Integrateable band filter using waveguide grating routers
AssigneeLucent Technologies Inc.
InventorChristopher Richard Doerr
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Abstract
The inventors propose herein a novel band filter design for planar lightwave circuits. In one embodiment of the present invention, the band filter includes two waveguide grating routers connected by sets of substantially equal path length waveguides within each set separated on one side, wherein the waveguides of each set are formed such that optical signals having overlapping frequency ranges are propagated through adjacent waveguides. In addition, the waveguides of each set are spaced at their connection to the second waveguide grating router such that optical signals with predetermined optical frequency ranges are routed to selected, respective output ports. Some of the advantages of this novel band filter include compactness, sharp passband corners, and a lack of chromatic dispersion.
Claims15
A band filter, comprising:
- a first waveguide grating router;
- a second waveguide grating router;
- and
- a plurality of waveguides connecting the first waveguide grating router to the second waveguide grating router;
- wherein the connecting waveguides comprise one or mare sets of waveguides and wherein the waveguides of each set are spaced at their connections to the first waveguide grating router such that optical signals having overlapping frequency ranges are propagated through adjacent waveguides and the waveguides of each set are spaced at their connection to the second waveguide grating router such that optical signals with predetermined optical frequency ranges are routed to selected, respective output ports.
Dependencies are inferred from the claim text.