Manuylovich Egor, Donodin Aleksandr, Turitsyn Sergei
Opt Express. 2021 Oct 25;29(22):36769-36783. doi: 10.1364/OE.437907.
Recovery of optical phases using direct intensity detection methods is an ill-posed problem and some prior information is required to regularize it. In the case of multi-mode fibers, the known structure of eigenmodes is used to recover optical field and find mode decomposition by measuring intensity distribution. Here we demonstrate numerically and experimentally a mode decomposition technique that outperforms the fastest previously published method in terms of the number of modes while showing the same decomposition speed. This technique improves signal-to-noise ratio by 10 dB for a 3-mode fiber and by 7.5 dB for a 5-mode fiber.
使用直接强度检测方法恢复光学相位是一个不适定问题，需要一些先验信息来对其进行正则化。在多模光纤的情况下，本征模的已知结构被用于通过测量强度分布来恢复光场并找到模式分解。在这里，我们通过数值和实验证明了一种模式分解技术，该技术在模式数量方面优于此前发表的最快方法，同时具有相同的分解速度。对于三模光纤，该技术将信噪比提高了10分贝；对于五模光纤，将信噪比提高了7.5分贝。
