SUMMARY OF THE INVENTION A fault detecting process generates optical Supervisory
Signals at a predetermined wavelength and combines the Supervisory Signals with one or …

Abstract In an Optical Add-Drop Multiplexer, a drop section comprises a Wavelength
Selective Switch (WSS) having at least one drop-port, the WSS being operative to couple a …

An optical wavelength division coupler 11 wavelength-divides a wavelength multiplexed
light to respective wavelength lights each of which is dropped to an optical gate switch 15-i …

In an optical add/drop multiplexer, an optical Switch is coupled to one or more outputs from a
demultiplexer. Accordingly, a dropped optical channel can be Switched between a receiver …

In accordance with the invention, an optical multiplexer includes at least one reconfigurable
add-drop unit that can add-drop one channel out of a large Set by Switching the light path …

The data carrying capacity of an optical? ber communi cation system can be increased by
transmitting optical data signals along an optical? ber in the communication system at a …

A reconfigurable optical add-drop multiplexer is disclosed including an optical splitter
receiving an input optical signal and splitting the input optical signal into a dropped optical …

Various deficiencies of the prior art are addressed by the present invention of system
method and apparatus for equal izing and add/dropping optical channels within an optical …

An optical wavelength add/drop multiplexer provides communications between two optical
links supporting wavelength division multiplexing (WDM). A wavelength slicer spatially …

An optical-wavelength division multiplexing System, method and branching unit. The
arrangement drops one, or more than one, predetermined wavelength signal (0, 2) from a …