Kulishov Mykola, Azaña José
Opt Express. 2004 Jun 14;12(12):2699-709. doi: 10.1364/opex.12.002699.
Ultrashort pulse propagation through grating-assisted codirectional couplers (GACCs) operating in the linear regime is theoretically investigated. For this purpose, the temporal responses of uniform GACCs to ultrashort optical pulses are calculated and the effects of varying the different physical grating parameters (e.g., length and coupling strength) on these temporal responses are evaluated. We will show that the most interesting pulse reshaping operations occur typically for the "energy receptor" mode and that depending on the length and coupling strength of the uniform perturbation one can achieve very different temporal shapes at the output of the device, including triangular pulses, square temporal waveforms as well as sequences of equalized multiple pulses. Moreover, the temporal scales of the pulses generated from a GACC are generally much shorter (in more than one order of magnitude) than those that can be generated from an equivalent Bragg grating (with the same grating length).
对超短脉冲在线性区域工作的光栅辅助同向耦合器（GACC）中的传播进行了理论研究。为此，计算了均匀GACC对超短光脉冲的时间响应，并评估了改变不同物理光栅参数（如长度和耦合强度）对这些时间响应的影响。我们将表明，最有趣的脉冲整形操作通常发生在“能量接收”模式下，并且根据均匀微扰的长度和耦合强度，在器件输出端可以实现非常不同的时间形状，包括三角脉冲、方形时间波形以及均衡多脉冲序列。此外，从GACC产生的脉冲的时间尺度通常比从等效布拉格光栅（具有相同光栅长度）产生的脉冲的时间尺度短得多（超过一个数量级）。
