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The direct frequency modulation characteristics of a DFB-LD can be simply measured by means of a delayed selfhomodyne method using a single-mode fibre delay line and a single-mode fibre coupler. This measuring method has the features of simple set-up and high resolution when narrow-linewidth optical sources are used, compared to the conventional interferometric methods. Direct frequency modulation characteristics of a DFB-LD in the 1.55 μm region are measured, and the results obtained agree well with those by a Fabry-Perot interferometer.
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Ryu et al. (1986) studied this question.
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