| 摘要 |
The invention concerns an optically active device comprising an optical waveguide core on an optical substrate (11, 15, 20) and a control element (32-33, 37, 40). The core comprises a channel (12, 17, 25, 35-36, 38-39) and at least an active layer (13, 18, 22) arranged on said channel, the refractive index of the channel and that of the active layer being higher than that of the substrate. The optical substrate (11, 15, 20) has a mobile ion concentration less than 0.01%. Advantageously, the device further comprises a covering layer (14, 19, 23) arranged on the active layer (13, 18, 22), the index of said covering layer being less than that of the active layer and of the channel. The invention also concerns a method for making said device.
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