Control of Hydroxyl Group Content in Sol-Gel-Derived Sols for Waveguide Optical Matrix

Waveguide Optical Matrix 용 졸-겔 코팅졸의 OH 함량 제어

Recently, with the rapid development of the waveguide division multiplexing (WDM) systems for large capacity and flexibility of information network, the broad band 1.5$\mu\textrm{m}$ erbium-doped waveguide amplifier (EDWA) become important. The main factors affecting the performance of sol-gel-based waveguides are non-radiative relaxation channels due to rare-earth concentration quenching and to vibration of the OH groups Therefore, the sol-gel process has to be carefully controlled in order to minimize the residual OH content.