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17 May 2010 Silicon-based ultra-wide discrete band conversion
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Nonlinear silicon photonics has been an immense research subject in the past several years with promising prospects of delivering chip scale signal modulation, shaping and characterization tools. In particular, broadband parametric process has been considered for applications ranging from wideband light amplifiers to signal characterization and signal shaping tools. Although underlying nonlinear effect, Kerr phenomena, in silicon has generated promising result of wavelength conversion, the success of these devices have been challenged by the presence of nonlinear losses such as two photon absorption and the two photon generated free carrier absorption. Experimental demonstrations were limited to conversion efficiencies below -10dB. Here, we present the prospect of ultra wide discrete band conversion schemes and the prospect of parametric process at mid-infrared wavelengths where nonlinear losses are not present. In particular, we explore the parametric wavelength conversion scheme at mid-wave infrared wavelength (2μm~6μm) by four-wavefixing process in silicon waveguides with new cladding materials, such as sapphire, that can provide transparency up to 6μm and facilitate phase matching condition for discrete wavelength bands as far as 60THz away from each other. Design criteria include the optimization of mode overlap integrals and dispersion engineering for an ultra-wide band signals. The particular results of wavelength conversion between 2μm bands and 5μm bands, and between 1.8μm bands and >4μm bands will be presented. Prospects of frequency band conversion in generation of new infrared signals and low noise, room temperature detection of mid-infrared signals will also be discussed.
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Ozdal Boyraz, En-Kuang Tien, and Shiming Gao "Silicon-based ultra-wide discrete band conversion", Proc. SPIE 7719, Silicon Photonics and Photonic Integrated Circuits II, 77190W (17 May 2010);

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