Optical amplifier series: Introduction to Semiconductor Optical Amplifier
Optical amplifier?series: Introduction to Semiconductor Optical Amplifier
Semiconductor optical amplifier (SOA) is an optical amplifier based on semiconductor gain media. It is essentially like a fiber coupled semiconductor laser tube, with the end mirror replaced by an anti reflective film; Tilted waveguides can be used to further reduce the end reflectivity. Signal light is usually transmitted through a semiconductor single-mode waveguide, with a lateral dimension of 1-2 μ m and a length of approximately 0.5-2mm. The waveguide mode significantly overlaps with the active (amplification) region, which is pumped by current. Injecting current generates a certain carrier density in the conduction band, allowing for optical transitions from the conduction band to the valence band. The maximum gain occurs at photon energies slightly above the bandgap energy.
Working principle of semiconductor optical amplifierSemiconductor optical amplifiers(SOA)? amplify incident light signals through stimulated emission, and their mechanism is the same as that of semiconductor lasers. SOA optical amplifier is just a semiconductor laser without feedback, and its core is to obtain optical gain by reversing the number of particles when the semiconductor optical amplifier is optically or electrically pumped.
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