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The magnitude of the relative intensity noise (RIN) of a 5 mum distributed-feedback quantum cascade laser (DFB-QCL) was compared with a conventional 1.55 mum DFB laser diode (LD). The RIN for the DFB-QCL at a frequency of 1 MHz was 157 dBm at 10 mW light output, about 5 dB higher than that of the DFB-LD, which could almost be fully explained by the semi-classical noise model. The resonant tunnelling...
Summary form only given. Vertical-cavity surface-emitting lasers (VCSELs) should play an important role in future optical data links. However, because polarization direction in conventional VCSELs is not determined, noise enhancement due to polarization switching by feedback light from optical fiber or other components becomes a serious problem. This paper presents for the first time, to our knowledge,...
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