Advantage of 1.55 mu m InGaAs/InGaAsP MQW-DFB lasers for reducing waveform degradation and dispersion penalty for 2.5 Gb/s long-span normal fiber transmission

The advantage of 1.55- mu m multiquantum-well (MQW) distributed-feedback (DFB) lasers over conventional bulk lasers for normal fiber transmission is shown by evaluating the waveform degradation and the dispersion penalty theoretically and experimentally. The dispersion penalty expected for 70-km transmission is shown to be smaller than 1 dB at 2.5 Gb/s when the bias current is 1.1 times the threshold bias.<
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