Coupling efficiency improvement between thickness-tapered SSC-FP-LD and horizontally tapered SSC Si waveguide

We developed a Fabry-Perot laser (FP-LD) with a Spot-Size Converter (SSC) by selective area growth and experimentally evaluated the coupling efficiency between the SSC-FP-LD and a Si waveguide with a horizontally tapered SSC. Although the addition of SSC structure in FP-LD led to the absorption loss of 0.92 dB, overall coupling efficiency was improved by 1.15 dB.