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A new planar-structure InAlGaAs-InAlAs superlattice avalanche photodiode with a Ti-implanted guard-ring

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4 Author(s)
Watanabe, I. ; Optoelectron. Res. Labs., NEC Corp., Tsukuba, Japan ; Tsuji, M. ; Makita, K. ; Taguchi, K.

High-speed quasi-planar-structure InAlGaAs-InAlAs superlattice avalanche photodiodes (SL-APDs) have been fabricated with a newly proposed Ti-implanted guard-ring. The APDs exhibited a uniform multiplication profile at a multiplication factor of 50 with no edge-multiplication. The dark current was 2.2 μA at a multiplication factor of 10. High-speed response characteristics were confirmed with a gain-bandwidth product of 110 GHz and a high cut-off frequency of 15 GHz, even at a low multiplication factor of 1.5. These characteristics are the first demonstration of planar-structure SL-APDs for 10 Gb/s optical receivers use.

Published in:

Photonics Technology Letters, IEEE  (Volume:8 ,  Issue: 6 )