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Typical light-current characteristic of QDash-based 1-mm-long AR/AR DFB lasers with . Inset: optical spectrum at (a) and at (b) .
Modulation response at of the investigated lasers.
Dependence of the relaxation frequency on .
Measured onset of coherence collapse of QDash-based 1-mm-long DFB lasers as a function of the injection current above threshold, for values of approximately equal to 1.3, 2, and 4. The dashed line represents the minimum value (−29 dB) of the return loss for isolator-free 10 Gb/s transmission, recommended by the IEEE 802.3 standard.
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