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Coherent Transmission Direct Detection MIMO Over Short-Range Optical Interconnects and Passive Optical Networks

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2 Author(s)
Moshe Nazarathy ; Electr. Eng. Dept., Technion - Israel Inst. of Technol., Haifa ; Amos Agmon

Building on a recently introduced quadratic multiple-input multiple-output (Q-MIMO) channel model making use of quadratic forms instead of linear channel matrices, we explore diverse signaling formats over the Q-MIMO channel in the frequency flat regime, highlighting the unique characteristics of optical multimode fiber (MMF) systems versus their wireless counterparts. In particular, we treat multiple-input single-output multimode fiber systems, comparing them with single-input single-output MMF systems and obtaining insight into the possibility of efficiently coupling the output of an MMF into a single-mode fiber. We further treat vector amplitude modulation over MMF MIMO and study the receiver zero-forcing (ZF) technique for MMF MIMO transmission, deriving its performance and comparing with a recently introduced ZF beamforming technique based on preceding at the transmitter, which is shown to be superior to receiver ZF.

Published in:

Journal of Lightwave Technology  (Volume:26 ,  Issue: 14 )