Design And Simulation Of Optical Switch And Add-Drop Multiplexer Based On Thermo-Optic Effect

With the rise of new technologies,such as artificial intelligence,internet of things and 5G,high-speed communication has brought the dramatic increase of network data.Nowadays it needs to improve the transmission capacity,to make the network functions more perfect and to realize high flexibility of information transmission for optical fiber communication system.By combining the advantages of optical switching and wavelength division multiplexing technology,multiple signals can be transmitted simultaneously in the same optical fiber to achieve independent switching between signals without interference,the logical processing capacity of information and the information transmission rate and capacity can be improved.By using the basic optical waveguide components such as bending waveguide,optical switch and multiplexer,an integrated optical waveguide chip with optical switching and multiplexing functions is designed.The integrated optical waveguide chip with coupling and multiplexing functions between 1.55?m and 1.3?m wavelength can improve the integration of optical devices and to reduce the maintenance cost of optical network system.The main work of this thesis includes three parts.Firstly,UV-curable adhesive(Noland Optical Adhesive,NOA)and property-tailorable polymer material(Perfluorocyclobutyl,PFCB)are selected to design Y-branch thermo-optic switch,directional coupler type thermo-optic switch and bending waveguides based on their outstanding thermo-optic characteristics.Secondly,Optimizing structure parameters for Y-branch thermo-optic switch,directional coupler type thermo-optic switch and bending waveguide,the signal transmission energy for a specific wavelength is maximized.Under low power consumption,the switch can output continuously energy or switch optical channels with low crosstalk.Thirdly,an integrated optical chip with optical path switching and multiplexing functions is obtained by combining the different modules.The overall length of the chip is 15000?m and its width is 901?m.The energy transmittance of the output terminal can reach up to 0.9314~0.9733,and the insertionloss is 0.308dB~0.117 dB.As for the Y-branch,when working temperature of the electrode increases 20 K and the working wavelength is 1.55?m,the power consumption of the switch electrode is 5.9mW,the switching time is 0.1ms,and the crosstalk is-18.32 dB.About directional coupler type thermo-optic switch,when working temperature of the electrode increases 18 K and the working wavelength is 1.55?m,the power consumption of the switch electrode is 2.3mW,the switching time is 0.17 ms,and the crosstalk is-30.96dB;When the working wavelength is 1.3 ? m and the working temperature of the electrode increases 14 K,the power consumption of the switch electrode is 2.18 mW,the switching time is 0.149 ms,and the crosstalk is-24.28 dB.By changing the power applied on electrode,the multiplexer can continuously vary its output power for 1.55?m wavelength and 1.3?m wavelength.The results show that the designed integrated optical chip meets the designing requirements of low power consumption,low crosstalk and low loss.