1.3 μm InGaAlAs/InP laser integrated with laterally tapered SSC in a reverse mesa shape

We report 1.3 mu m InGaAlAs/InP lasers integrated with laterally tapered spot size converter (SSC) in reverse mesa shape. Because the top width is significantly larger than the bottom width for the reverse mesa ridge, high quality SSCs having narrow tip width can be fabricated through conventional photolithography with a high reproductivity. The Threshold current of the fabricated 1000 mu m long SSC integrated device is 25 mA and 44 mW single facet optical power can be obtained at 300 mA current. The lateral and vertical divergence angles are as low as 8 degrees and 11 degrees, respectively. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Automated summary

The study introduces 1.3 μm InGaAlAs/InP lasers integrated with a laterally tapered spot size converter (SSC) in a reverse mesa shape. The fabricated device exhibits low lateral and vertical divergence angles of 8 degrees and 11 degrees, respectively. High quality SSCs with narrow tip width can be achieved through conventional photolithography with a high reproducibility.