Abstract
Based on ray optics technique we have analyzed the first-order backward coupling coefficient in a laterally tapered distributed feedback (DFB) laser diode. These tapered structures are designed to realize narrow beam divergence, low threshold current and high longitudinal mode selectivity. The coupling coefficient, κ, for three different laterally tapered waveguide distributed feedback laser diodes have been studied. It has been found that without changing the grating period and the material properties, the coupling coefficient can be altered by modifying the taper profile and waveguide dimensions while satisfying the adiabatic single-mode condition.
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