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Low-cost edge-emitting DFB laser arrays for DWDM communication systems implemented by bent and tilted waveguides

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2 Author(s)
Hillmer, H. ; Center for Interdisciplinary Nanostructure Sci. & Technol.-CINSaT, Univ. of Kassel, Germany ; Klepser, B.

This paper emphasizes methodology concerning variations of the emission wavelengths of edge-emitting semiconductor lasers. We present a method based on tilted distributed feedback (DFB) gratings to be used in combination with specially bent or tilted straight waveguides for the low-cost and ultraprecise definition of different wavelength channels in lasers for Dense wavelength division multiplexing (DWDM) fiberoptic communication systems. The homogeneous DFB grating field is defined using low-cost processes and is tilted with respect to a preferential direction defined by the device borders or the crystal geometry. Our method allows ultraprecise definitions of the DWDM wavelengths and is applicable index- and complex-coupled DFB gratings in both isolated lasers and arrays. Design, technological implementation, and experimental characterization of the devices is presented in this paper. Thin-film heaters are used for correcting small wavelength deviations occurring due to technologically induced tolerances.

Published in:

Quantum Electronics, IEEE Journal of  (Volume:40 ,  Issue: 10 )

Date of Publication:

Oct. 2004

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