Abstract

This paper reports the planar-structure InAlGaAs-InAlAs superlattice avalanche photodiodes (SL-APDs) with a Ti-implanted guard-ring,which were developed for a compact and high-sensitivity 10-Gb/s optical receiver application. The design and fabrication of the novel concept planar-structure including the Ti-implanted guard-ring are described. The characteristics of the planar APDs are 0.36 µA dark current at a multiplication factor of 10, 67% quantum efficiency, 110-GHz gain-bandwidth (GB) product, 15-GHz top-bandwidth, and -27.2-dBm sensitivity at 10 Gb/s. The reliability was preliminary tested and the lifetime of longer than 107 h at 50°C was estimated. The dark current characteristics including its temperature dependence and the excess noise characteristics are also analyzed. All the obtained characteristics exhibit the practical availability of the planar SL-APDs in the 10-Gb/s trunk line optical receiver uses.

© 2000 IEEE

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