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Noise in an optical amplifier: formulation of a new semiclassical model
IEEE Journal of Quantum Electronics
After pointing out some questionable assumptions of the standard beating theory, we formulate a new semiclassical wave theory of the noise in optical amplifiers. The theory is simple yet rigorous and uses a few quantum statements in a classical signal framework. The amplifier is modeled as a 2 2 2 port device, and the amplified spontaneous emission and associated noise are shown to be just the amplified coherent state (or vacuum state) fluctuation of the field entering the idler input. The newdoi:10.1109/3.622626 fatcat:bp7urkctj5c5deegesrp46sffa