Abstract
A dual-mode laser terahertz source consisting of two in-line
distributed Bragg reflector (DBR) laser diodes (LD) is proposed. It is
less susceptible to residual reflections from facets than an in-line
dual-mode distributed feedback (DFB) LD. The characteristics of the
proposed terahertz source are theoretically investigated using a
split-step time-domain simulation. It is shown that terahertz waves of
frequencies from 385 GHz to 1725 GHz can be generated by appropriate
thermal tuning of two DBR LDs. The dual-mode DBR LD terahertz source
exhibits good spectral quality for residual facet reflectivity below 0.02,
but facet reflectivity of the in-line dual-mode DFB LD terahertz source
should be below 0.002 to provide similar spectral quality.
© 2020 Optical Society of Korea
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