Research On The Characteristics Of Phase-sensitive Amplifier Based On Graphene-silicon-based Organic Hybrid Waveguide

Today is an era of information explosion,one of the themes of the era is"information",so people have higher and higher requirements for the transmission rate and communication capacity of information,optical communication was born under such a background.After years of development,the optical communication transmission rate is getting faster and faster,and the communication capacity is getting larger and larger,but loss and dispersion are still the problems that restrict the development of optical communication.Phase-sensitive optical parametric amplifier(PSA)can directly amplify the same-phase component of the signal and attenuate its orthogonal component.PSA solves the problem of energy loss in optical communication,compensates the dispersion and effectively improves the transmission distance of the optical signal.Phase-sensitive amplifiers can be divided into three-wave mixing(TWM)based PSA and four-wave mixing(FWM)based PSA according to their different physical processes.Among them,PSA based on FWM has been widely studied and applied because of its variety of forms and easy to observe in most media,which promotes the development of-optical communication.Silicon-based waveguides have stringent mode field limits,high nonlinear refractive index and low transmission loss,and are compatible with various new materials.So,they are the most commonly used materials in the construction of PSAs.The main work of-this paper is to demonstrate a waveguide structure with high nonlinearity and low two-photon absorption(TPA).We introduce graphene into the structure and adjust the dispersion performance of the amplifier by changing the chemical potential of graphene.Based on this structure,phase sensitive amplification is realized,and different pumping power is studied.The main contents of this paper are as follows:1.The development history of optical communication and the promotion of phase-sensitive amplifiers to the development of optical communication are reviewed.The different classifications of phase-sensitive amplification are introduced.The functions of phase-sensitive amplifiers in optical soliton communication and phase modulation of advanced modulation signals are analyzed.2.The properties of silicon-based waveguides and several common derivation structures are introduced.The influence of phase matching on phase-sensitive amplifiers is briefly analyzed.Several nonlinear effects based on third-order nonlinear polarizabilities are introduced,and the transmission equation of the light wave in the waveguide is derived.3.The management methods of material dispersion and structural dispersion in waveguides are introduced,and the dispersion equations of several commonly used materials are given.The mode field and dispersion of the silicon-based waveguide are analyzed and calculated,and the phase-sensitive amplification performance and phase regeneration capability of the SOI(Silicon-On-Insulator)waveguide are explored.4.An organic hybrid waveguide containing graphene,silicon,silicon dioxide and para-toluene sulfonate(PTS)was designed.The trend of the refractive index of graphene with wavelength under different chemical potentials was calculated.The influence of the change of refractive index of graphene on the dispersion performance of the waveguide under different chemical potentials was investigated.The effects of different structural parameters on the dispersion performance of the organic hybrid waveguide were investigated.5.We demonstrate a PSA based on the waveguide structure designed in the previous chapter,the calculated parameters are substituted into the modified nonlinear Schrodinger equation to explore the phase-sensitive amplification performance of the PSA.Under different transmission lengths,the energy conversion relationship between the signal in the waveguide and the pump is explored to obtain the coherence length of the waveguide phase matching.Under different pump powers,the gain and Output phase of the signal are investigated as the input phase changes,and the gain characteristics and phase regeneration performance of the PSA are analyzed.Then,the gain and phase regeneration performance of the PSA are explored for the large signal model and the small signal model,respectively.