Abstract
A review of multi-wavelength gain-coupled DFB laser arrays for wavelength division multiplexing is given, with emphasis on the application of the gain-coupling mechanism and the effective index changes by varying the ridge waveguide width. Fabrication and characterization results of long-wavelength InGaAsP/InP multiquantum-well gain-coupled DFB lasers and laser arrays are presented. Features of the devices are interpreted and simulated using theoretical models. It is demonstrated that due to the gain-coupling effect, seven singlemode lasing wavelengths around 1.55 micrometers with 1 - 2 nm spacing are obtained simultaneously. Despite the significant change in the ridge width, low threshold currents and small beam divergence are achieved by careful designs. Issues regarding practical applications of the array devices are discussed.© (1995) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
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