基于光波时空二元性理论，研究了时间透镜和光脉冲在色散介质中传输的原理，提出了一种利用光脉冲频谱包络来传输光信号的方法：利用光脉冲的频谱包络在色散介质中保持不变的原理，在发射端用基于时间透镜的全光傅里叶逆变换器件将光脉冲的频谱包络转换到时域进行表示，从而得到新的传输符号；在接收端用基于时间透镜的全光傅里叶变换器件将原始光脉冲序列恢复。该传输系统可以消除色度色散、偏振模色散、时间抖动等线性畸变对光脉冲的影响。给出了全光傅里叶变换/逆变换器件的具体实现方法和10 Gb/s-200 km无预啁啾、无任何色散补偿的传输实验，验证了该方案的正确性与可行性，为高速光纤通信提供了一种新的方案。

Experimental implementations of continuous optical time domain Fourier transformation based on time lenses and optical orthogonal frequency-division multiplexing (OFDM) system are carried out. Such a system is verified through 100-km transmission of 10-Gb/s non-return-to-zero (NRZ) intensity-modulated direct-detection (IM-DD) without any dispersion compensation. The system's bit error rate (BER) and power penalty are 10^-12 and 4 dBm, respectively.

A novel method for distortion-free optical pulse transmission is theoretically proposed and simulated, in which two time lenses formed by dispersion fibers and quadratic phase modulations are utilized. One is used as an optical inverse Fourier transformation (OIFT) device to transform the initial time-domain data to frequency-domain one at the transmitter and the other as an optical Fourier transformation (OFT) device to recover the data at the receiver. By using the unchanged spectral envelope in linear optical fiber communication, the initial data can be recovered. Through simulations, a 10\times100 Gb/s intensity-modulated direct-detection (IM-DD) dense wavelength division multiplexing (DWDM) system over 2000-km transmission without the compensation for polarization mode dispersion (PMD) and dispersion slope is achieved, which can be used to upgrade the current 10-Gb/s IM-DD system to a 100-Gb/s one directly.