In this letter, 3.072-Tb/s (six spatial and polarization modes × 4 wavelength-division multiplexing (WDM) ×128-Gb/s 16QAM) transmission over 30 km of few-mode fiber (FMF) is demonstrated employing a photonic integrated mode coupler based on silicon-on-insulator (SoI) technology. A 2-D top coupling solution with five small vertical grating couplers is proposed for coupling between an SoI chip and an FMF, guiding LP01and LP11modes. Push-pull and center launch configurations for exciting LP11and LP01modes, respectively, through mode-profile matching are analyzed and implemented on the SoI chip.
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Chen et al. (2013) studied this question.
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