Title :
Small-active-area germanium avalanche photodiode for single-mode fibre at 1.3 ¿m wavelength
Author :
Mikawa, T. ; Kaneda, Tadahiro ; Nishimoto, H. ; Motegi, Manabu ; Okushima, H.
Author_Institution :
Fujitsu Laboratories Ltd., Atsugi, Japan
Abstract :
A germanium avalanche photodiode of 30 ¿m active area diameter has been fabricated and tested. The multiplied dark current is as low as 5 nA at room temperature. A module using this diode and a spherical lens has been assembled and coupled with a single-mode fibre of core diameter 10 ¿m. The quantum efficiency of the module is 90% at 1.3 ¿m. The sensitivity is measured at 45 Mbit/s and at 1.3 ¿m. Minimum detectable powers obtained for 10¿11 error rate are ¿51.9 dBm and ¿50.7 dBm at 25°C and 50°C, respectively.
Keywords :
avalanche photodiodes; elemental semiconductors; germanium; optical communication equipment; 1.3 micron wavelength; Ge; avalanche photodiode; elemental semiconductors; error rate; multiplied dark current; optical communication equipment; quantum efficiency; receiver module; sensitivity; single-mode fibre; spherical lens;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19830309
