Analysis and optimum design of distributed feedback lasers using coupled-power theory

Based on coupled-power theory, the analysis and optimum design of distribut ed feedback (DFB) lasers are discussed. It is shown that the lowest thresho ld and the elimination of spatial hole burning in antireflection-coated ind ex-coupled/gain-coupled/complex-coupled DFB lasers can be achieved by prope rly choosing DFB laser parameters such as the phase shift value, variations of the grating along the cavity, etc. It is also shown that coupled-power theory is simple and provides an easy approach to analytical understanding of the physical mechanisms crucial for the optimum design of DFB lasers.