Abstract
Schottky barrier and oxide-restricted ridge-waveguide large optical cavity (LOC) arrays were fabricated and tested. Both evanescently coupled and diffraction-coupled array geometries were evaluated in terms of lateral and transverse mode behaviour. The array stripes were 3 μm wide, with a separation of 4.5, 6, 7.5 and 9 μm from centre to centre. Peak powers of over 2W were obtained for 11-element devices, with typical threshold currents in the range of 20–25 mA/ stripe and differential quantum efficiencies of more than 60%. Single-lobe lateral far-field patterns were obtained for evanescently coupled arrays with a centre-to-centre stripe spacing of 4.5 μm and for diffraction-coupled arrays with a centre-to-centre stripe spacing of 6 μm and with 30 μm-long diffraction regions. The transverse-mode behaviour was investigated as a function of the guiding layer width.
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