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

T. Umezawa, K. Akahane, N. Yamamoto, A. Kanno, Tetsuya Kawanishi

研究成果: Conference contribution

3 被引用数 (Scopus)

抄録

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/cm<sup>2</sup> in the PIN structure and 35.4 kA/cm<sup>2</sup>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.

本文言語English
ホスト出版物のタイトルProceedings of SPIE - The International Society for Optical Engineering
出版社SPIE
9362
January
DOI
出版ステータスPublished - 2015
外部発表はい
イベント2015 Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications VIII Conference - San Francisco, United States
継続期間: 2015 2 102015 2 12

Other

Other2015 Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications VIII Conference
CountryUnited States
CitySan Francisco
Period15/2/1015/2/12

ASJC Scopus subject areas

  • Applied Mathematics
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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