Research Of Optical Phase Sensitive Parameter Amplification In Silicon Waveguide

Nowadays the requirement of high-bandwidth communicate systems is much higher.We look forward to a high signal rate,high bandwidth utilization network,and optical interconnects and optical communication is considered to be the future development direction of large-capacity data transfer.Optical amplifier is an important component in optical network,and amplifier noise is a key factor limiting optical communications network capacity.In recent years,phase-sensitive amplifiers become a hotspot,because of its noiseless amplification characteristics,which can effectively improve the received signal to noise ratio(SNR),improve communications efficiency and increase the bandwidth of the amplifier.In quantum communications era it can increase the photon correlation,which makes sense in quantum communication.The in-phase and quadrature components of signal get different gain in phase-sensitive amplification process,which can be used in all-optical signal processing,such as phase regeneration and signal sampling.This paper studies the optical phase-sensitive parameter amplification process in silicon-on-insulator waveguide and the main content and innovations are as follows:1.Briefly introduce the different part of silicon integrated optical circuit and their developments,the background of optical phase-sensitive amplification(PSA)as well as some significant research progress,some important nonlinear effects in silicon waveguide and the theory of light transmission.2.Using quantum theory to derive at which quantum states the noiseless amplification of a phase-sensitive parameter amplifier can be realized.Moreover,its noiseless amplification character and phase squeezing character are verified.In addition,the analytical solutions at different input condition of phase-sensitive amplification process are got in small-signal approximation.3.Investigating the influence of two-photon absorption(TPA)and free-carrier absorption(FCA)on PSA process in dispersion engineered silicon strip waveguide at the telecom wavelengths.The phase dependent gain and phase-to-phase transfer functions as well as the phase regeneration capacity of PSA are numerically analyzed.It is found that TPA and FCA will suppress the phase-sensitive extinction ratio(PER)and the efficiency of phase squeezing.Moreover,the phase regeneration capability of silicon waveguide based PSA is investigated by comparing the regenerated signal waveforms at different signal power with/without TPA and FCA.4.We use a vector PSA scheme,which can eliminate the inherent phase noise(PN)to amplitude noise(AN)conversion in conventional PSA process.A dispersion engineered silicon strip waveguide is used to investigate the vector PSA scheme at the telecom wavelengths.The phase dependent gain and phase-to-phase transfer functions as well as constellation diagram at different signal polarization states(SPSs)are numerically analyzed.It is found that the PN to AN conversion is completely suppressed when the SPS is identical to one of the pump polarization states(PPSs).Moreover,the binary phase shift keying(BPSK)signal is regenerated by the proposed vector PSA scheme and the error vector magnitude(EVM)is calculated to assess the regeneration capacity.