The phase response of a commercial saturable absorber based on semiconductor quantum wells embedded in a resonant
cavity is investigated. The nonlinear absorption change is accompanied by a variation of the spectral phase characteristic.
Also, a nonlinear change in the refractive index of the material, induced by the modified carrier density, produces a weak
shift in the resonant wavelength of the cavity. These effects can be exploited to realize an optically-controllable phase
shifter. Simulations based on a nonlinear model are also carried out in order to investigate the effect of the various cavity
parameters and phase response of the device under different operating conditions. The results from this characterization
and numerical analysis show that such device can have the potential for practical applications in telecom systems,
including dynamic dispersion compensation, tunable nonlinear effects compensation, and nonlinear signal processing
and all-optical regeneration of phase-modulated optical signals.
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