For Full-Text PDF, please login, if you are a member of IEICE,|
or go to Pay Per View on menu list, if you are a nonmember of IEICE.
Improvement of the Optical Gain in the Er-Doped Lithium Niobate Waveguide Optical Amplifiers
Kiyoshi KISHIOKA Tomonari KISHIMOTO Kenta KUME
IEICE TRANSACTIONS on Electronics
Publication Date: 2005/05/01
Print ISSN: 0916-8516
Type of Manuscript: PAPER
optical amplifier, Er-doped waveguide amplifier, LiNbO3 waveguide,
Full Text: PDF(861.9KB)>>
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-TiO2 clad in the LiNbO3 substrate.