Peak power and wavelength optimization of a double-fused LW-VCSEL

Long-wavelength vertical-cavity surface-emitting lasers (LW-VCSELs) have profound advantages over the traditional edge-emitting lasers offering improved properties with respect to mode selectivity, fiber coupling, threshold currents and integration into 2D arrays or with other electronic devices. Its commercialization is gaining momentum as the local and access network in optical communication system expands. This paper reports the optimization of the peak lasing power and peak lasing wavelength of a LW-VCSEL using a numerical-based simulator and Taguchi's orthogonal array methodology. Initially, peak lasing power increment of 96.5% was achieved at 9.51 mW with peak wavelength of 1.55956 µm. Next, we attempted to bring the peak wavelength on target to 1.55 µm. It was found that a reduction of DBR mirror thicknesses by 1.3% from its nominal values is able to produce a device with lasing powers of 11.62 mW and on-target peak wavelength of 1.55 µm.