optical coupling device having a first output connected to the branch transmission line output of the branching system, and a second output connected to an input of the optical amplifier,said second optical coupling device having a first input connected to the branch transmission line input of the branching system, and a second input connected to an output of the optical amplifier.