Patent ID: 7006722

Claim:
A waveguide type optical device including a first optical waveguide disposed on a substrate, a second optical waveguide that is disposed on the substrate and intersects the first optical waveguide, and a groove that is disposed at an intersection position of the first optical waveguide and the second optical waveguide and is for controlling optical paths of the optical waveguides, said waveguide type optical device comprising: an insert plate disposed to be insertable into the groove; means for applying a static magnetic field such that a vector product of a velocity vector of the insert plate and its magnetic field vector is nonzero; a cantilever that has electrical wiring including therein a wiring part lying in a direction perpendicular to both the velocity vector and the magnetic field vector and that supports the insert plate; and means for detecting a relative position of the insert plate to the groove by detecting a current induced in the electrical wiring.