Abstract
Efficient coupling of light from a semiconductor waveguide to an optical fiber is difficult to achieve because of the inherent differences in the spot sizes. The problem is particularly severe in the vertical dimension since the spot sizes differ by more than a factor of 5. A possible solution is to use tapered structures.1,2 However, tapers lead to increased complexity in the fabrication process. Here we propose a new structure based on a multimode, untapered mode-conversion section3 that is butt coupled to the active layer (Fig. 1). This structure can, in principle, be integrated monolithically.
© 1993 Optical Society of America
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