Analysis of the linewidth of a grating-feedback GaAlAs laser

Effects of external optical feedback from a reflection grating on the linew idth of a GaAlAs semiconductor laser operating at 780 nm are investigated. Accurate linewidth measurements as a function of the laser frequency tuning have been performed by applying the self-homodyne technique with a short d elay line. A realistic coupled-cavity model, which incorporates the frequen cy-der pendent reflection from the grating, is used to explain the measured data. The agreement between the theoretical and experimental results was f ound to be good.