0.98 mu m InGaAs-InGaAsP-InGaP GRIN-SCH SL-SQW lasers for coupling high optical power into single-mode fiber

Abstract

A CW optical power of 75 mW coupled into a single-mode fiber (SMF) at a driving current of 200 mA was achieved by InGaAs-InGaAsP-InGaP graded-index separate-confinement-heterostructure strained-layer single-quantum-well (GRIN-SCH Sl-SQW) ridge waveguide lasers emitting at 0.98 mu m. The GRIN-SCH profile was optimized to minimize the series resistance due to spikes at GaAs-InGaP heterointerfaces. Highly efficient coupling into a SMF with cutoff wavelength of 0.88 mu m by precisely controlling the ridge mesa width (around 2 mu m) and reducing the aspect ratio of the far-field pattern to 1.9. As a result, 0.98- mu m InGaP cladding lasers show performance comparable to the conventional AlGaAs cladding lasers.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>