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Optical Nonlinear Properties and Carrier Plasma Effect at Low Carrier Density in Silicon Wire Waveguides

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7 Author(s)
Satoshi Suda ; National Institute of Advanced Industrial Science and Technology, Ibaraki, Japan ; Takeshi Ogasawara ; Yuya Shoji ; Kenji Kintaka
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Ultrafast dynamics of amplitude and phase in a silicon wire waveguide are measured by a heterodyne pump probe technique at a wavelength of 1.55 μm. We determined the two-photon absorption coefficient and nonlinear refractive index to be βTPA = 0.43 cm/GW and n2 = 2.0 × 1018 m2/W, respectively. A theoretical analysis indicates that the index change due to the carrier plasma effect is linear to the carrier density when it is low as in the case of optical injection.

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IEEE Journal of Quantum Electronics  (Volume:47 ,  Issue: 9 )