In this paper we report a reduction of Lorentzian linewidth for a C-band monolithic tunable digital supermode (DS) distributed Bragg reflector (DBR) laser, A prototype device containing a InGaAlAs/InP aluminium quaternary [Al(Q)] active region is compared alongside a device containing a traditionally used InGaAsP/InP phosphorus quaternary [P(Q)] active region. The DBR tuning regions and section dimensions for both devices are identical.
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Davies et al. (2011) studied this question.
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