硅線波導(dǎo)中非線性光控光特性研究
[Abstract]:Compared with the traditional discrete optoelectronic optical processing technology, the photonic integrated chip reduces the cost and complexity of the network. As a new type of silicon-based optoelectronic material,. SOI (Silicon-on-insulator is considered to be the most promising technology to meet the needs of future communication network development. It is fully compatible with the existing silicon-based VLSI technology. Therefore, it has become the focus of the study of silicon photonics. Silicon wire waveguide is one of the important components of photonic integrated chip. Its submicron structure has a strong limiting ability to the light field and can realize the nonlinear photon information processing function. In this paper, based on the national 973 project "Ultra-fast nonlinear Optical Control Mechanism and All-optical 2R/3R Regeneration Integrated Chip", the theoretical study of four-wave mixing effect in silicon waveguide is carried out. The main work is as follows: 1. The fourth order Runge-Kutta method is used to calculate the four wave mixing coupling mode equation of guided wave in silicon wire waveguide. The dispersion characteristics and optical absorption loss (linear transmission loss, two photon absorption) of silicon wire waveguide structure under single mode propagation are analyzed. The influence of carrier absorption on the optical power of degenerate four-wave mixing is related to the linear and nonlinear terms of the total phase mismatch factor, respectively. The calculation results show that increasing the width or decreasing the height of the silicon wire waveguide will cause the dispersion curve to move downwards, and for the silicon wire waveguide with high transmission loss, increasing the pump power or decreasing the waveguide length will help to obtain the optimized output idling frequency optical power. The effects of two-photon absorption and free carrier absorption will lead to the attenuation of pump power, thus changing the nonlinear phase mismatch factor and the four-wave mixing efficiency. Considering the above factors, the width and height of silicon wire waveguide are chosen to be 500 nm and 250 nm, respectively, and the simulation results are verified by FDTD method. The mode distribution and dispersion curve are in agreement with the numerical results. 2. The characteristics of the power transfer function (PTF) of the data pumped four-wave mixing in a rectangular silicon-wire waveguide are calculated, and its saturation point, sign-passing (Mark) threshold point and space-sign (Space) threshold point are analyzed. The calculation results show that for the case of the parameter obtained in this paper, the linear transmission loss of 1. 2 ~ 2 ~ 2. 0 cm, auxiliary optical wave length of 1 500 ~ 1 580 nm, is 0.5 ~ 4 dB/cm. The 2R regenerator based on silicon-wire waveguide structure can provide an extinction ratio of about 4.5 dB, in which the effective carrier lifetime should be more than 2.5 ns.3.. The phase sensitivity characteristics of non degenerate four wave mixing parametric amplification process in silicon wire waveguide are studied. According to the input-output phase transfer curve, the parameters which can quantitatively evaluate the phase compression performance are defined, including the input-output phase jitter tolerance and phase compression efficiency, which can be used to analyze the compression performance of multiple phase states, such as signal transmission and null number. The effects of pump power, signal optical to idler power ratio, signal optical wavelength, waveguide length and loss on the phase compression performance are discussed. The results show that when the pump power is 700 mw, the optimal phase regeneration effect can be obtained when the ratio of optical to idling power is 6 dB, which can provide theoretical guidance for the related experimental research in the next step.
【學(xué)位授予單位】:電子科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:TN814
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