【摘要】 由给定的施力函数性质，导出了优化识别结构系统模态参数最优采样频率的判据，给出了相应的定理和公式。实际算例表明，频域内最优采样频率与激励的性质有关，而与系统的输出无关。更多还原

【Abstract】 The experimental research and analysis of 1.31 μm single mode channel waveguides and components fabricated by annealed proton exchanged (APE) technique in X cut,Y proagation LiNbO 3 are presented.The near field mode intensity profile of optical waveguides under various proton exchange time ( t e ) and annealed time (t a) are measured.The optical waveguide mode size matching well with singlemode fibre is obtained by measuring and comparing with that of a single mode fiber.The lowest insertion loss of fibre waveguide fibre is 3.2 dB.The low frequency modulation characteristics of M Z interferometric modulator modulator formed in APE waveguides are tested.更多还原