Investigation of mode demultiplexer for Laguerre-Gaussian mode multiplexing in free space

Ayano Sakamoto; Kayo Ogawa

doi:10.1117/12.2322070

18 September 2018 Investigation of mode demultiplexer for Laguerre-Gaussian mode multiplexing in free space

Ayano Sakamoto, Kayo Ogawa

Proceedings Volume 10770, Laser Communication and Propagation through the Atmosphere and Oceans VII; 1077011 (2018) https://doi.org/10.1117/12.2322070
Event: SPIE Optical Engineering + Applications, 2018, San Diego, California, United States

Abstract

With the rapid increase in communication traffic, the capacities of existing multiplexing methods have reached the limits of expandability. Therefore, the mode multiplex communication method using orbital angular momentum (OAM) has recently attracted attention as a new method. The OAM is a part of Laguerre-Gaussian (LG) beam. LG beam which possesses modes determined by the radial order n and the azimuth order m. The OAM is modes when the radial order n is equal to zero. Transmission capacity and spectral efficiency are expected great increase significantly from the combination of existing multiplexing method and mode multiplexing. In the future, a further increase in transmission capacity is expected because devices connected to the Internet are rapidly increasing with the spread of the Internet of Things. Therefore, in order to further increase transmission capacity, it is necessary to expand the radial order n. In this study, we investigate the mode multiplexing communication method using LG mode extending the radial order n. To realize mode multiplexing with increased the amount of multiplexing, technological developments in demultiplexing are particularly significant. In previous studies, mode-demultiplexers have been considered interferometric method and holographic filter. However, these methods have problems such as the complex of optical system and the reduction in diffraction efficiency. Therefore, we design the computer generated hologram that can extract multiple modes with one filter as the mode-demultiplexer. Through the above examination, we aim to realize simplification and high efficiency of the mode-demultiplexer.

Citation Download Citation

Ayano Sakamoto and Kayo Ogawa "Investigation of mode demultiplexer for Laguerre-Gaussian mode multiplexing in free space", Proc. SPIE 10770, Laser Communication and Propagation through the Atmosphere and Oceans VII, 1077011 (18 September 2018); https://doi.org/10.1117/12.2322070

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KEYWORDS

Computer generated holography

Multiplexing

Diffraction

Holograms

Demultiplexers

Free space

Algorithms

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