TY - GEN
T1 - Highly accurate spatial mode generation using spatial cross modulation method for mode division multiplexing
AU - Sakuma, Hiroki
AU - Okamoto, Atsushi
AU - Shibukawa, Atsushi
AU - Goto, Yuta
AU - Tomita, Akihisa
N1 - Publisher Copyright:
© 2016 COPYRIGHT SPIE.
PY - 2016
Y1 - 2016
N2 - 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.
AB - 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.
KW - Optical fiber communication
KW - computer holography
KW - mode division multiplexing
KW - multi-mode fiber
KW - random diffuser
KW - spatial light modulator
KW - spatial mode generation
KW - wavefront encoding
UR - http://www.scopus.com/inward/record.url?scp=84987704690&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84987704690&partnerID=8YFLogxK
U2 - 10.1117/12.2211948
DO - 10.1117/12.2211948
M3 - Conference contribution
AN - SCOPUS:84987704690
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Next-Generation Optical Communication
A2 - Li, Guifang
A2 - Zhou, Xiang
PB - SPIE
T2 - Next-Generation Optical Communication: Components, Sub-Systems, and Systems V
Y2 - 16 February 2016 through 18 February 2016
ER -