Patent ID: 7769259

Claim:
An optical device, comprising: a waveguide on a base, the waveguide configured to guide a light signal through a light-transmitting medium, the waveguide having a coupled portion and an uncoupled portion; an optical coupler positioned on the coupled portion of the waveguide such that the waveguide is between the optical coupler and the base, the optical coupler not being positioned on the uncoupled portion of the waveguide; the optical coupler configured such that at least a portion of the light signal enters the optical coupler from the waveguide; and a light sensor positioned on the base with the light-transmitting medium being between the light sensor and the base, the light sensor including a light-absorbing medium configured to receive at least a portion of the light signal from the optical coupler, the light-absorbing medium being different from the light-transmitting medium.