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Scanning electron microscope image of a silicon-on-insulator rib waveguide cross section. FOX: field oxide.
Schematic pump–probe setup for SRS gain and nonlinear loss measurements. Pump: pump laser; probe: tunable probe laser; Mx: wavelength multiplexer; PC: polarization controller; ,, and : objective lenses; WG: S-shaped SOI waveguide; P: polarizer; F: optical filter; PD: photodetector; DAQ: data acquisition unit.
(a) Raman gain profile at a pump power of . A Gaussian curve (solid line) is fitted to the measurement data. (b) Measured peak Raman gain as a function of the input pump power.
Measured (symbols) and modeled (solid curve) transmitted optical intensity as a function of the input intensity for a -long waveguide. A carrier lifetime of is used in the modeling.
Transient probe signal attenuation caused by free carriers generated by a short pump pulse. Fitting to the measurement data with an exponential curve (solid line) gives a decay time constant of .
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