Abstract
We model the non-linear gain characteristics of a Fabry-Perot semiconductor optical amplifier using a modified photon density rate equation. Good agreement is found with experimental results, with the simulation accurately reproducing all the major characteristics of the amplifier. To our knowledge, this is the first calculation using only the rate equations that accurately predicts the gain and nonlinear behavior of FPSOAs.
Highlights
Fabry-Perot semiconductor optical amplifiers (FPSOAs) have been a subject of research for more than two decades
The high coupling loss from the narrow, asymmetric gain region of edge-emitting semiconductor optical amplifiers (EESOAs) is reduced in VCSOAs by virtue of the relatively large (~10 um), circular input / output structure
The VCSOA can be modeled as a FPSOA if the front and rear mirrors are approximated as a pair of hard mirrors placed at the penetration depth of the longitudinal optical field
Summary
Fabry-Perot semiconductor optical amplifiers (FPSOAs) have been a subject of research for more than two decades. (6) is derived from the summation of the optical field and its multiple reflections inside the laser cavity This term differs from the expression in [8] by the addition of a fitting parameter ηin, and a factor of (1-R1). This factor results from the fact that in [8], the coupling term is expressed as a function of the photon number injected into the cavity. Some correction is required to account for the reality that the actual rate at which photons are added to the cavity is somewhat less than the term above, since it takes more than one roundtrip to build up the interference Such a correction is included in the fitting parameter ηin, which accounts for physical coupling loss in the optical system. These equations are applied to a VCSOA and the predictions compared to measured results
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