Simulated eye diagrams for a directly modulated (DM) distributed-feedback laser diode (DFB-LD) at (a) back-to-back (BTB) and (b) 10 km and a DM externally injected (EI) DFB-LD at (c) BTB and (d) 25 km. See Shams et al., pp. 122-130.
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