超宽带信号的产生及光纤传输的研究

Research of UWB pulse generation and transmission in fiber

提出了一种新的超宽带(UWB)脉冲产生的方法,并对其产生的数学原理进行了分析和实验验证。经过高斯信号调制的偏振控制器(PC)可以产生两个相位互补的相位调制信号,先通过PC调节两个正交的相位调制信号的静态相移,再经过偏振分束器(DBS)检偏后可以得到两路相位互补的高斯信号或二阶高斯信号,最后将这两路信号延时然后再经过偏振合路器(PBC)就可以分别得到一阶或三阶高斯信号。由于这3种脉冲的产生方式不同,频带宽度不同,在光纤中传输时对色散的容忍度也不一样,因此仿真分析了色散对这3种UWB信号传输特性的影响,得出了三阶高斯信号最适合UWB传输。

A novel optical uhra-wide band （UWB） pulse generator is proposed and experimentally demonstrated in this paper. Two complement phase-modulated signals will be generated at the output of the polarization modulator （PolM） ,when a Gauss signal is applied to the PoIM. After that,a Gauss signal or a second-order Gauss signal will be generated at the output of the polarization beam splitter （PBS） based on phase modulation to intensity modulation, and under different phase shifts introduced by the polariza- tion controller. The signals from PBS are inversed. So when the Gauss and second-order Gauss pulses are with relative delay to each other and then combined at the output of polarization beam combiner（PBC）, Gauss monocycle or third order Gauss signal will be generated. Since optical signals with different optical spectra would have different tolerances to fiber dispersion, the transmission performances of the three types of UWB signals are also studied.