The Basic Research Of Organic Optical Waveguide Amplifier Based On Ligand Energy Transfer Mechanism

Planar optical waveguide amplifier is an important part of Dense Wavelength Division Multiplexing?DWDM?transmission systems,which can compensate and amplify various types of losses during optical transmission.It is an important component in integrated photonic devices.With ever-increasing improvement of performance requirements for planar photonic devices,Neodymium Doped Waveguide Amplifier?NDWA?and Erbium Doped Waveguide Amplifier?EDWA?,which are small in size,easy to integrate and stable in gain,have become the focus of research.Based on the intrinsic absorption of neodymium ions at 800 nm and erbium ions at 980 nm,traditional NDWA and EDWA are respectively pumped by the semiconductor laser of 808nm and 980nm to excite the rare earth ion fluorescence emission.However,this kind of pump source is bulky,costly,and unable to achieve integration.The pump power required for direct excitation of rare earth ions is large,which results in the end heating of the device and affects the stability of the device.Therefore,this paper proposes to carry out basic research on organic NDWA and EDWA with ligand energy transfer mechanism.Such waveguide amplifiers can be excited by blue LEDs that are low-cost and easy-to-integrate,which have broad market prospects.The content is as follows:1?Two kinds of PMMA films doped with neodymium complexes Nd?DBT?and Nd?DPE?were prepared.The UV-visible near-infrared absorption spectra of Nd?DBT?-PMMA films and Nd?DPE?-PMMA films were measured.The photoluminescence of the films excited by 405nm xenon lamp and LED was observed.And the absorption and emission spectra were analyzed using the Judd-Oflet theory.The results show that the fluorescence lifetime of Nd³⁺ in the Nd?DBT?-PMMA and Nd?DPE?-PMMA films are 398.36us and 679.82us,respectively.The measured lifetime is actually 3.4us and 3.8us,and quantum efficiency is 0.85%and 0.56%,respectively.2.According to the experimental spectral data,a theoretical model of organic NDWA based on transfer mechanism between ligand and Nd³⁺ion was established.The gain of Nd?DBT?-doped optical waveguide amplifier was simulated by Matlab software.Besides,the relationship between different parameters and device gain shows that the maximum theoretical gain about 3dB is obtained on a 2cm device,when the power of 405nm LED reaches 50mW.Compared with traditional 808nm direct pumping and 405nm indirect pumping,when the device generates gain,the 808nm pumping device requires 27mW of pumping power,while the 405nm pumping requires only 11mW.3?Er?TTA?₃?TPPO?₂ was synthesized and doped into PMMA polymer in order to form a film.The UV-visible near-infrared absorption spectra and photoluminescence excited by 405nm and 350nm xenon lamp of Er?TTA?₃?TPPO?₂-PMMA films were measured.The data of spectrum was analyzed using the Judd-Oflet theory.The results show that the fluorescence lifetime of Er3+in the Er?TTA?₃?TPPO?₂-PMMA film was 12.24ms.4?A theoretical model of organic EDWA based on transfer mechanism between ligand and Er3+ion was established.The gain of Er?TTA?₃?TPPO?₂-doped optical waveguide amplifier was simulated by Matlab software.And the relationship between different parameters and device gain shows that the maximum theoretical gain about 9.2dB is obtained on a 2cm device,when the power of 405nm LED reaches 25mW.Compared with traditional 980nm direct pumping and 405nm indirect pumping,when the device generates gain,the 980nm pumping device requires 21mW of pumping power,while the 405nm pumping requires only 4mW.5?The conditions for the preparation of devices by neodymium complexes and erbium complexes were investigated.The embedded-type and ridge-type optical waveguides were designed and fabricated.The device test system was built and the near-field spot of signal light at the end of the waveguide was obtained.