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We review recent progress of space division multiplexing technologies using few-mode and multi-core fibers. Heterogeneous design has been demonstrated as a key technology for dense core arrangement. Highest spatial channel density and over-100 spatial channel count were realized with a heterogeneous 36-core 3-mode fiber.
We present a free-space coherent communication link employing orbital angular momentum (OAM) multiplexing using polarization diversified 2D–3D hybrid photonic integrated circuits (PICs). The PICs support multiplexing/demultiplexing of up to 15-OAM states with dual polarizations. We characterize the hybrid device, including phase errors and crosstalk performance. Then, we use two hybrid PICs for a...
We demonstrate a mode division multiplexing (MDM) system over an 8 km conventional graded index multimode fiber (GI-MMF). Spatial light modulators (SLMs) are used to multiplex and demultiplex three linearly polarized (LP) modes (LP01, LP11a and LP11b) in two polarizations. A 6×6 sparse frequency domain equalizer (FDE) is used as the channel impulse response of the SLM-based MDM system is found to...
Space-division multiplexed (SDM) systems use multiple spatial-paths to increase the capacity carried by an optical fiber. The ability to integrate spatial-paths enables the SDM versions of components such as optical amplifiers to provide significant cost and efficiency advantages over the alternative, duplicated single-mode fiber systems.
This paper explores space division multiplexing of blue lasers for undersea applications. Experimental results will be shown for optical vortices utilizing a range of charge numbers corresponding to various Orbital Angular Momentum states.
We demonstrate the first all-electronically time division multiplexed (ETDM) transponder with a line rate exceeding 1 Tb/s (90-GBd PDM-64-QAM), using a novel 3-bit multiplexing DAC IC.
We propose a novel configuration to implement bandwidth-tunable add-drop filters using integrated contra directional grating assisted couplers with a bandwidth tunable from 8 nm to 16 nm. Measurement results of passive structures are presented and the tuning method is analyzed.
Compact space multiplexers with small footprint based on photonic integration, femtosecond laser inscription, fiber bundle and fused fiber techniques can be manufactured in mass production and packaged to assure high reliability, which are essential for the practical application of space-division multiplexing.
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