13 February 2016 Spatial-mode conversion using random diffuser and spatial light modulator for reduction of modal crosstalk
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The mode-division multiplexing (MDM) technique enables the transmission of multiple signals within a multi-mode fiber (MMF) or a few-mode fiber (FMF). To construct an efficient and flexible MDM network in the same way as a wavelength-division multiplexing network, a mode conversion method with low modal crosstalk is required for switching between arbitrary spatial modes. However, in general, modal crosstalk is strongly dependent on the intensity pattern before mode conversion, and it is increased particularly for higher order modes. In order to reduce modal crosstalk, we propose a method using a random diffuser and a spatial light modulator (SLM). In the proposed method, firstly, the input spatial mode is dispersed uniformly by the random diffuser. Subsequently, the diffused phase distribution is canceled and converted into the desired spatial mode by the SLM, which displays phase difference between desired and diffused modes. Consequently, every spatial mode can be evenly converted into a desired mode. Here, we numerically simulate and confirm that the proposed method can reduce modal crosstalk compared to the conversion method without the random diffuser.
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Koki Ishii, Koki Ishii, Atsushi Okamoto, Atsushi Okamoto, Takehiro Tsuritani, Takehiro Tsuritani, Yuta Wakayama, Yuta Wakayama, Yuta Goto, Yuta Goto, Akihisa Tomita, Akihisa Tomita, } "Spatial-mode conversion using random diffuser and spatial light modulator for reduction of modal crosstalk", Proc. SPIE 9774, Next-Generation Optical Communication: Components, Sub-Systems, and Systems V, 97740I (13 February 2016); doi: 10.1117/12.2212700; https://doi.org/10.1117/12.2212700

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