Optical waveguide/grating device for filtering optical wavelengths
AssigneeTelefonaktiebolaget L M Ericsson
InventorOlof G. Sahlen
Life of this patent
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Abstract
A tunable optical filter device has a wavelength selective optical filter that includes a grating structure arranged in a waveguide structure. The grating structure is formed so that it comprises two controllable grating sections electrically isolated from each other and which have different grating periods.
Claims13
A tunable optical filter device comprising a grating structure arranged in a waveguide structure, wherein the grating structure comprises two controllable grating sections electrically isolated from each other, the grating sections having different grating periods;
- and light of a predetermined wavelength that enters the waveguide structure is reflected back through the waveguide structure by the grating structure.
A tunable grating assisted directional coupler comprising a grating structure with two controllable grating sections being electrically separated from each other, the grating structure being included in a waveguide structure comprising two waveguides arranged in parallel, the waveguides having different dispersion characteristics from one another and being separated from each other laterally or vertically by a given distance, the grating sections further having different grating periods.
A tunable optical filter device comprising a wavelength selective optical filter comprising a grating structure in a first waveguide section, the grating structure including two controllable grating sections which are electrically separated from each other and having different grating periods, the optical filter further comprising a second waveguide section forming an amplifying section, whereby a device for stimulated amplification is formed.
Dependencies are inferred from the claim text.