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Proceedings Paper

GHz modulators in the midinfrared using ultrahigh-confinement waveguides
Author(s): Lawrence C. West; Charles W. Roberts; Emil C. Piscani; Madan Dubey; Kenneth A. Jones; George F. McLane
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Paper Abstract

A high speed modulator at low voltage is created in the mid-infrared at 10 micrometers wavelengths by using field-induced absorption on otherwise forbidden intersubband transitions. The physical effects could scale to 1.5 micrometers wavelength light. This modulator is packaged into a unique 350 micrometers long ultra high confinement (UHC) waveguide for low capacitance and high speed. The modulator quantum wells are at the interface of a 2.1 micrometers thick by 3.75 micrometers wide UHC Ge waveguide and the GaAs substrate. The quantum wells have a 17% power coupling to the evanescent fields of the Ge waveguide. A connector to the UHC waveguides, with dimensions much smaller than a free space wavelength, has been developed and demonstrated using diffractive optical element arrays on the back side of the substrate and non-uniform grating couplers. Fields are applied across the modulator quantum wells via an ohmic contact to the side of the Ge waveguide on the top of the QWs. The ground is on the other side of the waveguide and lower towards the substrate. The 7 micrometers wide mesa supporting the quantum wells on the bottom of the Ge waveguide is slightly wider to accommodate a gold electrode.

Paper Details

Date Published: 10 January 1996
PDF: 10 pages
Proc. SPIE 2695, Functional Photonic and Fiber Devices, (10 January 1996); doi: 10.1117/12.229959
Show Author Affiliations
Lawrence C. West, Integrated Photonic Systems, Inc. (United States)
Charles W. Roberts, Integrated Photonic Systems, Inc. (United States)
Emil C. Piscani, Integrated Photonic Systems, Inc. (United States)
Madan Dubey, U.S. Army Research Lab. (United States)
Kenneth A. Jones, U.S. Army Research Lab. (United States)
George F. McLane, U.S. Army Research Lab. (United States)

Published in SPIE Proceedings Vol. 2695:
Functional Photonic and Fiber Devices
S. Iraj Najafi; Mario Nicola Armenise, Editor(s)

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