相位共轭技术对光纤中互相位调制效应的补偿研究

Compensation of cross-phase modulation in optic fiber by phase conjugation

针对两束波长不同的信号脉冲的传输情况,通过理论分析和数值计算,研究了采用频域相位共轭技术和时域相位共轭技术分别对互相位调制效应的补偿情况。结果表明:时域相位共轭技术无法补偿互相位调制引起的信号失真,频域相位共轭技术则能完全补偿。对于高斯脉冲,经频域相位共轭技术补偿的输出与输入信号脉冲完全相同;对于不同啁啾值的高斯脉冲,虽然信号脉冲中途展宽的程度不同,但最终经频域相位共轭技术补偿的输出与输入信号脉冲基本一致;对于超高斯脉冲,在前半段光纤中,虽然脉宽随着高斯指数的变大而变大,但输出脉冲与初始信号脉冲一样;对于高斯脉冲串,经频域相位共轭技术后输出端的脉冲是输入脉冲的复共轭和完全的时间反转。

We analyzed theoretically and calculated numerically the compensation between two optical pulses with different wavelength based on spectral phase conjugation（SPC）and temporal phase conjugation（TPC）.The results showed that TPC can′t compensate waveform distortion caused by XPM,while SPC can compensate waveform distortion caused by XPM.For Gaussian pulse,the output pulse from SPC system is the same as the input signal pulse.For chirped Gaussian pulse,the signal pulse broadened is different in the midway,but the output pulse from SPC system is almost the same as the input signal pulse.For super-Gaussian pulse,the broadened factor increases with the increasing of Gaussian parameter in the first half of the optical fiber,but the output pulse from SPC system is the same as the input signal pulse.For pulse train,the output signal pulse from SPC system is both the complex conjugation and temporal reversion of the input pulse.