N'Gom Moussa, Norris Theodore B, Michielssen Eric, Nadakuditi Raj Rao
Opt Lett. 2018 Feb 1;43(3):419-422. doi: 10.1364/OL.43.000419.
A simple imaging system, together with complex semidefinite programming, is used to generate the transmission matrix (TM) of a multimode fiber. Once the TM is acquired, we can modulate the phase of the input signal to induce strong mode interference at the fiber output. The optical design does not contain a reference arm, no internal reference signal is used, and no interferometric measurements are required. We use a phase-only spatial light modulator to shape the profile of the propagating modes, and the output intensity patterns are collected. The semidefinite program uses a convex optimization algorithm to generate the TM of the optical system using intensity only measurements. This simple, yet powerful, method can be used to compensate for modal dispersion in multimode fiber communication systems. It also yields great promise for the next generation biomedical imaging, quantum communication, and cryptography.
一个简单的成像系统与复杂的半定规划一起，用于生成多模光纤的传输矩阵（TM）。一旦获得传输矩阵，我们就可以调制输入信号的相位，以在光纤输出端产生强烈的模式干涉。该光学设计不包含参考臂，不使用内部参考信号，也不需要干涉测量。我们使用仅相位空间光调制器来塑造传播模式的轮廓，并收集输出强度图案。半定规划使用凸优化算法，仅利用强度测量来生成光学系统的传输矩阵。这种简单而强大的方法可用于补偿多模光纤通信系统中的模式色散。它还为下一代生物医学成像、量子通信和密码学带来了巨大的希望。
