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Proceedings Paper

High-performance PIN photodetector at 67 GHz and beyond for radio over fiber applications
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Paper Abstract

High-performance photodetectors (PDs) for radio over fiber (RoF) applications over 60 GHz were designed and fabricated. The RF output was investigated while a high linearity was observed for two designs: a low carrier concentration InGaAs absorption layer in a PIN structure and a low carrier concentration collection layer in a unitravelling- carrier (UTC) structure. The RF output performances of both PIN and UTC structures were studied at 67 GHz and 100 GHz respectively. High photocurrent densities could be obtained from both structures (21.7 kA/cm2 in the PIN structure and 35.4 kA/cm2 in the UTC structure). The PIN structure exhibited a slightly higher current density of 1.6 times than the UTC structure. The frequency response of the UTC-PD exhibited excellent flatness up to 110 GHz, with a 3 dB bandwidth beyond 110 GHz. In addition, maximum RF output powers of +6.8 dBm at 67 GHz and -5 dBm at 100 GHz was successfully obtained. The space charge effect could be ruled out for the output linearity, but avoiding overheating in the p-contact metal had to be considered. By modifying impedance matching circuit designs, the maximum RF output power level of 3 dB can be improved.

Paper Details

Date Published: 14 March 2015
PDF: 7 pages
Proc. SPIE 9362, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications VIII, 93620T (14 March 2015); doi: 10.1117/12.2078616
Show Author Affiliations
T. Umezawa, National Institute of Information and Communications Technology (Japan)
K. Akahane, National Institute of Information and Communications Technology (Japan)
N. Yamamoto, National Institute of Information and Communications Technology (Japan)
A. Kanno, National Institute of Information and Communications Technology (Japan)
T. Kawanishi, National Institute of Information and Communications Technology (Japan)


Published in SPIE Proceedings Vol. 9362:
Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications VIII
Laurence P. Sadwick; Tianxin Yang, Editor(s)

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