Quantum Electronics Letters Operation of an All-Optical Bistable Device Dependent upon Incident and Transmitted Optical Power
Ralph S. Jameson, Wen-Tsern Lee
Abstract
In this letter we describe and demonstrate the optically bistable operation of an all-optical nonlinear Fabry-Perot etalon (NLFP) in which the power-dependent cavity phase shift has a contri- bution dependent upon the internal cavity power and a contribution directly dependent upon the power incident on the cavity. When the contributions have the same parity, the optically-bistable behavior is essentially the same as that seen in the now standard bistable NLFP (counterclockwise hysteresis in transmission). For opposite parity there is a range of relative strengths for which bistable operation cannot be obtained, but outside of that range bistable behavior having clockwise hysteresis in transmission is possible. We present a demonstration of this latter bistable behavior in which the NLFP was a GaAlAs laser diode amplifier driven by a similar diode laser. Low-frequency mod- ulation of the laser power by direct variation of the laser drive current produced a small shift in laser wavelength proportional to the laser power, providing the cavity phase shift term proportional to the inci- dent power, while the nonlinear refractive index of the NLFP provided the phase shift proportional to the transmitted power.