We present a new approach for shaping light at the output of a multimode fiber by modulating the transmission matrix of the system rather than the incident light. We apply computer-controlled mechanical perturbations to the fiber and obtain a desired intensity pattern at its output resulting from the changes to its transmission matrix. Using an all-fiber apparatus, we demonstrate focusing light at the distal end of the fiber and dynamic conversion between fiber modes in the few-mode regime. Since in this approach the number of available degrees of control scales with the number of spectral channels and can thus be larger than the number of fiber modes, it potentially opens the door to simultaneous control over multiple inputs and at multiple wavelengths.

中文翻译：

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通过传输矩阵工程对多模光纤进行波前整形

我们提出了一种通过调制系统的传输矩阵而不是入射光来对多模光纤输出处的光进行整形的新方法。我们将计算机控制的机械扰动应用于光纤，并根据其传输矩阵的变化在输出处获得所需的强度模式。使用全光纤设备，我们演示了将光聚焦在光纤的远端以及在少数模式状态下光纤模式之间的动态转换。由于在这种方法中，可用控制程度的数量随光谱通道的数量而定，因此可能大于光纤模式的数量，因此有可能为同时控制多个输入和多个波长打开大门。