基于电吸收调制器的超宽带信号分析

The Analysis of UWB Signal Based on the Electro-absorption Modulator

为了分析全光方法产生超宽带信号的特点,采用电吸收调制器作为核心器件搭建了一种产生超宽带信号的全光分析系统.通过对系统物理模型的理论和仿真分析发现:在中心波长附近±1nm范围内,随着波长每增加1nm,脉冲展宽时间近似为93.5ps;对四个激光器输出的信号采用不同的耦合方式分别进入电吸收调制器,在系统的输出端分别产生了半高宽度近似为39ps、最大功率谱密度为-48.6dBm/MHz的doublet脉冲和半高宽度近似为42ps、最大功率谱密度为-51.3dBm/MHz的高斯函数三阶导超宽带脉冲.

In order to analyse the characteristics of ultra-wideband signal in all- optical methods, the electroabsorbing modulator is used as the core device to build a full-optical analysis system for generating UWB signals. Through the theoretical and simulation analysis of the system physical model, it is found that： around the central wavelength ± lnm, with the wavelength of each increase of lnm, the pulse broadening time is approximately 93.5ps, and the output signal of four lasers enters into the electro- absorbing modulator separately by different coupling modes, which produces half high width approximation for 39ps, the maximum power spectral density for-48.6dBm/MHz doublet pulse and half height width approximate to 42ps, The third-order ultra-wideband pulse of Gaussian function with maximum power spectral density-51.3dBm/MHz.