The main advantages of the ROADM are:
ROADM functionality originally appeared in long-haul DWDM equipment, but by 2005, it began to appear in metro optical systems because of the need to build out major metropolitan networks in order to deal with the traffic driven by the increasing demand for packet-based services.
The switching or reconfiguration functions of a ROADM can be achieved using a variety of switching technologies including MEMS, Liquid crystal, thermo optic and beam-steering switches in planar waveguide circuits, and tunable optical filter technology.
WIPO ASSIGNS PATENT TO HUAWEI MARINE NETWORKS FOR "UNDERWATER BRANCHING UNIT OF OPTICAL ADD/ DROP MULTIPLEXER, CORRESPONDING OPTICAL TRANSMISSION METHOD AND SYSTEM THEREOF" (CHINESE INVENTORS)
Feb 01, 2011; GENEVA, Feb. 1 -- Publication No. WO/2011/009341 was published on Jan. 27. Title of the invention: "UNDERWATER BRANCHING UNIT OF...
Patent No. 7,650,075 Issued on Jan. 19, Assigned to Hitachi Communication Technologies for Optical Add-drop Multiplexer (Japanese Inventor)
Jan 20, 2010; ALEXANDRIA, Va., Jan. 20 -- Nobuhiko Kikuchi, Tokyo has developed an optical add-drop multiplexer. The inventor was issued U.S....