Patent ID: 7062130
Filing Date: 2006-06-13
Classification: G02B

Abstract:
1. A waveguide system for propagating light signals comprising: a substrate; a first waveguide adapted to propagate a first light signal, the first waveguide having a first waveguide portion, the first waveguide portion running in a first direction on a first plane relative to the substrate; a second waveguide adapted to propagate a second light signal, the second waveguide having a second waveguide portion, the second waveguide portion running in a second direction on the first plane, the second direction being different than the first direction; and a third waveguide having a third waveguide portion, the third waveguide portion lying in a second plane, the second plane being different than the first plane, the third waveguide portion being directionally coupled with the second waveguide portion to propagate the second light signal from the second waveguide portion into the third waveguide portion, and the third waveguide having a fourth waveguide portion crossing over the first waveguide portion, the fourth waveguide portion not being substantially coupled with the first waveguide portion.