Optical waveguides – With optical coupler – Particular coupling structure
Patent
1998-06-30
2000-05-02
Palmer, Phan T. H.
Optical waveguides
With optical coupler
Particular coupling structure
385 15, 385 20, 385 21, G02B 626
Patent
active
060582332
ABSTRACT:
An optical interconnection apparatus including waveguide arrays, such as grating routers and star couplers, has reduced coupling loss by reducing the width of the waveguides in the array, where they connect to the free-space region, so that they are smaller than the gaps between adjacent waveguides. The free-space region is formed by a slab whose thickness is tapered in a transition region, where it connects to the waveguide arrays, so as to essentially eliminate any mismatch loss that would otherwise be caused in an abrupt junction of the waveguide arrays with the free-space region.
REFERENCES:
patent: 5136671 (1992-08-01), Dragone
patent: 5822481 (1998-10-01), Mestric
Lucent Technologies - Inc.
Palmer Phan T. H.
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