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Time-resolved study of Raman gain in highly confined silicon-on-insulator waveguides

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Abstract

We show time-resolved measurement of Raman gain in Silicon submicron-size planar waveguide using picosecond pump and probe pulses. A net nonlinear gain of 6 dB is obtained in a 7-mm long waveguide with 20.7-W peak pump power. We demonstrate an ultrafast all-optical switch based on the free-carrier dispersion effect in the silicon waveguide, whose transmission is enhanced by more than 13 dB due to the Raman effect.

©2004 Optical Society of America

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Figures (3)

Fig. 1.
Fig. 1. (a): Normalized probe transmission versus the relative time delay between the probe and the pump when the λpump = 1589.5 nm, λprobe = 1731.5 nm (red solid line), λpump = 1580.8 nm, λprobe = 1741.1 nm (blue dashed line), respectively. (b): Raman gain versus the relative delay of the probe, obtained from the difference between the two lines in (a).
Fig. 2.
Fig. 2. The output of the ultrafast switch measured by a 12-GHz detector. Solid line: λprobe = 1549.0 nm, λfilter = 1547.4 nm. Dashed line: λprobe = 1539.0 nm, λfilter = 1537.4 nm. Dotted line: λprobe = 1559.0 nm, λfilter = 1557.4 nm. BW = 0.9 nm is the bandwidth of the Raman spectrum.
Fig. 3.
Fig. 3. Solid line with rectangles: the transmission enhancement of the ultrafast switch due to the Raman effect versus the peak power of the pump pulse. Dashed line with triangles: FCA on the probe immediately after the pump pulse passes.

Equations (2)

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Δ ϕ ( t ) = 2 πL λ Δ n ( t ) 0 t β · [ P p ( τ ) A ] 2
Δ ω ( t ) = d dt Δ ϕ ( t ) β [ P p ( t ) A ] 2 .
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