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US 6,643,432 B2Granted
Optical waveguide device and optical waveguide method
AssigneeFujitsu Limited
InventorMartin Bouda
Life of this patent
Estimating the term…
Abstract
An optical waveguide device comprises an input waveguide for converting incident light into a single optical mode, a plurality of output waveguides for splitting power of incident light and outputting it, and a tapered waveguide for connecting the input waveguide and the output waveguides, gradually increasing in width from the input waveguide toward the output waveguides, and the tapered waveguide has a non-adiabatic state, that is, a sufficiently large taper angle such that lower order optical modes couple into higher order optical modes while light propagates along the tapered waveguide.
Claims12
An optical waveguide device, comprising:
- a single optical mode input waveguide;
- a plurality of output waveguides;
- and
- a tapered waveguide for connecting said input waveguide and said output waveguides, gradually increasing in width from said input waveguide toward said output waveguides,
- wherein said tapered waveguide has a sufficiently large taper angle such that optical power in lower order optical modes couples into higher order optical modes while light propagates along the tapered waveguide,
- wherein width at a narrow end of said tapered waveguide is larger than width of said input waveguide but is set to a value small enough to support a discrete spectrum of a certain number of optical modes.
3 more elements
An optical waveguide device, comprising:
- a single optical mode input waveguide;
- a plurality of output waveguides;
- and
- a tapered waveguide for connecting said input waveguide and said output waveguides, gradually increasing in width from said input waveguide toward said output waveguides,
- wherein said tapered waveguide has a sufficiently large taper angle such that optical power in lower order optical modes couples into higher order optical modes while light propagates along the tapered waveguide,
- wherein said tapered waveguide has one or more linear taper planes in section made by optimizing the taper angle by a numerical analysis method such that a field intensity profile at a wide end of the tapered waveguide is maximally flat.
3 more elements
An optical waveguide device, comprising:
- a single optical mode input waveguide;
- a plurality of output waveguides;
- and
- a tapered waveguide for connecting said input waveguide and said output waveguides, gradually increasing in width from said input waveguide toward said output waveguides,
- wherein said tapered waveguide has a sufficiently large taper angle such that optical power in lower order optical modes couples into higher order optical modes while light propagates along the tapered waveguide,
- wherein each of said output waveguides has a width optimized by a numerical analysis method to obtain substantially equal power efficiency.
3 more elements
An optical waveguide device, comprising:
- a single optical mode input waveguide;
- a plurality of output waveguides;
- and
- a tapered waveguide for connecting said input waveguide and said output waveguides, gradually increasing in width from said input waveguide toward said output waveguides,
- wherein said tapered waveguide has a sufficiently large taper angle such that optical power in lower order optical modes couples into higher order optical modes while light propagates along the tapered waveguide,
- wherein said output waveguides are tapered, gradually increasing in width toward a wide end of said tapered waveguide.
3 more elements
An optical waveguide method, comprising the steps of:
- converting incident light into a single optical mode;
- and
- after guiding the converted light into a waveguide having a sufficiently large taper angle such that optical power in lower order optical modes couples into higher order optical modes, splitting power of the guided light into a plurality of powers, out outputting them,
- wherein a field intensity profile at a wide end of the waveguide is maximally flat.
1 more element
An optical waveguide method, comprising the steps of:
- converting incident light into a single optical mode;
- and
- after guiding the converted light into a waveguide having a sufficiently large taper angle such that optical power in lower order optical modes couples into higher order optical modes, splitting power of the guided light into a plurality of powers, out outputting them,
- wherein output is performed by splitting power of the guided light into a plurality of powers to obtain substantially equal power coupling efficiencies.
1 more element
An optical waveguide device, comprising:
- a single optical mode input waveguide;
- a plurality of output waveguides;
- and
- a tapered waveguide for connecting said input waveguide and said output waveguides, gradually increasing in width from said input waveguide toward said output waveguides,
- wherein said tapered waveguide has a sufficiently large taper angle such that optical power in lower order optical modes couples into higher order optical modes while light propagates along the tapered waveguide,
- and wherein said tapered waveguide has the same refractive index as said input waveguide.
3 more elements
An optical waveguide method, comprising the steps of:
- converting incident light from an input waveguide into a single optical mode;
- and
- after guiding the converted light into a waveguide having a sufficiently large taper angle such that optical power in lower order optical modes couples into higher order optical modes, and having the same refractive index as said input waveguide, splitting power of the guided light into a plurality of powers, and outputting them.
Dependencies are inferred from the claim text.