Mr. Junya Tanaka Profile

Junya Tanaka

at Hokkaido Univ

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Proceedings Article | 14 May 2010 Paper

Mode division multiplex communication technique based on dynamic volume hologram and phase conjugation

Atsushi Okamoto, Kazuyuki Morita, Yuta Wakayama, Junya Tanaka, Kunihiro Sato

Proceedings Volume 7716, 771627 (2010) https://doi.org/10.1117/12.854106

KEYWORDS: Multiplexing, Holograms, Volume holography, Signal detection, Multimode fibers, Phase conjugation, Telecommunications, Optical communications, Optical fibers, Beam controllers

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We propose mode division multiplex communication technique that can split a specific spatial mode in light from a spatial mode multiplexed in an optical fiber by fusion of a phase conjugation technique with spatial filtering processing by multiplexed volume holograms and random diffusers. In mode division multiplexing, the optical signal outgoing from the multimode optical fiber is in a condition that optical information of plural spatial modes is overlapped, therefore it is difficult to de-multiplex electrically after light detection. Our technique enables to split it into each mode all optically and to compensate temporal modal shift dynamically. Mode de-multiplexing is realized by multiplexed holographic arithmetic device and phase matching of a wave surface for the spatial mode orthogonal to time. Therefore, if we use indices in conventional electronic processing, a very high-speed operation equivalent to that of 10-100PFLOPS can be realized without causing any delay in light information to be transmitted. Moreover, it can realize constructions of a system that can dynamically respond to temporal mode variations and distortions with fiber transmissions by using a photorefractive medium. Separating of around 60-70% was achieved in an experiment of separating three multiplexed spatial modes by controlling a volume type dynamic reconfigurable device based on LiNbO₃. It was clarified that the separation performance improved by an appropriate random phase mask in the numerical analysis.

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