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 (.DELTA.n1) 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.