Abstract
We performed intramodal scalar optical injection using fibered highly monomode (30 dB) DFB multiquantum well semiconductor laser (@ 1550 nm). We applied a microwave current modulation at a subharmonic frequency (fm = 5 GHz) of the optical detuning (3fm) to an injected but frequency unlocked slave (i.e. containing two distinct components in its Fabry-Perot spectrum (fig. 1)). This technique has previously been used to generate optical millimeter waves at k.fm 1,2. A change (increasing and/or narrowing) of the precise 3fm peak with respect to the surrounding beat note corresponding to the two components in the unmodulated FP spectrum can be observed. The purity of this 3fm component is known to be that of the microwave generator which can be subhertzian and is resolution limited by the resolution bandwidth of our electrical spectrum analyzer (10 kHz).
© 1998 IEEE
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