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Proceedings Paper

Uni-traveling-carrier photodiodes for high-speed detection and broadband sensing
Author(s): Hiroshi Ito; Tadao Nagatsuma; Tadao Ishibashi
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Paper Abstract

The uni-traveling-carrier photodiode (UTC-PD) is a novel photodiode that utilizes only electrons as the active carriers. This unique feature is the key to realize its excellent high-speed and high-output characteristics simultaneously. To date, a record 3-dB bandwidth (f3dB) of 310 GHz and a very high millimeter (mm)-wave output power of over 17 mW at 120 GHz have been achieved. These superior characteristics are essential for the detection of high-bit-rate optical signal in communications systems and for the generation of high-frequency electro-magnetic waves in measurement and sensing systems. For optical communications, we have realized a photoreceiver operating at up to 160 Gbit/s and an avalanche photodiode with a record f3dB of 40 GHz. For generating mm-/sub-mm-wave signals, we have developed a compact UTC-PD module with a rectangular waveguide output port for operation at up to 325 GHz. We have also fabricated a quasi-optical module for operation at higher frequencies integrating a UTC-PDs and a planar log-periodic antenna. This module can be operated at up to 1.6 THz with a maximum output-power of 2.6 μW at 1.04 THz. The UTC-PD has been used successfully for several applications, such as mm-wave imaging and photonic local signal supply for radio telescopes, demonstrating its feasibility for high-frequency measurement and sensing systems. As a challenge for future high-sensitivity sensing systems, the possibility of UTC-PD modules operating at a very low temperature of 15 K has also been demonstrated.

Paper Details

Date Published: 2 February 2007
PDF: 14 pages
Proc. SPIE 6479, Quantum Sensing and Nanophotonic Devices IV, 64790X (2 February 2007); doi: 10.1117/12.698221
Show Author Affiliations
Hiroshi Ito, NTT Corp. (Japan)
Tadao Nagatsuma, NTT Corp. (Japan)
Tadao Ishibashi, NTT Electronics Corp. (Japan)


Published in SPIE Proceedings Vol. 6479:
Quantum Sensing and Nanophotonic Devices IV
Manijeh Razeghi; Gail J. Brown, Editor(s)

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