| Recently,with the continuous advancement of the network power strategy,the next generation optical communication network technology is developing in the direction of ultra-high speed,high frequency spectral efficiency and dynamic flexibility.As a key networking device in WDM system,arrayed waveguide grating has the ability of tuning and reconfiguration,which has become the key demand of international scientific research institutions and equipment manufacturers in technical research.As a new integrated optoelectronic material platform,lithium niobate thin film(lithium niobate on insulator,LNOI)has attracted more and more researchers’ attention for its excellent electro-optic effect and higher integration.The reconfigurable AWG wavelength division multiplexer based on LNOI platform can realize the dynamic and flexible reconfiguration of the central wavelength and channel bandwidth of the device,and meet the technical requirements of the flexible grid of optical communication network.Based on the LNOI material platform,this thesis studies and designs the reconfigurable center wavelength and bandwidth of AWG wavelength division multiplexer.The main research work of this thesis is summarized as follows:1.Firstly,LNOI ridge waveguide single-mode transmission structure is designed based on effective refractive index method and finite difference time domain simulation analysis.The design principle of realizing the reconfigurable function of AWG based on the electro-optic effect of LNOI waveguide is analyzed.The design structure of coplanar electrode LNOI ridge waveguide is proposed,and the process realizability of AWG based on LNOI waveguide is described.The main performance indexes and related calculation formulas of AWG are introduced,which provides a theoretical basis for the design and optimization of reconfigurable AWG devices in subsequent chapters.2.Aiming at the theoretical model of reconfigurable AWG wavelength division multiplexer,this thesis puts forward the design method of joint research of WDMPhasar and Opti-BPM simulation tools.Firstly,the output spectrum of the device under static characteristics and the optimized design of device structure parameters are obtained,and 1 × 48 port reconfigurable AWG wavelength division multiplexer.When the output wavelength interval of the device is 100 GHz,the main performance index parameters are obtained,including insertion loss of-3.4 dB,3 dB bandwidth of 81 GHz,0.5 dB bandwidth of 37.5 GHz,adjacent channel isolation of 20.3 dB,non adjacent channel isolation of 31.86 dB,and channel non-uniformity of less than 0.5 dB.3.Based on the overall design principle and analysis method of AWG wavelength division multiplexer,the design scheme of central wavelength and bandwidth tuning of reconfigurable AWG wavelength division multiplexer is proposed,and the central wavelength shift of 4 nm of reconfigurable AWG wavelength division multiplexer is obtained when the applied control electric field voltage is-13.88V～13.88 V.According to the bandwidth resource requirements of optical network,the bandwidth tuning electronic control areas of "side triangle" and "side trapezoid" are designed respectively,and the appropriate control voltage is optimized to obtain the corresponding degree of bandwidth broadening output spectrum of reconfigurable AWG wavelength division multiplexer at 200 GHz,400 GHz and 600 GHz wavelength intervals,The 3 dB bandwidth of the channel of the reconfigurable AWG device can be widened and tuned to the top flat output spectrum response of twice,four times or even up to six times when it is static.Finally,this thesis is summarized,and puts forward the problems that need to be further solved in the application of reconfigurable AWG wavelength division multiplexer. |
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