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Published on: September 25, 2020
Mode demultiplexer using angularly multiplexed volume holograms
Yuta Wakayama1, Atsushi Okamoto, Kento Kawabata
1Graduate School of Information Science and Technology, Hokkaido University, Kita 14 Nishi 9, Sapporo 064-0814, Japan. wakayama@optnet.ist.hokudai.ac.jp
Abstract:
This study proposes a volume holographic demultiplexer (VHDM) for extracting the spatial modes excited in a multimode fiber. A unique feature of the demultiplexer is that it can separate a number of multiplexed modes output from a fiber in different directions by using multi-recorded holograms without beam splitters, which results in a simple configuration as compared with that using phase plates instead of holograms. In this study, an experiment is conducted to demonstrate the basic operations for three LP mode groups to confirm the performance of the proposed VHDM and to estimate the signal-to-crosstalk noise ratio (SNR). As a result, an SNR of greater than 20 dB is obtained.
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