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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 2 mW. 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 alloptical signal processing .

All-Optical Inverted Triode Based on Cross-Gain Modulation in a Semiconductor Optical Amplifier