M. Achtenhagen et al., IMPROVEMENT OF OPTICAL FEEDBACK IMMUNITY BY USING A DETUNED GAIN-COUPLED DFB LASER, Electronics Letters, 31(5), 1995, pp. 386-387
The Letter presents a comparison of the feedback sensitivity in a detu
ned gain-coupled (GC) DFB laser able to operate also in a Fabry-Perot
(FP) mode. The comparison leads to a very accurate measurement of the
reduction of the linewidth enhancement factor. A novel expression is p
roposed and a value close to 2.0 is found for the wavelength detuning
around 28 nm.