A gain-coupled distributed feedback (DFB) laser is realized using a high-density InGaAs/AlGaAs quantum wire (QWR) array formed within a finite area of 6×500 µm by electron beam lithography and one-time selective metalorganic chemical vapor deposition (MOCVD). The stable gain-coupled DFB mode is confirmed at 812 and 830 nm from the 360 and 370 nm pitch gratings, respectively. The mode analysis of the actual cross-sectional structure using a finite element method verified that modal gain has a single peak at the Bragg wavelength of the grating.
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Takasuka et al. (2004) studied this question.
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