NDLI: Backward-wave cancellation in distributed traveling-wave photodetectors

Content Provider	IEEE Xplore Digital Library
Author	Murthy, S. Seong-Jin Kim Jung, T. Zhi-Zhi Wang Wei Hsin Itoh, T. Wu, M.C.
Copyright Year	1983
Abstract	This paper describes the design, fabrication, and measurement of backward-wave-cancelled distributed traveling-wave photodetectors. One of the fundamental issues in traveling-wave photodetectors is the generation of backward-waves, which reduces bandwidth or, in the case of matched input termination, reduces their radio-frequency (RF) efficiencies by up to 6 dB. We report a traveling-wave photodetector with multisection coplanar strip transmission lines. The reflections at the discontinuities of the transmission line cancel the backward propagating waves exactly. The bandwidth reduction due to backward-waves is eliminated without sacrificing the RF efficiency. We have demonstrated a broadband backward-wave-cancelled traveling-wave photodetector with three discrete photodiodes. The photodetector is realized in InGaAs/InGaAsP/InP material systems and operates at 1.55 /spl mu/m. A 3-dB bandwidth of 38 GHz and a linear RF output of -1 dBm at 40 GHz have been achieved. The experimental results agree very well with the theoretical calculations.
Sponsorship	IEEE Lasers and Electro-Optics Society Optical Society of America
Starting Page	3071
Ending Page	3077
Page Count	7
File Size	595133
File Format	PDF
ISSN	07338724
Volume Number	21
Issue Number	12
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-12-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Photodetectors Radio frequency Bandwidth Coplanar transmission lines Transmission line theory Fabrication Transmission line measurements Impedance matching Strips Reflection
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics

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