Abstract
AbstractIn the optical heterodyne communication and measurement based on semiconductor lasers, selection of an arbitrary frequency within a broad gain spectral width and continuous and broadband FM operation are needed. This paper reports a theoretical study on a laser diode (LD) with a composite optical cavity using an external reflector. Using a GaAlAs LD with an adjacent plane or spherical mirror, a broadband tuning of oscillation frequency of about 8 THz (18 nm) becomes possible by variation of the external cavity length. Further, by modulation of the injection current, a continuous FM shift as large as 150 to 290 GHz is realizable which is three to five times the conventional value.
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