Theoretical Analysis And Experimental Study On Er～(3+)/Yb～(3+) Co-doped Optical Waveguide Amplifiers

Small and integrated all-optical network is optical communication developing trend in the future. People pays more and more attention on Erbium doped waveguide amplifiers recently, because of their high gain every unit, small size, compact structure, easy integrated, and low cost. In this dissertation, we mainly researched on following parts:This dissertation reviewed the history of the development of the erbium doped waveguide amplifiers and recent progress, and introduced the type of Waveguide Amplifiers and their production technology and application.We introduced the electronic structure the energy level structure and transitions Judd-Ofelt theory of the rare-earth Er3+ ions. Using J-O theory, we calculated the oscillator strengths, Intensity parameters, the probability of transitions, the branching ratio and lifetime of erbium-ytterbium co-doped phosphate glass.We introduced the theory of Erbium-ytterbium co-doped waveguide amplifier and analyzed the impact on the gain of amplifier. Under ignoring the amplifier spontaneous emission, excited-state absorption and matrix loss, we proposed a simple and practical model for erbium-ytterbium co-doped waveguide amplifier. We put forward a method to calculate the absorptioncross-section of Er³⁺ and Yb³⁺ ions at the 980nm wavelength in the Er³⁺-Yb³⁺ co-doping system.We measured the absorption and photoluminescence spectra of the erbium-doped and erbium-ytterbium co-doped complexes. By comparing their absorption spectra and photoluminescence, we observed that the absorption intensity at the 980nm wavelength and the photoluminescence intensity at the 1540nm wavelength enhanced in the Er³⁺-Yb³⁺-doped complexes. Therefore, we chose Er³⁺-Yb³⁺-doped complexes to prepare amplifier. Compared the photoluminescence (PL) spectra of different complexes, we chose the complex ErYb(DBM)3MA which have the strongest luminescence intensity, greatest full width at half maximum(about 80nm). Then, we measured the PL spectra of complex ErYb(DBM)3MA at the different Er/Yb ratio, and compared their PL peak intensity at the wavelength of 1550nm, and observed that the strongest intensity appears at the Er/Yb ratio of ¹/3. We doped the complex ErYb(DBM)3MA with the Er/Yb ratio of¹/3 and Er³⁺ 1wt% into the polymer SU8-2005 as the matrix material for preparing the optical waveguide amplifiers. Using UV exposure and wet etching technology, we carefully researched the optimum process condition for this matrix material. In the end, we measured the gain of optical waveguide amplifier using the amplifier measurement system designed by ourselves.