An optical monitor device and method are presented aimed at providing low-loss
monitoring of an optical signal confined in an optical guiding structure. An optical
resonator structure is placed spatially adjacent to the guiding structure and is
optically coupled to the guiding structure, and an optical detector is optically
coupled to the resonator structure. The coupling between these elements is such
that the coupling of light from the guiding structure to the optical resonator
is smaller then the coupling of light from the resonator to the optical detector.
