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14 March 2016 Design and characterization of low-loss 2D grating couplers for silicon photonics integrated circuits
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Proceedings Volume 9752, Silicon Photonics XI; 97520V (2016)
Event: SPIE OPTO, 2016, San Francisco, California, United States
We present the characterization of Silicon-on-insulator (SOI) photonic-crystal based 2D grating-couplers (2D-GCs) fabricated by CEA-Leti in the frame of the FP7 Fabulous project, which is dedicated to the realization of devices and systems for low-cost and high-performance passives-optical-networks. On the analyzed samples different test structures are present, including 2D-GC connected to another 2D-GC by different waveguides (in a Mach-Zehnder like configuration), and 2D-GC connected to two separate 2D-GCs, so as to allow a complete assessment of different parameters. Measurements were carried out using a tunable laser source operating in the extended telecom bandwidth and a fiber-based polarization controlling system at the input of device-under-test. The measured data yielded an overall fiber-to-fiber loss of 7.5 dB for the structure composed by an input 2D-GC connected to two identical 2D-GCs. This value was obtained at the peak wavelength of the grating, and the 3-dB bandwidth of the 2D-GC was assessed to be 43 nm. Assuming that the waveguide losses are negligible, so as to make a worst-case analysis, the coupling efficiency of the single 2D-GC results to be equal to -3.75 dB, constituting, to the best of our knowledge, the lowest value ever reported for a fully CMOS compatible 2D-GC. It is worth noting that both the obtained values are in good agreement with those expected by the numerical simulations performed using full 3D analysis by Lumerical FDTD-solutions.
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C. Lacava, L. Carrol, A. Bozzola, R. Marchetti, P. Minzioni, I. Cristiani, M. Fournier, S. Bernabe, D. Gerace, and L. C. Andreani "Design and characterization of low-loss 2D grating couplers for silicon photonics integrated circuits", Proc. SPIE 9752, Silicon Photonics XI, 97520V (14 March 2016);

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