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Frequency modulation (FM) response of a 1.3 μm two-electrode distributed feedback laser is studied in detail. We found that by adjusting the injection current applied to the modulated section, the FM bandwidth can be increased to a value as high as 900 MHz. However, as the bandwidth increases, the FM sensitivity decreases proportionally. This behavior is described satisfactorily by below-threshold carrier rate equation and shown to be closely related to the injected carrier lifetime.
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Kuo et al. (1989) studied this question.
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