| 摘要 |
A method, apparatus, and system for monitoring optical signals in a planar lightwave circuit ("PLC") by tapping light out of an optical transmission medium (e.g., a waveguide or optical fiber), into which a grating has been written, within 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 the plane of the optical transmission medium.
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