Dual-Tapered 10-mu m-Spot-Size Converter with Double Core for Coupling Polarization-Independent Silicon Rib Waveguides to Single-Mode Optical Fibers

作者：Tokushima Masatoshi^*; Kamei Akio; Horikawa Tsuyoshi

来源：Applied Physics Express, 2012, 5(2): 022202.

DOI：10.1143/APEX.5.022202

A new spot-size converter (SSC) for coupling Si rib waveguides to 10-mu m-mode-diameter single mode optical fibers was theoretically and experimentally evaluated. The core of the SSC consisted of a lateral and vertical Si inverse-taper having a rib-to-wire shape and a lateral silica normal-taper with a rib shape. The calculated coupling losses for an optimized structure were 0.65 and 0.66 dB for transverse-electric (TE) and transverse-magnetic (TM) polarizations, respectively. The losses of the fabricated SSCs were 2.7 dB (TE) and 3.0 dB (TM). The measured misalignment tolerance was +/- 1.2 mu m for an extra-loss increase of 0.25 dB.

• 出版日期2012-2