| 摘要 |
The present invention provides an optical waveguide coupler which relaxes the phase matching condition and facilitates the coupling between an optical waveguide and a resonator. The light in a multimode optical waveguide (1) is coupled directly to a microsphere resonator (2) via evanescent light. Since the size of the microsphere resonator (2) is very small, the efficiency of coupling between the microsphere resonator (2) and the multimode optical waveguide (1) is low. Therefore, under the nonresonance condition, the influence of the microsphere resonator (2) is small, and light propagation through the multimode optical waveguide (1) is not influenced. However, since the intensity of the light stored in the microsphere resonator (2) is high under the resonance condition, even if the coupling efficiency is low, the microsphere resonator (2) outputs light which has approximately the same power as that of the light in the multimode optical waveguide (1). Therefore, strong coupling condition is always satisfied, and the optical waveguide coupler functions as a filter due to the interference between the light in the multimode optical waveguide (1) and the light that has passed through the microsphere resonator (2).
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