The authors have implemented chirped distributed feedback (DFB) grating lasers with phase shifts [λ/8 , 2λ/8 and 3λ/8] distributed continuously over various axial distances, using their recently proposed method for producing bent optical waveguides. The singlemode stability of the lasers with distributed phase shifts was found to be considerably higher than for lasers with abrupt phase shifts.
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Hillmer et al. (1994) studied this question.
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