Research Of The Crosstalk Characteristics For Microring Resonator

The micro-ring resonator is a very popular research field in optoelectronic integration,many functional devices,such as dispersion compensator,optical splitter multiplexer,delay line,filter,waveguide sensor and so on,are realized by micro-ring resonator,so the micro-ring resonator is becoming more and more important in integrated optics.In this dissertation,based on the study of crosstalk characteristics of a micro-ring resonator,the crosstalk characteristics of intersymbol crosstalk,coherent crosstalk and ultra-narrow bandwidth channels interchannel crosstalk are analyzed,which provides a theoretical basis for reducing crosstalk in device design level and has extensive practical value.In this dissertation,the basic working principle of the micro-ring resonator is introduced,and the transmission characteristics of its amplitude and phase characteristic are obtained.At the resonant frequency,because the micro-ring resonator is not in the critical coupling state,and the crosstalk is introduced at the drop ports and the through ports,the crosstalk characteristics between the drop ports and the through ports of the asymmetric and symmetric micro-ring resonator are simulated.Considering the practical application system,the high speed picosecond pulse light incident to the micro-ring resonator,because the micro-ring resonator broadens the time domain of the output signal,it brings some intersymbol crosstalk,simulates and analyzes the relationship between the micro-ring structure parameters,the incident pulse parameters and the intersymbol crosstalk,and gets the scheme of reducing the intersymbol crosstalk,It is analyzed and discussed based on the frequency domain response function.In multichannel systems,due to the Non-ideal band-pass function of the frequency-domain response function of the micro-ring resonator,it makes the coherent crosstalk between the optical field leakage in the adjacent channel and the main channel,analyzes the relationship between the simulation micro-ring structure parameters,the incident pulse parameters and the coherent crosstalk,and provides the guiding significance for how to prepare the low crosstalk micro-ring resonator.In view of the higher channel crosstalk in the ultra-narrow bandwidth channel of the general micro-ring resonator,this dissertation proposes to reduce the channel crosstalk by doped erbium ions based on the micro-ring resonator.Based on the erbium ion rate equation,signal,pump optical transmission equation and micro-loop coupling theory,the active micro-ring resonator transmission characteristics are obtained.The relationship between pump power,erbium-doped concentration,micro-ring structure parameters and channel crosstalk is simulated,and the reason of reducing the Ultra narrow Bandwidth channel is analyzed based on the nonlinear effect,gain effect and reducing bandwidth of the active micro-ring resonator.Finally,the intersymbol crosstalk characteristics of the active erbium-doped ring resonator caused by high speed picosecond pulse light incident are considered.In this dissertation,based on the erbium-doped micro-ring model,the time domain of the incident Gaussian pulse is discretized and the dynamic characteristics of the active erbium-doped micro-ring resonator are analyzed,the characteristics of the output pulse changing with time are obtained,and the crosstalk between the output pulses is analyzed.The relationship between the parameters of different micro-ring resonator,the power of pump,erbium-doped concentration,pulse interval and so on,and the intersymbol crosstalk are simulated,based on the analysis of the delay characteristics of active micro-ring resonator,proposed that the existence of "singular point" of the active micro-ring caused the peak of intersymbol crosstalk.