Patent ID: 6879754
Filing Date: 2005-04-12
Classification: A61K,C07C,C07D,G02B,H04Q

Abstract:
1. A drop-before-add optical routing and switching system comprising: an input waveguide for carrying a multiplexed optical signal including over a plurality of wavelength channels represented by λ a plurality of second direction waveguides extending over a second direction and intersecting at N intersections with said input waveguide; and a plurality of wavelength selective grating switches disposed on said N intersections for selectively transmitting an optical signal of a selected wavelength into an associated one of said second direction waveguides for transmitting to a switching matrix for adding optical signals therefrom, said plurality of wavelength selective grating switches being movable to engage in an on state and disengage in an off state; further wherein said input waveguide carries a dropped optical signal consisting of optical signals of wavelengths not selected by said grating switches, further wherein the said first direction waveguides and second direction waveguides are formed from the same material.