Triangular-Facet Lasers Coupled by a Rectangular Optical Waveguide

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Abstract
The coupled structure of two triangular prism-shaped micro-ring cavity lasers with a rectangular optical waveguide is achieved by selective area metalorganic vapor phase epitaxy (MOVPE), and its preliminary lasing characteristics are measured by optical pumping. This coupled laser structure consists of a (111)B growth plane and perpendicular (110) sidewall facets on a (111)B GaAs substrate. By using these coupled lasers as an oscillator and a modulator, the lasing light from the oscillator can be modulated at the modulator by changing the optical pumping power of the modulator. The carrier lifetime in the active layer of the triangular laser can also be estimated with this laser configuration. The sidewall of the triangular laser covered with an AlGaAs layer exhibits a longer carrier lifetime (∼560 ps) and lower threshold (E th=8 pJ) because of the reduced surface recombination at the edge of the GaAs active layer.