Properties of loss-coupled distributed feedback laser arrays forwavelength division multiplexing systems |
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| Authors: | Hansmann S Dahlhof K Kempf BE Gobel R Kuphal E Hubner B Burkhard H Krost A Schatke K Bimberg D |
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| Affiliation: | Technologiezentrum, Deutsche Telekom AG, Darmstadt ; |
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| Abstract: | 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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