An enhancement of the side mode suppression ratio, by utilizing interdiffused quantum wells, of a X/4 shifted distributed feedback laser is demonstrated theoretically. It is found that by introducing a diffusion step along the longitudinal direction of the quantum-well active region, the suppression ratio can be improved significantly for large nL (>2.6) devices. The maxim~m power for single longitudinal mode operation is increased by more than 50 mW.
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