Highly accurate spatial mode generation using spatial cross modulation method for mode division multiplexing

Hiroki Sakuma, Atsushi Okamoto, Atsushi Shibukawa, Yuta Goto, Akihisa Tomita

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

We propose a spatial mode generation technology using spatial cross modulation (SCM) for mode division multiplexing (MDM). The most well-known method for generating arbitrary complex amplitude fields is to display an off-axis computer-generated hologram (CGH) on a spatial light modulator (SLM). However, in this method, a desired complex amplitude field is obtained with first order diffraction light. This critically lowers the light utilization efficiency. On the other hand, in the SCM, the desired complex field is provided with zeroth order diffraction light. For this reason, our technology can generate spatial modes with large light utilization efficiency in addition to high accuracy. In this study, first, a numerical simulation was performed to verify that the SCM is applicable for spatial mode generation. Next, we made a comparison from two view points of the coupling efficiency and the light utilization between our technology and the technology using an off-axis amplitude hologram as a representative complex amplitude generation method. The simulation results showed that our technology can achieve considerably high light utilization efficiency while maintaining the enough coupling efficiency comparable to the technology using an off-axis amplitude hologram. Finally, we performed an experiment on spatial modes generation using the SCM. Experimental results showed that our technology has the great potential to realize the spatial mode generation with high accuracy.

Original languageEnglish
Title of host publicationNext-Generation Optical Communication
Subtitle of host publicationComponents, Sub-Systems, and Systems V
PublisherSPIE
Volume9774
ISBN (Electronic)9781510600096
DOIs
Publication statusPublished - Jan 1 2016
Externally publishedYes
EventNext-Generation Optical Communication: Components, Sub-Systems, and Systems V - San Francisco, United States
Duration: Feb 16 2016Feb 18 2016

Other

OtherNext-Generation Optical Communication: Components, Sub-Systems, and Systems V
CountryUnited States
CitySan Francisco
Period2/16/162/18/16

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Keywords

  • computer holography
  • mode division multiplexing
  • multi-mode fiber
  • Optical fiber communication
  • random diffuser
  • spatial light modulator
  • spatial mode generation
  • wavefront encoding

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Sakuma, H., Okamoto, A., Shibukawa, A., Goto, Y., & Tomita, A. (2016). Highly accurate spatial mode generation using spatial cross modulation method for mode division multiplexing. In Next-Generation Optical Communication: Components, Sub-Systems, and Systems V (Vol. 9774). [97740K] SPIE. https://doi.org/10.1117/12.2211948