多带通UWB信号光子学产生方法

摘要

基于多个不同权重与时延的doublet脉冲叠加,提出一种新的多带通超宽带( MB-UWB)信号光学产生与传输的方法。射频( RF)信号对光载波进行强度调制后,电高斯脉冲对光信号进行相位调制并利用标准单模光纤( SMF)进行传输。 SMF实现相位调制-强度调制( PM-IM)转换,产生doublet脉冲；实现多个doublet信号的时延差,产生叠加的UWB信号。通过调节RF信号源的频率可以实现UWB信号中心频率和带宽的改变；通过调节RF信号源的幅度可以实现边带抑制比的改变。仿真实现了边带抑制比大于25dB,中心频率5~8GHz,带宽2.9~3.8GHz的UWB的信号产生。%A novel method is proposed to optically generate and transmit multiband ultra-wide band ( MB-UWB) pulses based on the summation of multiple doublet pulses with different weights and proper time delays. RF signal are used to mod-ulate the amplitude of optical signals to get multi-wavelength source. The optical signal is then modulated with Gaussian pulse and fed into a section of single-mode fiber ( SMF ) . SMF can implement phase modulation to intensity modulation ( PM-IM) conversion to generate Gaussian doublet pulse, and proper time delays to sum different weights Gaussian doublet pulses. The center frequency and bandwidth of generated pulse is determined by RF frequency. The side lobe suppression is the contribution of apodization shape, which is determined by the RF modulation voltage. So it's easy and possible to tune the center frequency and bandwidth of sub-bands. MB-UWB pulses with side lobe suppression levels over 25 dB are ob-tained with central frequency from 5GHz to 8GHz and a bandwidth from 2. 9GHz to 3. 8 GHz.