LOW LOSS MICRORING RESONATOR DEVICE

摘要

It is disclosed a low loss micro-ring resonator device (10; 100; 10') which comprises a closed-loop resonator waveguide (2) having a first refractive index (nr), the resonator waveguide (2) defining an inner (16) and an outer region (17) by an outer curved edge (15) of the waveguide (2). The resonator waveguide is arranged on a substrate (6; 6') having a second refractive index (nb), the refractive index difference (Deltan1) between the first refractive index (nr) and the second refractive index (nb) is greater than 0.3. The device (10) also comprises an upper cladding (20) covering the inner region (16) of the resonator waveguide (2) having a third refractive index (nuc); and a lateral cladding (21) in contact with the outer curved edge (15) and extending in the outer region (17), said lateral cladding (21) having a fourth refractive index (nlc), the fourth refractive index (nlc) being lower than said third refractive index (nuc). A method for reducing propagation losses of a resonator device (10; 100;10') is also described.