Patent ID: 7623789
Filing Date: 2009-11-24
Classification: H04J

Abstract:
1. An optical add/drop node for bidirectional communication on a single fiber path in an optical WDM network, the optical add/drop node comprising: two main ports for connection in the single fiber path; a wavelength selective add/drop filter connected between the two main ports; an internal first drop filter connected to the wavelength selective add/drop filter and not connected in the single fiber path; at least one receiver connected to the internal first drop filter; and at least one source connected to the internal first drop filter, the add/drop filter branching or deflecting light, arriving at the optical add/drop node on one of the two main ports and having wavelengths of first WDM channels, to the internal first drop filter, the internal first drop filter connected to branch or deflect light to said at least one receiver and to receive light from said at least one source and let it pass to the wavelength selective add/drop filter to pass the wavelength selective add/drop filter to said one of the two main ports to be issued therefrom to the single fiber path when the node is connected in an optical WDM network.