Low Crosstalk

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Invention Summary: The success of silicon photonic devices depends on high integration density. However, at the sub-wavelength scale, waveguides suffer from high crosstalk. The present technology reduces crosstalk at the sub-micron scale by using a superlattice of waveguides. Within each supercell, there is a sub-array of waveguides with different propagation constants. Differences in propagation constants may be due to differences in width, length, or materials. A creative “interlacing-recombination” scheme may be used to achieve low crosstalk at half-wavelength pitch. With this design strategy, it is possible to design a superlattice comprising waveguides with widths of 330-450 nm.   Market Application: •  Photonic chips •  Optical communication devices •  Optical phased arrays (with half-wavelength pitch) •  Space division multiplexing   Advantages: •  Increased integration density •  Reduced crosstalk •  More advanced functionality of chips •  Reduced cost •  Increased wavelength resolution •  Tolerance to surface roughness