Compact grating coupler array for multicore fiber fabricated with DUV lithography

Using Space-Division Multiplexing (SDM) through multicore optical fibers (MCFs) can significantly increase the transmission capacity. However, compatibility with silicon photonics, a promising technology for compact, low-cost and power-efficient devices, requires integration between the two platforms. Using uniform grating couplers combined with compact tapers, two arrays-for 0° and 10°-were designed, fabricated and experimentally characterized. Simulations indicate coupling efficiencies of -4.64 dB and -3.64 dB for the 0° and 10° couplers, respectively, with bandwidths of 66.5 nm and 127.3 nm. Experimental results yielded efficiencies of - 6.8 dB for both designs, and corresponding bandwidths of 46.8 nm and 90 nm.