Improvement of the Optical Gain in the Er-Doped Lithium Niobate Waveguide Optical Amplifiers(Optoelectronics)

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This paper describes improvement of the gain in the Er-doped lithium niobate waveguide optical amplifiers. A new configuration is proposed, which is loaded with a high-index cladding for the purpose of realizing a larger overlap between the guided light fields and doped Er ion-concentration. It is shown by theoretical simulations and also by experiments that the clad is advantageous to shifts of the light fields toward the substrate surface, and that the overlap between the light field and Er ion-concentration becomes large. Improved optical gains are measured for a fabricated device with a thin-TiO_2 clad in the LiNbO_3 substrate.
社団法人電子情報通信学会の論文
2005-05-01