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Focusing sub-wavelength grating couplers with low back reflections for rapid prototyping of silicon photonic circuits

Author:
Wang, Yun  Wang, Xu  Flueckiger, Jonas  Yun, Han  Shi, Wei  Bojko, Richard  Jaeger, Nicolas A. F.  Chrostowski, Lukas  


Journal:
OPTICS EXPRESS


Issue Date:
2014


Abstract(summary):

We demonstrate fully-etched fiber-waveguide grating couplers with sub-wavelength gratings showing high coupling efficiency as well as low back reflections for both transverse electric (TE) and transverse magnetic (TM) modes. The power reflection coefficients for the TE and TM modes have been significantly suppressed to -16.2 dB and -20.8 dB, respectively. Focusing grating lines have also been used to reduce the footprint of the design. Our sub-wavelength grating couplers for the TE and TM modes show respective measured insertion losses of 4.1 dB and 3.7 dB with 1-dB bandwidths of 30.6 nm (3-dB bandwidth of 52.3 nm) and 47.5 nm (3-dB bandwidth of 81.5 nm), respectively. (C)2014 Optical Society of America


Page:
20652---20662


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