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InP-based ridge waveguide lasers for wavelength division multiplexing applications

Wavelength division multiplexed systems place stringent requirements on the absolute wavelength and wavelength spacing of the elements in laser arrays. Ridge waveguides (RW) show excellent potential for practical implementation due to their simple fabrication with relaxed fabrication tolerances, high reliability and good performance. An analysis of the fabrication tolerances for RW and buried heterostructure (BH) devices is performed, showing the advantages offered by the ridge design. The performance limitations that are common to both BH and RW devices will be discussed. Experimental results for four element distributed feedback ridge laser arrays at 1.55 micrometers will be presented as well.