The use of index-patterned Fabry-Perot lasers, where a small number of slot-like features are introduced along the laser cavity, is well established as a route to low cost, reliable single-frequency devices. We use a Fourier-transform based inverse scattering method to show how a modified choice of inverse function can deliver a significant improvement in modal threshold gain selectivity and SMSR compared to the originally proposed use of a constant inverse function for slot selection. We propose that the approach used can deliver a high yield of devices, with emission wavelength at or close to a target wavelength.
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