Patent ID: 9715066
Date: 2017-07-25
CPC Classifications: G02B

Claim:
1. An optical apparatus comprising: a splitter formed on a surface of a photonic transmitter chip to split light from a light source into a first path and a second path; a grating having a first side and a second side opposite the first side, wherein the grating is optically coupled with the splitter to receive light from the first path at the first side and light from the second path at the second side, wherein the grating is configured to transmit diffracted light from the first path and the second path in a direction orthogonal to the surface of the photonic transmitter chip into a single mode fiber, a multi-mode fiber, or free space; a tap waveguide formed on the surface of the photonic transmitter chip and optically coupled with the grating, wherein the tap waveguide is configured to receive a portion of light reflected from the grating; and a photodetector coupled with the tap waveguide.