Non-Uniform Grating Effects on Time-Dependent Bistable Characteristics of QWS-DFB Semiconductor Laser Amplifiers
We describe the principle of operation of an all-optical flip-flop based on dispersive bistability in a distributed feedback semiconductor optical amplifier. Cross-phase modulation controls the photonic bandgap and Bragg resonances of the amplifier, thereby shifting the hysteresis and switching thresholds to higher or lower powers. We give the details of a simple theoretical model that is used to simulate the set and reset operations. We also experimentally investigate the dependence on set-signal power and the response to back-to-back set signals, and we apply the theoretical model to understand these experimental results. © 2001 Optical Society of America OCIS codes: 250.5980, 070.4340, 050.1950, 060.4510, 190.1450, 200.4560.