CAJ | 학술논문

根据非线性系统Volterra级数分析理论建立了半导体激光器的非线性模型.半导体激光器由本征激光器与寄生网络级联而成.本征激光器的非线性传递函数利用谐波输入法从速率方程得到,而寄生网络的非线性传递函数由影响其非线性的主要因素决定.在此基础上利用非线性系统的级联关系得到半导体激光器的非线性传递函数,并利用模型计算了半导体激光器的二次谐波、三次谐波和三阶交调失真.计算结果显示,在宽频范围内模型计算结果与仿真结果接近,且寄生网络对于激光器非线性的影响随频率升高而逐渐加大.通过比较Volterra模型与直接仿真之间的误差随输入信号功率的变化趋势可看出Volterra模型更加适用于分析弱非线性系统.所建立的模型有助于半导体激光器的器件表征与射频光传输系统的设计.
근거비선성계통Volterra급수분석이론건립료반도체격광기적비선성모형.반도체격광기유본정격광기여기생망락급련이성.본정격광기적비선성전체함수이용해파수입법종속솔방정득도,이기생망락적비선성전체함수유영향기비선성적주요인소결정.재차기출상이용비선성계통적급련관계득도반도체격광기적비선성전체함수,병이용모형계산료반도체격광기적이차해파、삼차해파화삼계교조실진.계산결과현시,재관빈범위내모형계산결과여방진결과접근,차기생망락대우격광기비선성적영향수빈솔승고이축점가대.통과비교Volterra모형여직접방진지간적오차수수입신호공솔적변화추세가간출Volterra모형경가괄용우분석약비선성계통.소건립적모형유조우반도체격광기적기건표정여사빈광전수계통적설계.
A nonlinear model for semiconductor lasers is presented based on the Volterra series analysis of nonlinear systems.The semiconductor lasers are composed of the cascaded network of intrinsic laser and parasitic network.The nonlinear transfer functions of the intrinsic laser are derived from the rate equations by the harmonic input method.The nonlinear transfer functions of the parasitic network are acquired by taking into account the main factors that affect the nonlinear behavior in parasitic network for the specific application.Then the total nonlinear transfer function is derived by using the cascading relationship of the nonlinear systems.The second- and third-order harmonic distortion and the third-order inter-modulation distortion are calculated and simulated.The comparison between the analysis and simulation results shows that they are matched closely in a wide frequency range.The influence of the parasitic network on the nonlinearity of the laser increases gradually with the increase of the frequency.The comparison of the error between the Volterra model and the simulation results with different input powers shows that the Volterra model is more suitable for the analysis of the weak nonlinear system.The model is useful for the device characterization and the design of radio-over-fiber (ROF) systems.