Bias-free operational UTC-PD above 110 GHz and its application to high baud rate fixed-fiber communication and W-band photonic wireless communication

Toshimasa Umezawa, Atsushi Kanno, Kenichi Kashima, Atsushi Matsumoto, Kouichi Akahane, Naokatsu Yamamoto, Tetsuya Kawanishi

Research output: Contribution to journalArticle

34 Citations (Scopus)


We present the design of a bias-free uni-travelling-carrier photodiode (UTC-PD) that is operational above 110 GHz, and its application to 100-GBd fixed-fiber communication and 109-GHz carrier-photonic wireless communication for advanced optical networks. The design and analysis for bias-free operation were explained in detail using the carrier concentration in the photo-absorption layer and carrier collector layer. In the experimental results, the developed UTC-PD with back-illuminated structure exhibited a wide 3-dB bandwidth of over 110 GHz at 0 V. For fixed-fiber communications, a high-baud-rate photoreceiver based on the UTC-PD was fabricated. Eye diagrams showed clear openings at up to 107 GBd and high photo-currents of 3-7 mA at 100 GHz signal light were observed at zero-bias. Assuming photonic wireless communication using photonic power supply through optical fiber, the developed UTC-PD contributed to reducing bias feeds to the photoreceiver module. Additionally, low power consumption was achieved when using the newly developed 110 GHz InP-PHEMT amplifier with the UTC-PD.

Original languageEnglish
Article number7453120
Pages (from-to)3138-3147
Number of pages10
JournalJournal of Lightwave Technology
Issue number13
Publication statusPublished - 2016 Jul 1
Externally publishedYes



  • Bias free
  • high baud rate optical fiber communications
  • high carrier frequency photonic wireless communication
  • high gain
  • low power consumption
  • UTC-PD

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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