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Proceedings Paper

Modeling of waveguide PIN photodetectors for millimeter wave applications
Author(s): Jerome Van de Casteele; Joseph Harari; F. Journet; Jean-Pierre Vilcot; Didier J. Decoster
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Paper Abstract

In this paper, we present the optical behavior of waveguide PIN photodetectors for millimeter wave applications. The side illumination of these devices allows us to overcome the problem encountered with classical PIN top illuminated photodetectors, which is the compromise between high cut-off frequency and high responsivity. This is the reason why we have modeled PIN waveguide photodetectors grown on InP substrate. Our modeling is based on 3D and 2D FD Beam Propagation Method to describe the propagation of light in the photodetector and on the solution of classical semiconductor equations to describe the electrical behavior of the device. The model is applied to InP P+/GaInAs N-/InP N+ and InP P+/GaInAsP P+/GaInAs N-/GaInAsP N+/InP N+ structures. Cut-off frequencies up to 90 GHz can be obtained for very small devices, typically 12 micrometers for the device length and 5 micrometers for the rib width with 0.3 micrometers thickness of GaInAs absorbing layer, by neglecting parasitic effects due to boundary pads. This is also valid for structures with smaller ribs using a constant surface area. The external quantum efficiency of such a device is strongly dependent on the device structure (GaInAsP thickness, monomode or multimode structure), and also on the conditions of injection of light (width and position of the optical spot, angle of the optical beam with the device). A complete analysis of the quantum efficiency versus the influence of GaInAsP thickness, device length, GaInAs thickness, and optical injection has been performed. It was found that, using lens ended optical fiber, multimode waveguide structures are better devices compared to monomode ones, and can lead to quantum efficiency higher than 90%.

Paper Details

Date Published: 22 February 1995
PDF: 8 pages
Proc. SPIE 2449, Fiber Optic Network Components, (22 February 1995); doi: 10.1117/12.201993
Show Author Affiliations
Jerome Van de Casteele, Domaine Univ. et Scientifique de Villeneuve d'Ascq (France)
Joseph Harari, Domaine Univ. et Scientifique de Villeneuve d'Ascq (France)
F. Journet, Domaine Univ. et Scientifique de Villeneuve d'Ascq (France)
Jean-Pierre Vilcot, Domaine Univ. et Scientifique de Villeneuve d'Ascq (France)
Didier J. Decoster, Domaine Univ. et Scientifique de Villeneuve d'Ascq (France)


Published in SPIE Proceedings Vol. 2449:
Fiber Optic Network Components
S. Iraj Najafi; Henri Porte, Editor(s)

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