| 摘要 |
<p>A method, apparatus, and system for monitoring optical signals in a planar lightwave circuit (“PLC”) by tapping light from an optical transmission medium (e.g., a waveguide or optical fiber), into which a grating has been written, out of a plane of the optical transmission medium and onto a photosensitive device are disclosed herein. In one embodiment, a tilted grating, with an angle greater than about 6 degrees from normal to a central axis of the optical transmission medium may be written into a waveguide in the PLC at a location at which an attribute (e.g., a wavelength or power) of an optical signal is to be measured. A portion of an optical signal may then be reflected out of a plane of the optical transmission medium, and be detected by a photodetector positioned in a second plane, distinct from the plane of the optical transmission medium.</p> |
