A method and apparatus for testing a plurality of optical circuits provides a single broadband light source and means for splitting the light produced by the broadband light source in order to produce a plurality of light beams each of which is directed to a selected one of the plurality of optical circuits.

Field of the Invention This invention pertains to optical communications systems, in general, and to interferometers used in communications systems, in particular.

Field of the Invention This invention pertains to optical communications systems, in general, and to an optical network and a method of operating an optical network, in particular.

Field of the Invention This invention pertains to optical communications systems, in general, and to an optical network and a method of operating and optical network, in particular.

Process for making high yield, DC stable proton exchanged waveguide for active integrated Optic Devices