Abstract
A low-loss, broadband and high fabrication tolerant optical coupler for the monolithic integration of Si3N4 and polymer waveguides is designed and experimentally demonstrated. The coupler is based on the adiabatic vertical tapering of the Si3N4 waveguides. Low-loss operation is experimentally verified at both 976 and 1460-1635nm wavelengths. Measured losses per coupler are as low as 0.12 and 0.14dB at 976 and 1550nm, respectively, and below 0.2dB at both wavelengths for lateral misalignments between the Si3N4 and polymer waveguides up to 1.0μm.
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