Optical-to-Wireless Carrier Frequency Down-Conversion by UTC-PD-Integrated HEMT: Dependence of Conversion Gain on UTC-PD Mesa Size

K. Nishimura, T. Hosotani, D. Nakajima, T. Suemitsu, Katsumi Iwatsuki, T. Otsuji, A. Satou

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

To realize future ultra-broadband ubiquitous, resilient 6G/7G communication networks, the seamless, transparent linkage between optical and wireless networks is required [1]. We have studied the so-called photonic double-mixing functionality of transistors as a candidate of an efficient carrier frequency down-converter [2]. Its down-conversion process consists of photomixing of an optical carrier and subcarrier signals, generating the difference-frequency beat-note of the MMW/THz data signal, and RF mixing of the beat-note MMW/THz data and LO signals, generating an IF data signal. Recently, we have developed a MMW/THz carrier frequency down-converter based on an InGaAs-channel high-electron-mobility transistor (HEMT) with the uni-traveling-carrier photodiode (UTC-PD) structure (UTC-PD-integrated HEMT, see Fig. 1(a) ), demonstrating the significant enhancement of its double-mixing conversion gain by over 34 dB from that of a standard HEMT [3]. The conversion gain of the UTC-PD-integrated HEMT depends on various material and geometrical parameters through cutoff frequencies of the UTC-PD and HEMT, photoabsorption efficiency of the UTC-PD, etc. with complicated trade-off relations, so that the comprehensive device design principles are to be developed. In this work, we studied the scaling rule of the conversion gain on UTC-PD mesa size, and experimentally revealed the conversion gain increases with decreasing the mesa size up to the diffraction limit.

Original languageEnglish
Title of host publication2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2021
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781665418768
DOIs
Publication statusPublished - 2021 Jun
Event2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2021 - Munich, Germany
Duration: 2021 Jun 212021 Jun 25

Publication series

Name2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2021

Conference

Conference2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2021
Country/TerritoryGermany
CityMunich
Period21/6/2121/6/25

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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