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Properties of loss-coupled distributed feedback laser arrays for wavelength division multiplexing systems

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10 Author(s)
Hansmann, S. ; Technologiezentrum, Deutsche Telekom AG, Darmstadt, Germany ; Dahlhof, K. ; Kempf, B.E. ; Gobel, R.
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The characteristics of loss-coupled distributed feedback (DFB) semiconductor laser arrays are investigated both theoretically and experimentally. Using simulations based on a transfer matrix method, the strong influence of the residual facet reflectivity on the singlemode yield and the statistical fluctuation of the emission wavelength for as-cleaved and AR/HR coated loss-coupled DFB lasers is pointed out and compared to purely index-coupled λ/4 phase-shifted devices. Experimental results and the fabrication techniques are given for loss-coupled 1.55 μm InGaAs/InGaAlAs/InP DFB laser arrays with four channels and integrated striped thin-film heaters, which were successfully used for fine tuning the channel spacings

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Lightwave Technology, Journal of  (Volume:15 ,  Issue: 7 )