Abstract
An all-optical inverted triode based on cross-gain modulation was realized in an InGaAsP-InP semiconductor optical amplifier. The output power ranged from 0.1 to 3 mW when the average control power was varied from 0.01 to 0.5 mW at the input average power of 2mW. Therefore, the output-input characteristics can be changed dynamically by low control powers. The output modulation degree was retained at around 70% over a wide control power range of 0.01 - 0.1 mW. The dependence of the output modulation degree on the input signal frequency indicates that the device can be operated with an input signal frequency up to 3 GHz. Because of its characteristics, this device can become a key component in future all- optical signal processing.
