| 摘要 |
PCT No. PCT/EP91/00185 Sec. 371 Date Jul. 28, 1993 Sec. 102(e) Date Jul. 28, 1993 PCT Filed Feb. 1, 1991 PCT Pub. No. WO92/14176 PCT Pub. Date Aug. 20, 1992.In a waveguide structure with diffused rare-earth doping in a light channel arranged lithium niobate crystal surface, the rare-earth doping is arranged in an effective rare-earth doping region approximately coaxially with the light guide channel; the light guide channel is diffused directly frown the crystal surface and its expansion is laterally limited.
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