Patent ID: 8467641

Claim:
A device for use with a first light beam, a second light beam, a third light beam and a fourth light beam, said device comprising: a first waveguide having a length and a width and being arranged to receive the first light beam, the length being larger than the width; a second waveguide parallel with said first waveguide, said second waveguide having the length and width and being arranged to receive the second light beam; a third waveguide disposed perpendicularly to and intersecting with said first waveguide and said second waveguide, said third waveguide having the length and width and being arranged to receive the third light beam; a fourth waveguide parallel with said third waveguide and disposed perpendicularly to and intersecting with said first waveguide and said second waveguide, said fourth waveguide having the length and width and being arranged to receive the fourth light beam; a first light scattering portion disposed at the intersection of said first waveguide and said third waveguide, said first light scattering portion operable to scatter light; a second light scattering portion disposed at the intersection of said second waveguide and said third waveguide, said second light scattering portion operable to scatter light; a third light scattering portion disposed at the intersection of said first waveguide and said fourth waveguide, said third light scattering portion operable to scatter light; and a fourth light scattering portion disposed at the intersection of said second waveguide and said fourth waveguide, said fourth light scattering portion operable to scatter light, wherein a dimension of the first, second, third and fourth light scattering portions increases as a distance increases down each respective one of the first, second, third and fourth waveguides.