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为了得到高性能的多载波光源,研究了射频信号中不同相位差对光多载波的影响.通过理论分析可得,随着相位差从90°降至0°,光多载波性能会逐渐变差,但是相位差偏与90°相差不大时,性能不会下降太多.实验中通过移相器改变相位差,使相位差为90°,45°,0°,得到循环前IQ调制器的输出光谱,并对比循环后光多载波性能.实验结果显示,相位差为90°时,循环前IQ调制器输出为较好的单边带光谱,循环后输出50条平坦稳定光多载波;相位差为45°时,光多载波质量变差;相位差为0°时,得不到光多载波.因此,射频信号相位差为90°时,光多载波的性能最佳,随着相位差变小,性能下降,但是相位差为45°时,产生的光多载波仍可应用于光通信.
In order to get a high-performance multi-carrier light source, the influence of different phase differences on optical multi-carrier in RF signals is studied.The theoretical analysis shows that the optical multi-carrier performance will gradually deteriorate as the phase difference decreases from 90 ° to 0 ° , But the phase difference and 90 ° difference is not large, the performance will not drop too much.In the experiment phase shifter to change the phase difference so that the phase difference of 90 °, 45 °, 0 °, get before the loop IQ modulator The output spectrum is compared and the optical multi-carrier performance after cycling is compared.The experimental results show that the pre-cycle IQ modulator outputs better single-sideband spectrum with 90 ° phase difference and outputs 50 flat and stable optical multi-carriers after cycling, while the phase When the difference is 45 °, the optical multi-carrier quality deteriorates, and when the phase difference is 0 °, the optical multi-carrier can not be obtained. Therefore, when the phase difference of the radio frequency signal is 90 °, the performance of the optical multi-carrier is optimal, Become smaller, the performance decreases, but when the phase difference is 45 °, the generated optical multi-carrier can still be applied to optical communications.