Abstract: An optical device comprises a semiconductor optical amplifier with an optical signal input and a current supply anode connected to an output of a current supply circuit, and a control circuit comprising a first input connected to this current supply anode and an output connected to a control input of this current supply circuit, and arranged for determining a voltage across the semiconductor optical amplifier and for authorizing the current supply circuit to supply the semiconductor optical amplifier with a current when this determined voltage becomes greater than a chosen threshold.

Abstract: An optoelectronic device includes a photodetection means arranged for converting first and second complementary optical signals into first and second complementary currents, and a processing means arranged for processing these first and second complementary currents to output at least a first output voltage. This processing means includes i) a conversion means arranged for separately converting the first and second complementary currents into first and second operating voltages, ii) a balancing means arranged for balancing phase and amplitude of the first and second operating voltages, and iii) a differential amplification means arranged for applying a subtraction function to the first and second operating voltages with balanced phase and amplitude to produce at least the first output voltage, which is proportional to the difference between the first and second operating voltages with balanced phase and amplitude.