Design of Ultrawide-Band, High-Sensitivity p-i-n Protodetectors

Kazutoshi KATO  Susumu HATA  Kenji KAWANO  Atsuo KOZEN  

IEICE TRANSACTIONS on Electronics   Vol.E76-C   No.2   pp.214-221
Publication Date: 1993/02/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Optical/Microwave Interaction Devices, Circuits and Systems)
Category: Optical/Microwave Devices
p-i-n photodetector,  semiconductor,  microwave,  multimode waveguide,  

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We show the design of the bandwidth and the external quantum efficiency (including the coupling efficency to a single-mode fiber) of p-i-n photodetectors. Based on their design procedures, the performance limits of both conventional surface-illuminated photodetectors and side-illuminated photodetectors are evaluated. We point out that in the ultrawide-band region, optical waveguide photodetectors have great advantages over conventional surface-illuminated photodetectors in terms of the product of the bandwidth and the external quantum efficiency. It is shown that a 100-GHz bandwidth can be achieved with little degradation of the external quantum efficiency by a multimode waveguide photodetector structure. We also present a design concept for overcoming the performance limits of solitary waveguide photodetectors by including an input tapered optical waveguide.